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1. 发明专利

DE19705527B4 未知
公开(公告)号：DE19705527B4
公开(公告)日：2005-02-10
申请号：DE19705527
申请日：1997-02-13
申请人： RIKEN KK , NISSAN MOTOR
发明人： ISHIBASHI AKIYOSHI , MIYAZAWA TOMONORI , MAKI KUNIO , FUJIKI AKIRA
IPC分类号： C22C33/02 , C22C38/00 , C22C38/52 , C22C38/44
摘要： An iron base sintered alloy with dispersed hard particles is provided which comprises by weight 3 to 15% nickel (Ni), 0.5 to 5% chromium (Cr), 0.5 to 2.0% carbon (C), the remainder iron (Fe) and unavoidable impurities. At least a part of nickel (Ni), molybdenum (Mo) and chromium (Cr) is contained in solid solution of an iron base matrix. At least a part of molybdenum (Mo) and chromium (Cr) is dispersed within the iron base matrix to form fine carbides or intermetallic compounds thereof. Uniformly dispersed within the iron base matrix are hard particles of 3 to 20% contain 50 to 57% chromium (Cr), 18 to 22% molybdenum (Mo), 8 to 12% cobalt (Co), 0.1 to 1.4% carbon (C), 0.8 to 1.3% silicon (Si) and the remainder iron (Fe) to strengthen the dispersion and remarkably improve wear resistance.

2. 发明专利

DE68926758T2 未知
公开(公告)号：DE68926758T2
公开(公告)日：1996-10-31
申请号：DE68926758
申请日：1989-04-18
申请人： NISSAN MOTOR , RIKEN KK
发明人： ISHIBASHI AKIYOSHI , TAKEMURA KAZUTOSHI , ABE MAKOTO , FUJIKI AKIRA , KISO KIMITSUGU , ITO TAKAAKI
IPC分类号： C22C33/02 , C22C38/00 , C22C38/56 , F02F7/00 , B22F1/00
摘要： A material for valve seats comprising a wear resisting sintered ferro alloy formed by dispersing particles of a high speed steel in a matrix in which hard alloy particles are dispersed. Steps for forming include mixing particles of a matrix material, carbide material and a hard alloy, and blending the mixture with high speed steel particles, pressurizing and casting the mixture after blending, then sintering them at 1000 to 1200 DEG C. In the preferred method, at least one element of Fe, C, Ni, Co, Si or Mn is included as the matrix material, and at least one element of Fe, Cr, Mo or V as the carbide material and at least one element of Fe, Cr, Mo, Co, C or W as the hard alloy are prepared. Furthermore, preferably includes the following amounts of the above mentioned elements, 0.5 to 2.0 wt% of C, 1 to 25 wt% of one or more of Cr, Mo, V, or W and 1 to 15 wt% of one or more of Co, Ni, Mn, or Si.

3. 发明专利

DE19705527A1 Hard phase dispersed iron@-based sintered alloy 未知
公开(公告)号：DE19705527A1
公开(公告)日：1998-08-20
申请号：DE19705527
申请日：1997-02-13
申请人： RIKEN KK , NISSAN MOTOR
发明人： ISHIBASHI AKIYOSHI , MIYAZAWA TOMONORI , MAKI KUNIO , FUJIKI AKIRA
IPC分类号： C22C33/02 , C22C38/00 , C22C38/52 , C22C38/44
摘要： The Fe-base sintered alloy comprises (in wt.%) 3-15 Ni, 3-15 Mo, 0.5-5 Cr, 0.5-2 C and balance Fe, in which Ni, Mo and Cr are dissolved in an Fe-based matrix, and Mo and Cr are dispersed as fine carbide, or intermetallic cpd. in the matrix, and 3-20 wt.% hard phase particles contg. (in wt.%) 50-57 Cr, 18-22 Mo, 8-12 Co, 0.1-1.4% C, 0.8-1.3 Si and balance Fe are uniformly dispersed in the matrix.

