JP2019065729A - Sintered component, manufacturing method thereof and nozzle ring - Google Patents

Sintered component, manufacturing method thereof and nozzle ring Download PDF

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JP2019065729A
JP2019065729A JP2017189653A JP2017189653A JP2019065729A JP 2019065729 A JP2019065729 A JP 2019065729A JP 2017189653 A JP2017189653 A JP 2017189653A JP 2017189653 A JP2017189653 A JP 2017189653A JP 2019065729 A JP2019065729 A JP 2019065729A
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sintered
structural member
stainless steel
sliding member
nozzle ring
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哲史 安藤
Tetsushi Ando
哲史 安藤
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Showa Denko Materials Co Ltd
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Hitachi Chemical Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

To secure heat resistance, corrosion resistance and abrasion resistance, and also reduce costs.SOLUTION: A sintered component 10 comprises a structural member 11 formed of a sintered alloy with a composition of stainless steel, and a slide member 12 formed of a sintered alloy with a metallographic structure where hard particles are disposed on a stainless steel base. The slide member 12 is press-fitted into the structural member 11 and is then subjected to diffusion junction. The slide member 12 is a hollow body, and used in a nozzle ring of a turbocharger with a variable nozzle mechanism.SELECTED DRAWING: Figure 1

Description

本発明は、可変ノズル機構を有するターボチャージャのノズルリングに用いる焼結部品及びその製造方法並びにノズルリングに関する。   The present invention relates to a sintered part used for a nozzle ring of a turbocharger having a variable nozzle mechanism, a method of manufacturing the same, and a nozzle ring.

従来、可変ノズル機構を有するターボチャージャが提供されている（特許文献１を参照）。可変ノズル機構を有するターボチャージャにおいては、タービンハウジング内のノズルリングに取り付けられたベーンの回転角度によってタービンに向かう排気ガスの流れが調整され、タービンの回転が制御されている。   Conventionally, a turbocharger having a variable nozzle mechanism is provided (see Patent Document 1). In a turbocharger having a variable nozzle mechanism, the rotation angle of a vane attached to a nozzle ring in a turbine housing regulates the flow of exhaust gas toward the turbine to control the rotation of the turbine.

ターボチャージャのノズルリングは、タービンハウジング内において高温で腐食性を有する排気ガスに曝され、ベーンが回転できるように摺動可能に支持している。このようなノズルリングは、遠心鋳造された耐熱鋳鋼材を削り出し加工して作製されていた。一方、高温で腐食性を有する排気ガスやベーンの摺動に耐えられるように、耐熱性及び耐食性を有するステンレス鋼を基地として硬質粒子を分散させた金属組織により耐摩耗性を高めた焼結合金が提供されている（特許文献２を参照）。   The nozzle ring of the turbocharger is exposed to corrosive exhaust gases at high temperatures within the turbine housing and slidably supports the vane for rotation. Such a nozzle ring has been manufactured by cutting and processing a centrifugally cast heat-resistant cast steel material. On the other hand, a sintered alloy whose wear resistance is enhanced by a metal structure in which hard particles are dispersed with a heat resistant and corrosion resistant stainless steel as a base so as to withstand the high temperature corrosive exhaust gas and the sliding of the vane. Are provided (see Patent Document 2).

特公平７−１３４６８号公報Japanese Examined Patent 7-13468 特開２０１３−１９９６９５号公報JP, 2013-199695, A

耐熱鋳鋼材は、流通しているものを比較的安価に入手することができるが、溶解して作製するために固溶限度があって合金化の自由度が低く、材料の特色が出しにくく、耐熱性、耐食性及び耐摩耗性に限界があった。また、耐熱鋳鋼材の大きなブランクからノズルリングを切削加工するため、材料のロスが多かった。   Although heat-resistant cast steel can be obtained at a relatively low price as it is in circulation, it has a solid solubility limit because it is melted and produced, so the degree of freedom of alloying is low, and it is difficult to reveal the features of the material, There was a limit in heat resistance, corrosion resistance and wear resistance. In addition, since the nozzle ring was cut from a large blank of heat-resistant cast steel, there was a large loss of material.

