JPH08206816A - Method for casting-in metal base composite material - Google Patents
Method for casting-in metal base composite materialInfo
- Publication number
- JPH08206816A JPH08206816A JP3311095A JP3311095A JPH08206816A JP H08206816 A JPH08206816 A JP H08206816A JP 3311095 A JP3311095 A JP 3311095A JP 3311095 A JP3311095 A JP 3311095A JP H08206816 A JPH08206816 A JP H08206816A
- Authority
- JP
- Japan
- Prior art keywords
- composite material
- casting
- cast
- alloy
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 33
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 22
- 239000002184 metal Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 13
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims description 18
- 230000007547 defect Effects 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 16
- 229910052725 zinc Inorganic materials 0.000 description 16
- 239000011701 zinc Substances 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000011156 metal matrix composite Substances 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- -1 zinc Chemical compound 0.000 description 1
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、金属基複合材料をＡｌ
合金で鋳包む方法に関する。BACKGROUND OF THE INVENTION The present invention relates to a metal matrix composite material made of Al.
It relates to a method of casting with an alloy.
【０００２】[0002]
【従来の技術】金属基複合材料をＡｌ合金で鋳包む方法
として、界面の接合強度を向上させるために鋳包まれる
金属基複合材料の表面を亜鉛にて被覆し、これを鋳型内
に配置したあとＡｌ溶湯を注入して、表面の亜鉛被膜を
拡散させ、次いで熱処理を施す方法が知られている（特
開昭62−89564 号公報参照）。また、型内に設置して鋳
包まれる金属基複合材料に対し、Ａｌ溶湯に高圧をかけ
ながら鋳包み、界面の接合強度を向上させる鋳造方法が
ある。2. Description of the Related Art As a method of casting a metal-based composite material in an Al alloy, the surface of the metal-based composite material to be cast-in is coated with zinc in order to improve the bonding strength at the interface, and this is placed in a mold. After that, a method is known in which Al molten metal is injected to diffuse the zinc coating on the surface, and then heat treatment is performed (see JP-A-62-89564). Further, there is a casting method in which a metal-based composite material placed in a mold and cast therein is cast while applying high pressure to an Al molten metal to improve the joint strength at the interface.
【０００３】[0003]
【発明が解決しようとする課題】前者の金属基複合材料
（複合材と略記）の表面を亜鉛にて被覆する方法には、
次のような問題点がある。 1) 鋳包みに際して、事前に、鋳包まれる複合材の表面
に亜鉛を被覆せねばならないため、能率よく安価に複合
材を鋳包んだ複合部材を製造するのは困難である。 2) 鋳包み時に、７００〜８００℃に加熱されたＡｌ溶
湯により亜鉛は溶解するが、蒸気圧が 8.14 ×10-3 MPa
（700 ℃）〜 3.10 ×10-2 MPa（800 ℃）と高いため、
亜鉛の一部はＡｌ中に拡散するが、一部は亜鉛蒸気とな
り、複合材と母材の界面に気孔を形成し健全な界面が得
られない。図５にその状態を示す。黒い部分がその気孔
である。 3) 鋳包み界面に未拡散の亜鉛層が存在する場合、これ
をＴ6 の熱処理と並行して拡散させると、亜鉛の拡散し
た跡がカーケンドルボイドとなり、健全な界面が得られ
ない。すなわち、未拡散の亜鉛層が存在する複合材鋳包
み鋳物に対して525 ℃× 8H 〜 160℃× 6H のＴ6 処理
を施したところ、図６に示すように亜鉛の拡散によるカ
ーケンドルボイドが界面に生じた。 また、高圧鋳造による後者の方法は、中子を用いた複雑
形状の鋳物には当然適用できない。一方、溶湯撹拌法や
溶湯鍛造法によって製造された複合材料は製造時にガス
が巻き込まれ、それが鋳包みによって界面にガス欠陥を
生じ、界面の接合強度を低下させてしまう。本発明は、
前記事情に鑑みてなされたもので、前記問題点を解消し
た金属基複合材料の鋳包み方法を提供することを目的と
する。The method of coating the surface of the former metal-based composite material (abbreviated as composite material) with zinc is as follows.