4. 发明专利

DE68926758D1 未知
公开(公告)号：DE68926758D1
公开(公告)日：1996-08-08
申请号：DE68926758
申请日：1989-04-18
申请人： NISSAN MOTOR , RIKEN KK
发明人： ISHIBASHI AKIYOSHI , TAKEMURA KAZUTOSHI , ABE MAKOTO , FUJIKI AKIRA , KISO KIMITSUGU , ITO TAKAAKI
IPC分类号： C22C33/02 , C22C38/00 , C22C38/56 , F02F7/00 , B22F1/00
摘要： A material for valve seats comprising a wear resisting sintered ferro alloy formed by dispersing particles of a high speed steel in a matrix in which hard alloy particles are dispersed. Steps for forming include mixing particles of a matrix material, carbide material and a hard alloy, and blending the mixture with high speed steel particles, pressurizing and casting the mixture after blending, then sintering them at 1000 to 1200 DEG C. In the preferred method, at least one element of Fe, C, Ni, Co, Si or Mn is included as the matrix material, and at least one element of Fe, Cr, Mo or V as the carbide material and at least one element of Fe, Cr, Mo, Co, C or W as the hard alloy are prepared. Furthermore, preferably includes the following amounts of the above mentioned elements, 0.5 to 2.0 wt% of C, 1 to 25 wt% of one or more of Cr, Mo, V, or W and 1 to 15 wt% of one or more of Co, Ni, Mn, or Si.

5. 发明专利

JPH0250904A WEAR RESISTANT SINTERED BODY 失效
公开(公告)号：JPH0250904A
公开(公告)日：1990-02-20
申请号：JP20256588
申请日：1988-08-12
申请人： RIKEN KK , NISSAN MOTOR
发明人： ISHIBASHI AKIYOSHI , ABE MAKOTO , YASUDA YOSHITERU
IPC分类号： F01L3/02 , B22F3/26 , F16C33/00 , F16C33/10
摘要： PURPOSE:To obtain a ferrous sintered member having excellent wear resistance in a wide temp. range by impregnating LiF as lubricant into voids in sintered body composed of mixed material of fine powder-state ferrous alloy, metal for forming hard carbide and carbon. CONSTITUTION:Into the fine powder of low alloy iron containing 1-25wt.% one or more kinds among hard carbide forming elements of Cr, Mo, V, W, etc., 1-25wt.% fine powder of one or more kinds of Ni, Co and Si and 0.5-2.0wt.% carbon fine powder are added and further, zinc stearate as the lubricant is added at about 0.6% and mixed and pressurized and compacted in a metallic mold. This green compact is taken out from the metallic mold and sintered, and after making the sintered body having 5-15vol.% void ratio, this is submerged into molten LiF and impregnated into the void. This LiF is acted as the lubricant, and high hardness wear resistant sintered body caused by metallic carbide is obtd. and the ferrous sintered member having excellent wear resistance in wide temp. range and suiting to valve seat material for interval combustion engine is obtd.

6. 发明专利

JPH01268849A WEAR-RESISTANT IRON-BASE SINTERED ALLOY AND ITS PRODUCTION 失效
公开(公告)号：JPH01268849A
公开(公告)日：1989-10-26
申请号：JP9351388
申请日：1988-04-18
申请人： RIKEN KK , NISSAN MOTOR
发明人： ISHIBASHI AKIYOSHI , TAKEMURA KAZUTOSHI , ABE MAKOTO , FUJIKI AKIRA , KISO KIMINORI , ITO TAKAAKI
IPC分类号： C22C33/02 , C22C38/00 , C22C38/56 , F02F7/00
摘要： PURPOSE:To improve wear resistance by means of fine carbides existing in high speed steel itself and also to obtain a wear-resistant iron-base sintered alloy excellent in bonding property between hard-phase grains and a matrix metal by mixing a high speed steel powder with a powdered raw material for the matrix of a wear-resistant iron-base sintered alloy in which hard-phase grains are blended. CONSTITUTION:At the time of manufacturing, e.g., valve seats for internal combustion engine by using a wear-resistant iron-base sintered alloy, one or >=2 elements among Fe, Cr, Mo, and V as carbide-forming elements, one or >=2 elements among Fe, Cr, Mo, Co, C, and W as hard-phase grains, and a high speed steel powder are blended with a powdered raw material containing one or >=2 elements among Fe, C, Ni, Co, Si, and Mn for forming the matrix of a sintered alloy, and the resulting powdered material having a composition consisting of 0.5-2.0% C, 1-25%, in total, of one or >=2 elements among Cr, Mo, V, and W, 1-15%, in total, of one or >=2 elements among Co, Ni, Mn, and Si, and the balance Fe is compacted and sintered. By this method, the iron-base sintered alloy having high bonding power between the hard grains and the matrix and excellent in wear resistance can be obtained.

