JPH07112619B2 - Ceramic coating casting method - Google Patents
Ceramic coating casting methodInfo
- Publication number
- JPH07112619B2 JPH07112619B2 JP63260270A JP26027088A JPH07112619B2 JP H07112619 B2 JPH07112619 B2 JP H07112619B2 JP 63260270 A JP63260270 A JP 63260270A JP 26027088 A JP26027088 A JP 26027088A JP H07112619 B2 JPH07112619 B2 JP H07112619B2
- Authority
- JP
- Japan
- Prior art keywords
- ceramic
- core
- casting
- casting method
- coating layer
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、金型、中子の両方あるいは何れか一方にセラ
ミックス溶射被膜を形成しておき、溶融金属を鋳込むこ
とにより鋳造品の外表面又は内表面あるいは両者にセラ
ミックス被覆を転写保持するセラミックス被覆鋳造法に
関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a ceramic sprayed coating on either or both of a mold and a core, and a molten metal is cast into the molded product to remove it from the cast product. The present invention relates to a ceramic coating casting method for transferring and holding a ceramic coating on a surface or an inner surface or both.
従来、被覆鋳造法としては、特開昭49-1429号公報及び
特開昭57-62851号公報等によって知られている。Conventionally, a coating casting method is known from JP-A-49-1429 and JP-A-57-62851.
しかしながら、前者は金属被覆の鋳造法であり、かつ溶
射層ａと鋳造品表面ｂとの結合は第３図に例示したよう
に該溶射層ａ表面の凹凸ａ′…を利用した機械的結合に
過ぎず、為に両者の密着力が弱く、摺動部品等に使用す
ると剥離し易い等の理由により実用化に至っていないの
が現状である。However, the former is a metal coating casting method, and the connection between the sprayed layer a and the surface b of the cast product is mechanical connection utilizing the irregularities a ′ on the surface of the sprayed layer a as illustrated in FIG. However, the adhesiveness between the two is weak and therefore, when used for sliding parts or the like, it is easy to peel off.
又、後者の被覆鋳造法は、溶射材料についてセラミック
スを含め特に限定していないが、セラミックスは化学的
に安定で、融点が高く、反応性に乏しい点を考えると、
当該公報に記載されている通り、中間層の選択と、鋳造
後の加圧焼結等の皮膜強化処理が非常に重要となる。In the latter coating casting method, although the thermal spray material is not particularly limited, including ceramics, considering that ceramics are chemically stable, have a high melting point, and have poor reactivity,
As described in the publication, selection of the intermediate layer and coating strengthening treatment such as pressure sintering after casting become very important.
そこで、セラミックスと溶融金属との中間層をTi等の活
性金属とすることが現在研究されているが、充分な密着
力を得ることは困難である。これを改善する方法として
は、加圧焼結等の後処理をする方法があるが、この加圧
焼結には高温、高圧を必要とし、かつ余分な工程が加わ
る為、コストアップする問題点を有している。Therefore, it is currently being researched to use an active metal such as Ti for the intermediate layer between the ceramics and the molten metal, but it is difficult to obtain sufficient adhesion. As a method of improving this, there is a method of performing post-treatment such as pressure sintering, but this pressure sintering requires high temperature and high pressure, and an extra step is added, which causes a problem of cost increase. have.
本発明は、従来の技術の有するこのような問題点に鑑み
てなされたものであり、その目的とするところは、耐熱
性、耐摩耗性等に優れたセラミックス溶射被膜を、鋳造
品の外表面又は内表面あるいは両者に強固に転写結合す
ることのできるセラミックス被覆鋳造法を提供しようと
するものである。The present invention has been made in view of such problems of the prior art, and an object thereof is to provide a ceramic sprayed coating excellent in heat resistance, wear resistance, etc. on the outer surface of a cast product. Another object of the present invention is to provide a ceramics coating casting method capable of firmly transfer-bonding to the inner surface or both.
