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1. 发明专利

JPH10152766A PLASMA SPRAYING TORCH 失效
公开(公告)号：JPH10152766A
公开(公告)日：1998-06-09
申请号：JP31481496
申请日：1996-11-26
申请人： MITSUBISHI HEAVY IND LTD
发明人： NOTOMI HIROSHI , TAKEDA YASUYUKI
IPC分类号： B05D1/08 , C23C4/12
摘要： PROBLEM TO BE SOLVED: To solve the problems that, in the conventional plasma spraying torch, the flying locus of powder grains is regulated, e.g. by changing the size of a powder feeding port and the flow rate of a powder feeding gas, but, it is not effective in actual fact, and the problems that the sticking efficiency of a thermal spraying material is low, the quality of coating is unstable or the like occur, and, at the time of using the plasma spraying torch, the consumption of the anode and cathode occurs to change the shape of a plasma jet, therefore, the reregulation of the proper flying locus is needed, but, in the conventional plasma spraying torch, such regulation has been impossible. SOLUTION: In a plasma spraying torch in which the powder grains of a thermal spraying material are fed to the flow of a plasma jet sprayed from an anode nozzle hole 21a by arc discharge from a powder feeding port 26 provided on the upstream or downstream side of the anode nozzle hole 21a, the powder feeding port 26 is provided freely retrogressingly in the axial direction and movably in the approximately orthogonal direction to the flow of the plasma jet.

2. 发明专利

JPH09257190A SURFACE TREATMENT OF BOILER TUBE 失效
公开(公告)号：JPH09257190A
公开(公告)日：1997-09-30
申请号：JP6989896
申请日：1996-03-26
申请人： MITSUBISHI HEAVY IND LTD
发明人： MATSUMOTO HIROTOSHI , TAKEDA YASUYUKI , NISHI FUMIO
IPC分类号： C23C10/48 , F16L58/08
摘要： PROBLEM TO BE SOLVED: To dispense with the protector installing stage, to obtain a hard sur face layer, and to avoid erosion by conducting simultaneously an annealing treatment and an aluminizing diffusing/penetrating treatment at the completion of bending work to a boiler tube whose surface is coated with an aluminum layer. SOLUTION: A boiler tube is aluminized through the hot dipping method, then it undergoes bending work, and it receives an annealing treatment and an aluminizing diffusing/penetrating treatment after the bending work. In the aluminizing diffusing/penetrating treatment, an aluminum diffused layer is formed between the surface film layer of the boiler tube through the treatment of 30 minutes in the atmosphere of 900 deg.C, and the diffused layer is given the hardness as twice as that of the mother metal. Since the stress relief annealing to austenic stainless steel is carried out for two to four hours at the temperature of 850 to 900 deg.C, the aluminizing diffusing/penetrating treatment and the stress relief annealing can be carried out at the same time. Accordingly, the manufacturing process can be simplified, the installation stage for the protector can be dispensed with, and the manufacturing cost can be reduced.

3. 发明专利

JPH08167497A PLASMA SPRAYING TORCH 失效
公开(公告)号：JPH08167497A
公开(公告)日：1996-06-25
申请号：JP30748294
申请日：1994-12-12
申请人： MITSUBISHI HEAVY IND LTD
发明人： TAKEDA YASUYUKI , NOTOMI HIROSHI
IPC分类号： H05H1/42 , C23C4/00
摘要： PURPOSE: To provide stabilized plasma, uniformized heating and accelerating of particles, and high quality sprayed coating formed with less energy used, by supplying spray powder longitudinally from a base part of a plasma jet passage in a positive electrode. CONSTITUTION: Cooling water is passed through cooling water passages 10, 12 in order to cool a positive electrode 1 and a negative electrode 5, while Ar or the like is passed, via a mixing passage 7 for spray powder and a working gaseous medium, from a hole formed in the negative electrode 5 to a plasma chamber 'a'. Spark discharge is generated between the two electrodes 1, 5, by applying a positive voltage and a negative voltage to the positive electrode 1 and the negative electrode 5 respectively from a direct current power source and also by applying a high-frequency voltage between the positive electrode 1 and the negative electrode 5. Owing to this spark discharge, plasma is generated between the positive electrode 1 and the negative electrode 5, and a plasma jet of high temperature and high speed bursts out of a plasma-jet nozzle 'b'. After the plasma has become stable, spray powder is supplied from a spray-powder supply passage 8 to the plasma generating chamber. Because the powder is supplied in the same direction as the bursting direction of the plasma jet, heating and accelerating of particles are uniformized.