7. 发明专利

JPH01178712A VALVE SEAT MADE OF IRON-BASED SINTERED ALLOY 失效
公开(公告)号：JPH01178712A
公开(公告)日：1989-07-14
申请号：JP33616987
申请日：1987-12-29
申请人： RIKEN KK , NISSAN MOTOR
发明人： TAKEMURA KAZUTOSHI , ISHIBASHI AKIYOSHI , ABE MAKOTO , TANIMOTO ICHIRO , FUJIKI AKIRA
IPC分类号： F01L3/02 , B22F3/26 , C22C1/05
摘要： PURPOSE:To enhance wear resistance by impregnating the void of a valve seat made of iron-based sintered alloy with a lubricating material. CONSTITUTION:A valve seat is made of an iron-based sintered alloy having a porosity of 5-15vol.%. The void of the iron-based sintered alloy is impregnated with lubricating materials such as white bronze, manganese bronze, etc. Since the melting points of these lubricating materials are well above the temperatures to which the valve seats are exposed, the lubricating effect does not decrease while the valve seats are used. By the above-mentioned means, the wear resistance of the valve seats can be enhanced.

8. 发明专利

JPH04259351A MANUFACTURE OF WEAR RESISTANT FERROUS SINTERED ALLOY 失效
公开(公告)号：JPH04259351A
公开(公告)日：1992-09-14
申请号：JP4086291
申请日：1991-02-14
申请人： NISSAN MOTOR , RIKEN KK
发明人： FUJIKI AKIRA , MORITA KENZO , ISHIBASHI AKIYOSHI , TAKEMURA KAZUTOSHI
IPC分类号： B22F1/02 , C22C33/02 , C22C38/00 , C22C38/16
摘要： PURPOSE:To manufacture a ferrous sintered alloy material in which the pores of the sintered body are fine and excellent in strength and wear resistance by sticking Cu on the surface of iron powder contg. specified alloy elements, subjecting it to compacting and sintering and thereafter executing the precipitation treatment of a Cu phase. CONSTITUTION:Iron powder contg., by weight, 0.3 to 2.5% C, 1 to 8% Cu and 3 to 14% of one or more kinds of alloying metallic elements such as Mo, W, V, Wb, Ta or the like is manufactured by a water atomizing method or the like. This iron powder is subjected to heat treatment to precipitate Cu on the surface, which is mixed with zinc stearate as a lubricant, and this mixture is filled into a die, is compacted and is thereafter sintered. This sintered product is cooled and is thereafter subjected to tempering treatment to precipitate fine Cu, which is uniformly dispersed therein. In this sintered product, large pores caused by the entering of Cu into solid soln. in Fe powder are not generated, so that an ferrous sintered alloy member excellent in strength can stably be obtd.

9. 发明专利

JPS6415349A FERROUS SINTERED ALLOY FOR VALVE SEAT 失效
公开(公告)号：JPS6415349A
公开(公告)日：1989-01-19
申请号：JP16966187
申请日：1987-07-09
申请人： NISSAN MOTOR , RIKEN KK
发明人： ABE MAKOTO , TANIMOTO ICHIRO , ISHIBASHI AKIYOSHI , TAKEMURA KAZUTOSHI
IPC分类号： C22C38/00 , C22C38/56
摘要： PURPOSE:To obtain a high-efficiency valve seat stock improved in wear resistance and capable of coping with increase in thermal and mechanical loads, by providing a structure in which specific amounts of specific hard-phase grains are uniformly dispersed in a ferrous matrix structure where high-concentration Ni and Mo exist in the form of solid solution. CONSTITUTION:A hard-phase grain dispersion-type ferrous sintered alloy for valve seat has a composition consisting of, by weight, 3-14% Ni, 3-14% Mo, 0.5-2.0% C, and the balance Fe with impurities, and further, it has a structure where hard-phase grains consisting of one or >=2 kinds selected from Cr-Mo-Co, Cr-W-Co, and Fe-Mo are uniformly dispersed by 3-20% in the structure of a matrix free from Cr, Co, W, etc.

10. 发明专利

JPS63161144A FERROUS SINTERED ALLOY FOR VALVE SEAT 失效
公开(公告)号：JPS63161144A
公开(公告)日：1988-07-04
申请号：JP30524286
申请日：1986-12-23
申请人： RIKEN KK , NISSAN MOTOR
发明人： ISHIBASHI AKIYOSHI , TAKEMURA KAZUTOSHI
IPC分类号： C22C38/00 , C22C38/12
摘要： PURPOSE:To manufacture a ferrous sintered alloy for valve seats for internal combustion engine excellent in wear resistance, by adding a carbon powder in a specific ratio to an iron powder in which specific amounts of Mo are uniformly allowed to enter into solid solution, by mixing them, and by subjecting the resulting mixture to compacting in a metal mold and then to sintering. CONSTITUTION:A graphite powder of a superfine grain size of

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