JP2001020001A - Method for sintering powder compacted body - Google Patents
Method for sintering powder compacted bodyInfo
- Publication number
- JP2001020001A JP2001020001A JP11192856A JP19285699A JP2001020001A JP 2001020001 A JP2001020001 A JP 2001020001A JP 11192856 A JP11192856 A JP 11192856A JP 19285699 A JP19285699 A JP 19285699A JP 2001020001 A JP2001020001 A JP 2001020001A
- Authority
- JP
- Japan
- Prior art keywords
- sintering
- heat insulating
- powder compact
- jig
- thin portion
- 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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Links
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- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、粉末冶金における
粉末成形体の焼結技術に係わり、さらに詳しくは肉厚差
のある粉末成形体の焼結に際して、肉厚差に基づく昇温
速度の相違によって生じる熱膨張差に起因する焼結体の
割れを防止することができる粉末成形体の焼結方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for sintering powder compacts in powder metallurgy, and more particularly, to sintering of powder compacts having a difference in wall thickness, the difference in the rate of temperature rise based on the wall thickness difference. The present invention relates to a method for sintering a powder compact, which can prevent cracking of a sintered compact caused by a difference in thermal expansion caused by the difference.
【０００２】[0002]
【従来の技術】粉末冶金における焼結工程においては、
従来、原料粉末を圧縮成形した粉末成形体を金網（バッ
チ式炉）あるいはメッシュベルト（連続式炉）の上に直
接、あるいはセラミックプレートを敷いた上に載置した
状態で焼結するようにしていた。とくに、安定性に欠け
る形状の部品の場合には、粉末成形体を安定した姿勢で
支持することのできる形状のセラミックプレートを用い
て焼結し、部品の変形や融着を防止するようにしてい
た。2. Description of the Related Art In a sintering process in powder metallurgy,
Conventionally, a powder compact obtained by compression-molding a raw material powder is sintered directly on a wire mesh (batch furnace) or a mesh belt (continuous furnace) or placed on a ceramic plate. Was. In particular, in the case of parts with a shape lacking stability, sintering is performed using a ceramic plate having a shape capable of supporting the powder compact in a stable posture to prevent deformation and fusion of the part. Was.
【０００３】しかし、粉末成形体に肉厚差がある場合に
は、肉厚差による熱容量の相違によって昇温のタイミン
グがずれ、これが熱膨張の差を引き起こし、焼結中に割
れが発生することがある。However, when there is a difference in wall thickness between the powder compacts, the difference in heat capacity due to the difference in wall thickness causes the timing of temperature rise to shift, which causes a difference in thermal expansion and cracks during sintering. There is.
【０００４】そこで、このような割れ発生を回避するた
め、従来では肉厚差を小さくするために余肉を設けて焼
結し、焼結後に余肉を研削除去するような方法が採用さ
れていた。In order to avoid the occurrence of such cracks, conventionally, a method has been adopted in which a surplus is provided to reduce the thickness difference and sintered, and the surplus is ground and removed after sintering. Was.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記し
たような余肉を設ける方法では、熱膨張差が緩和され
て、焼結割れの防止がある程度可能であるものの、部品
重量が増し、部品設計の自由度が小さくなるばかりでな
く、材料が無駄になり、さらに研削除去するための工数
や設備が余分に必要となることから部品コストが増大す
るという問題点があり、このような問題点を解消するこ
とが肉厚差のある部品の焼結における課題となってい
た。However, in the above-described method of providing extra thickness, the difference in thermal expansion is reduced, and sintering cracks can be prevented to some extent, but the weight of parts increases, and the design of parts increases. Not only the degree of freedom is reduced, but also the material is wasted, and additional man-hours and equipment for grinding and removing are required, resulting in an increase in component costs. Has been a problem in sintering parts having a difference in wall thickness.
【０００６】[0006]
【発明の目的】本発明は、従来の焼結技術における上記
課題に着目してなされたものであって、肉厚差のある部
品の焼結に際して、材料や工数を無駄にすることなく割
れを防止することができ、部品コストを削減することが
できる粉末成形体の焼結方法を提供することを目的とし
ている。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional sintering technology. In sintering parts having a difference in thickness, cracks can be obtained without wasting material and man-hours. It is an object of the present invention to provide a method for sintering a powder compact, which can prevent such a problem and reduce the cost of parts.
