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CN102632447B - Machining method of target surface - Google Patents

Machining method of target surface Download PDF

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Publication number
CN102632447B
CN102632447B CN201110037143.6A CN201110037143A CN102632447B CN 102632447 B CN102632447 B CN 102632447B CN 201110037143 A CN201110037143 A CN 201110037143A CN 102632447 B CN102632447 B CN 102632447B
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polishing
grinding
target material
material surface
target
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CN102632447A (en
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朱晓光
郭力山
杨永刚
何金江
丁照崇
王欣平
吕保国
江轩
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Youyan Yijin New Material Co., Ltd.
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YOUYAN YIJIN NEW MATERIAL CO Ltd
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Abstract

The invention discloses a machining method of a target surface, which belongs to the technical field of the machining process of the target surface. The method utilizes mechanical grinding and polishing equipment to machine. The invention provides equipment conditions for machining a target. A parallel roller shaft with an adjustable opening width is used, and water sand paper or cloth with the granularity of 20-2000 meshes covers the roller shaft; the water sand paper which is from the rough to the fine is firstly utilized and then the cloth is used; and meanwhile, de-ionized water is used for lubricating to grind and polish a metal material. After the grinding and the polishing, the high-pressure de-ionized water is used for washing the surface. In the specific application, the metal material comprises one or more of nickel, copper, silver, titanium, aluminum and vanadium. The machining method has advantages of no requirements on the target surface, fast grinding and polishing speed, no need of using cutting liquid and lubricating liquid for mechanically machining, no chemical reaction on the surface, thin stress layer, high whole uniformity, and no deformation of the whole body. The machining method of the target surface is a simple, reliable, economical and efficient machining method which is adapted to the target with a large area, a great length and a large thickness ratio.

