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Title: Synthesis of fine-grained .alpha.-silicon nitride by a combustion process

Abstract

A combustion synthesis process for the preparation of .alpha.-silicon nitride and composites thereof is disclosed. Preparation of the .alpha.-silicon nitride comprises the steps of dry mixing silicon powder with an alkali metal azide, such as sodium azide, cold-pressing the mixture into any desired shape, or loading the mixture into a fused, quartz crucible, loading the crucible into a combustion chamber, pressurizing the chamber with nitrogen and igniting the mixture using an igniter pellet. The method for the preparation of the composites comprises dry mixing silicon powder (Si) or SiO.sub.2, with a metal or metal oxide, adding a small amount of an alkali metal azide such as sodium azide, introducing the mixture into a suitable combustion chamber, pressurizing the combustion chamber with nitrogen, igniting the mixture within the combustion chamber, and isolating the .alpha.-silicon nitride formed as a reaction product.

Inventors:
 [1];  [2];  [3]
  1. San Jose, CA
  2. Danville, CA
  3. Livermore, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
867469
Patent Number(s):
4944930
Assignee:
Regents of University of California (Oakland, CA)
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
synthesis; fine-grained; alpha; -silicon; nitride; combustion; process; preparation; composites; disclosed; comprises; steps; dry; mixing; silicon; powder; alkali; metal; azide; sodium; cold-pressing; mixture; desired; shape; loading; fused; quartz; crucible; chamber; pressurizing; nitrogen; igniting; igniter; pellet; method; sio; oxide; adding; amount; introducing; suitable; isolating; formed; reaction; product; silicon powder; -silicon nitride; synthesis process; metal azide; combustion synthesis; combustion process; silicon nitride; combustion chamber; alkali metal; metal oxide; reaction product; desired shape; mixing silicon; /423/264/501/

Citation Formats

Holt, J Birch, Kingman, Donald D, and Bianchini, Gregory M. Synthesis of fine-grained .alpha.-silicon nitride by a combustion process. United States: N. p., 1990. Web.
Holt, J Birch, Kingman, Donald D, & Bianchini, Gregory M. Synthesis of fine-grained .alpha.-silicon nitride by a combustion process. United States.
Holt, J Birch, Kingman, Donald D, and Bianchini, Gregory M. Mon . "Synthesis of fine-grained .alpha.-silicon nitride by a combustion process". United States. https://www.osti.gov/servlets/purl/867469.
@article{osti_867469,
title = {Synthesis of fine-grained .alpha.-silicon nitride by a combustion process},
author = {Holt, J Birch and Kingman, Donald D and Bianchini, Gregory M},
abstractNote = {A combustion synthesis process for the preparation of .alpha.-silicon nitride and composites thereof is disclosed. Preparation of the .alpha.-silicon nitride comprises the steps of dry mixing silicon powder with an alkali metal azide, such as sodium azide, cold-pressing the mixture into any desired shape, or loading the mixture into a fused, quartz crucible, loading the crucible into a combustion chamber, pressurizing the chamber with nitrogen and igniting the mixture using an igniter pellet. The method for the preparation of the composites comprises dry mixing silicon powder (Si) or SiO.sub.2, with a metal or metal oxide, adding a small amount of an alkali metal azide such as sodium azide, introducing the mixture into a suitable combustion chamber, pressurizing the combustion chamber with nitrogen, igniting the mixture within the combustion chamber, and isolating the .alpha.-silicon nitride formed as a reaction product.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {1}
}

Patent:

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