【０００７】[0007]
【課題を解決するための手段】本発明の請求項１に係わ
る粉末成形体の焼結方法は、薄肉部分と厚肉部分とを一
体的に備えた粉末成形体を焼結するに際して、薄肉部分
を断熱治具に挟んだ状態で焼結する構成とし、本発明の
請求項２に係わる粉末成形体の焼結方法は、薄肉部分と
厚肉部分とを一体的に備えた粉末成形体を焼結するに際
して、薄肉部分を断熱治具で覆った状態で焼結する構成
としたことを特徴としており、粉末成形体の焼結方法に
おけるこのような構成を前述した従来の課題を解決する
ための手段としている。According to a first aspect of the present invention, there is provided a method for sintering a powder compact, comprising the steps of: sintering a powder compact having a thin portion and a thick portion integrally; In a method for sintering a powder compact according to a second aspect of the present invention, the powder compact having a thin portion and a thick portion is sintered. When sintering, it is characterized in that it is configured to be sintered in a state where the thin portion is covered with a heat insulating jig. Means.
【０００８】また、本発明に係わる粉末成形体の焼結方
法の望ましい実施の形態として請求項３に係わる焼結方
法においては、上記断熱治具がセラミックスである構成
としたことを特徴としている。Further, as a preferred embodiment of the method for sintering a powder compact according to the present invention, the sintering method according to claim 3 is characterized in that the heat insulating jig is made of ceramics.
【０００９】[0009]
【発明の作用】本発明の請求項１に係わる粉末成形体の
焼結方法においては、薄肉部分と厚肉部分とを一体的に
備えた粉末成形体を焼結するに際して、断熱治具によっ
て薄肉部分を挟んだ状態で焼結するようにしているの
で、断熱治具の温度上昇に伴って薄肉部分の温度が上昇
するようになることから、薄肉部分の急激な温度上昇が
なくなり、厚肉部分との熱膨張差が緩和される結果、焼
結工程における割れが防止されることになる。According to the method for sintering a powder compact according to the first aspect of the present invention, when sintering a powder compact having a thin portion and a thick portion integrally, the heat insulating jig is used to reduce the thickness of the powder compact. Since the sintering is performed with the part sandwiched, the temperature of the thin part increases as the temperature of the heat-insulating jig rises. As a result, the crack in the sintering step is prevented.
【００１０】また、本発明の請求項２に係わる粉末成形
体の焼結方法においても、薄肉部分が断熱治具に覆われ
た状態で焼結されることから、同様に薄肉部分の急激な
温度上昇が回避され、厚肉部分との熱膨張差が緩和され
るので割れが防止されることになる。Also, in the method of sintering a powder compact according to the second aspect of the present invention, since the thin portion is sintered in a state covered with the heat insulating jig, the temperature of the thin portion is also rapidly increased. The rise is avoided, and the difference in thermal expansion from the thick portion is reduced, so that cracks are prevented.
【００１１】本発明の請求項３に係わる粉末成形体の焼
結方法においては、断熱治具がセラミックス材料からな
るものであるから、焼結部品に融着するようなことがな
く、しかも熱容量および断熱効果が比較的大きいので、
薄肉部分の急激な温度上昇が効果的に緩和されることに
なる。In the method for sintering a powder compact according to the third aspect of the present invention, since the heat insulating jig is made of a ceramic material, it does not fuse to a sintered part, and further has a heat capacity and Because the insulation effect is relatively large,
The rapid rise in temperature of the thin portion is effectively mitigated.
