Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1997-12-30
1999-08-31
Beck, Shrive
Coating processes
With post-treatment of coating or coating material
Heating or drying
42725512, 427380, 427387, 4274197, 4274198, 427427, 427431, 4274432, B05D 302, B05D 102, B05D 118, B05D 138
Patent
active
059451661
ABSTRACT:
A near-net, complex shaped ceramic fiber reinforced silicon carbide based composite bodies with graded compositions and stress zones is disclosed. To provide the composite a fiber preform is first fabricated and an interphase is applied by chemical vapor infiltration, sol-gel or polymer processes. This first body is further infiltrated with a polymer mixture containing carbon, and/or silicon carbide, and additional oxide, carbide, or nitride phases forming a second body. One side of the second body is spray coated or infiltrated with slurries containing high thermal expansion and oxidation resistant, crack sealant phases and the other side of this second body is coated with low expansion phase materials to form a third body. This third body consisting of porous carbonaceous matrix surrounding the previously applied interphase materials, is then infiltrated with molten silicon or molten silicon-refractory metal alloys to form a fourth body. The resulting fourth body comprises dense composites consisting of fibers with the desired interphase which are surrounded by silicon carbide and other second phases materials at the outer and inner surfaces comprising material of silicon, germanium, refractory metal suicides, borides, carbides, oxides, and combinations thereof. The resulting composite fourth body has different compositional patterns from one side to the other.
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Levine Stanley R.
Singh Mrityunjay
Smialek James A.
Barr Michael
Beck Shrive
Stone Kent N.
The United States of America as represented by the Administrator
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