上記目的を達成する為に、本発明におけるセラミックス
被覆鋳造法は、中子の表面に気孔率を高めた溶射条件に
てセラミックスを溶射してセラミックス溶射被膜層を形
成し、該中子を金型内に保持しダイカストあるいはスク
イズ等の高圧鋳造法にて溶融金属を鋳込むことにより、
上記セラミックス溶射被膜層に溶融金属を物理的に浸透
結合させ、溶融金属の冷却凝固後前記中子を除去するこ
とにより鋳造品外表面又は内表面あるいは両者にセラミ
ックス被膜を転写保持するようにしたのである。In order to achieve the above-mentioned object, the ceramic coating casting method of the present invention is a method of spraying ceramics on a surface of a core under a thermal spraying condition with increased porosity to form a ceramic sprayed coating layer, By holding the inside and casting the molten metal by a high pressure casting method such as die casting or squeeze,
Since the molten metal is physically permeated and bonded to the ceramic sprayed coating layer and the core is removed after the molten metal is cooled and solidified, the ceramic coating is transferred and held on the outer surface or the inner surface of the cast product or both. is there.
上記セラミックス被覆鋳造法によれば、中子表面に対す
るセラミックスの溶射を、セラミックス被膜層の気孔率
が大きくなる条件下で行なう。According to the ceramic coating casting method described above, thermal spraying of ceramics onto the surface of the core is performed under the condition that the porosity of the ceramic coating layer increases.
即ち、溶射条件の一具体例としては、粉末供給量、溶射
距離を、通常の条件よりも増加させてやれば、セラミッ
クス粒子が余り溶解せず、ある程度球状を保ったまま被
覆を形成する状態が得られるので、セラミックス被膜層
には無数の連続、不連続の粒界気孔が形成される。That is, as one specific example of the thermal spraying conditions, if the powder supply amount and the thermal spraying distance are increased from the normal conditions, the ceramic particles do not melt so much, and the state of forming the coating while maintaining a spherical shape to some extent is obtained. As a result, countless continuous and discontinuous grain boundary pores are formed in the ceramic coating layer.
このようにして表面にセラミックス被膜処理された中子
を金型内の所定位置に設置した後、ダイカストあるいは
スクイズ等の高圧鋳造法によってAl合金等の溶融金属を
鋳込むと、鋳造時の高圧が加わって、セラミックス溶射
被膜層に対する溶融金属の浸透作用を起こす為、該セラ
ミックス被膜層に形成された無数の連続、不連続の気孔
は、溶融金属を容易に、かつ深部まで浸透させる為に機
能するので、当該セラミックス被膜層は溶融金属に強固
に転写結合され、為に、密着性の優れたセラミックス被
膜をもつ鋳造品を得ることができる。After the core coated with the ceramic coating on the surface in this way is installed at a predetermined position in the mold, when a molten metal such as an Al alloy is cast by a high pressure casting method such as die casting or squeeze, the high pressure during casting is In addition, since the molten metal permeates the ceramic sprayed coating layer, the innumerable continuous and discontinuous pores formed in the ceramic coating layer function to easily and deeply penetrate the molten metal. Therefore, the ceramic coating layer is strongly transfer-bonded to the molten metal, so that a cast product having a ceramic coating with excellent adhesion can be obtained.
又、中子の材質については、単純形状で寸法精度が要求
される場合は金属中子を、複雑形状を有するものについ
ては砂中子を使用するのが最良であるが、特にこれらに
限定されるものではなく、他に崩壊性中子の使用も可能
である。Also, regarding the material of the core, it is best to use a metal core when the shape is simple and dimensional accuracy is required, and it is best to use a sand core for those having a complicated shape. Besides, it is also possible to use a disintegrating core.
以下、本発明の実施例について図面を参照して説明す
る。Hereinafter, embodiments of the present invention will be described with reference to the drawings.
実施例１ 第１図に示したように、砂中子１に、第１コーティング
２として、水ガラス系の無機バインダーをジルコン粉と
混合したものを塗布し、加熱硬化させる。その上に第
２、コーティング３として、エチルシリケート系の無機
バインダーの層を上記と同様な方法で形成した。Example 1 As shown in FIG. 1, a sand core 1 is coated with a mixture of a water glass-based inorganic binder and zircon powder as a first coating 2, and is cured by heating. As the second coating 3, a layer of ethyl silicate-based inorganic binder was formed thereon in the same manner as above.
