Abstract
SiC-based composite ceramics were investigated by X-ray diffraction, electron microscopy and electron-probe X-ray microanalysis. It is established that, depending on the composition of the initial powder mixtures, at T = 1500-1800?C and P = 4 GPa, different types of composite ceramics formed. Ceramics obtained from mixtures with CSiC ? 50 wt. % contains SiC, Si, and Mo. Ceramics on the base of SiC-MoSi2 was obtained from mixtures with CSiC < 50 wt.%.
Highlights
IntroductionSiC is characterized by a high hardness, a high modulus of elasticity, and a high thermal conductivity, a low thermal expansion coefficient, and the semi-conductor type of conduction, etc
Composites on the base of silicon carbide and molybdenum silicides synthesized in the last decade extended essentially the fields of application of each of these compounds [5,6,7,8]
An insignificant amount of SiC and C is present in it, which is due to features of synthesis of nanosized SiC powders and sintering conditions of the ceramics (Fig. 1a)
Summary
SiC is characterized by a high hardness, a high modulus of elasticity, and a high thermal conductivity, a low thermal expansion coefficient, and the semi-conductor type of conduction, etc. Silicides form a large class of inorganic compound exhibiting different physical, chemical, and electrophysical properties [4]. Molybdenum silicides have found an extensive application, MoSi2 as a heating element. Composites on the base of silicon carbide and molybdenum silicides synthesized in the last decade extended essentially the fields of application of each of these compounds [5,6,7,8]. At present, different compositions and technologies for synthesizing such composites are being continuously developed [1, 2, 9]
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