There are the following problems. 1) Since the surface of the composite material to be cast-in must be coated with zinc before casting, it is difficult to efficiently and inexpensively manufacture a composite member in which the composite material is cast-in. 2) At the time of casting, zinc is melted by the Al melt heated to 700 to 800 ° C, but the vapor pressure is 8.14 × 10 -3 MPa.
(700 ℃) ~ 3.10 × 10 -2 MPa (800 ℃) high,
Part of zinc diffuses into Al, but part becomes zinc vapor, and pores are formed at the interface between the composite material and the base material, so that a sound interface cannot be obtained. The state is shown in FIG. The black areas are the pores. 3) If a non-diffused zinc layer exists at the cast-in interface, if this is diffused in parallel with the heat treatment of T6, the zinc diffusion trace becomes Kirkendall voids, and a sound interface cannot be obtained. That is, when T6 treatment at 525 ° C x 8H to 160 ° C x 6H was applied to a composite cast-in casting having an undiffused zinc layer, Kirkendall voids due to zinc diffusion were observed as shown in Fig. 6. It happened to. Further, the latter method of high pressure casting cannot be applied to a casting having a complicated shape using a core. On the other hand, in the composite material manufactured by the molten metal stirring method or the molten metal forging method, gas is entrained during manufacturing, which causes gas defects at the interface due to casting encapsulation and reduces the bonding strength at the interface. The present invention
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a casting method for a metal-based composite material that solves the above problems.
【０００４】[0004]
【課題を解決するための手段】前記目的に添い、本発明
はＡｌ合金の溶湯に、ＳｉＣ粒子を添加撹拌して複合素
材を作り、この複合素材を再び真空雰囲気において溶解
して、前記撹拌時に素材に取り込まれたガスを放出させ
たあと凝固させ、この材料で鋳包まれる部材を作り、こ
の部材をＡｌ合金で鋳包む金属基複合材料の鋳包み方法
とすることによって前記課題を解消した。[Means for Solving the Problems] In accordance with the above object, the present invention adds SiC particles to an Al alloy melt to stir to make a composite material, and melts the composite material again in a vacuum atmosphere. The above problem was solved by releasing the gas taken in the material and then solidifying it to form a member that is cast-in with this material, and using this method as a casting method for a metal-based composite material that is cast-in with an Al alloy.
【０００５】[0005]
【作用】ガスに起因する、鋳包まれる部材の界面付近の
欠陥の発生が避けられる。Operation: It is possible to avoid generation of defects near the interface of the cast-in member due to the gas.
【０００６】[0006]
【実施例】２サイクルエンジンのシリンダーヘッドに金
属基複合材料を鋳包む場合について、図１に示す製造プ
ロセスを参照しながら説明する。図２に示すようにシリ
ンダーヘッド１の燃焼室２に面する部分に金属基複合材
料３（網目部分）を鋳包むものとする。なお、４はプラ
グ孔、５は冷却水通路を示す。まず、マトリックスとし
てＪＩＳ ＡＣ４Ａ のＡｌ合金のインゴットを、ま
た、強化材として平均粒径１３μｍのＳｉＣ粒子（昭和
電工製）をそれぞれ用い、このＳｉＣ粒子が体積率で２
０％となるように、溶湯撹拌法によって均一に溶湯中に
分散させ複合素材を製造した。次に、この複合素材を真
空溶解炉にて真空度５×10-5 Torr ，溶解温度750 ℃で
２Ｈ保持して、素材の脱ガスを十分おこなったあと、真
空炉内にて金型に注湯し、清浄な複合素材を得た。次
に、この複合素材より直径６０mm ，厚さ９mmの円盤状
の被鋳包み部材（図２の網目部分３）を機械加工により
製作した。次に、シリンダーヘッドを鋳造する金型（１
５０℃に予熱）内に、この被鋳包み部材をセットし、Ｊ
ＩＳ ＡＣ４Ａ のＡｌ合金の溶湯（約７５０℃）を注
湯し、通常の重力鋳造によって鋳込み、そのままの状態
で室温まで冷却凝固させた。このようにして鋳造した部
材に対し、Ｔ6 処理，機械加工を施して製品とし、前記
図２に示すようなシリンダーヘッドを得た。EXAMPLE A case of casting a metal matrix composite material in a cylinder head of a two-cycle engine will be described with reference to the manufacturing process shown in FIG. As shown in FIG. 2, the metal matrix composite material 3 (mesh portion) is cast in the portion of the cylinder head 1 facing the combustion chamber 2. In addition, 4 shows a plug hole and 5 shows a cooling water passage. First, a JIS AC4A Al alloy ingot is used as a matrix, and SiC particles (manufactured by Showa Denko) having an average particle diameter of 13 μm are used as a reinforcing material. The SiC particles have a volume ratio of 2%.
