PHASE SEPARATION IN MULTIPHASE CERMET MELT AT HIGH TEMPERATURE IN CENTRIFUGAL MACHINES

摘要

A modification of Self-propagating High-temperature Synthesis using green mixtures of thermite type with high combustion temperature allows to obtain various cast refractory ceramics , layered and functionally graded materials, component parts and protective coatings on them. It is possible to select three main stages in the process: 1-combustion of thermite mixture and formation of chemical composition in multiphase me 2- phase separation in a high-temperature multiphase me 3- cooling and formation of cast products. Results of experimental and theoretical studies of phase separation in a high temperature multiphase melt under artificial high gravity condition (in centrifuge, a = 1-1000g, g is the gravity acceleration) are considered in the paper. Significant attention is paid to controling of completeness of separation of oxide and metallic phases at fast cooling of combustion product melt, dynamics of interaction between hot melt and cold metal base, spreading metallic melt and formation of protective coating on the surface of base.