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公开(公告)号：JPS63219563A
公开(公告)日：1988-09-13
申请号：JP5434587
申请日：1987-03-10
Applicant: TOYOTA MOTOR CORP
Inventor： OISHI SHINJI , MIYAKE JOJI , KOYAMA HARATSUGU , KAKIHARA KENJI , OZAWA MAKOTO , ICHIKAWA SHIGERU
Abstract: PURPOSE:To prevent deterioration in frictional resistance at a sliding surface, by thermally spraying a wear-resistant and heat-resisting metallic material on the sliding surface of a disk rotor body and by applying reduction treatment to the above body so as to reduce the amount of oxide in the thermally sprayed layer to a specific value or below. CONSTITUTION:A wear-resistant and heat-resisting metallic material is thermally sprayed on the sliding material 2, with which a brake friction pad is to be brought into contact, of a disk rotor body 1 composed of Al alloy, cast iron, etc., so as to form a thermally sprayed layer 3. Further, a coppery or ferrous material is mainly used as the above thermal spraying material, and thermal spraying is carried out by means of a wire gas thermal spraying method, a wire arc thermal spraying method, etc. Subsequently, the above-mentioned disk rotor body is subjected to reduction treatment in a hydrogen air flow in a reducing furnace. By this reduction treatment, the amount of oxide contained generally by >=about 10% in the above thermally sprayed layer 3 is reduced to
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公开(公告)号：JPS63183162A
公开(公告)日：1988-07-28
申请号：JP1381087
申请日：1987-01-23
Applicant: TOYOTA MOTOR CORP
Inventor： KOYAMA HARATSUGU , MIYAKE JOJI , OISHI SHINJI
Abstract: PURPOSE:To freely change the mixing and compounding ratio between dissimilar materials, by constituting a thermal spraying wire of a stranded wire consisting of >=3 pieces of hollow wire and also by filling respective hollow parts of one of more pieces of the hollow wire with a wire dissimilar to the hollow wire. CONSTITUTION:For example, a thermal spraying wire 1 is formed as a stranded wire by using three pieces of hollow copper wire 2, e.g., of pure copper having about 3.2mm outside diameter and about 2.4mm inside diameter and four pieces of copper - stainless steel wire 4 prepared by filling the hollow part of the above copper wire 2 with stainless steel wire 3, e.g., SUS316 by JIS. When this thermal spraying wire 1 is thermally sprayed on the surface of a steel sheet 5 as a base material, e.g., JIS-S45C, by an arc thermal spraying method, a mixed and compounded thermally sprayed layer in which respective thermally sprayed and laminated grains 3a and 2a of the stainless steel wire 3 and the copper wire 2 are laminated in the ratio of 1 to 3 can be formed. Accordingly, by changing respective numbers of the stainless steel wire 3 and the copper wire 2, the mixing and compounding ratio between both can be changed.
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公开(公告)号：JPS63169371A
公开(公告)日：1988-07-13
申请号：JP31565786
申请日：1986-12-29
Applicant: TOYOTA MOTOR CORP
Inventor： TOMOTA TAKASHI , MIYAMOTO NORITAKA , KOYAMA HARATSUGU
Abstract: PURPOSE:To thermal-spray SiC or Si3N4 by thermal-spraying the material obtained by depositing a low-m.p. oxide-based ceramic on the surfaces of the particles of ceramics such as SiC and Si3N4 at the time of forming the title thermal-spraying ceramic layer of the SiC, Si3N4, etc., having excellent hardness and resistance to heat and wear on the surface of a substrate. CONSTITUTION:The thermal-spraying ceramic layer of the carbide and nitride such as SiC and Si3N4 having excellent hardness and resistance to heat and wear is formed on the surface of the parts of an internal-combustion engine such as a piston to be slid at high temp. In this case, a substrate thermal- spraying layer 5 of an alloy such as Ni-Al and Ni-Cr having a thermal expansion coefficient intermediate to those of a base material 1 of an Al alloy, etc., and the above-mentioned ceramic is formed on the surface of the base material 1. The material obtained by depositing the fine powder of the oxide-based ceramic such as Al2O3 and spinel on the powder of SiC or Si3N4 having the higher m.p. than the ceramic is thermal-sprayed thereon. When the Al2O3 8, etc., are melted and resolidified, the powder 7 of SiC or Si3N4 having a high m.p. and easy to sublimate is bound, and the thermal-spraying layer 6 of SiC or Si3N4 can be formed on the substrate layer 5 with excellent adhesive strength.
