Determination of phase composition and mechanical properties of surface of the material obtained on the basis of silicon and carbon by spark-plasma sintering method

Abstract

Friction coefficients and wear resistance are determined, and the x-ray phase composition of experimental samples of obtained material on the basis of silicon and carbon is studied in this paper. Secondary products of the industry were used as initial powder to conduct spark plasma sintering. The composition of burden used for sintering, which was 75% of the mass of silicon and 25% of the mass of graphite (carbon basis), was determined by calculation. Studied samples were obtained by spark plasma sintering method.<br />Based on the analysis of results of the phase composition of the samples obtained by spark plasma sintering method using secondary products of the industry as the initial components, the following conclusions can be made:<br />- It was found that all samples obtained by the method of spark plasma sintering consist of the following phases: The phase of metallic silicon (cubic crystal lattice), the phase of graphite (hexagonal crystal lattice), the phase of silicon carbide with cubic and hexagonal lattice and have a low coefficient of friction;<br />- It was determined that the mass fraction of the silicon carbide phase content is from 20 to 30% depending on the heating temperature;<br />- It was found that the increase in the sintering temperature of the samples have a beneficial effect on the wear intensity of obtained ceramic material;<br />- It was found that from the obtained samples of carbide silicon ceramics the wear resistance of the material increases and the friction coefficient and wear decrease due to an increase in the mass fraction of the carbide phase, that is, a more dense frame is formed.<br />Based on the above, we can say that with an increase in the sintering temperature, the interaction of powder components forms a more stable frame of silicon carbide, which is proved by conducted phase analysis.