ULTRA-HIGH-TEMPERATURE CERAMIC MATERIAL AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2016 - IPC C04B35/58 C04B35/645 

FIELD: technological processes.

SUBSTANCE: invention relates to production of ceramic materials, particularly to production of composite materials based on refractory compounds for high-temperature use in aerospace engineering. Ultra-high-temperature ceramic material based on zirconium diboride microparticles ZrB₂ or hafnium diboride HfB₂ additionally comprises at least 2 wt% microparticles of lanthanum oxide La₂O₃. Method of producing ultra-high-temperature ceramic material involves crushing and mixing powders of initial charge, drying charge, spark plasma sintering of charge at increased pressures. Sintering is performed in vacuum at temperature 1,850-2,000 °C with, pressure of at least 40 MPa and holding time at maximum temperature of not less than 3 minutes. Method enables to obtain material with high density of more than 97 % of theoretical value, with low open porosity of not more than 0.3 % and having high thermal resistance at temperature gradient of up to 2,370 K.

EFFECT: obtaining ultra-high-temperature ceramic material with homogeneous microporous structure and high heat resistance at temperature gradient of up to 2,370 K, capable of operating in conditions of high-speed gas-dynamic influence of oxidative stream.

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