以上の前処理を終えた砂中子１の表面にAl2Ｏ3-40wt％T
iO2の粉末供給量を増やした条件で気孔率の比較的大き
い溶射被膜層４を200μｍ溶射した。Al 2 O 3 -40wt% T was formed on the surface of sand core 1 after the above pretreatment.
The sprayed coating layer 4 having a relatively large porosity was sprayed to 200 μm under the condition that the powder supply amount of iO 2 was increased.
このようにして製作した砂中子１を金型内の所定位置に
固定した後、ダイカスト鋳造を行なった。The sand core 1 thus produced was fixed at a predetermined position in the mold, and then die casting was performed.
鋳造後、エアーハンマーにより砂中子１を除去したとこ
ろ、砂落ちも良好でその断面は第２図及び第３図の写真
に示したようにAl合金５がセラミックス被膜層４に充分
浸透しており、該セラミックス被膜層４が強固に結合さ
れた良好な鋳造品が得られた。After casting, when the sand core 1 was removed with an air hammer, the sand fell off well, and the cross section was such that the Al alloy 5 had sufficiently penetrated into the ceramic coating layer 4 as shown in the photographs of FIGS. 2 and 3. Therefore, a good cast product in which the ceramic coating layer 4 was firmly bonded was obtained.
尚、第２図において白い部分はAl合金５、斜線部分はセ
ラミックス溶射被覆層４を夫々示し、第３図の写真にお
いて、白い部分はAl合金５を示し、 を示す。In FIG. 2, the white portion shows the Al alloy 5, the shaded portion shows the ceramic sprayed coating layer 4, and in the photograph of FIG. 3, the white portion shows the Al alloy 5. Indicates.
実施例２ 砂中子１にコロイダルシリカとジルコン粉を混合したも
のを塗布し、加熱硬化させ、その上に第２コーティング
としてシリコン樹脂を上記と同様な方法で形成した。Example 2 The sand core 1 was coated with a mixture of colloidal silica and zircon powder, heated and cured, and a silicone resin was formed thereon as a second coating in the same manner as above.
以上の前処理を終えた砂中子１の表面にCr2Ｏ3の粉末供
給量を増やした条件で気孔率の比較的大きい溶射被覆層
を100μｍ溶射した。On the surface of the sand core 1 which had been subjected to the above pretreatment, a sprayed coating layer having a relatively large porosity was sprayed to 100 μm under the condition that the powder supply amount of Cr 2 O 3 was increased.
このようにして製作した砂中子１を金型内の所定位置に
固定した後、スクイズ鋳造を行なった。The sand core 1 thus manufactured was fixed at a predetermined position in the mold, and then squeeze casting was performed.
鋳造後、エアーハンマーにより砂中子１を除去したとこ
ろ砂落ちも良好でAl溶湯はセラミックス溶射被膜層に充
分浸透しており、セラミックス被膜層が強固に結合され
た良好な鋳造品が得られた。After casting, when sand core 1 was removed with an air hammer, sand was removed well, and the molten aluminum was sufficiently permeated into the ceramic spray coating layer, and a good cast product in which the ceramic coating layer was firmly bonded was obtained. .
実施例３ Znの金属中子にAl2Ｏ3を150μｍ溶射したものを、金型
内の所定位置に固定し、ダイカスト鋳造を行なった。鋳
造後400℃で加熱してZn中子を除去したところAlはセラ
ミック溶射被膜層に充分浸透しており、セラミックス被
膜層が強固に結合された良好な鋳造品が得られた。Example 3 A metal core of Zn, which had been sprayed with Al 2 O 3 at a thickness of 150 μm, was fixed at a predetermined position in a mold, and die casting was performed. After casting, the Zn core was removed by heating at 400 ° C, and Al sufficiently penetrated into the ceramic sprayed coating layer, and a good cast product in which the ceramic coating layer was firmly bonded was obtained.