【００１２】[0012]
【発明の実施の形態】本発明に係わる粉末成形体の焼結
方法は、上記のように粉末成形体の薄肉部分を断熱治具
でカバーすることにより当該薄肉部分の急激な温度上昇
を阻止し、熱膨張差を緩和することにより割れを防止し
ようとするものであるが、このような焼結方法を適用す
ることがとくに効果的な部品形状の例として、例えば図
２（ａ）および（ｂ）に示すように、歯車やスプロケッ
トなどのような中央部にハブ部を備えた車輪状部品の場
合には、粉末成形体１の厚肉部分１ｂａの寸法ｂ，ｃの
うちの小さい方の寸法が薄肉部分１ａの厚さａの２倍を
超えると共に、薄肉部分１ａの延出長さｄがその厚さａ
の３倍を超える形状であって、しかも薄肉部分１ａの外
側に大きな厚肉部を持たない形状のものを挙げることが
できる。BEST MODE FOR CARRYING OUT THE INVENTION The method for sintering a powder compact according to the present invention prevents a sharp rise in temperature of the thin compact by covering the thin portion of the powder compact with an insulating jig as described above. In order to prevent cracks by relaxing the difference in thermal expansion, examples of the component shapes that are particularly effective to apply such a sintering method are, for example, those shown in FIGS. 2 (a) and 2 (b). ), In the case of a wheel-shaped component having a hub portion in the center, such as a gear or a sprocket, the smaller one of the dimensions b and c of the thick portion 1ba of the powder compact 1. Exceeds twice the thickness a of the thin portion 1a, and the extension length d of the thin portion 1a is
And a shape that does not have a large thick portion outside the thin portion 1a.
【００１３】また、本発明に用いる断熱治具の材質とし
ては、請求項３に記載しているような窒化硅素，アルミ
ナなどのセラミック材の他には、例えばカーボンなど耐
熱性に優れた材料を使用することができ、粉末成形体の
薄肉部分の少なくとも半分以上の面積を上記治具により
カバーした状態で焼結することが望ましい。Further, as a material of the heat insulating jig used in the present invention, besides a ceramic material such as silicon nitride or alumina as described in claim 3, for example, a material having excellent heat resistance such as carbon is used. It can be used, and it is desirable to sinter while covering at least half the area of the thin part of the powder compact with the jig.
【００１４】[0014]
【発明の効果】本発明の請求項１に係わる粉末成形体の
焼結方法は、薄肉部分と厚肉部分とを一体的に備えた粉
末成形体の焼結に際し、薄肉部分を断熱治具によって挟
んだ状態で焼結するものであるから、薄肉部分のみが急
激に温度上昇するようなことがなくなり、厚肉部分との
温度差およびこれによる熱膨張差を緩和することがで
き、焼結部品の割れを効果的に防止することができると
いう極めて優れた効果をもたらすものである。According to the method of sintering a powder compact according to the first aspect of the present invention, when the powder compact having a thin portion and a thick portion integrated with each other is sintered, the thin portion is sintered by an insulating jig. Since it sinters in the sandwiched state, the temperature of only the thin portion does not rise sharply, and the temperature difference from the thick portion and the difference in thermal expansion due to this can be reduced, and the sintered part This has an extremely excellent effect that cracks can be effectively prevented.
【００１５】また、本発明の請求項２に係わる粉末成形
体の焼結方法は、同じく薄肉部分と厚肉部分とを一体的
に備えた粉末成形体の焼結において、薄肉部分を断熱治
具で覆った状態で焼結するものであるから、同様に薄肉
部分の急激な温度上昇を防止することができ、同様に焼
結部品の割れの防止が可能になるという極めて優れた効
果がもたらされる。According to a second aspect of the present invention, there is provided a method for sintering a powder compact, wherein the thin portion is a heat insulating jig in the sintering of a powder compact having a thin portion and a thick portion. Since the sintering is performed in a state covered by the sintering, the rapid rise of the temperature of the thin-walled portion can be similarly prevented, and the extremely excellent effect that the cracking of the sintered part can be similarly prevented is brought about. .
【００１６】本発明に係わる粉末成形体の焼結方法の実
施の形態として請求項３に係わる粉末成形体の焼結方法
においては、粉末成形体の薄肉部を挟んだり、覆ったり
するための断熱治具として、セラミックス製の治具を用
いるようにしているので、焼結部品との融着が防止でき
ると共に、熱容量および断熱効果が比較的大きく、薄肉
部分の急激な温度上昇をより効果的に防止することがで
きる。According to a third aspect of the present invention, there is provided a method for sintering a powder compact according to the present invention. Since a jig made of ceramics is used as the jig, fusion with sintered parts can be prevented, and the heat capacity and heat insulation effect are relatively large. Can be prevented.
