US3795511A - Method of combining iron-base sintered alloys and copper-base sintered alloys - Google Patents

Method of combining iron-base sintered alloys and copper-base sintered alloys Download PDF

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Publication number
US3795511A
US3795511A US00191606A US3795511DA US3795511A US 3795511 A US3795511 A US 3795511A US 00191606 A US00191606 A US 00191606A US 3795511D A US3795511D A US 3795511DA US 3795511 A US3795511 A US 3795511A
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US
United States
Prior art keywords
copper
base
iron
sintered
powder
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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
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US00191606A
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English (en)
Inventor
S Mitani
K Imanishi
K Ushitani
Y Serino
I Niimi
K Hashimoto
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Toyota Motor Corp
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Toyota Motor Corp
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Publication date
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Publication of US3795511A publication Critical patent/US3795511A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/22—Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49298—Poppet or I.C. engine valve or valve seat making
    • Y10T29/49306—Valve seat making
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]

Definitions

  • Method of combining iron-base sintered alloys and copper-base sintered alloys comprises steps of thinly coating mixed powder of copper and nickel onto joint surface of iron-base powder or sintered mass thereof, and subjecting the coating to sintering process using temperature applicable to iron-base powder. Joint surface of copper-nickel is then abutted with formed mass of copperbase powder and again subjected to sintering process using temperature applicable to copper-base powder. Integral piece is thereby obtained most suitable for fabricating valve seats of internal combustion engines.
  • the present invention relates to a method of combining iron-base sintered alloys and copper-base sintered alloys to produce an integral and solid alloy. These alloys have excellent adaptability for use as valve seats in internal combustion engines.
  • the valve seat When the head of an engine is made of cast iron and the valve seat is entirely made of a copper-base alloy, the copper-base material yields during use due to the difference in the coefficient of thermal expansion between the two materials. Also, the valve seat tends to move away from the engine head when the engine is cooled.
  • This problem may be solved by applying copper-base sintered material to the part of the valve seat that engages the face of the valve. Copper-base sintered material is a highly suitable valve seat material. The remaining portion of the valve seat is fabricated of ironbase sintered material which has a high heat resistance and coefiicient of thermal expansion very close to that of cast iron.
  • a method for combining iron-base sintered alloys and copper-base sintered alloys wherein a mixed powder of copper and nickel is thinly coated onto the joint surface of a formed mass of iron-base powder or the sintered mass thereof.
  • the coating is subjected to a sintering process utilizing the temperature applicable to iron-base powder.
  • the joint surface of copper-nickel is then abutted with a formed mass of copper-base powder and again subjected to a sintering process utilizing the temperature applicable to copper-base powder.
  • a unitary composite material is thereby obtained, the material being most suitable for fabricating valve seats as used in internal combustion engines.
  • FIG. 1 is a top plan view of a valve seat fabricated of material processed in accordance with the present invention
  • FIGS. 2 and 3 are cross sectional views of the valve seat of FIG. 1 illustrating the procedure of the present invention for combining different alloys into a unitary composite alloy materials;
  • FIG. 4 is a fragmental sectional view of the valve seat of FIGS. 1-3 in an internal combustion engine.
  • the individual figures illustrate an annulus of copper-base material 1 associated with an annulus of iron-base material 2.
  • the interface between the annuli 1 and 2 comprises joint material 3.
  • the copper-base 1, iron-base 2 and joint 3 material are formed into a sintered mass 5 in the shape of a valve seat.
  • the valve seat or sintered mass 5 cooperates with a head 4 of an internal combustion engine.
  • ironbase sintered material and copper-base sintered material are combined together into an intensified unitary sintered material.
  • the material thus combined is particularly adaptable for fabricating those parts and components of machines for which anti-friction qualities and wear resistance are indispensable, such as valve seats for automobile engines.