ステンレス鋼を基地として硬質粒子を分散させた金属組織により耐摩耗性を高めた焼結合金は、ノズルリングに求められる耐熱性、耐食性及び耐摩耗性を備えることができるが、高価格であった。   A sintered alloy with wear resistance enhanced by a metal structure in which hard particles are dispersed based on stainless steel can provide the heat resistance, corrosion resistance and wear resistance required for the nozzle ring, but it is expensive .

この発明は、上述の実情に鑑みて提案されるものであって、ターボチャージャのノズルリングに用いる焼結部品であって、ノズルリングに求められる耐熱性、耐食性及び耐摩耗性を確保するとともに、価格が抑制されたるものを提供することを目的とする。また、そのような焼結部品の製造方法及び焼結部品を適用したノズルリングを提供することを目的とする。   The present invention has been proposed in view of the above-described circumstances, and is a sintered component used for a nozzle ring of a turbocharger, which secures the heat resistance, corrosion resistance and wear resistance required for the nozzle ring, and The purpose is to provide those whose price is controlled. Another object of the present invention is to provide a method of manufacturing such a sintered part and a nozzle ring to which the sintered part is applied.

上述の課題を解決するために、この出願に係る焼結部品は、ステンレス鋼の組成を有する焼結合金により形成された構造部材と、ステンレス鋼基地に硬質粒子が分散した金属組織を有する焼結合金により形成された摺動部材とを含んでいる。摺動部材が構造部材に圧入され、拡散接合されてなるものでもよい。摺動部材は、中空体であってもよい。   In order to solve the above-described problems, a sintered component according to this application is a sintered bond having a structural member formed of a sintered alloy having a composition of stainless steel and a metal structure in which hard particles are dispersed in a stainless steel matrix. And a sliding member formed of gold. The sliding member may be pressed into the structural member and diffusion bonded. The sliding member may be a hollow body.

この出願に係るノズルリングは、前記焼結部品を用いた可変ノズル機構を備えるターボチャージャに用いるノズルリングである。   The nozzle ring according to this application is a nozzle ring used in a turbocharger provided with a variable nozzle mechanism using the sintered component.

この出願に係る焼結部品の製造方法は、ステンレス鋼の組成を有する焼結合金により形成された構造部材を提供し、ステンレス鋼基地に硬質粒子が分散した金属組織を有する焼結合金により形成された構造部材を提供し、摺動部材を構造部材に圧入し、摺動部材及び構造部材を拡散接合することを含んでいる。ステンレス鋼の組成を有する焼結合金により構造部材を形成し、ステンレス鋼基地に硬質粒子が分散した金属組織を有する焼結合金により摺動部材を形成することの少なくとも一方を含んでもよい。   A method of manufacturing a sintered part according to this application provides a structural member formed of a sintered alloy having a composition of stainless steel, and is formed of a sintered alloy having a metal structure in which hard particles are dispersed in a stainless steel matrix. Providing the structural member, pressing the sliding member into the structural member, and diffusion bonding the sliding member and the structural member. The structural member may be formed of a sintered alloy having a composition of stainless steel, and the sliding member may be formed of a sintered alloy having a metal structure in which hard particles are dispersed in a stainless steel matrix.

この発明によると、ターボチャージャのノズルリングに求められる耐熱性、耐食性及び耐摩耗性を備えることができるとともに、価格を抑制することができる。また、焼結冶金により作製されるため、固溶限度の制限が小さく合金化の自由度が大きいため、耐熱性、耐食性及び耐摩耗性のような材料の特色を出しやすい。また、粉末冶金により作製するため、耐熱鋳鋼材のような大きなブランクから切削加工する必要がなく、加工により発生する材料のロスは少ない。   According to the present invention, the heat resistance, corrosion resistance and wear resistance required for the nozzle ring of the turbocharger can be provided, and the price can be suppressed. In addition, since it is manufactured by sintered metallurgy, the limit of solid solution limit is small and the degree of freedom of alloying is large, so it is easy to bring out the features of materials such as heat resistance, corrosion resistance and wear resistance. Further, since it is manufactured by powder metallurgy, it is not necessary to cut from a large blank such as a heat-resistant cast steel, and the loss of material generated by the processing is small.

