JPH11320029A - Core for precision casting - Google Patents
Core for precision castingInfo
- Publication number
- JPH11320029A JPH11320029A JP13151198A JP13151198A JPH11320029A JP H11320029 A JPH11320029 A JP H11320029A JP 13151198 A JP13151198 A JP 13151198A JP 13151198 A JP13151198 A JP 13151198A JP H11320029 A JPH11320029 A JP H11320029A
- Authority
- JP
- Japan
- Prior art keywords
- oxide
- core
- sio
- precision casting
- ceramic
- 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.)
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、Ｎｉ基超合金な
どの耐熱合金溶湯を精密鋳造して複雑形状中空部分を有
する各種耐熱機械部品を製造する際に使用する精密鋳造
用中子に関するものであり、特に耐熱合金溶湯に対して
反応しにくい酸化物被覆層をシリカを主成分とするセラ
ミックス中子本体に被覆してなる精密鋳造用中子に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precision casting core used for precision casting of a heat-resistant alloy such as a Ni-base superalloy to produce various heat-resistant mechanical parts having a hollow portion having a complicated shape. More particularly, the present invention relates to a precision casting core in which an oxide coating layer that is hardly reactive to a heat-resistant alloy melt is coated on a ceramic core body containing silica as a main component.
【０００２】[0002]
【従来の技術】一般に、Ｎｉ基超合金などの耐熱合金製
タービンブレードやベーンには、使用中に過度の高温に
ならないように中心部に空気、蒸気または水などの流体
を流して冷却するための中空部分が設けられており、こ
の中空部分は、中空部分と同一形状を有する中子を鋳型
にセットし、鋳型と中子で構成されるキャビティに耐熱
合金溶湯を鋳込み、ついで中子を水酸化カリウム溶液な
どの苛性液体で浸出除去することにより形成される。前
記耐熱合金溶湯を精密鋳造するための中子として、従
来、シリカを主成分とするセラミックス中子が使用され
ており、このシリカを主成分とするセラミックス中子
は、ＳｉＯ2 系セラミックス、ＳｉＯ2 −ＺｒＳｉＯ4
系セラミックスまたはＳｉＯ2 −Ａｌ2 Ｏ3 系セラミッ
クスで構成されている。前記ＳｉＯ2 系セラミックスは
ＳｉＯ2 からなる組成を有し、前記ＳｉＯ2 −ＺｒＳｉ
Ｏ4 系セラミックスはＺｒＳｉＯ4 ：２０〜４０％を含
有し、残部：ＳｉＯ2 からなる組成を有し、さらに前記
ＳｉＯ2 −Ａｌ2 Ｏ3 系セラミックスはＡｌ2 Ｏ3 ：３
〜１０％を含有し、残部：ＳｉＯ2 からなる組成を有る
ことも知られている。2. Description of the Related Art Generally, a turbine blade or a vane made of a heat-resistant alloy such as a Ni-base superalloy is cooled by flowing a fluid such as air, steam or water to a central portion thereof so that an excessively high temperature does not occur during use. The hollow portion is provided, and in this hollow portion, a core having the same shape as the hollow portion is set in a mold, a heat-resistant alloy melt is cast into a cavity formed by the mold and the core, and then the core is cooled with water. It is formed by leaching out with a caustic liquid such as a potassium oxide solution. Wherein the heat-resistant alloy melt as core for precision casting, conventionally, silica has been used a ceramic core consisting mainly of a ceramic core mainly composed of silica is, SiO 2 based ceramics, SiO 2 -ZrSiO 4
It is made of a ceramic or SiO 2 —Al 2 O 3 ceramic. The SiO 2 based ceramics having a composition consisting of SiO 2, the SiO 2 -ZrSi
The O 4 -based ceramic has a composition of ZrSiO 4 : 20 to 40% and the balance: SiO 2 , and the SiO 2 -Al 2 O 3 -based ceramic has an Al 2 O 3 : 3.
