METHOD OF MAKING CERAMICS BASED ON SILICON NITRIDE - TITANIUM NITRIDE COMPOSITE Russian patent published in 2019 - IPC C04B35/593 C04B35/645 C04B35/65 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to a method of producing a ceramic composite from silicon nitride, hardened with titanium nitride, having a combination of physical and mechanical properties, such as high strength and hardness, low coefficient of thermal expansion, wear resistance and electrical conductivity. This type of ceramics is designed for operation in acidic and aggressive media, in conditions of high temperatures and prolonged mechanical action. Proposed method comprises mixing silicon nitride powder with sintering additive and titanium metal produced by plasma chemical method, grinding in medium of isopropanol in planetary mill, drying, addition of 3 wt% aqueous 10 % solution of polyvinylpyrrolidone, cold uniaxial pressing of blanks. Subsequent sintering and nitriding of workpieces is carried out in one step by hot pressing in graphite mold at 1,650 °C with maximum specific pressure of 30 MPa for 60 minutes in nitrogen atmosphere.

EFFECT: method enables to obtain in one stage dense ceramic materials having strength of up to 565 MPa, density higher than 3_14 g/cm³ and conducting electric current.

1 cl, 1 dwg, 1 tbl, 2 ex