Структура и механические свойства композиционной керамики CaO-ZrO-=SUB=-2-=/SUB=--Al-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- при малых концентрациях корунда

Abstract

AbstractWe have studied the effect of the ratio between concentrations of zirconium dioxide (stabilized by CaO) and corundum on phase composition and mechanical properties of nanostructured CaO–ZrO_2–Al_2O_3 ceramic composites. The CaO–ZrO_2–Al_2O_3 composites sintered at temperatures typical of ZrO_2 are found to be characterized by the optimal microhardness/fracture toughness ratio at corundum content $${{C}_{{{\text{A}}{{{\text{l}}}_{2}}{{{\text{O}}}_{3}}}}}$$ = 5%. These composites have a high flexural strength; their porosity, coefficient of friction, and wear are typical of those for CaO–ZrO_2 ceramics.