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公开(公告)号：JPS6360270A
公开(公告)日：1988-03-16
申请号：JP20272286
申请日：1986-08-30
Applicant: TOYOTA MOTOR CORP
Inventor： SHIMODA KENJI , TOMOTA TAKASHI , KOYAMA HARATSUGU
Abstract: PURPOSE:To prevent occurrence of nonformed parts to a hard film and also to prevent occurrence of flaws such as crack, fracturing, etc., by previously chilling the surface of a cast iron and then by forming a hard film at the time of forming a hard film of TiC, TiN, etc., on the surface of a cast iron so as to improve wear resistance. CONSTITUTION:In order to improve wear resistance at least in a part of the surface of machine parts made of cast iron, a layer of hard ceramics such as TiC, TiN, etc., is formed by a CVD or PVD method. At this time, cracking and fracturing occur to the hard ceramic layer when the cast iron it self, as a substrate, is soft and, moreover, there are cases where local nonformation of hard ceramic layer occurs to the graphite part at the surface of the cast iron. For the purpose of removing the above defects, the required part of the cast iron 1 is previously subjected to remelting by means of laser, electron beam, plasma arc, etc., and the to solidification by rapid cooling to undergo formation of a chilled layer 2, on which the hard ceramic layer 3 of TiC, TiN, etc., is formed by means of an ion plating method, a plasma CVD method, etc.
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公开(公告)号：JPS6333517A
公开(公告)日：1988-02-13
申请号：JP17347786
申请日：1986-07-23
Applicant: TOYOTA MOTOR CORP
Inventor： KOYAMA HARATSUGU , MIYAKE JOJI , OISHI SHINJI , KANAZAWA TAKAAKI
Abstract: PURPOSE:To prevent the development of cracking by remelting chill treatment by forming a primary chilled layer having the specific graphite crystallization rate by irradiating high density energy on the cast iron surface and further forming a thin secondary chilled layer by irradiating high density energy on this chilled layer. CONSTITUTION:The prescribed part of cast iron base material 1 is irradiated by the high density energy 2, such as TIG arc, etc., and so the surface layer of base material 1 is remelted and resolidified, to form the primary chilled layer 3 having 10-50% area ratio as the graphite crystallization rate. Next, in the region of the primary chilled layer 3, the surface is again irradiated by the high density energy 2 and the thiner part than the primary chilled layer 3 in the region of the primary chilled layer 3, is remelting and resolidified, to form the secondary chilled layer 4 having
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Patent Agency Ranking
公开(公告)号：JPS62297454A
公开(公告)日：1987-12-24
申请号：JP13870386
申请日：1986-06-14
Applicant: TOYOTA MOTOR CORP
Inventor： KANAZAWA TAKAAKI , MIYAKE JOJI , KOYAMA HARATSUGU , OISHI SHINJI
IPC: C23C10/28
Abstract: PURPOSE:To provide improved resistance to corrosion by formic acid necessary for a methanol-fueled engine to a cast iron base material by forming an Fe-Si alloyed layer having a prescribed concn. of Si on the surface of the base material. CONSTITUTION:An Si coating layer is formed on the surface of a cast iron base material by thermally spraying Si powder on the surface. The coating layer and a part of the base material are then melted by projecting high density energy such as laser beams or electron beams to alloy a part of the cast iron with the coating component. The average concn. of Si in the resulting alloyed layer is regulated to 10-20wt%.
