METHOD OF MAKING ARTICLES FROM SILICON NITRIDE Russian patent published in 2015 - IPC C04B35/587 C04B35/626 

FIELD: chemistry.

SUBSTANCE: invention relates to production of heat-resistant articles from ceramic materials which can be used in electrical engineering. A silicon nitride powder composition with metal oxide additives selected from: Al₂O₃, Y₂O₃, MgO, taken in amounts of Al₂O₃ 2-6 wt %, Y₂O₃ not more than 9 wt %, MgO not more than 6 wt % of the weight of the mixture (total amount of additives is not more than 17% of the weight of the mixture) is subjected to mechanical activation in an ethanol medium, dried and subjected to uniaxial cold pressing in a closed press mould at 50-100 MPa. The obtained workpieces are annealed on air in a silicon nitride filling at 600°C and then sintered in a silicon nitride filling.

EFFECT: improved physical and mechanical properties of the articles and making articles with an irregular shape.

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