It is also known to have a composition containing 10% to 10%, with the balance being SiO 2 .
【０００３】[0003]
【発明が解決しようとする課題】しかし、タービンブレ
ードやベーンを製造するためのＮｉ基超合金などの耐熱
合金は融点が高く、したがって、この耐熱合金の溶湯は
シリカを主成分とするセラミックス中子に対して反応し
やすい。耐熱合金の溶湯が上記シリカを主成分とするセ
ラミックス中子と反応すると、鋳造終了後、中子を水酸
化カリウム溶液などの苛性液体で浸出除去しようとして
も、タービンブレードやベーンの中空部分の内面に中子
の残査が張り付いて離れず、これを機械的に剥離するこ
とは困難である。また耐熱合金の溶湯が上記シリカを主
成分とするセラミックス中子と反応すると、耐熱合金の
成分組成がずれると共に中空部分の内面の鋳肌が荒れて
表面性状が悪化し、さらに中空部分の内面に欠陥が発生
することがある。中空部分の内面の鋳肌が荒れて表面性
状が悪いと中空部分を流れる流体の流れが悪くなって冷
却効率が低下し、さらに中空部分の内面に欠陥が生じる
と不良鋳物となって廃棄処分にしなければならなくな
る。However, heat-resistant alloys such as Ni-base superalloys for producing turbine blades and vanes have a high melting point. Therefore, the molten metal of this heat-resistant alloy is a ceramic core mainly composed of silica. Easy to react to. When the molten metal of the heat-resistant alloy reacts with the above-mentioned ceramic core containing silica as a main component, after casting is completed, even if the core is leached and removed with a caustic liquid such as a potassium hydroxide solution, the inner surface of the hollow portion of the turbine blade or vane is removed. However, it is difficult to mechanically peel off the core residue. In addition, when the molten metal of the heat-resistant alloy reacts with the ceramic core containing silica as a main component, the component composition of the heat-resistant alloy is deviated, and the casting surface on the inner surface of the hollow portion is roughened to deteriorate the surface properties. Defects may occur. If the casting surface on the inner surface of the hollow part is rough and the surface properties are poor, the flow of the fluid flowing through the hollow part will be worse and the cooling efficiency will be reduced. I have to.
【０００４】[0004]
【課題を解決するための手段】そこで、本発明者等は、
これらの課題を解決すべく研究を行った結果、従来のシ
リカを主成分とする従来のセラミックス中子を本体と
し、その表面に酸化ジルコニウム、酸化バリウム、酸化
セリウム、酸化ハフニウム、酸化ベリリウム、酸化イッ
トリウム、酸化カルシウム、酸化トリウムの内の１種の
単層または２種以上の複層からなる酸化物被覆層を形成
すると、中子表面に対する耐熱合金溶湯の反応性が低下
し、中子に接触する鋳物の鋳肌の荒れが無くなり、表面
欠陥もなくなって中子の残査が鋳肌に残ることがないと
云う知見を得たのである。Means for Solving the Problems Accordingly, the present inventors have
As a result of conducting research to solve these problems, the main body was a conventional ceramic core containing conventional silica as the main component, and zirconium oxide, barium oxide, cerium oxide, hafnium oxide, beryllium oxide, yttrium oxide on the surface. When an oxide coating layer composed of a single layer or two or more layers of calcium oxide and thorium oxide is formed, the reactivity of the heat-resistant alloy melt on the core surface is reduced and the core comes into contact with the core. It has been found that there is no roughening of the casting surface of the casting, no surface defects, and no residue of the core remains on the casting surface.
