Method of making a radar transparent window material operable above 2000.degree. C.
AssigneeLoral Vought Systems Corporation
InventorDavid G. Paquette
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Abstract
A method is disclosed for making a microwave radar transparent window material operable at temperatures above 2000.degree. C., and which material possesses high tensile strength, is resistant to .erosion as well as particle impact at such temperatures, and is highly machinable. The method comprises: blending a powder mixture of 20-60% by weight silicon nitride, 12-40% boron nitride, 15-40% boron nitride, 15-40% silica, and 1-20% oxygen carrying sintering aids; (b) molding the mixture to shape as a preform; and (c) densifying the shaped preform into a monolithic window having high temperature stability and transparency at high temperatures.
Claims8
A method of making a microwave radar transparent window material operable at temperatures above 2000.degree. C., comprising:
- (a) blending a powder mixture of 20-60% by weight silicon nitride, 12-40% boron nitride, 15-40% SiO.sub.2, and 1-20% oxygen carrying sintering aids;
- (b) molding said mixture to shape a preform;
- and
- (c) densifying the thus shaped preform by simultaneous application of heat and pressure to form a monolithic window.
Dependencies are inferred from the claim text.