#microcracking structure

High-Temperature Ceramic Material with the Increased Erosive Firmness by Kharitonov DV* in Crimson Publishers: Peer Reviewed Material Science Journals 

Increase in operating temperatures of the gas turbine engine hot path demands application of more high-temperature materials for the GTE metal elements production. In turn, it dictates more strict requirements to the refractory crucibles used in installations of vacuum induction melting of nickel alloys. Nowadays the greatest distribution was gained by the crucibles of mullite-corundum and corundum-zirconiumoxide-silicate structures differing in high thermal stability due to formation of microcracking structure. However, the presence of silicon at the ceramic structure leads to the increased erosion of refractory material and the pollution of metal by silicon. The most inert in relation to fusions of nickel are refractory materials of purely corundum structure with low open porosity. 

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