THE INFLUENCE OF SYNTHESIS TEMPERATURE ON THE PHASE COMPOSITION AND STRUCTURE OF TERNARY COMPOUNDS PRODUCED FROM TiH₂–Si–C POWDER MIXTURES

Abstract

The paper examines the formation of phases and structurization in ternary compounds produced by thermal synthesis from the TiH₂–Si–C powder mixture. The thermal synthesis was carried out in vacuum at 1150, 1300, and 1400 °С. According to X-ray diffraction and structural analysis, titanium carbide is the major phase in the alloy after the synthesis at 1150 °С. There are also a Ti₅Si₃ silicide phase and an insignificant amount of free carbon in the alloy. When synthesis temperature increases to 1300 °С, the titanium carbide content decreases and a Ti₅Si₄ silicide phase and ternary Ti₃SiC₂ compound show up in the alloy. When synthesis temperature increases further to 1400 °С, the alloy mainly consists of laminate-like ternary Ti₃SiC₂ grains and an insignificant amount of titanium carbide and Ti₅Si₄ intermetallide. An increase in the synthesis temperature from 1150 to 1400 °С leads to a significant growth of grains representing the main alloy components.