Feasibility Analysis of Self-Reactive Spray Forming TiC-TiB_2-Based Composite Ceramic Preforms

摘要

A new near-net-shape technology, namely, self-reactive spray forming, to prepare ceramic preforms with low cost was proposed by combining the self-propagating high-temperature synthesis (SHS) with the metal spray forming. The feasibility of the technology was illustrated. And TiC-TiB_2 -based structural ceramic was prepared by the new technology. The microstructure of the self-reactive spray formed preforms was analyzed. It was shown that the self-reactive spray formed preforms are composed of four kinds of structure, which takes on the characteristics of rapid solidification. They are griseous continuous base phase TiC_(0.3)N_(0.7), black columnar grain TiB_2 with the size of 100nm-1μm, white by-product phase TiO_2 distributing along the boundary of the base phase, and a few of black anomalous pores respectively.