A composite material was produced by uniformly dispersing the molten metal in the molten metal by the molten metal stirring method so that the content became 0%. Next, this composite material was held in a vacuum melting furnace at a vacuum degree of 5 × 10 −5 Torr and a melting temperature of 750 ° C. for 2 hours to sufficiently degas the material, and then poured into a mold in the vacuum furnace. After boiling, a clean composite material was obtained. Next, a disc-shaped cast-in member (mesh portion 3 in FIG. 2) having a diameter of 60 mm and a thickness of 9 mm was machined from this composite material. Next, the die (1
Preheat to 50 ° C) and set this cast-in member
A molten metal (about 750 ° C.) of IS AC4A Al alloy was poured, cast by normal gravity casting, and cooled and solidified to room temperature as it was. The member thus cast was subjected to T6 treatment and machining to obtain a product, and a cylinder head as shown in FIG. 2 was obtained.
【０００７】図３に、以上のプロセスによって製造した
シリンダーヘッドの境界付近における断面の金属組織を
示す。図によれば界面付近にもガスの介在による接合不
良の部分は存在せず、接合強度の高い良好な鋳包みがお
こなわれたことを示している。なお、比較のため真空溶
解による脱ガス処理を省略し、同一プロセスで製造した
シリンダーヘッドの複合材とＡＣ４Ｃとの境界付近の断
面の金属組織を図４に示す。図によれば、界面部分に複
合材中に含まれていたガスを起因とした隙間が生じてお
り、健全な界面はえられなかった。以上により真空溶解
によって脱ガス処理をおこなった複合材を用いることに
よって、ガスを起因とする欠陥がなく、界面接合強度が
高く、金属基複合材料を鋳包んだ部材がえられる。FIG. 3 shows the metallographic structure of the cross section near the boundary of the cylinder head manufactured by the above process. According to the figure, there is no bonding failure part due to the interposition of gas in the vicinity of the interface, indicating that good casting with high bonding strength was performed. For comparison, the degassing process by vacuum melting is omitted, and the metal structure of the cross section near the boundary between the composite material of the cylinder head manufactured by the same process and AC4C is shown in FIG. According to the figure, a gap due to the gas contained in the composite material was formed at the interface portion, and a sound interface could not be obtained. As described above, by using the composite material that has been degassed by vacuum melting, it is possible to obtain a member which has no defects caused by gas, has a high interfacial bonding strength, and has a metal-based composite material cast therein.
