Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1994-09-27
1997-08-26
Dean, Karen A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524862, 525478, 528 15, 528 31, 528 32, C09K 2114, C08L 8304, C08G 7706
Patent
active
056611986
ABSTRACT:
The invention relates to an ablator composition for providing ablation protection. The ablator composition comprises 100 parts by weight of a mixture of vinyl-containing organopolysiloxanes, the mixture containing 50-80 wt. % of a diorganopolysiloxane which contains vinyl groups and 20-50 wt. % of a silicone resin which contains vinyl groups; an organohydrogenpolysiloxane containing in one molecule thereof at least three hydrogen atoms which are directly bonded to silicon atoms thereof; a catalyst which is at least one selected from the group consisting of metallic platinum and platinum compounds; up to 150 parts by weight of silica microballoons; and at least one selected from the group consisting of up to 15 parts by weight of quartz glass fibers and up to 15 parts by weight of carbon fibers. An ablator material prepared by curing the ablator composition has a low surface recession rate even under a condition of a high heating rate such as about 4 MW/m.sup.2 and a high pressure such as about one atmospheric pressure.
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"Revised Handbook of Aeronautics and Astronautics", Apr. 25, 1983, p. 242.
Fujiki Hironao
Harada Tadashi
Inatani Yoshifumi
Kawasaki Kazunori
Shiono Mikio
Dean Karen A.
Inatani Yoshifumi
Nissan Motor Co,. Ltd.
Shin-Etsu Chemical Co. , Ltd.
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