本実施の形態の焼結部品を示す上面図及び側面図である。It is a top view and a side view showing a sintered part of the present embodiment. 本実施の形態の焼結部品の製造方法を説明する図である。It is a figure explaining the manufacturing method of the sintering components of this embodiment. 本実施の形態のノズルリングにベーンを搭載した状態を示す上面図である。It is a top view which shows the state which mounted the vane on the nozzle ring of this Embodiment.

以下、本実施の形態の焼結部品及びその製造方法並びにノズルリングについて、図面を参照して詳細に説明する。図１は、本実施の形態の焼結部品を示す上面図（ａ）及び側面図（ｂ）である。   Hereinafter, the sintered component of the present embodiment, the method of manufacturing the same, and the nozzle ring will be described in detail with reference to the drawings. FIG. 1 is a top view (a) and a side view (b) showing the sintered component of the present embodiment.

本実施の形態の焼結部品１０は、ステンレス鋼の組成を有する焼結合金から構成され、略環状板の形状を有してこの焼結部品１０の構造を画定する構造部材１１と、構造部材１１の厚み方向に形成された通孔１１ｃに圧入され、他の部材と摺動する管状の摺動部材１２とを有している。   The sintered component 10 of the present embodiment is made of a sintered alloy having a composition of stainless steel, and has a structural member 11 having a substantially annular plate shape to define the structure of the sintered component 10, and a structural member It has a tubular sliding member 12 which is press-fit into a through hole 11c formed in the thickness direction of 11, and slides with other members.

構造部材１１は、耐熱性及び耐食性を有する通常のステンレス鋼の組成を有する焼結合金で形成されたものである。本実施の形態では、構造部材１１には、ステンレス鋼の組成を有する焼結合金であるニッカロイＳＵ−２（日立化成株式会社製、商品名、「ニッカロイ」は登録商標。以下」）材（以下、単に「ＳＵ−２材」ということがある。）を使用するものとする。構造部材１１は、ＳＵ−２材のようにステンレス鋼の組成であるため、比較的安価である。   The structural member 11 is formed of a sintered alloy having a composition of normal stainless steel having heat resistance and corrosion resistance. In the present embodiment, in the structural member 11, a nickel alloy SU-2 (made by Hitachi Chemical Co., Ltd., a trade name, "Nikkaloy" is a registered trademark. The following ") material (hereinafter referred to as" sintered alloy ") , "SU-2 material" may be used.). The structural member 11 is relatively inexpensive since it has a composition of stainless steel like SU-2 material.

構造部材１１は、一軸を中心に所定径の内周及び外周によって画定される略回転対称な形状を有している。構造部材１１は、内周から外周に向かって径方向に所定の幅にわたって延びる所定の厚さを有する板状の主部１１ａと、主部１１ａを越えて径方向に外周まで所定の幅にわたって延びる主部１１ａよりも薄い所定の厚さを有する板状のフランジ部１１ｂとを有している。主部１１ａ及びフランジ部１１ｂは径方向に同程度の幅を有してもよく、それぞれの片側の面が同一面内にあってもよい。   The structural member 11 has a substantially rotationally symmetrical shape defined by an inner periphery and an outer periphery of a predetermined diameter around one axis. The structural member 11 has a plate-like main portion 11a having a predetermined thickness extending in the radial direction from the inner periphery to the outer periphery over a predetermined width, and extends over the predetermined width radially beyond the main portion 11a to the outer periphery And a plate-like flange portion 11b having a predetermined thickness thinner than the main portion 11a. The main portion 11a and the flange portion 11b may have approximately the same width in the radial direction, and the surface on one side of each may be in the same surface.

主部１１ａには、前記一軸を中心に所定の角度間隔で所定の径を有する通孔１１ｃが厚み方向に形成されている。図１に示すように、通孔１１ｃは、主部１１ａが径方向に延びる所定の幅について、略中央に形成されてもよい。また、９個の通孔１１ｃが、前記一軸について９回回転対称になるように形成されてもよい。   In the main portion 11a, through holes 11c having a predetermined diameter at predetermined angular intervals around the one axis are formed in the thickness direction. As shown in FIG. 1, the through hole 11 c may be formed substantially at the center of a predetermined width of the main portion 11 a extending in the radial direction. Further, nine through holes 11c may be formed so as to be rotationally symmetric nine times about the one axis.