4. 发明专利

JPS60187360A PLASMA SPRAY GUN 失效
公开(公告)号：JPS60187360A
公开(公告)日：1985-09-24
申请号：JP4296284
申请日：1984-03-08
申请人： MITSUBISHI HEAVY IND LTD
发明人： NOUTOMI HIROSHI , TAKEDA YASUYUKI
IPC分类号： B05B7/22
摘要： PURPOSE:To raise the temp. of sprayed plasma particles sufficiently and to accelerate the particles by providing a feeding hole of the material to be sprayed communicating with a plasma space and extending prallelly to the direction of plasma jet, to a cathode. CONSTITUTION:A hole 206 for feeding a material to be sprayed penetrating from one end of the hole through the cathode 201 and opening at a plasma space 202 with another end of the hole extending in the parallel direction to the plasma jet through a conductor 208 and opening at a side of a hopper for the material to be sprayed, is formed in the axial center of a conductor 208. By this constitution, particles to be sprayed are sent to a space adjacent to a position generating plasma jet, therefore, the particles are heated to sufficiently high temp. and accelerated to aquire high energy.

5. 发明专利

JPH10310859A METHOD FOR TREATING SURFACE OF HARD INORGANIC MATERIAL 失效
公开(公告)号：JPH10310859A
公开(公告)日：1998-11-24
申请号：JP13454697
申请日：1997-05-09
申请人： NAT SPACE DEV AGENCY , MITSUBISHI HEAVY IND LTD
发明人： MIHO KAZUYUKI , TSUZUKI KEIKI , FUJIWARA TSUTOMU , SEKIKAWA TAKAHIRO , NOTOMI HIROSHI , TAKEDA YASUYUKI , MORIMOTO TATSUO , OGURA KEN , KONDO MASAYUKI
IPC分类号： C23C4/02 , C04B41/00 , C04B41/50 , C23C4/10
摘要： PROBLEM TO BE SOLVED: To execute efficient and uniform roughening free from deterioration in the characteristics of the material to be applied with coating by executing roughening treatment using a laser beam to the surface of a hard inorganic material as a surface layer, particularly, on the surface of a material with a crystal structure having covalent bondability to form coating by a thermal spraying method. SOLUTION: Prior to the formation of coating on a surface layer composed of a hard inorganic material, the surface of the material to be subjected to coating (hard inorganic material) is subjected to roughening treatment. In accordance with the degree of the objective roughening, the spot diameter, focal distance, pulse frequency or the like of a laser beam 5 are regulated, which is applied to the surface layer 2 of the material to be subjected to coating, and boring or grooving is executed. Substantially, it is applied to the one in which a surface layer composed of a hard inorganic material such as Sic, TiC, TiN, HfC or the like is formed on a material composed of a hard inorganic material such as Sic, TiC, HfC or the like, or a WC/C composite material or a base material such as graphite or the like.

6. 发明专利

JPH10251826A CORROSION RESISTANT AND WEAR RESISTANT COATED MATERIAL AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH10251826A
公开(公告)日：1998-09-22
申请号：JP5752597
申请日：1997-03-12
申请人： MITSUBISHI HEAVY IND LTD
发明人： MATSUMOTO HIROTOSHI , NOTOMI HIROSHI , TAKEDA YASUYUKI , TSUNODA HIDEO
IPC分类号： C23C4/04 , C23C4/18
摘要： PROBLEM TO BE SOLVED: To obtain a corrosion resistant and wear resistant coating material excellent in the stickiness between a base material and a thermal-sprayed film regardless of whether the Al content exists or not in the thermal sprayed film material by forming the Al diffused layer in the joined part between the base material and the thermal- sprayed film, in the coating material forming the thermal-sprayed film of a metal or a cermet having the corrosion resistance and the wear resistance on the surface of the base material composed of metallic material. SOLUTION: Solid solution is formed by diffusing Al to both of the base material 1 and the thermal-sprayed film 2 and the Al diffused layer 3 mixed with the base material, thermal-spraying material and Al is formed, and the thermal-sprayed film 2 and the base material 1 are metallurgically combined. This coating material is obtd. by forming the Al film on the surface of the base material 1 and executing the heat treatment after forming the metallic or the cermet thermal sprayed film having the corrosion resistance and the wear resistance on this Al film to diffuse the Al into the base material and the thermal-sprayed film. As the material of the thermal-sprayed film, metal powder such as SUS 310, etc., without containing Al, is recomended.