  • copper and nickel mixed powder is selected as the joint material 3.
  • This mixture is composed of electrolytic copper powder of under mesh and carbonyl nickel powder having a particle size of about 414..
  • An iron-base formed mass or sintered mass thereof is thinly coated with a uniform layer of the joint material 3.
  • the copper-nickel powder mixture may be uniformly coated onto an iron-base mixed powder after which the material is sintered at a temperature agreeable to iron-base sintered material.
  • the sintered mass is then placed in a mold and copper-base powder is filled in on top of it. Pressing the copper-base mixed powder causes entangling engagement between the powder and the rugged or rough surface of the iron-base sintered material which is rich with nickel. After this mass is sintered, nickel diffuses into the copperbase material to provide a very intense joint surface and excellent bond.
  • copper-nickel mixed powder should be utilized as the joint material in the present invention.
  • the advantageous result of the present invention is obtained by appropriately choosing the mixing ratio of copper and nickel by taking into consideration the constituents of the iron-base and copper-base materials to be combined.
  • the required joint strength is also important.
  • EXAMPLE Mixed powder composed of 96% iron, 3% moly'bdenum and 1% graphite was filled into a metal mold. A mixed powder of 50% copper and 50% nickel was then thinly and uniformly applied to the annulus 2, and then formed under a pressure of 6 t./cn1. into an annulus 2 and 3, as best illustrated in FIG. 2, which may also be sintered under the sintering conditions agreeable to the iron-base material as specified hereinafter. The thickness of the uniform layer was 0.5 to 1.0 mm.
  • the mixed joint material powder 3 of 50% copper and 50% nickel was also coated onto a powder of 96% iron, 3% molybdenum and 1% carbon. The latter iron-base powder was formed in a metal mold under a pressure of 6 t./cm.
  • Each of the above masses was then sintered at a temperature of 1150 to 1180 C. for 60 minutes in an ammonia cracked gas which met the sintering conditions for the iron-base material.
  • Each sintered mass thus obtained was put into a metal mold and covered with a copper-base mixed powder composed of 80% copper, 8% tin and 12% chromium. After pressing the copper-base material under a pressure of 6 t/cm. the copper-base material had a shape similar to the annulus 1 shown in the drawing.
  • the material was sintered at a temperature of 900 to 950 C. for minutes in a nitrogen gas under conditions agreeable to the copper-base material.
  • the twice sintered mass was again pressed under 6 t./cm. to provide an accurately sized unitary composite material 5 composed of an annulus 2 of iron-base sintered material 1, an annulus 1 of copper-base sintered material 1 and a joint material layer 3, as shown best in FIG. 3.
  • the sintered mass 5 was inserted into the cast iron head 4 of an internal combustion engine (see FIG. 4).
  • the copper-base material of the mass 5 engaged the face of the valve.
  • the internal combustion engine was run at 5,200 r.p.m. for two hours under a full load after which it was cooled. This cycle was repeated and the iron-copper sintered material of the present invention was perfect even after 50 cycles.
  • a method of combining an iron-base sintered alloy and a copper-base sintered alloy comprising coating a mixed copper and nickel powder as a bonding agent onto the joint surface of an iron-base mass, sintering the copper and nickel powder at a temperature agreeable to the iron-base mass to thereby diffuse and permeate part of the copper and nickel of the bonding agent into the ironbase mass and thereby form a rough nickel rich surface on the joint surface of the iron-base mass, abutting a formed mass of copper-base powder at the surface of the copper-nickel coating on the iron-base mass, and finally sintering the abutted masses at a temperature agreeable to the formed mass of copper-base powder to thereby diffuse part of the nickel of the copper and nickel coating of the iron-base mass into the copper-base mass whereby the masses are intensely combined together.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Powder Metallurgy (AREA)
US00191606A 1971-04-27 1971-10-22 Method of combining iron-base sintered alloys and copper-base sintered alloys Expired - Lifetime US3795511A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46033680A JPS4948060B1 (enrdf_load_stackoverflow) 1971-04-27 1971-04-27

Publications (1)

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US3795511A true US3795511A (en) 1974-03-05

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US00191606A Expired - Lifetime US3795511A (en) 1971-04-27 1971-10-22 Method of combining iron-base sintered alloys and copper-base sintered alloys

