No abstract

The formation, densification behaviour and mechanical properties of 21R polytype were studied. Self-propagating high-temperature synthesis obtained the starting powder of 21R-sialon. Sealing was carried out by hot pressing in the temperature range 1650-1800°C. With increasing temperature, there is an increase in density and mechanical properties.

In this study, the effect of NbSi2 in the range from 10 to 90 wt% was investigated. on the properties of composites (Mo1-xNbx)Si2 obtained by hot pressing a solid-phase mixture of molybdenum and niobium disilicides at a temperature of 1700°C. Graphs of the dependence of density, bending strength, electrical resistivity, CLTE and microhardness of the content of NbSi2 were obtained. It was found, that with an increasing level of NbSi2 in the content, the flexural strength drops to 130 MPa. The electrical resistivity depending on the content of niobium silicide is extreme with a maximum for the composition (Mo0,5Nb0,5)Si2. In the concentration range of NbSi2 20-100 wt.% CLTE and microhardness of the composite within the error does not change.