尚、上述実施例１、３のダイカスト鋳造条件は下記のと
うりである。The conditions for die casting in Examples 1 and 3 are as follows.
ゲート速度 25m/sec 鋳造圧力 760kg/cm2 溶湯材料 ADC-10 上述実施例２のスクイズ鋳造条件は下記のとうりであ
る。Gate speed 25 m / sec Casting pressure 760 kg / cm 2 Molten metal material ADC-10 The squeeze casting conditions in the above-mentioned Example 2 are as follows.
ゲート速度 0.8m/sec 鋳造圧力 900kg/cm2 溶湯材料 ADC-10 又、実施例１、２の砂中子は硅砂（粒度AFS・FN58、抗
折力90kg/cm2）を使用した。Gate speed 0.8 m / sec Casting pressure 900 kg / cm 2 Molten metal material ADC-10 In addition, silica sand (grain size AFS / FN58, transverse strength 90 kg / cm 2 ) was used as the sand core of Examples 1 and 2 .
中子表面へのセラミックス溶射被膜層溶射条件は下記の
通りである。The conditions for thermal spraying of the ceramic sprayed coating layer on the surface of the core are as follows.
溶射ガンはサーモスプレーガン（メテコ社製5P型）を使
用し、溶射ガンへの粉末供給量を12〜14g/分、溶射距離
を15〜20cmとして、セラミックス溶射被膜層の気孔率が
大きくなるような条件で中子表面に溶射を行なった。Use a thermo spray gun (Metco 5P type) as the thermal spray gun, supply powder to the thermal spray gun at 12 to 14 g / min, and spray distance at 15 to 20 cm to increase the porosity of the ceramic spray coating layer. The core surface was sprayed under various conditions.
以上説明したように本発明のセラミックス被覆鋳造法
は、気孔率が大きくなるような条件下で溶射して中子表
面に形成したセラミックス溶射被膜層４に高圧鋳造法に
よってAl溶湯を浸透させるようにしたので第２図及び第
３図の写真から明らかなように、セラミックス溶射被膜
層４にAl溶融金属が浸透し、セラミックス溶射被膜層４
とAl溶融金属の界面部が従来例を示した第４図に比べる
とセラミックスとAlの複合化状態となり物理的に強固に
結合してセラミックス被覆の密着性に優れた鋳造品を得
ることができ、従来例のように容易に剥離することはな
い為、例えばシリンダ・ライナーの摺動部のような耐摩
耗性が要求される製品や、シリンダヘッドのエグゾース
トポートの内面のように耐熱性、耐食性が要求される製
品等の鋳造に適し工業的価値は多大であり、又加圧焼結
等のような後処理工程を省くことができるのでコストダ
ウンに貢献する等の効果を奏する。As described above, in the ceramic coating casting method of the present invention, the Al molten metal is permeated by the high pressure casting method into the ceramic sprayed coating layer 4 formed on the core surface by thermal spraying under the condition that the porosity becomes large. Therefore, as is clear from the photographs of FIGS. 2 and 3, Al molten metal penetrated into the ceramic sprayed coating layer 4 and the ceramic sprayed coating layer 4 was formed.
Compared with the conventional example shown in FIG. 4, the interface between Al and Al molten metal is in a composite state of ceramics and Al, and it is possible to obtain a cast product with excellent adhesion of the ceramics coating by physically bonding them firmly. Since it does not peel off easily like the conventional example, it has heat resistance and corrosion resistance such as products that require abrasion resistance such as sliding parts of cylinders and liners, and the inner surface of the exhaust port of the cylinder head. It is suitable for casting products and the like requiring high industrial value, and has a great industrial value, and since post-treatment steps such as pressure sintering can be omitted, it has an effect of contributing to cost reduction.