Description

A kind of processing method of target material surface
Technical field
The invention belongs to target material surface processing method technical field, relate to a kind of processing method of target material surface, the method uses Mechanical polishing equipment to carry out Surface Machining, and the method can be used for such as preparing sputtered target material (i.e. physical vapor deposition target material material, in this article " physical vapour deposition (PVD) " and " sputtering " commutative use).In a particular application, sputtered target material can comprise nickel, copper, silver, titanium, aluminium, vanadium one or more.Described sputtered target material can be called as " target material " hereinafter.
Background technology
Sputtered film material, in the related industries such as electronic information, stored record and display, has and applies extremely widely.Meanwhile, sputtering target material also increases year by year along with the growth requirement amount of these industries.The quality of target is to the performance important of sputtered film, especially the preparation of semiconductor integrated circuit chip is towards future development in large size (8,12 even 18 inches), the size of sputtering target material and sputtering power also will increase thereupon, also more and more higher to the processing request of sputtering target material.The process technology of large-area target has become key technology prepared by target material assembly.
The quality of the film formed on silicon chip by sputtering method can be subject to the impact for the target material surface sputtered.The impact of target material surface comprises stressor layers and roughness.
There is one deck stressor layers in target material surface, stressor layers and target interior tissue different.When sputtering, need to carry out pre-sputtering (burn in) to target, object is impurity and the defect such as oxide, stressor layers in order to remove target material surface, ensures that target can the normally starting the arc sputtering.
Stressor layers is thicker, then the time of pre-sputtering is longer, and efficiency is lower, and the possibility had an impact to sputter procedure is larger.
The roughness of target material surface also can have an impact to sputtering.When size exceed the out-of-flatness of certain level or projection be present in target surperficial time, paradoxical discharge can be produced in projection.Described paradoxical discharge can cause bulky grain sputter from target material surface and be deposited on silicon chip.The bulky grain of deposition can form spot and cause the short circuit of semiconductive thin film circuit on film.
The roughness of target material surface directly affects sputtering effect, and target material surface roughness is larger, and the possibility that paradoxical discharge occurs is larger, and target material surface roughness is less, and the possibility that paradoxical discharge occurs is less.Therefore, the possibility of paradoxical discharge can be reduced by reducing target material surface roughness, the film that the film quality of the target of higher roughness is higher can be formed thus.
Many materials can be used as the material of sputtering target material, comprise the simple metal materials such as such as nickel, copper, silver, titanium, aluminium.In a particular application, target material can comprise alloy or other metal alloys.
The conventional processing method of target material surface comprises: the process equipment such as lathe, planer, milling machine, grinding machine, buffing is processed.The roughness of lathe, planer, milling machine processing metallic can reach Ra 1.0 μm, and the roughness that grinding machine processes is higher, can reach Ra 0.3 μm.But for length and the very large thin plate, particularly hardness of thickness proportion and all very low simple metal thin plate of intensity, conventional method cannot be installed to workpiece to be machined.Being installed of lathe, planer, milling machine is all that use three to four claws fix workpiece to be machined, and for the thin plate that is installed, the claw of these equipment all can cause the problem making workpiece deformation.The ferrimagnet if use grinding machine is installed, the method that electromagnetism holds can be used, but for thin plate, the frictional force that the emery wheel of diamond or white fused alumina contacts with workpiece to be machined is excessive, the damage of workpiece can be caused, if processing nonferromugnetic material, the surrounding can only pushing down workpiece to be machined carries out mill processing, do not reach again the effect of whole workpiece surface roughness uniformity, further, if use grinding machine to be not suitable for processing the material partially glued as character such as aluminium, nickel, titaniums, otherwise, wheel face can be stuck with paste, cause emery wheel to scrap.The precision that buffing can make surface reach very high, but buffing is only applicable to fine finishining, target material surface flatness and the initial fineness of target are had high requirements, if surface slightly out-of-flatness, surface have granule to exist or initial roughness can not reach requirement, then not only waste time and energy, waste polishing material, and the homogeneous requirement of required surfacing cannot be reached.
Meanwhile, when using conventional machine-tooled method to process target material surface, need cutting fluid, lubricating fluid to carry out cooling, lubricating, can not ensure that all lubricating fluids do not have chemical reaction to target material surface.
In order to carry out the Surface Machining of large area, large length and the sputtering target material of thickness proportion, crucial problem is being installed of target after solving roughing, ensure target material surface processing after even, prevent target distortion, improve working (machining) efficiency, the problem such as prevent that surface from being polluted.
Therefore accordingly, needing exploitation one to be suitable for preparing a kind of grinding and polishing power should be not excessive, and be suitable for that processing length and thickness proportion are comparatively large, the Apparatus and method for of the target of thinner thickness, solve traditional diamond-making technique and can not process that this kind of length and thickness proportion are comparatively large, the problem of the target of the inclined viscosity of thinner thickness, character, and surface should not produce chemical reaction.
