Open AccessFeatures of the synthesis and consolidation of MeIVB2– (MeIV, Mo)Si2 ceramic powder for high-temperature applications
Author(s) -
Yu. S. Pogozhev,
М. В. Лемешева,
A. Yu. Potanin,
В. И. Вершинников,
Е. А. Левашов
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/558/1/012033
Subject(s) - materials science , ceramic , hot pressing , porosity , scanning electron microscope , metallurgy , composite material
ZrB 2 –ZrSi 2 –MoSi 2 and HfB 2 –HfSi 2 –MoSi 2 composite ceramic powders were obtained by magnesiothermic SHS. The synthesized powders were consolidated by hot pressing in the temperature range of 1200-1250°C at 30 MPa. The structure and phase composition of the powders and compact ceramics were studied by X-ray powder diffraction analysis and scanning electron microscopy. ZrB 2 /HfB 2 , ZrSi 2 /HfSi 2 , ZrSi, and MoSi 2 were the key phases of the ceramic powders and sintered ceramics. The average grain size of the powders after grinding was 6–8 μm. Saturation of the ZrSi phase with silicon and increased ZrSi 2 content were observed during hot pressing. The dense ceramics had a residual porosity of 1.1–7.4%, which was largely dependent on the contents of silicides in SHS powders.