第１図は本発明に係るセラミックス被覆鋳造法におい
て、中子表面にセラミックス溶射被膜を形成する一例を
示す拡大断面図、第２図は同鋳造法によって得た鋳造品
とセラミックス被覆との結合状態を示す一部の拡大断面
図、第３図は同鋳造法によって得た鋳造品とセラミック
ス被覆の結合部を示す金属組織の顕微鏡写真、第４図は
従来のセラミックス被覆鋳造法によって得た鋳造品とセ
ラミックス被覆の結合部を示す拡大断面図である。 １……中子、４……セラミックス溶射被膜 ５……Al合金FIG. 1 is an enlarged cross-sectional view showing an example of forming a ceramic sprayed coating on the surface of a core in the ceramics coating casting method according to the present invention, and FIG. 2 is a bonding state between a casting product obtained by the casting method and the ceramics coating. Fig. 3 is a partially enlarged sectional view showing Fig. 3, Fig. 3 is a micrograph of the metal structure showing the joint between the cast product obtained by the casting method and the ceramic coating, and Fig. 4 is the cast product obtained by the conventional ceramic coating casting method. It is an expanded sectional view which shows the joint part of a ceramic coating. 1 ... Core, 4 ... Ceramics sprayed coating 5 ... Al alloy
Claims (1)
セラミックスを溶射してセラミックス溶射被膜層を形成
し、該中子を金型内に保持しダイカストあるいはスクイ
ズ等の高圧鋳造法にて溶融金属を鋳込むことにより、上
記セラミックス溶射被膜層に溶融金属を物理的に浸透結
合させ、溶融金属の冷却凝固後前記中子を除去すること
により鋳造品外表面又は内表面あるいは両者にセラミッ
クス被膜を転写保持することを特徴とするセラミックス
被覆鋳造法。1. A high pressure casting method such as die casting or squeeze in which a ceramic sprayed coating layer is formed by spraying ceramics on the surface of a core under a spraying condition with an increased porosity, and the core is held in a mold. The molten metal is physically infiltrated and bonded to the ceramic sprayed coating layer by casting the molten metal at, and the core is removed after the molten metal is cooled and solidified to the outer surface or the inner surface of the cast product or both. A ceramic coating casting method characterized by transferring and holding a ceramic coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63260270A JPH07112619B2 (en) | 1988-10-14 | 1988-10-14 | Ceramic coating casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63260270A JPH07112619B2 (en) | 1988-10-14 | 1988-10-14 | Ceramic coating casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02108447A JPH02108447A (en) | 1990-04-20 |
| JPH07112619B2 true JPH07112619B2 (en) | 1995-12-06 |
Family
ID=17345725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63260270A Expired - Lifetime JPH07112619B2 (en) | 1988-10-14 | 1988-10-14 | Ceramic coating casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07112619B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921923A (en) * | 2012-10-25 | 2013-02-13 | 江苏大学 | Method for preparing TiC+Al2O3 particle-reinforced steel-based surface-recombined excavator form-relieved tooth |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69617600T2 (en) * | 1995-10-09 | 2002-07-25 | Ahresty Corp | Process for improving the surface of a cast workpiece |
| US7028744B2 (en) | 2004-03-17 | 2006-04-18 | National Research Council Of Canada | Surface modification of castings |
| US7055574B2 (en) * | 2004-07-27 | 2006-06-06 | Honeywell International Inc. | Method of producing metal article having internal passage coated with a ceramic coating |
| KR100591272B1 (en) * | 2005-11-21 | 2006-06-19 | 제갈훈 | Coating method for covering the flaw on the light metal mold |
| CN111842852A (en) * | 2020-07-30 | 2020-10-30 | 兰州理工大学 | Method for preparing wear-resistant corrosion-resistant high-strength copper and copper alloy structural member by liquid die forging infiltration |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5762851A (en) * | 1980-09-30 | 1982-04-16 | Natl Res Inst For Metals | Coating casting method |
-
1988
- 1988-10-14 JP JP63260270A patent/JPH07112619B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921923A (en) * | 2012-10-25 | 2013-02-13 | 江苏大学 | Method for preparing TiC+Al2O3 particle-reinforced steel-based surface-recombined excavator form-relieved tooth |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02108447A (en) | 1990-04-20 |
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