Summary of the invention
The present invention is in order to solve deficiency of the prior art, the invention provides a kind of processing method of target material surface, the method uses Mechanical polishing equipment, polishing processing is carried out to the surface of sheet metal, particularly comprises length and Thickness Ratio is higher, the application of the surperficial grinding and polishing of the metal sputtering target of thinner thickness.It can realize using conventional grinding and polishing material, reach and finished product processing is carried out to large area, large length and thickness proportion, thin metal sputtering target surface, metal sputtering target can be prevented to be out of shape simultaneously, prevent sputtering target material surface be subject to impurity and particle studded, avoid surface to produce the pollutions such as chemical change, enhance productivity, reduce production cost.
Technical scheme of the present invention is as follows:
A processing method for target material surface, the method uses Mechanical polishing equipment to carry out the target of the large length thickness proportion of Surface Machining, comprises the steps:
1) processed target material surface is through mechanical roughing, and mechanical roughing comprises Vehicle Processing, Milling Machining, mill processing, plane processing, and the surface roughness Ra after roughing is at 1.0 ~ 20 μm.
2) adopt Mechanical polishing equipment to carry out grinding and polishing to target material surface, wherein said Mechanical polishing equipment has two parallel roll shafts, and two parallel roll shafts can move in parallel up and down, described parallel roll shaft adjustable A/F, and A/F is between 1mm ~ 50mm;
3) on the parallel roll shaft of Mechanical polishing equipment, abrasive band or cloth is wrapped up, and drive abrasive band or cloth to rotate by the rotation of roll shaft, grinding and polishing target material surface, the relative motion of abrasive band or cloth and target material surface is utilized to carry out grinding and polishing to target, deionized water is used to carry out rinsing, lubricating in grinding and polishing process, the rotational line speed of the abrasive band that parallel roll shaft wraps up or cloth should be not less than 4m/s, and the roll shaft even angle rate of Mechanical polishing equipment rotates, to make speed even;
4) abrasive band on Mechanical polishing equipment, according to surface requirements, is changed abrasive band according to order from coarse to fine, is carried out grinding and polishing successively, grinding and polishing target material surface can be repeatedly, the abrasive band that parallel roll shaft wraps up, granularity is from 20 orders to 2000 orders, and described cloth is canvas, velvet or cloth Buddhist nun;
5) target material surface after grinding and polishing carries out high pressure de-ionized water rinse surface, and the surface requirements after flushing is without particle and impurity attachment.
Method of the present invention is applicable to metal targets, and described metal targets material comprises pure metallic nickel, copper, silver, titanium, aluminium, vanadium, and the alloy of two or more metal above-mentioned.
Described Mechanical polishing equipment processes the roughness that the target material surface obtained has Ra 0.3 ~ 1.0 μm.
The feature of this method is as follows:
1, target material surface adopts abrasive band and target relative motion and friction, and drop to minimum by the stressor layers on surface, stress drops to minimum.
2, target is without the need to being installed, and compared with conventional machining, substantially there is not distortion, is specially adapted to large area shape, and length and the larger thin plate target of thickness proportion.
3, target adopts overall grinding and polishing, and compared with taking turns grinding and polishing with cloth, overall uniformity, working (machining) efficiency are all improved largely, and requires much lower to initial roughness.
4, target grinding and polishing process uses waterproof abrasive paper, compared with processing, without the need to using cutting fluid, lubricating fluid, avoiding target material surface and producing chemical reaction, without the need to subsequent treatment with conventional mechanical.
5, use high pressure de-ionized water rinse after target grinding and polishing, ensure surface no-pollution further, without particle residue.
Compared with existing method of surface finish, the present invention requires low to target material surface, grinding and polishing speed is fast, the cutting fluid used without the need to using machined, lubricating fluid, surface is without chemical reaction, and stressor layers is thin, and overall uniformity is high, overall without distortion, be a kind of simple, reliable, economic, processing method of being applicable to large area, large length and thickness proportion target efficiently.
Detailed description of the invention
Below, the processing of sputtering target material of the present invention is illustrated.
So far, in industrial production, target is carried out to the means of Surface Machining, mainly contain the process equipments such as lathe, planer, milling machine, grinding machine.Roughness generally can reach Ra about 1.0 μm, and grinding machine can reach about Ra0.3 μm.But for the metal material that length thickness ratio is higher, except using grinding machine, also there is no effective manufacturing process at present.And especially for the material that nature relatively glues, as nickel, aluminium, titanium etc., grinding machine is then inapplicable.And said method all needs to use cutting fluid to carry out Cooling and Lubricator, can not ensure that target material surface does not have chemical reaction.And the target of cloth wheel grinding and polishing to thicker surface quality needs long-time grinding and polishing, easily produce stressor layers, expend grinding and polishing material, inefficiency.
The present inventor person, in order to improve the roughness on sputtering target material surface, improve working (machining) efficiency, prevent target to be out of shape, prevent target material surface from polluting, the thin plate target that especially length thickness ratio is larger, has carried out contrast test.By contrast test, the present invention is described in more detail.