【０００５】この発明は、かかる知見にもとづいてなさ
れたものであって、シリカを主成分とするセラミックス
中子本体の表面に酸化ジルコニウム、酸化バリウム、酸
化セリウム、酸化ハフニウム、酸化ベリリウム、酸化イ
ットリウム、酸化カルシウム、酸化トリウムの内の１種
の単層または２種以上の複層からなる酸化物被覆層を形
成してなる精密鋳造用中子に特徴を有するものである。The present invention has been made on the basis of the above findings. Zirconium oxide, barium oxide, cerium oxide, hafnium oxide, beryllium oxide, yttrium oxide, The present invention has a feature in a core for precision casting in which an oxide coating layer composed of a single layer of calcium oxide or thorium oxide or a multilayer of two or more layers is formed.
【０００６】この発明の精密鋳造用中子を図面にもとづ
いてさらに具体的に説明する。図１は、この発明の精密
鋳造用中子の断面図であり、図１において、１はこの発
明の精密鋳造用中子、２はシリカを主成分とするセラミ
ックス中子本体、３は酸化物被覆層である。この発明の
精密鋳造用中子１の酸化物被覆層３は、吹き付け塗装、
塗布などいろいろな方法で形成することができるが、酸
化物被覆層３は総層厚が３〜８μｍの範囲内にあること
が好ましく、かかる厚さの酸化物被覆層を表面滑らかに
形成するには物理蒸着法または化学蒸着法により形成す
ることが最も好ましい。The precision casting core of the present invention will be described more specifically with reference to the drawings. FIG. 1 is a cross-sectional view of a precision casting core of the present invention. In FIG. 1, 1 is a precision casting core of the present invention, 2 is a ceramic core body mainly composed of silica, and 3 is an oxide. It is a coating layer. The oxide coating layer 3 of the core 1 for precision casting of the present invention is formed by spray coating,
Although the oxide coating layer 3 can be formed by various methods such as coating, the total thickness of the oxide coating layer 3 is preferably in the range of 3 to 8 μm. Is most preferably formed by a physical vapor deposition method or a chemical vapor deposition method.
【０００７】上記酸化物被覆層の総層厚を３〜８μｍに
定めたのは、酸化物被覆層の総層厚が３μｍ未満では薄
すぎて耐熱合金溶湯が中子本体と反応するのを阻止する
ことができず、一方、酸化物被覆層の総層厚を８μｍを
越えて厚くしても物理蒸着または化学蒸着のためのコス
トがかかるだけでそれ以上の効果がないことによるもの
である。The reason why the total thickness of the oxide coating layer is set to 3 to 8 μm is that if the total thickness of the oxide coating layer is less than 3 μm, it is too thin to prevent the molten heat-resistant alloy from reacting with the core body. On the other hand, if the total thickness of the oxide coating layer exceeds 8 μm, the cost for physical vapor deposition or chemical vapor deposition is increased and there is no further effect.
【０００８】[0008]
【発明の実施の形態】平均粒径：２μｍのＳｉＯ2 粉
末、平均粒径：２μｍのＺｒＳｉＯ4 粉末、平均粒径：
２μｍのＡｌ2 Ｏ3 粉末およびワックス系の有機バイン
ダーを用意し、これら粉末と有機バインダーを配合し、
混練したのち射出成形し、得られた射出成形体を脱脂、
焼成することにより、長さ：１２０ｍｍ、幅：１２ｍ
ｍ、厚さ：６ｍｍの寸法を有する表１〜表６に示される
成分組成のセラミックス中子本体を作製した。BEST MODE FOR CARRYING OUT THE INVENTION Average particle size: 2 μm SiO 2 powder, average particle size: 2 μm ZrSiO 4 powder, average particle size:
A 2 μm Al 2 O 3 powder and a wax-based organic binder were prepared, and these powders and an organic binder were blended.
After kneading, injection molding, the obtained injection molded body is degreased,
By firing, length: 120mm, width: 12m
m, thickness: A ceramic core body having a component composition shown in Tables 1 to 6 having a dimension of 6 mm was produced.