【００１７】[0017]
【実施例】以下、本発明を実施例に基づいてさらに具体
的に説明する。EXAMPLES The present invention will be described below more specifically based on examples.
【００１８】実施例１ エンジン用バキュームポンプドライブスプロケットをＦ
ｅ−Ｃｕ−Ｃ系材料を用いて焼結するに際して、まず、
図１（ａ）に示すような外径Ｄｏ＝１０２ｍｍ、肉厚ｔ
＝４ｍｍの薄肉部分１ａの中心位置に、径Ｄｈ＝３２ｍ
ｍ、高さＨ＝２４．６ｍｍのハブ部（厚肉部分１ｂ）を
備えた粉末成形体１を圧粉成形した。 Example 1 A vacuum pump drive sprocket for an engine was
When sintering using an e-Cu-C material, first,
Outer diameter Do = 102 mm and wall thickness t as shown in FIG.
= Dm = 32m at the center of thin portion 1a
The powder compact 1 provided with a hub portion (thick portion 1b) having a height of 24.6 mm and a height H of 24.6 mm was compacted.
【００１９】次に、図１（ｂ）に示すように、それぞれ
１５ｍｍおよび１０ｍｍの厚さを有し、一辺Ｌ＝１３５
ｍｍの正方形をなし、窒化硅素（Ｓｉ3Ｎ4）からなるセ
ラミックプレートの中央部に内径Ｄｉ＝４０ｍｍの開口
部を設けた断熱治具２および３を用意した。Next, as shown in FIG. 1B, each has a thickness of 15 mm and 10 mm, and one side L = 135.
Heat-insulating jigs 2 and 3 each having a square shape of mm and having an opening having an inner diameter Di = 40 mm in the center of a ceramic plate made of silicon nitride (Si 3 N 4 ) were prepared.
【００２０】そして、図１（ｃ）に示すように、焼結炉
内の金網５の上に、厚さ１５ｍｍの治具２を敷いたの
ち、その上に前記粉末成形体１をハブ部１ｂが開口部に
嵌合するように載置し、さらに粉末成形体１の上に厚さ
１０ｍｍの治具３を載置し、薄肉部分１ａを両断熱治具
２および３の間に挟んだ状態で、６５０℃で脱ワックス
処理を行い、さらに１１４０℃で１５分間焼結すること
によって目的の焼結部品を得た。Then, as shown in FIG. 1C, a jig 2 having a thickness of 15 mm is laid on a wire mesh 5 in a sintering furnace, and the powder compact 1 is placed on the hub 1b. Is placed so as to fit into the opening, and a jig 3 having a thickness of 10 mm is further placed on the powder compact 1, and the thin portion 1 a is sandwiched between the heat insulating jigs 2 and 3. Then, dewaxing treatment was performed at 650 ° C., and sintering was further performed at 1140 ° C. for 15 minutes to obtain a target sintered part.
【００２１】得られた焼結部品の温度が常温に低下する
のを待って、外観検査を行うと共に、割れの発生しやす
い部分を数箇所切断することによって焼結割れ発生の有
無を調査した結果、外観検査、切断検査いずれの場合
も、割れの発生は認められなかった。Waiting for the temperature of the obtained sintered part to drop to room temperature, an appearance inspection was carried out, and the occurrence of sintering cracks was investigated by cutting several places where cracks are likely to occur. No cracking was observed in any of the appearance inspection and the cutting inspection.