摺動部材１２は、耐熱性及び耐食性を有するステンレス鋼基地に硬質粒子を分散させた金属組織を有する焼結合金で形成されたものである。本実施の形態では、摺動部材１２には、耐熱性、耐食性及び耐摩耗性を有する焼結合金としてニッカロイＳＵＴ−３３（日立化成株式会社製、商品名）材（以下、単に「ＳＵＴ−３３材」ということがある。）を使用するものとする。摺動部材１２は、ＳＵＴ−３３材のように耐摩耗性を確保するために特定の組成や金属組織を有するため、比較的高価である。   The sliding member 12 is formed of a sintered alloy having a metal structure in which hard particles are dispersed in a stainless steel base having heat resistance and corrosion resistance. In the present embodiment, the sliding member 12 is made of a nickel alloy SUT-33 (trade name, manufactured by Hitachi Chemical Co., Ltd.) as a sintered alloy having heat resistance, corrosion resistance and wear resistance (hereinafter simply referred to as "SUT-33"). Materials) may be used. The sliding member 12 is relatively expensive because it has a specific composition and metal structure to ensure wear resistance like a SUT-33 material.

ここで、ＳＵＴ−３３材は、オーステナイト系ステンレス鋼基地に硬質粒子を分散させた金属組織を有する焼結合金であり、表１に示すように、コバルト、モリブデン、クロム、ニッケル及びケイ素を含み、残りが鉄によって構成された組成を有している。表２には、焼結したＳＵＴ−３３材の機械的及び化学的性質を示している。ＳＵＴ−３３材の硬さの値を参照すると、ＳＵＴ−３３材が優れた対摩耗性を有することが見られる。   Here, the SUT-33 material is a sintered alloy having a metal structure in which hard particles are dispersed in an austenitic stainless steel matrix, and as shown in Table 1, contains cobalt, molybdenum, chromium, nickel and silicon, The remainder has a composition constituted by iron. Table 2 shows the mechanical and chemical properties of the sintered SUT-33 material. Referring to the hardness value of the SUT-33 material, it can be seen that the SUT-33 material has excellent antiwear properties.

Figure 2019065729
Figure 2019065729

Figure 2019065729
Figure 2019065729

摺動部材１２は、構造部材１１の通孔１１ｃに圧入することができるように、通孔１１ｃの内径及び深さに対応する外径及び高さを有するとともに、所定の内径を有する中空体である。   The slide member 12 is a hollow body having an outer diameter and a height corresponding to the inner diameter and the depth of the through hole 11c and being a hollow body having a predetermined inner diameter so that the slide member 12 can be press-fit into the through hole 11c of the structural member 11. is there.

図２は、本実施の形態の焼結部品１０の製造方法を説明する図である。図２（ａ）に示すように、構造部材１１を提供する。構造部材１１は、ＳＵ−２材を成型体とし、焼結して形成したものでもよい。一方、図２（ｂ）に示すように、摺動部材１２を提供する。摺動部材１２は、ＳＵＴ−３３材を成型体として、焼結して形成したものでもよい。図２（ａ）の構造部材１１を提供する工程と、図２（ｂ）の摺動部材を提供する工程は、順序に規定はなく、どちらが先でもよい。   FIG. 2 is a diagram for explaining the method of manufacturing the sintered component 10 of the present embodiment. As shown in FIG. 2 (a), a structural member 11 is provided. The structural member 11 may be formed by sintering an SU-2 material as a molded body. On the other hand, as shown in FIG. 2 (b), the sliding member 12 is provided. The sliding member 12 may be formed by sintering a SUT-33 material as a molded body. The steps of providing the structural member 11 of FIG. 2 (a) and the steps of providing the sliding member of FIG. 2 (b) are not specified in order, and either may be first.

