INSULATING COATING FOR CERAMIC FIBROUS MATERIAL AND COATING PROCEDURE METHOD Russian patent published in 2001 - IPC

Abstract RU 2171794 C2

FIELD: inorganic coatings. SUBSTANCE: ceramic fibers designed for fiber-reinforced ceramic composites are coated by boron nitride with amorphous structure having general formula BSixN1+1,33x with 2 to 42 wt % of silicon, which is completely in bound state. Coating is characterized by coefficient of thermal expansion from 0.25 to 0.35% at heating to 1500 C, which imparts low adhesiveness with regard to fibrous material. Coating is applied on the latter by placing it into reactor furnace operated at uniformly distributed temperature from 1300 to 1750 C, into which gaseous nitrogen, boron, and silicon sources, in particular boron trichloride as boron source and trichlorosilane as silicon source, are introduced. Low adhesiveness allows coating to be easily detached from ceramic material. EFFECT: prevented high-temperature (up to 1500 C) oxidation and hydrolysis. 9 cl, 1 dwg, 4 tbl, 5 ex

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RU 2 171 794 C2

Authors

Douehll Majkl Brehndon

Mur Artur Uil'Jam

Dates

2001-08-10Published

1995-10-24Filed