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公开(公告)号：JPS62170487A
公开(公告)日：1987-07-27
申请号：JP1087086
申请日：1986-01-21
Applicant: TOYOTA MOTOR CORP
Inventor： KANAZAWA TAKAAKI , MIYAKE JOJI , KOYAMA HARATSUGU
Abstract: PURPOSE:To obtain a piston having partially improved resistance to thermal impact and thermal fatigue by forming an alloyed cast iron layer in which Ni is incorporated at a specific ratio and block graphite is crystallized and dispersed to the prescribed section in the piston head part of the cast iron piston down to an adequate depth. CONSTITUTION:Ni or Ni-Fe alloy is disposed onto the surface in the section such as hot spot part 4 at the peripheral edge of a recessed ejection port 3, etc. in the piston head part 2 of the cast iron piston 1 and high-density energy such as laser is irradiated thereon from above. The Ni, etc., disposed on the surface and the base material surface layer made on cast iron thereunder are thereby quickly melted and quickly solidifed. The alloyed cast iron layer which contains 10-60wt% Ni and has the matrix consisting of austenite or essentially consisting of austenite and in which the block graphite is uniformly dispersed and crystallized is thereby formed into the above-mentioned hot spot part 4 down to >=0.2mm depth from the surface and the cast iron piston having the improved resistance to thermal impact and thermal fatigue in said section for an internal combustion engine is obtd.
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公开(公告)号：JPS62170486A
公开(公告)日：1987-07-27
申请号：JP1086986
申请日：1986-01-21
Applicant: TOYOTA MOTOR CORP
Inventor： KANAZAWA TAKAAKI , MIYAKE JOJI , KOYAMA HARATSUGU
Abstract: PURPOSE:To simply and easily produce an inexpensive piston having excellent resistance to thermal impact and thermal fatigue by disposing Al or Si to the prescribed section of the cast iron piston and irradiating high-density energy thereto, then subjecting said section to an adequate reheating treatment. CONSTITUTION:The Al and/or Si or the alloy thereof or the alloy with Fe is disposed on the surface of the section in the piston heat part of a rough shape material for the cast iron piston where the resistance to thermal impact and thermal fatigue is required. The high-density energy such as TIG arc is then irradiated thereon from above to form the alloy layer of the cast iron and the Al and/or Si by quick melting-quick resolidifying. The alloy layer is thereafter subjected to the reheating treatment for 1min-3hr at 800-1,100 deg.C. The alloyed cast iron layer in which the Al and/or Si is incorporated at 0.1-10wt% and fine block graphite is dispersed and crystallized is thereby forming to the above-mentioned section down to >=0.2mm depth from the surface and the cast iron piston having the partially improved resistance to thermal impact and thermal fatigue for an internal combustion engine is obtd.
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公开(公告)号：JPS61170578A
公开(公告)日：1986-08-01
申请号：JP1147185
申请日：1985-01-23
Applicant: TOYOTA MOTOR CORP
Inventor： KANAZAWA TAKAAKI , MIYAKE JOJI , KOYAMA HARATSUGU
Abstract: PURPOSE:To improve heat resistance of the desired surface part of Al alloy member, by alloying said part with Fe, to form composite layer, composed of a specified ratio of Fe-Al intermetallic comps. in Al alloy matrix. CONSTITUTION:Pure iron or Fe-Al mother alloy is covered by thermal spraying method, plating method, etc., on the surface of a part requiring heat resistance in part made of al alloy. High density energy such as TIG arc, laser beam, electron beam is irradiated to the part to melt Al alloy base material and covered pure iron or Fe-Al mother alloy simultaneously to alloy them. At alloying, average Fe concn. in composite layer as alloyed layer is regulated to 3-38wt% range, intermetallic compds. such as FeAl3, Fe2Al5 are pptd., mixed and made composite in Al alloy matrix layer to improve heat resistance of the part remarkably.
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公开(公告)号：JPS6154932A
公开(公告)日：1986-03-19
申请号：JP17873484
申请日：1984-08-27
Applicant: Toyota Motor Corp
Inventor： KOYAMA HARATSUGU , MIYAKE JOJI , TOMOTA TAKASHI , OISHI SHINJI , KANAZAWA TAKAAKI
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