Metal working – Method of mechanical manufacture – Utilizing transitory attached element or associated separate...
Patent
1979-01-02
1981-02-17
Gilden, Leon
Metal working
Method of mechanical manufacture
Utilizing transitory attached element or associated separate...
148131, 148 115F, 148133, 148 115R, 295262, 295264, 295272, 29530, B23P 1700, B22D 11126
Patent
active
042506107
ABSTRACT:
The hot isostatic pressure (HIP) method for densification of a metal casting which includes surface-connected discontinuities over which a coating is applied to bridge surface openings associated with the discontinuities and to prevent pressurizing fluid penetration within such discontinuities is improved through the application of a selected type of ceramic coating. Such coating is of a material which provides a substantially gas impervious ceramic coating, preferably of a thickness in the range of about 0.003-0.01", having a coefficient of thermal expansion matched with that of the casting surface to which it is applied as well as having the property of being viscous under the densification processing conditions at which the bond between the coating and the casting surface degrades. Upon cooling, the coating is easily removed from the surface of the densified casting.
REFERENCES:
patent: 3455682 (1969-07-01), Barbaras
patent: 3469976 (1969-09-01), Iler
patent: 3496624 (1970-02-01), Kerr et al.
patent: 3758347 (1973-09-01), Stalker
patent: 4104782 (1978-08-01), Veeck et al.
Schweikert Wilbur H.
Wilbers Lawrence G.
General Electric Company
Gilden Leon
Lawrence Derek P.
Rising V. K.
Sachs Lee H.
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