The effect of liquid glass adding on pressing and reaction sintering of cermet Al2O3 - Al

The features of the process of pressing and reaction sintering of compacts of cermet Al ₂ O ₃ - Al with the use of an additive of water glass have been studied. Its introduction in an amount from 3 to 28% by weight into the original aluminum powder, consisting of lamellar particles with surface alumina films, provides a granulate with a bulk density of 0.4 - 0.5 g / cm ³ . Features of pressing granular powder were studied by analyzing logarithmic diagrams. It was found that the reaction sintering of samples in air occurs in the filtration combustion mode, and the dry residue of water glass activates sintering, providing the formation of nanodispersed inclusions & # 947; -Al ₂ O ₃ , & # 952; -Al ₂ O ₃ , & # 945; -Na ₂ Si ₂ O < sub> 5 and Si in an aluminum matrix with a layered structure. With a cermet density of 2.40 - 2.45 g / cm ³ , its flexural strength is 300 - 320 MPa. Il. 5, bibliography: 5 titles.