Embodiment 1
Two pieces are processed into diameter through engine lathe is 400mm, and thickness is the pure nickel target blank of 3.3mm, continues respectively to use engine lathe to carry out Surface Machining and equipment of the present invention carries out Surface Machining.
Use engine lathe to add man-hour, engine lathe uses diamond tool, rotating speed 250r/min, depth of cut 0.1mm.By cylindrical, centripetal portion machines.
After completion of processing, nickel target is taken off from lathe claw.Find due to machining stress, target heart portion and external diameter are standing shape, have occurred distortion.
Use method of the present invention to carry out grinding and polishing to nickel target base, comprise the steps:
1) processed target blank surface is through lathe roughing, and the surface roughness Ra after roughing is 1.7 μm.
2) use Mechanical polishing equipment to have two parallel roll shafts can move in parallel up and down, adjustable A/F, A/F is 3mm;
3) the parallel roll shaft of Mechanical polishing equipment wraps up waterproof abrasive paper abrasive band, and drives abrasive band to rotate by the rotation of roll shaft, grinding and polishing target material surface, grinding and polishing process uses deionized water to carry out rinsing, lubricating, and abrasive band rotational line speed is 4m/s, and speed is even;
4) abrasive band on Mechanical polishing equipment adopts diamond waterproof abrasive paper 200 order grinding and polishing 4 times successively, then is replaced by 800 order abrasive band grinding and polishing 4 times, then is replaced by 1200 order abrasive band grinding and polishing 4 times;
5) target after the grinding and polishing of abrasive band, re-uses Ni Bu and carries out surperficial grinding and polishing, roll shaft wraps up Buddhist nun's cloth, roll shaft opening degree 3mm, Buddhist nun's cloth rotational line speed 7m/s that roll shaft wraps up, and uses deionized water rinsing and lubrication simultaneously, altogether grinding and polishing 8 times;
6) target material surface after grinding and polishing carries out high pressure de-ionized water rinse surface, and the surface after flushing, through range estimation, requires without particle and impurity attachment.
Do not find distortion through inspection after completion of processing, dimensional thickness is 3.1mm.Roughness Ra is 0.7 μm.
Embodiment 2
Two pieces is 800mm through planer roughing length, and width is 100mm, and thickness is the pure titanium target blank of 8.4mm, uses planer and grinding and polishing equipment of the present invention processing respectively.
Use the pure titanium target blank of planer processing, roughness Ra is 5.5 μm.
Use Mechanical polishing equipment to carry out the target of the large length thickness proportion of Surface Machining, comprise the steps:
1) processed target material surface is through planer roughing, and the surface roughness Ra after roughing is 5.5 μm.
2) Mechanical polishing equipment is used to adjust parallel roll shaft A/F to 8mm;
3) the parallel roll shaft of Mechanical polishing equipment wraps up waterproof abrasive paper abrasive band, and drive abrasive band and cloth to rotate by the rotation of roll shaft, grinding and polishing target material surface, use deionized water to carry out rinsing, lubricating simultaneously, abrasive band and target material surface are relative motions, the rotational line speed in abrasive band is 10m/s, and speed is even;
4) abrasive band on Mechanical polishing equipment adopts 400 order grinding and polishing 4 times, 800 order grinding and polishing 8 times, 1200 order grinding and polishing 8 times successively;
5) target after the grinding and polishing of abrasive band, re-uses Ni Bu and carries out surperficial grinding and polishing, roll shaft wraps up Buddhist nun's cloth, roll shaft opening degree 5mm, Buddhist nun's cloth rotational line speed 10m/s that roll shaft wraps up, and uses deionized water rinsing and lubrication simultaneously, altogether grinding and polishing 8 times;
6) target after grinding and polishing carries out high pressure de-ionized water rinse surface, and the surface requirements after flushing is without particle and impurity attachment.
According to method of the present invention, according to said process, the roughness Ra of target material surface is 0.4 μm, does not find distortion.
Embodiment 3
Two block lengths are 100mm, and width is 100mm, and thickness is the fine copper target blank of 5.5mm.Use planer and grinding and polishing equipment of the present invention processing respectively.
Use the fine copper target blank of planer processing, roughness Ra is 6.3 μm.
Use Mechanical polishing equipment to carry out the target of Surface Machining, comprise the steps:
1) through planer rough machined copper target blank surface roughness Ra be 6.3 μm;
2) adjust two parallel roll shafts of Mechanical polishing equipment, A/F is 5mm;
3) parallel roll shaft wraps up waterproof abrasive paper abrasive band, and drive abrasive band and cloth to rotate by the rotation of roll shaft, grinding and polishing target material surface, use deionized water to carry out rinsing, lubricating, the rotational line speed in abrasive band is 7m/s, and speed is even simultaneously;
4) abrasive band on Mechanical polishing equipment adopts 80 order grinding and polishing 4 times, 180 order 4 times, 800 order grinding and polishing 6 times, 1200 order grinding and polishing 8 times successively;
5) target after the grinding and polishing of abrasive band, re-uses velvet and carries out surperficial grinding and polishing, roll shaft wraps up velvet, roll shaft opening degree 5mm, the velvet rotational line speed 7m/s that roll shaft wraps up, and uses deionized water rinsing and lubrication simultaneously, altogether grinding and polishing 8 times;
6) target material surface after grinding and polishing carries out high pressure de-ionized water rinse surface, and the surface requirements after flushing is without particle and impurity attachment.
After completion of processing, through inspection, the target material surface roughness Ra using method of the present invention to process is 0.4 μm, does not find distortion.
The above; be only the present invention's preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.