【００２２】実施例２ 実施例１と同種の材料によって、同様の部品を焼結する
に際して、焼結炉内の金網５に敷いた厚さ１５ｍｍの断
熱治具２の上に、粉末成形体１を同様に載置したのち、
当該粉末成形体１に、同じく窒化硅素（Ｓｉ3Ｎ4）から
なり、図２（ａ）に示すような形状を備えた断熱治具４
を、図２（ｂ）に示すように、成形体１には直接触れな
いように被せ、粉末成形体１の薄肉部分１ａのみを上記
治具４によって覆った状態で、同様の脱ワックス処理お
よび焼結処理を行い、これによって目的の焼結部品を得
た。 Example 2 When sintering the same parts using the same kind of material as in Example 1, the powder compact 1 was placed on a 15 mm thick heat insulating jig 2 laid on a wire mesh 5 in a sintering furnace. After placing in the same way,
A heat insulating jig 4 made of silicon nitride (Si 3 N 4 ) and having a shape as shown in FIG.
As shown in FIG. 2 (b), the compact 1 is covered so as not to directly touch the compact 1, and only the thin portion 1 a of the compact 1 is covered with the jig 4. A sintering process was performed to obtain a target sintered part.
【００２３】そして、得られた焼結部品について、同様
に外観検査および切断検査を行った結果、いずれも割れ
の発生は認められなかった。The appearance and cutting of the obtained sintered parts were similarly examined. As a result, no cracks were found.
【００２４】比較例 実施例１と同種の材料によって、同様の部品を焼結する
に際して、焼結炉内の金網５に、厚さ１５ｍｍの上記治
具２を敷いて粉末成形体１を載置し、当該粉末成形体１
の上には断熱治具３あるいは４を載置することなく、同
様の条件のもとに脱ワックス処理および焼結処理を行う
ことによって焼結部品を得た。[0024] the material of Comparative Example 1 and the same type, when sintering the same parts, the wire net 5 of the sintering furnace, placing the powder compact 1 laid the jig 2 having a thickness of 15mm And the powder compact 1
A dewaxing process and a sintering process were performed under the same conditions without placing the heat-insulating jig 3 or 4 on the, to obtain a sintered part.
【００２５】そして、得られた焼結部品について、同様
の外観検査および切断検査を行った結果、薄肉部のルー
ト部に割れが発生していることが確認された。Then, the same appearance inspection and cutting inspection were performed on the obtained sintered parts, and as a result, it was confirmed that cracks occurred in the root portion of the thin portion.
【００２６】上記のように、本発明に係わる粉末成形体
の焼結方法においては、実施例１のように、薄肉部分と
厚肉部分とを一体的に備えた粉末成形体の薄肉部分の上
に断熱治具を載置し、薄肉部分を断熱治具で挟んで焼結
することにより、あるいは実施例２のように、薄肉部分
に直接載置することなく、断熱治具によって覆った状態
で焼結することにより、焼結過程における割れの発生を
効果的に防止できることが確認された。なお、発明者に
よる数多くの実験結果によれば、本発明の焼結方法を適
用することによって、薄肉部分の温度が厚肉部分に較べ
て１５０℃以上高くなることがなくなり、薄肉部の熱膨
張率が厚肉部の熱膨張率に較べて０．１２％以上高くは
ならないことが確認されている。As described above, in the method of sintering a powder compact according to the present invention, as in the first embodiment, a method for sintering a powder compact having a thin portion and a thick portion integrally formed thereon is used. By placing the heat-insulating jig and sintering the thin-walled portion with the heat-insulating jig or, as in Example 2, without directly placing the thin-walled portion on the heat-insulating jig, It has been confirmed that sintering can effectively prevent the occurrence of cracks in the sintering process. According to a number of experimental results by the inventor, by applying the sintering method of the present invention, the temperature of the thin portion does not become higher than 150 ° C. as compared with the thick portion, and the thermal expansion of the thin portion is prevented. It has been confirmed that the rate does not become higher than the thermal expansion coefficient of the thick part by 0.12% or more.
