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Формула изобретени Керамический материал, включающий SiO2, 51зМ4, отличающийс тем, что, с целью иовышени механической прочности, он содержит указанные компоненты в следующих количествах в вес. %:Claims Ceramic material comprising SiO2, 51zM4, characterized in that, in order to improve mechanical strength, it contains these components in the following amounts by weight. %:SiOa98-99,5SiOa98-99,5Si3N40,5-2Si3N40.5-2