Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1983-09-23
1985-07-16
Kittle, John
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
427423, B05D 108
Patent
active
045296154
ABSTRACT:
The present invention relates to a method of producing self-supporting constructional elements by plasma-spraying onto a removable core.
Recently, there is in widespread use the method of producing constructional elements, especially of heat-resistant elements of rotary shape, by plasma-spraying of ceramic oxides onto a removable core. Existing problems in the art are caused by the slow removal of an intermediate layer, which separates the deposited constructional element material from the core, in suitable solvents, and the necessary neutralization of the produced constructional element.
These disadvantages are overcome by the method of the present invention characterized in that a core is preheated to a temperature in the range of from about 200.degree. C. to about 650.degree. C., a metallic or non-metallic intermediate layer having a thickness of about 0.1 to about 2 millimeters is deposited on the core by plasma-spraying. Afterwards, there are deposited by plasma-spraying the required layers on the intermediate layer; the required layers being of a heat-resistant ceramic oxide and forming the self-supporting constructional element. Thereafter, the core is cooled, the intermediate layer is separated from the material of the self-supporting constructional element, and the constructional element is removed from the core.
The method according to the present invention takes advantage of the thermal expansion of different materials and considerably speeds-up the production. It has special utility for the production of hollow bodies having a cylindrical or nearly cylindrical shape.
REFERENCES:
patent: 3075066 (1963-01-01), Yenni et al.
patent: 3112539 (1963-12-01), Barker
patent: 3427698 (1965-11-01), Gezewicz
patent: 3429962 (1969-02-01), Krystyniak
patent: 3717914 (1973-02-01), Baird et al.
patent: 4302482 (1981-11-01), Heck
Mash et al., Structures and Properties of Plasma Cast Materials, Metals Eng. Quarterly, Feb. 1964, pp. 18-26.
Kroupa Petr
Zverina Karel
Ceskoslovenska akademie ved
Kittle John
Seidleck James J.
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