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公开(公告)号：CA1161314A
公开(公告)日：1984-01-31
申请号：CA348289
申请日：1980-03-24
Applicant: UNITED TECHNOLOGIES CORP
Inventor： SOKOL LARRY S , MCCOMAS CHARLES C , HANNA EARL M
Abstract: PLASMA SPRAY METHOD AND APPARATUS A plasma spray method capable of directing plasticized powders against a substrate for deposition of a protective coating thereon is disclosed. Various structural details of the apparatus described enable the attainment of high particle velocities without melting the particles. The technical concepts employed are directed to normalizing the temperature of the plasma stream at a reduced value prior to the injection of coating particles. A general reduction in temperature and substantial elimination of a thermal spike at the core of the stream are achieved. Coating particles are injected into the plasma stream only after the plasma is first cooled and then accelerated. In detailed embodiments, a nozzle extension assembly having a plasma cooling zone, a plasma acceleration zone, a powder injection zone and a plasma/powder discharge zone is affixed to the downstream end of a conventional plasma generator. F-4451
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公开(公告)号：CA1065203A
公开(公告)日：1979-10-30
申请号：CA237226
申请日：1975-10-07
Applicant: UNITED TECHNOLOGIES CORP
Inventor： MCCOMAS CHARLES C , SOKOL LARRY S , HANNA EARL M
Abstract: Thermal spray apparatus incorporating a cooled nozzle extension features high particle velocities and a precise particle temperature control capability produces high quality coatings in a simple and economical manner.
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公开(公告)号：CA1168477A
公开(公告)日：1984-06-05
申请号：CA362144
申请日：1980-10-10
Applicant: UNITED TECHNOLOGIES CORP
Inventor： MCCOMAS CHARLES C , MORRIS JAMES W , SOKOL LARRY S
Abstract: A protectively coated superalloy has improved oxidation, corrosion, and wear resistance at elevated temperatures. The protective coating is a MCrAlY type alloy having a carbon content of 0.6 to 11 percent and is characterized in a preferred embodiment by having a carbon bearing matrix containing metal carbides of 1-2 microns mean size and chromium carbides of less than 12 microns. The coating is preferably produced by plasma spraying and heat treatment. This method involves applying a wear resisting MCrAlY coating by plasma spraying a mixture of MCrAlY and Cr3C2 powders to form a coating having both fine carbides and coarser Cr3C2 carbides in an MCrAlY matrix. Heat treatment at 1080.degree.C after coating bonds the substrate and coating and forms further fine carbides. The coating desirably consists of by weight percent 18-80 Cr, 1.2-29 Al, up to 4.8 Y, 0.6-11 C, balance selected from the group consisting of Ni, Co, Fe, or mixtures thereof.
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公开(公告)号：CA1162796A
公开(公告)日：1984-02-28
申请号：CA347540
申请日：1980-03-12
Applicant: UNITED TECHNOLOGIES CORP
Inventor： MCCOMAS CHARLES C , SOKOL LARRY S
IPC: B32B15/04 , B23K35/24 , B32B9/00 , B32B18/00 , C04B35/76 , C04B37/02 , C04B41/70 , C23C4/00 , C23C4/02 , C23C4/04 , C23C4/10 , E04B1/94 , F01D5/28 , F01D11/12 , F01D25/08 , F02C7/00 , F02C7/24 , F02C7/28 , F23R3/42
Abstract: CERAMIC FACED STRUCTURES AND METHODS FOR MANUFACTURE THEREOF A method of adhering a ceramic facing material to an underlying substrate is disclosed. Substrates to which the concepts apply include unsupported low modulus, porous wire pads as well as low modulus, porous wire pads backed by a solid metallic form. The ceramic application techniques employed are centered around the impregnation of the regions of the pad to be ceramic coated with an underlayment coating, such as MCrAlY material. Deep penetration of the underlayment material into the pad is achieved with a high velocity, spraying process. Ceramic material is applied over the underlayment material by conventional spraying techniques. Articles of manufacture which are suited to fabrication in accordance with the concepts disclosed herein include, but are not limited to, outer air seals, combustion chambers, and airfoils of gas turbine engines. F-4294
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