Reactive Infiltration of Si‐Mo Alloyed Melt into Carbonaceous Preforms of Silicon Carbide
2000; Wiley; Volume: 83; Issue: 6 Linguagem: Inglês
10.1111/j.1151-2916.2000.tb01430.x
ISSN1551-2916
AutoresOmprakash Chakrabarti, Probal Kumar Das,
Tópico(s)Advanced materials and composites
ResumoA MoSi 2 /reaction‐bonded SiC composite was prepared from a preform of petroleum coke and commercial SiC powders (in weight ratios of 0.5 and 0.6), following reactive infiltration of a Si‐Mo melt (molybdenum concentration of 7–29 wt%) made from elemental powder. The resulting material had a relative density of >90% of the theoretical density and, on a microstructural scale, contained SiC and MoSi 2 , in addition to unreacted carbon and silicon. The SiC and MoSi 2 boundary was smooth and sharp, with no sign of any reaction. The occasional presence of an intermediate zone between SiC and MoSi 2 was detected; this zone contained silicon, iron, and aluminum, the formation of which may be related to the presence of impurities in the silicon and SiC.
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