図２（ｃ）は、構造部材１１と摺動部材１２とを接合して焼結部品１０を得る工程である。この工程では、図２（ａ）の工程で提供された構造部材１１の通孔１１ｃに、図２（ｂ）の工程で提供された摺動部材１２を圧入し、焼結により拡散接合する。拡散接合により、構造部材１１と摺動部材１２とは、一体の焼結部品１０として形成される。ここでは、仕上げ作業を殆ど必要としないニアネットシェイプ加工とすることが可能である。   FIG. 2C shows a step of bonding the structural member 11 and the sliding member 12 to obtain a sintered part 10. In this step, the sliding member 12 provided in the step of FIG. 2B is pressed into the through holes 11c of the structural member 11 provided in the step of FIG. 2A, and diffusion bonding is performed by sintering. By the diffusion bonding, the structural member 11 and the sliding member 12 are formed as an integral sintered component 10. Here, it is possible to use near net shape machining that requires almost no finishing work.

本実施の形態の焼結部品１０は、構造部材１１の通孔１１ｃに摺動部材１２が圧入され、構造部材１１及び摺動部材１２が拡散接合によって一体に形成されている。したがって、焼結部品１０の摺動部材１２における耐摩耗性が確保されている。また、構造部材１１に比較的安価な通常のステンレス鋼基地の焼結合金が使用されているため、比較的高価な摺動部材１２のための焼結合金の使用量は限られ、焼結部品１０全体として価格が抑制されている。   In the sintered component 10 of the present embodiment, the sliding member 12 is pressed into the through hole 11c of the structural member 11, and the structural member 11 and the sliding member 12 are integrally formed by diffusion bonding. Therefore, the wear resistance of the sliding member 12 of the sintered component 10 is secured. Further, since a relatively inexpensive conventional stainless steel-based sintered alloy is used for the structural member 11, the amount of the sintered alloy used for the relatively expensive sliding member 12 is limited, and the sintered component is used. 10 The price is restrained as a whole.

また、本実施の形態の焼結部品１０の製造方法は、焼結冶金により焼結部品１０を作製している。したがって、耐熱鋳鋼材の大きなブランクから切削加工する場合のように、加工により発生する材料のロスは少ない。また、ニアネットシェイプ加工とすることにより、後工程の負担を低減することができる。   Moreover, the manufacturing method of the sintered component 10 of this Embodiment is producing the sintered component 10 by sintering metallurgy. Therefore, as in the case of cutting from a large blank of heat-resistant cast steel, loss of material generated by processing is small. In addition, by employing near net shape processing, the burden on the subsequent steps can be reduced.

図３は、本実施の形態の焼結部品を適用したノズルリングを示す上面図である。ノズルリングは、可変ノズル機構を備えるターボチャージャにおいて、可変ノズル機構のベーンを回転可能に支持するものである。   FIG. 3 is a top view showing a nozzle ring to which the sintered component of the present embodiment is applied. The nozzle ring rotatably supports the vanes of the variable nozzle mechanism in a turbocharger provided with the variable nozzle mechanism.

ノズルリングにおいて、焼結部品１０は、図示しない駆動機構によって回転制御されるベーン２０の軸部を摺動部材１２によって摺動可能に支持している。本実施の形態の焼結部品１０において、摺動部材１２は耐摩耗性を有するＳＵＴ−３３材によって構成されているため、このノズルリングはベーンの摺動に対する十分な耐摩耗性を確保している。   In the nozzle ring, the sintered component 10 slidably supports the shaft portion of the vane 20 whose rotation is controlled by a drive mechanism (not shown) by the sliding member 12. In the sintered component 10 of the present embodiment, since the sliding member 12 is made of the SUT-33 material having wear resistance, the nozzle ring ensures sufficient wear resistance to the sliding of the vane. There is.

また、ノズルリングは、タービンハウジング内でタービンに向かう高温で腐食性を有する排ガスに曝されている。焼結部品１０において、構造部材１１は耐熱性及び耐食性を有するＳＵ−２材で作製され、摺動部材１２は耐熱性、耐食性及び耐摩耗性を有するＳＵＴ−３３材で作製されているため、このような排ガスに対する十分な耐熱性及び耐食性を確保している。   Also, the nozzle ring is exposed to corrosive exhaust gases at high temperatures towards the turbine within the turbine housing. In the sintered component 10, the structural member 11 is made of SU-2 material having heat resistance and corrosion resistance, and the sliding member 12 is made of SUT-33 material having heat resistance, corrosion resistance and abrasion resistance, Sufficient heat resistance and corrosion resistance to such exhaust gases are ensured.