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US (1) US3795511A (enrdf_load_stackoverflow)
JP (1) JPS4948060B1 (enrdf_load_stackoverflow)
DE (1) DE2154107C3 (enrdf_load_stackoverflow)
GB (1) GB1312024A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889349A (en) * 1973-06-08 1975-06-17 Ford Motor Co Brazing metal alloys
US3977838A (en) * 1973-06-11 1976-08-31 Toyota Jidosha Kogyo Kabushiki Kaisha Anti-wear ferrous sintered alloy
US4386959A (en) * 1979-07-17 1983-06-07 Thyssen Edelstahlwerke Ag Method for compound sintering
US4509722A (en) * 1981-02-26 1985-04-09 Nippon Piston Ring Co., Ltd. Composite valve seat
US4671491A (en) * 1984-06-12 1987-06-09 Sumitomo Electric Industries, Ltd. Valve-seat insert for internal combustion engines and its production
US5060374A (en) * 1989-06-05 1991-10-29 Electric Power Research Institute, Inc. Method for fabricating a valve
US5174951A (en) * 1990-11-05 1992-12-29 Asahi Tec Corporation Method of producing a porous metal and a metal product using the same such as a catalyst carrier
US5768779A (en) * 1995-09-14 1998-06-23 Yamaha Hatsudoki Kabushiki Kaisha Method of manufacturing cylinder head for engine
US5778531A (en) * 1995-09-14 1998-07-14 Yamaha Hatsudoki Kabushiki Kaisha Method of manufacturing cylinder head for engine
CN103216288A (zh) * 2013-03-28 2013-07-24 浙江吉利汽车研究院有限公司杭州分公司 一种乙醇汽油发动机的进排气门座圈

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5194549U (enrdf_load_stackoverflow) * 1975-01-28 1976-07-29
CN107326290A (zh) * 2017-05-27 2017-11-07 苏州铭晟通物资有限公司 一种耐腐蚀锡铁材料

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889349A (en) * 1973-06-08 1975-06-17 Ford Motor Co Brazing metal alloys
US3977838A (en) * 1973-06-11 1976-08-31 Toyota Jidosha Kogyo Kabushiki Kaisha Anti-wear ferrous sintered alloy
US4386959A (en) * 1979-07-17 1983-06-07 Thyssen Edelstahlwerke Ag Method for compound sintering
US4509722A (en) * 1981-02-26 1985-04-09 Nippon Piston Ring Co., Ltd. Composite valve seat
US4671491A (en) * 1984-06-12 1987-06-09 Sumitomo Electric Industries, Ltd. Valve-seat insert for internal combustion engines and its production
US4734968A (en) * 1984-06-12 1988-04-05 Toyota Motor Corporation Method for making a valve-seat insert for internal combustion engines
US5060374A (en) * 1989-06-05 1991-10-29 Electric Power Research Institute, Inc. Method for fabricating a valve
US5174951A (en) * 1990-11-05 1992-12-29 Asahi Tec Corporation Method of producing a porous metal and a metal product using the same such as a catalyst carrier
US5768779A (en) * 1995-09-14 1998-06-23 Yamaha Hatsudoki Kabushiki Kaisha Method of manufacturing cylinder head for engine
US5778531A (en) * 1995-09-14 1998-07-14 Yamaha Hatsudoki Kabushiki Kaisha Method of manufacturing cylinder head for engine
CN103216288A (zh) * 2013-03-28 2013-07-24 浙江吉利汽车研究院有限公司杭州分公司 一种乙醇汽油发动机的进排气门座圈
CN103216288B (zh) * 2013-03-28 2015-02-11 浙江吉利汽车研究院有限公司杭州分公司 一种乙醇汽油发动机的进排气门座圈

Also Published As

Publication number Publication date
DE2154107A1 (de) 1972-11-16
DE2154107B2 (de) 1974-05-30
GB1312024A (en) 1973-04-04
DE2154107C3 (de) 1975-01-09
JPS4948060B1 (enrdf_load_stackoverflow) 1974-12-19

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