【０００８】[0008]
【発明の効果】本発明に係る方法によれば、以下のよう
な効果がえられる。 1) 亜鉛のような、アルミと濡れ性の良い金属を複合材
表面に被覆しなくてもよいため、能率よく安価に複合材
を鋳包んだ部材を得ることができる。 2) 蒸気圧の高い亜鉛を用いることがないため、亜鉛蒸
気によるガス欠陥が生じない。 3) 未拡散亜鉛層がないため、Ｔ6 処理時に亜鉛の拡散
によるボイドが生じない。 4) 複合材製造時に巻き込まれたガスを真空脱ガスする
ため、鋳包み時にガスが発生せず健全な界面が得られ
る。 5) 溶湯に圧力をかけなくても健全な界面が得られるた
め、中子を用いた複雑形状の製品が得られる。According to the method of the present invention, the following effects can be obtained. 1) Since it is not necessary to coat the surface of the composite material with a metal having good wettability with aluminum, such as zinc, a member in which the composite material is cast-in can be obtained efficiently and inexpensively. 2) Since zinc with high vapor pressure is not used, gas defects due to zinc vapor do not occur. 3) Since there is no undiffused zinc layer, voids due to zinc diffusion do not occur during T6 treatment. 4) Vacuum degassing of the gas entrapped during composite material manufacturing, so no gas is generated during casting and a sound interface can be obtained. 5) Since a sound interface can be obtained without applying pressure to the molten metal, a product with a complicated shape using a core can be obtained.
【図１】本発明に係る製造プロセスを説明する図であ
る。FIG. 1 is a diagram illustrating a manufacturing process according to the present invention.
【図２】本発明に係る方法で製造するシリンダーヘッド
の実施例の説明図である。FIG. 2 is an explanatory view of an example of a cylinder head manufactured by the method according to the present invention.
【図３】本発明に係る方法で製造したシリンダーヘッド
の断面の金属組織を示す図面に代る写真である。FIG. 3 is a photograph instead of a drawing, which shows a metallographic structure of a cross section of a cylinder head manufactured by the method according to the present invention.
【図４】図３の実施例に対応する比較例の金属組織を示
す図面に代る写真である。4 is a photograph replacing a drawing showing a metal structure of a comparative example corresponding to the example of FIG.
【図５】従来の方法による図３に対応する断面の金属組
織を示す図面に代る写真である。5 is a photograph replacing a drawing showing a metallographic structure of a cross section corresponding to FIG. 3 according to a conventional method.
【図６】同じく、従来の方法による図３に対応する断面
の金属組織を示す図面に代る写真である。FIG. 6 is a photograph replacing a drawing showing a metallographic structure of a cross section corresponding to FIG. 3 according to a conventional method.
１ シリンダーヘッド ２ 燃焼室 ３ 金属基複合材料 1 Cylinder head 2 Combustion chamber 3 Metal matrix composite material
Claims (1)
拌して複合素材を作り、この複合素材を再び真空雰囲気
において溶解して、前記撹拌時に素材に取り込まれたガ
スを放出させたあと凝固させ、この材料で鋳包まれる部
材を作り、この部材をＡｌ合金で鋳包むことを特徴とす
る金属基複合材料の鋳包み方法。1. A composite material is prepared by adding SiC particles to an Al alloy melt and stirring, and the composite material is melted again in a vacuum atmosphere to release the gas taken into the material during the stirring and then solidified. A casting method for a metal-based composite material, which comprises casting a member to be cast and wrapped with this material and casting the member with an Al alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3311095A JPH08206816A (en) | 1995-01-30 | 1995-01-30 | Method for casting-in metal base composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3311095A JPH08206816A (en) | 1995-01-30 | 1995-01-30 | Method for casting-in metal base composite material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08206816A true JPH08206816A (en) | 1996-08-13 |
Family
ID=12377526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3311095A Pending JPH08206816A (en) | 1995-01-30 | 1995-01-30 | Method for casting-in metal base composite material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08206816A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8052957B2 (en) | 2007-08-31 | 2011-11-08 | Jps Micro-Tech Co., Ltd. | Method of manufacturing flake aluminum oxide using microwave |
| CN111112582A (en) * | 2020-01-03 | 2020-05-08 | 珠海亿特立新材料有限公司 | Preparation method of high-density aluminum silicon carbide composite material |
-
1995
- 1995-01-30 JP JP3311095A patent/JPH08206816A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8052957B2 (en) | 2007-08-31 | 2011-11-08 | Jps Micro-Tech Co., Ltd. | Method of manufacturing flake aluminum oxide using microwave |
| CN111112582A (en) * | 2020-01-03 | 2020-05-08 | 珠海亿特立新材料有限公司 | Preparation method of high-density aluminum silicon carbide composite material |
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