7. 发明专利

JPH10245288A SILICON CARBIDE MATERIAL WITH HIGH EMISSIVITY ANTIOXIDANT COAT AND ITS PRODUCTION 失效
公开(公告)号：JPH10245288A
公开(公告)日：1998-09-14
申请号：JP5308097
申请日：1997-03-07
申请人： MITSUBISHI HEAVY IND LTD
发明人： SEKIKAWA TAKAHIRO , TSUZUKI KEIKI , FUJIWARA TSUTOMU , KONDO MASAYUKI , OGURA KEN , MORIMOTO TATSUO , NOTOMI HIROSHI , TAKEDA YASUYUKI
IPC分类号： B64G1/58 , C04B41/52 , C04B41/87 , C04B41/89
摘要： PROBLEM TO BE SOLVED: To improve a surface emissivity without markedly deteriorating the antioxidative properties of a silicon carbide material by applying an composite oxide containing a lanthanoid-based rare earth element and chromium to the surface of a silicon carbide material coated with an oxide of the lanthanoid- based rate earth element or a complex oxide of the lanthanoid-based rate earth element and silicon. SOLUTION: This silicon carbide material coated with a coat containing high emissivity lanthanoid-based rate earth element oxide is obtained by applying complex oxide 3 containing the lanthanoid-based rare earth element (with the proviso that Y is included) and chromium to the surface of a silicon carbide material 11 coated with the oxide of the lanthanoid-based rate earth element (with the proviso that Y is included) or a complex oxide 2 of the lanthanoid- based rate earth element (with the proviso that Y is included) and silicon. The composition of the complex oxide of the rate earth element and the chromium is 40-50mol% oxide of the lanthanoid-based rare earth element and 35-60mol% chromium oxide,

8. 发明专利

JPH10195627A ARC THERMAL SPRAYING METHOD AND DEVICE THEREOF 失效
公开(公告)号：JPH10195627A
公开(公告)日：1998-07-28
申请号：JP1343597
申请日：1997-01-09
申请人： MITSUBISHI HEAVY IND LTD
发明人： FUJIMURA HIROSHI , IDE EIZO , NOTOMI HIROSHI , TAKEDA YASUYUKI , KOBAYASHI HIDEHARU
IPC分类号： H05H1/42 , C23C4/12
摘要： PROBLEM TO BE SOLVED: To stably keep an arc by focusing three or more pieces of wires at the arc generating position and supplying three phase AC to at least three pieces of wires so as to generate the arc between at least two pieces of wires. SOLUTION: Angle positions of electricity supplying tips 20, 21, 22 are set so as to focus/cross the wires 70, 71, 72 on the extending line of a spouting pipe 6, i.e., on the extending line of the center axis of a mount 11. In this constitution, the arcs among three wires 70, 71, 72 with the three phase AC from the electric source 9 are repeatedly extinguished and reignited in order, but in any point of time, two or more arcs exist and since the wires 70, 71, 72 are acted as the electrodes in all pieces, the necessary temp. to discharge heat electron is held. Since ionized gas is always supplied from the neighbor arc, reignition of the arc is extremely smoothly executed. Even the flow rate of compressed gas is increased, the stable thermal-spraying can be continued without interrupting the arc.

9. 发明专利

JPH07316774A LOW-PRESSURE PLASMA THERMAL SPRAYING METHOD 失效
公开(公告)号：JPH07316774A
公开(公告)日：1995-12-05
申请号：JP21711994
申请日：1994-09-12
申请人： MITSUBISHI HEAVY IND LTD
发明人： NOTOMI HIROSHI , TAKEDA YASUYUKI , TSUKUDA HIROSHI , KODAMA KATSU
IPC分类号： C23C4/12
摘要： PURPOSE:To obtain a thermally sprayed film having good quality by sufficiently executing melting of thermally sprayed powder particles with high adhesion efficiency. CONSTITUTION:While the atmosphere pressure is kept under 20 to 500Torr, a plasma jet 25 to be injected from a plasma thermal spraying torch 22 toward a base material 23 is formed and, thereafter, the thermally sprayed powder particles 24 are supplied into the plasma jet 25 via a powder supplying pole 22a' penetrating the axial center of a cathode 22a of the plasma thermal spraying torch 22, by which the plasma jet 25 is formed with adequate spread and, therefore, uniform heating and accelerating of the thermally sprayed powder particles 24 are made possible. Since the thermally sprayed powder particles 24 are supplied along the injection direction of the plasma jet 25, the efficient heating and accelerating are made possible. Thus thermally sprayed films having excellent wear resistance, corrosion resistance and oxidation resistance are obtd. and the deposition efficiency of the thermally spraying material is improved. Shortening of the working stages and the reduction of material cost are made possible.

10. 发明专利

JPH07316771A THERMAL SPRAY MATERIAL 失效
公开(公告)号：JPH07316771A
公开(公告)日：1995-12-05
申请号：JP11828594
申请日：1994-05-31
申请人： MITSUBISHI HEAVY IND LTD
发明人： NOTOMI HIROSHI , TAKEDA YASUYUKI
IPC分类号： C23C4/06 , C22C38/00 , C22C38/26
摘要： PURPOSE:To produce a thermal spray material for high temp. resisting wear coating at a cost lower than heretofore by preparing a thermal spray material having a compsn. contg. specified ratios of Fe, C, Cr, Mo, V and Nb and in which the content of grains with specified grain size is prescribed. CONSTITUTION:A thermal spray material having a compsn. contg., by weight, 5.0 to 6.5% C, 25 to 35% Cr, 5 to 15% of one or more kinds among Mo, V and Nb, and the balance Fe with inevitable impurities, and in which the content of grains with >=50mum grain size is regulated to

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