Method of making a radar transparent window material operable ab

Details Method of making a radar transparent window material operable ab Method of making a radar transparent window material operable ab

1985-12-23

1997-05-06

Nelson, Peter A.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Utilizing diverse solid particles

264 56, 264125, 264668, 501 97, 501 98, 342 4, H01Q 1700, C04B 3564

Patent

active

056275420

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.

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