Title: Hydridosiloxanes as precursors to ceramic products

Abstract

A method is provided for preparing ceramic precursors from hydridosiloxane starting materials and then pyrolyzing these precursors to give rise to silicious ceramic materials. Si--H bonds present in the hydridosiloxane starting materials are catalytically activated, and the activated hydrogen atoms may then be replaced with nonhydrogen substituents. These preceramic materials are pyrolyzed in a selected atmosphere to give the desired ceramic product. Ceramic products which may be prepared by this technique include silica, silicon oxynitride, silicon carbide, metal silicates, and mullite.

Inventors:

Blum, Yigal D ^[1]; Johnson, Sylvia M ^[2]; Gusman, Michael I ^[3]

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+ Show Inventor Affiliations

1. San Jose, CA
2. Piedmont, CA
3. Palo Alto, CA

Issue Date:

1997-01-01

OSTI Identifier:

870979

Patent Number(s):

5635250

Assignee:

SRI International (Menlo Park, CA)

Patent Classifications (CPCs):

C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

C - CHEMISTRY C08 - ORGANIC MACROMOLECULAR COMPOUNDS C08G - MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

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C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

C04B35/14 - based on silica
C04B35/16 - based on silicates other than clay {
C04B35/185 - Mullite {3Al2O3-2SiO2}
C04B35/565 - based on silicon carbide
C04B35/571 - obtained from {Si-containing} polymer precursors {or organosilicon monomers}
C04B35/597 - based on silicon oxynitride, {e.g. SIALONS}
C04B35/634 - Polymers
C04B41/009 - {characterised by the material treated}
C04B41/4554 - {the coating or impregnating material being an organic or organo-metallic precursor of an inorganic material}
C04B41/5024 - {Silicates
C04B41/5025 - {with ceramic materials
C04B41/5035 - {Silica}
C04B41/5059 - {Silicon carbide}
C04B41/5067 - {Silicon oxynitrides, e.g. SIALON}
C04B41/51 - Metallising {, e.g. infiltration of sintered ceramic preforms with molten metal
C04B41/81 - Coating or impregnation

C - CHEMISTRY C08 - ORGANIC MACROMOLECULAR COMPOUNDS C08G - MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

C08G77/38 - Polysiloxanes modified by chemical after-treatment {
C08G77/398 - containing boron or metal atoms
C08G77/54 - Nitrogen-containing linkages {
C08G79/00 - Macromolecular compounds obtained by reactions forming a linkage containing atoms other than silicon, sulfur, nitrogen, oxygen, and carbon {with or without the latter elements in the main chain of the macromolecule}

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DOE Contract Number:  

N00014-85C-0668

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

hydridosiloxanes; precursors; ceramic; products; method; provided; preparing; hydridosiloxane; starting; materials; pyrolyzing; rise; silicious; si-h; bonds; catalytically; activated; hydrogen; atoms; replaced; nonhydrogen; substituents; preceramic; pyrolyzed; selected; atmosphere; desired; product; prepared; technique; silica; silicon; oxynitride; carbide; metal; silicates; mullite; ceramic products; ceramic product; hydrogen atoms; starting material; ceramic material; silicon carbide; ceramic materials; starting materials; ceramic precursor; hydrogen atom; silicon oxynitride; selected atmosphere; preparing ceramic; ceramic mater; /427/501/