Kinetic study of cobalt silicide infiltration into silicon carbide preforms

Infiltrations of titanium-doped cobalt silicide into silicon carbide prefor ms were performed using an indirect infiltration method. The infiltration w as found to proceed in two stages. In the early stage a melt spread over th e pore surfaces and coated the solid particles, and in the final stage the melt filled the intervals between coated particles. The degree of infiltrat ion is linearly dependent upon infiltration time in the early stage and slo ws down in the final stage. The Washburn equation and Darcy's law do not fi t the infiltration process. A model involving melt spreading and coating du ring infiltration is proposed to explain the linear dependence between the degree of infiltration and the infiltration time.