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Synthesis of chromium silicide-silicon carbide composite powders

✍ Scribed by Ping Luo; Peter R. Strutt; Tongsan D. Xiao


Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
601 KB
Volume
17
Category
Article
ISSN
0921-5107

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✦ Synopsis


A special class of materials of interest to the electronic industry are the intermetallic matrix composites, containing phases such as chromium silieide and silicon carbide. Our studies address this need by investigating a low cost method for synthesizing a chromium silieide-silicon carbide composite using a chemical processing technique. The precursor used in this synthesis route is a homogeneous aqueous solution of chromium chloride and sodium methylsiliconate. This solution may be either processed in bulk or spray dried, to form an intermediate precursor powder. Subsequent thermochemical treatment was carried out at temperatures of 900, 1100 and 1300 Β°C, in a dynamic argon gas environment. Characterization of the chromium silicide-silicon carbide composite was performed using electron microscopy and X-ray analysis. A submicron spherical composite crystalline material was obtained using spray-dried precursor powders. Irregularly shaped particles were obtained when the precursor powder was made by chemical precipitation of the bulk solution. The relative Cr-to-Si concentration distribution of the composite particles has been studied and homogeneous composite particles were produced using the spray-drying process to produce the precursor powder. Structural analysis of the composite powder indicated the presence of two chromium silicide phases, namely CrSi2 and Cr5 Si3. Glucose had a significant effect in reducing the oxide impurities.


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A novel three-step process is used to fabricate submicron silicon carbide powders in this paper. The commercially available silicon powders and phenolic resin are used as raw materials. In the first step, precursor powders are produced by coating each silicon powder with phenolic resin shell. Then,