【０００９】このシリカを主成分とするセラミックス中
子本体の全表面に、真空蒸着により表１〜表６に示され
る酸化物被覆層を表１〜表６に示される厚さとなるよう
に形成し、本発明精密鋳造用中子１〜４５を作製した。
一方、上記シリカを主成分とするセラミックス中子本体
をそのまま従来精密鋳造用中子１〜３とした。上記本発
明精密鋳造用中子１〜４５および従来精密鋳造用中子１
〜３をそれぞれ図２の断面図に示されるようにロストワ
ックス鋳型４にセットした。An oxide coating layer shown in Tables 1 to 6 is formed on the entire surface of the ceramic core body containing silica as a main component so as to have a thickness shown in Tables 1 to 6 by vacuum deposition. The cores 1 to 45 for precision casting of the present invention were produced.
On the other hand, the above-mentioned ceramic core bodies containing silica as a main component were used as conventional cores 1 to 3 for precision casting. The above-mentioned cores for precision casting 1 to 45 of the present invention and the conventional core for precision casting 1
3 were set in the lost wax mold 4 as shown in the sectional view of FIG.
【００１０】一方、Ｃｒ：１０％、Ｃｏ：４．５％、
Ｗ：６．０％、Ａｌ：５．５％、Ｔｉ：２．１％、Ｔ
ａ：５．６％、Ｔｌ：２．１％、Ｍｏ：０．７％、Ｒ
ｅ：０．２％を含有し、残りがＮｉからなる成分組成を
有するＮｉ基超合金を真空溶解し、得られた溶湯を温
度；１４５０℃に保持し、鋳型４の湯口から鋳型４のキ
ャビティ５を十分満たすように鋳込むと共に冷却板６に
より鋳型底部から冷却することにより単結晶Ｎｉ基超合
金鋳物を鋳造した。On the other hand, Cr: 10%, Co: 4.5%,
W: 6.0%, Al: 5.5%, Ti: 2.1%, T
a: 5.6%, Tl: 2.1%, Mo: 0.7%, R
e: A Ni-based superalloy containing 0.2% and having a component composition consisting of Ni is vacuum-melted, and the obtained molten metal is kept at a temperature of 1450 ° C. 5 and sufficiently cooled from the bottom of the mold by a cooling plate 6 to cast a single crystal Ni-based superalloy casting.
【００１１】得られた単結晶Ｎｉ基超合金鋳物を鋳型か
らはずし、さらに上記中子を含む鋳物を水酸化カリウム
水溶液中に浸漬し、中子を浸出除去することにより中空
部分を有する単結晶Ｎｉ基超合金鋳物を作製した。得ら
れた単結晶Ｎｉ基超合金鋳物を切断し、中子と接した中
空部分の鋳肌表面を光学顕微鏡で観察し、表面粗さＲｍ
ａｘを求め、その結果を表１〜表６に示した。The obtained single-crystal Ni-base superalloy casting is removed from the mold, and the casting containing the core is immersed in an aqueous potassium hydroxide solution, and the core is leached out to remove single-crystal Ni having a hollow portion. A base superalloy casting was prepared. The obtained single crystal Ni-base superalloy casting is cut, and the casting surface of the hollow portion in contact with the core is observed with an optical microscope, and the surface roughness Rm
ax was determined, and the results are shown in Tables 1 to 6.
【００１２】さらに得られた単結晶Ｎｉ基超合金鋳物の
中空部分を蛍光浸透探査検査することにより中空部分の
鋳肌表面に発生した欠陥数を測定し、その結果を表１〜
表６に示した。Further, the number of defects generated on the casting surface of the hollow portion was measured by subjecting the hollow portion of the obtained single-crystal Ni-base superalloy casting to a fluorescent penetration inspection test.