【図１】（ａ） 本発明に係わる粉末成形体の焼結方法
の実施例に用いた粉末成形体の形状および寸法を示す断
面図である。 （ｂ） 本発明に係わる粉末成形体の焼結方法の第１の
実施例に用いた断熱治具の形状および寸法を示す斜視図
である。 （ｃ） 本発明に係わる粉末成形体の焼結方法の第１の
実施例における粉末成形体に対する断熱治具の配置状態
を示す説明図である。FIG. 1A is a cross-sectional view showing the shape and dimensions of a powder compact used in an embodiment of a method for sintering a powder compact according to the present invention. (B) It is a perspective view which shows the shape and dimension of the heat insulation jig used for the 1st Example of the method of sintering the powder compact concerning this invention. (C) It is explanatory drawing which shows the arrangement | positioning state of the heat insulation jig | tool with respect to a powder compact in the 1st Example of the method of sintering the powder compact according to the present invention.
【図２】（ａ） 本発明に係わる粉末成形体の焼結方法
の第２の実施例に用いた断熱治具の形状を示す斜視図で
ある。 （ｂ） 本発明に係わる粉末成形体の焼結方法の第２の
実施例における粉末成形体に対する断熱治具の配置状態
を示す説明図である。FIG. 2 (a) is a perspective view showing the shape of a heat insulating jig used in a second embodiment of the method for sintering a powder compact according to the present invention. (B) It is explanatory drawing which shows the arrangement | positioning state of the heat insulation jig | tool with respect to a powder compact in the 2nd Example of the method of sintering the powder compact according to the present invention.
【図３】（ａ）および（ｂ）は本発明に係わる粉末成形
体の焼結方法を適用する粉末成形体の形状例を示すそれ
ぞれ断面図である。FIGS. 3A and 3B are cross-sectional views showing examples of the shape of a powder compact to which the method for sintering a powder compact according to the present invention is applied.
１ 粉末成形体 １ａ 薄肉部分 １ｂ 厚肉部分 ２，３，４ 断熱治具 DESCRIPTION OF SYMBOLS 1 Powder compact 1a Thin part 1b Thick part 2,3,4 Heat insulation jig
Claims (3)
粉末成形体を焼結するに際して、薄肉部分を断熱治具に
挟んだ状態で焼結することを特徴とする粉末成形体の焼
結方法。A sintering of a powder compact having a thin portion and a thick portion integrally, wherein the sintering is performed with the thin portion sandwiched between heat insulating jigs. Sintering method.
粉末成形体を焼結するに際して、薄肉部分を断熱治具で
覆った状態で焼結することを特徴とする粉末成形体の焼
結方法。2. A method of sintering a powder compact having a thin portion and a thick portion integrally, wherein the sintering is performed in a state where the thin portion is covered with a heat insulating jig. Sintering method.
徴とする請求項１または請求項２記載の粉末成形体の焼
結方法。3. The method according to claim 1, wherein the heat insulating jig is made of ceramic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19285699A JP3707069B2 (en) | 1999-07-07 | 1999-07-07 | Method for sintering powder compact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19285699A JP3707069B2 (en) | 1999-07-07 | 1999-07-07 | Method for sintering powder compact |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001020001A true JP2001020001A (en) | 2001-01-23 |
| JP3707069B2 JP3707069B2 (en) | 2005-10-19 |
Family
ID=16298120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19285699A Expired - Fee Related JP3707069B2 (en) | 1999-07-07 | 1999-07-07 | Method for sintering powder compact |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3707069B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010209400A (en) * | 2009-03-10 | 2010-09-24 | Sumitomo Electric Sintered Alloy Ltd | Method for producing sintered compact |
| CN114160796A (en) * | 2021-11-02 | 2022-03-11 | 深圳市万泽中南研究院有限公司 | Heat treatment process method for preparing turbine disc and turbine disc |
-
1999
- 1999-07-07 JP JP19285699A patent/JP3707069B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010209400A (en) * | 2009-03-10 | 2010-09-24 | Sumitomo Electric Sintered Alloy Ltd | Method for producing sintered compact |
| CN114160796A (en) * | 2021-11-02 | 2022-03-11 | 深圳市万泽中南研究院有限公司 | Heat treatment process method for preparing turbine disc and turbine disc |
| CN114160796B (en) * | 2021-11-02 | 2023-12-08 | 深圳市万泽中南研究院有限公司 | Heat treatment process method for preparing turbine disk and turbine disk |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3707069B2 (en) | 2005-10-19 |
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