Claims (8)

1. a processing method for target material surface, is characterized in that the method comprises the steps:
(1) mechanical roughing is carried out to processed target material surface;
(2) adopt Mechanical polishing equipment to carry out grinding and polishing to target material surface, wherein said Mechanical polishing equipment has two parallel roll shafts that can move in parallel up and down, and the A/F of described parallel roll shaft can adjust;
(3) with the target material surface of high pressure de-ionized water rinse after grinding and polishing;
Wherein step (2) specifically comprises the steps:
A the A/F of described parallel roll shaft is adjusted to required width by ();
B () wraps up abrasive band or cloth on parallel roll shaft, and drive abrasive band or cloth to rotate grinding and polishing target material surface by the rotation of roll shaft, utilize the relative motion of abrasive band or cloth and target material surface to carry out grinding and polishing to target, in grinding and polishing process, use deionized water to carry out rinsing, lubricating;
C the abrasive band on () Mechanical polishing equipment is according to target material surface requirement, the order from coarse to fine according to the granularity in abrasive band changes abrasive band, carries out grinding and polishing successively; According to target material surface situation, abrasive band from coarse to fine is used to carry out grinding and polishing successively, behind each replacing abrasive band to the grinding and polishing of target material surface repeatedly;
Wherein, the rotational line speed of the abrasive band that parallel roll shaft wraps up or cloth is more than or equal to 4m/s, and the roll shaft even angle rate of Mechanical polishing equipment rotates.
2. method according to claim 1, is characterized in that: the mechanical roughing in step (1) comprise Vehicle Processing, Milling Machining, mill processing, plane processing in one or more.
3. method according to claim 1, is characterized in that: described abrasive band is waterproof abrasive paper.
4. method according to claim 1, is characterized in that: described cloth is canvas, velvet or cloth Buddhist nun.
5. method according to claim 1, is characterized in that: after the grinding and polishing of use sand paper, use cloth to carry out grinding and polishing to target material surface.
6. method according to claim 1, is characterized in that: the thickness range of described target is 1mm ~ 40mm, and length and the Thickness Ratio of described target are greater than 20:1.
7. method according to claim 1, is characterized in that: the target material surface roughness Ra after step (1) roughing is at 1.0 ~ 20 μm.
8. method according to claim 1, is characterized in that: described Mechanical polishing equipment processes the roughness that the target material surface obtained has Ra0.3 ~ 1.0 μm.
CN201110037143.6A 2011-02-12 2011-02-12 Machining method of target surface Active CN102632447B (en)

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Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
CN104668883A (en) * 2013-12-03 2015-06-03 宁波江丰电子材料股份有限公司 Processing method of target module sputtering surface
CN107866721A (en) * 2016-09-26 2018-04-03 合肥江丰电子材料有限公司 The processing method of target material assembly
CN111975465A (en) * 2020-08-14 2020-11-24 合肥江丰电子材料有限公司 Polishing process of molybdenum target sputtering surface
CN112828541A (en) * 2021-01-04 2021-05-25 宁波江丰电子材料股份有限公司 Tantalum target material and processing method of sputtering surface thereof
CN113021125B (en) * 2021-03-04 2022-09-30 宁波江丰电子材料股份有限公司 Method for processing titanium target sputtering surface
CN113442000A (en) * 2021-06-08 2021-09-28 先导薄膜材料有限公司 Preparation method of metallic bismuth planar target
CN115488409A (en) * 2022-10-25 2022-12-20 宁波江丰电子材料股份有限公司 Method for processing patterns of anti-sticking board
CN119328426A (en) * 2024-09-27 2025-01-21 西安理工大学 Surface treatment method of pure titanium sputtering target

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