The results are shown in Table 6.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【表２】 [Table 2]
【００１５】[0015]
【表３】 [Table 3]
【００１６】[0016]
【表４】 [Table 4]
【００１７】[0017]
【表５】 [Table 5]
【００１８】[0018]
【表６】 [Table 6]
【００１９】表１〜表６に示される結果から、セラミッ
クス中子本体の表面に酸化物被覆層を形成した本発明精
密鋳造用中子１〜４５を使用すると、表面に酸化物被覆
層の無いセラミックス中子本体からなる従来精密鋳造用
中子１〜３を使用するよりも得られた単結晶Ｎｉ基超合
金鋳物の中空部分の表面粗さＲｍａｘが小さく、さらに
単結晶Ｎｉ基超合金鋳物の中空部分の表面に発生する欠
陥数が少ないことが分かる。なお、この実施例ではセラ
ミックス中子本体の表面に形成する酸化物被覆層は代表
的な化学蒸着法である真空蒸着法により形成したが、代
表的な物理蒸着法であるスパッタリング法で形成しても
同じ結果が得られた。From the results shown in Tables 1 to 6, it can be seen that when the cores for precision casting of the present invention 1 to 45, each having an oxide coating layer formed on the surface of the ceramic core body, were used, there was no oxide coating layer on the surface. The surface roughness Rmax of the hollow portion of the obtained single crystal Ni-based superalloy casting is smaller than that obtained by using the conventional precision casting cores 1 to 3 composed of a ceramic core body, and the single crystal Ni-based superalloy casting is obtained. It can be seen that the number of defects generated on the surface of the hollow portion is small. In this example, the oxide coating layer formed on the surface of the ceramic core body was formed by a vacuum deposition method which is a typical chemical vapor deposition method, but was formed by a sputtering method which was a typical physical vapor deposition method. The same result was obtained.
【００２０】[0020]
【発明の効果】上述のように、この発明の精密鋳造用中
子を使用すると耐熱合金鋳物の複雑な形状を有する中空
部分の鋳肌を平滑にかつ欠陥が発生することなく製造す
ることができ、産業上すぐれた効果を奏するものであ
る。As described above, when the core for precision casting of the present invention is used, the casting surface of a hollow portion having a complicated shape of a heat-resistant alloy casting can be manufactured smoothly and without defects. It has excellent industrial effects.
【図１】この発明の精密鋳造用中子の断面図である。FIG. 1 is a sectional view of a core for precision casting of the present invention.
【図２】この発明の精密鋳造用中子をロストワックス鋳
型にセットした状態を示す断面図である。FIG. 2 is a sectional view showing a state in which the core for precision casting of the present invention is set in a lost wax mold.
１ この発明の精密鋳造用中子 ２ セラミックス中子本体 ３ 酸化物被覆層 ４ ロストワックス鋳型 ５ キャビティ ６ 冷却板 DESCRIPTION OF SYMBOLS 1 Core for precision casting of this invention 2 Ceramic core body 3 Oxide coating layer 4 Lost wax mold 5 Cavity 6 Cooling plate
Claims (5)
本体の表面に酸化ジルコニウム、酸化バリウム、酸化セ
リウム、酸化ハフニウム、酸化ベリリウム、酸化イット
リウム、酸化カルシウム、酸化トリウムの内の１種の単
層または２種以上の複層からなる酸化物被覆層を形成し
てなることを特徴とする精密鋳造用中子。1. A monolayer of one of zirconium oxide, barium oxide, cerium oxide, hafnium oxide, beryllium oxide, yttrium oxide, calcium oxide, and thorium oxide on a surface of a ceramic core body containing silica as a main component. A precision casting core comprising an oxide coating layer comprising at least two types of multiple layers.