１０ 焼結部品
１１ 構造部材
１２ 摺動部材 10 sintered parts 11 structural members 12 sliding members

Claims (6)

ステンレス鋼の組成を有する焼結合金により形成された構造部材と、
ステンレス鋼基地に硬質粒子が分散した金属組織を有する焼結合金により形成された摺動部材と
を含む焼結部品。 A structural member formed of a sintered alloy having a composition of stainless steel;
And a sliding member formed of a sintered alloy having a metal structure in which hard particles are dispersed in a stainless steel matrix. 前記摺動部材が前記構造部材に圧入され、拡散接合されてなる請求項１に記載の焼結部品。   The sintered component according to claim 1, wherein the sliding member is press-fit and diffusion bonded to the structural member. 前記摺動部材は、中空体である請求項１又は２に記載の焼結部品。   The sintered component according to claim 1, wherein the sliding member is a hollow body. 前記請求項１から３のいずれか一項に記載の焼結部品を用いた、可変ノズル機構を備えるターボチャージャのノズルリング。   A nozzle ring of a turbocharger provided with a variable nozzle mechanism using the sintered component according to any one of the preceding claims 1 to 3. ステンレス鋼の組成を有する焼結合金により形成された構造部材を提供し、
ステンレス鋼基地に硬質粒子が分散した金属組織を有する焼結合金により形成された構造部材を提供し、
摺動部材を前記構造部材に圧入し、
前記摺動部材及び前記構造部材を拡散接合すること
を含む焼結部品の製造方法。 To provide a structural member formed of a sintered alloy having a composition of stainless steel,
To provide a structural member formed of a sintered alloy having a metal structure in which hard particles are dispersed in a stainless steel base,
Press fitting the sliding member into the structural member;
A method of manufacturing a sintered component, comprising: diffusion bonding the sliding member and the structural member. ステンレス鋼の組成を有する焼結合金により構造部材を形成し、
ステンレス鋼基地に硬質粒子が分散した金属組織を有する焼結合金により摺動部材を形成すること、
の少なくとも一方を含む請求項５に記載の焼結部品の製造方法。 Forming a structural member from a sintered alloy having a composition of stainless steel,
Forming a sliding member from a sintered alloy having a metal structure in which hard particles are dispersed in a stainless steel base,
A method of producing a sintered part according to claim 5, comprising at least one of the following.
JP2017189653A 2017-09-29 2017-09-29 Sintered component, manufacturing method thereof and nozzle ring Pending JP2019065729A (en)

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Citations (6)

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Publication number Priority date Publication date Assignee Title
JPH01108349A (en) * 1987-10-19 1989-04-25 Toyota Motor Corp Sintered alloy having excellent high temperature wear resistance
JP2002047941A (en) * 2000-07-31 2002-02-15 Toyota Motor Corp Turbo charger with variable nozzle vane
JP2012052520A (en) * 2010-08-05 2012-03-15 Nippon Piston Ring Co Ltd Sliding member for turbocharger component, turbocharger component, and its manufacturing method
JP2013199695A (en) * 2012-03-26 2013-10-03 Hitachi Powdered Metals Co Ltd Sintered alloy and method for producing the same
JP2016069669A (en) * 2014-09-29 2016-05-09 日立化成株式会社 Production method of composite sinter machine component
JP2017137533A (en) * 2016-02-04 2017-08-10 Ntn株式会社 Composite sintered compact and method for producing the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01108349A (en) * 1987-10-19 1989-04-25 Toyota Motor Corp Sintered alloy having excellent high temperature wear resistance
JP2002047941A (en) * 2000-07-31 2002-02-15 Toyota Motor Corp Turbo charger with variable nozzle vane
JP2012052520A (en) * 2010-08-05 2012-03-15 Nippon Piston Ring Co Ltd Sliding member for turbocharger component, turbocharger component, and its manufacturing method
JP2013199695A (en) * 2012-03-26 2013-10-03 Hitachi Powdered Metals Co Ltd Sintered alloy and method for producing the same
JP2016069669A (en) * 2014-09-29 2016-05-09 日立化成株式会社 Production method of composite sinter machine component
JP2017137533A (en) * 2016-02-04 2017-08-10 Ntn株式会社 Composite sintered compact and method for producing the same

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