本体の表面に酸化ジルコニウム、酸化バリウム、酸化セ
リウム、酸化ハフニウム、酸化ベリリウム、酸化イット
リウム、酸化カルシウム、酸化トリウムの内の１種の単
層または２種以上の複層からなる酸化物被覆層を、総層
厚が３〜８μｍの範囲内にあるように形成してなること
を特徴とする精密鋳造用中子。2. A monolayer of one of zirconium oxide, barium oxide, cerium oxide, hafnium oxide, beryllium oxide, yttrium oxide, calcium oxide, and thorium oxide on the surface of a ceramic core body containing silica as a main component. A core for precision casting, wherein an oxide coating layer comprising two or more types of multiple layers is formed so that the total layer thickness is in the range of 3 to 8 μm.
化学蒸着法により形成された被覆層であることを特徴と
する請求項１または２記載の精密鋳造用中子。3. The core for precision casting according to claim 1, wherein the oxide coating layer is a coating layer formed by a physical vapor deposition method or a chemical vapor deposition method.
中子本体は、ＳｉＯ 2 系セラミックス、ＳｉＯ2 −Ｚｒ
ＳｉＯ4 系セラミックスまたはＳｉＯ2 −Ａｌ2 Ｏ3 系
セラミックスからなることを特徴とする請求項１または
２記載の精密鋳造用中子。4. A ceramic containing silica as a main component.
The core body is SiO TwoCeramics, SiOTwo-Zr
SiOFourCeramics or SiOTwo-AlTwoOThreesystem
2. The method according to claim 1, wherein the material is made of ceramics.
2. The core for precision casting according to 2.
からなるセラミックスであり、前記ＳｉＯ2 −ＺｒＳｉ
Ｏ4 系セラミックスはＺｒＳｉＯ4 ：２０〜４０％を含
有し、残部：ＳｉＯ2 からなるセラミックスであり、前
記ＳｉＯ2 −Ａｌ2 Ｏ3 系セラミックスはＡｌ2 Ｏ3 ：
３〜１０％を含有し、残部：ＳｉＯ2からなるセラミッ
クスであることを特徴とする請求項４記載の精密鋳造用
中子。5. The method according to claim 1, wherein the SiO 2 ceramic is SiO 2.
A ceramic comprising the SiO 2 —ZrSi
The O 4 -based ceramics are ceramics containing ZrSiO 4 : 20 to 40% and the balance: SiO 2 , and the SiO 2 -Al 2 O 3 -based ceramics is Al 2 O 3 :
Containing 3-10%, balance: 4. precision casting core according which is a ceramic made of SiO 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13151198A JPH11320029A (en) | 1998-05-14 | 1998-05-14 | Core for precision casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13151198A JPH11320029A (en) | 1998-05-14 | 1998-05-14 | Core for precision casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11320029A true JPH11320029A (en) | 1999-11-24 |
Family
ID=15059755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13151198A Withdrawn JPH11320029A (en) | 1998-05-14 | 1998-05-14 | Core for precision casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11320029A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112317695A (en) * | 2020-11-05 | 2021-02-05 | 山东瑞泰新材料科技有限公司 | Casting method of marine reversible turbine blade |
| CN112321287A (en) * | 2020-11-05 | 2021-02-05 | 山东瑞泰新材料科技有限公司 | Silicon oxide ceramic core with corrosion resistance on surface and manufacturing method thereof |
| CN116375492A (en) * | 2023-01-18 | 2023-07-04 | 华中科技大学 | Coating for improving surface precision of layered extrusion molding ceramic, preparation and treatment method |
-
1998
- 1998-05-14 JP JP13151198A patent/JPH11320029A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112317695A (en) * | 2020-11-05 | 2021-02-05 | 山东瑞泰新材料科技有限公司 | Casting method of marine reversible turbine blade |
| CN112321287A (en) * | 2020-11-05 | 2021-02-05 | 山东瑞泰新材料科技有限公司 | Silicon oxide ceramic core with corrosion resistance on surface and manufacturing method thereof |
| CN116375492A (en) * | 2023-01-18 | 2023-07-04 | 华中科技大学 | Coating for improving surface precision of layered extrusion molding ceramic, preparation and treatment method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20050802 |