Process for producing densely sintered ceramic components...

C - Chemistry – Metallurgy – 04 – B

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C04B 35/56 (2006.01) C04B 35/593 (2006.01) C04B 35/64 (2006.01)

Patent

CA 2115408

ABSTRACT: Process for producing densely sintered ceramic components made of silicon nitride and having high mechanical strength In the process for producing a homogeneous and finely crystalline silicon nitride ceramic, ceramic powder is milled, mixed with shaping aids, the mixture is shaped into parts and the shaped parts are subsequently sintered in a nitrogen atmosphere. According to the invention, sintering is carried out in a multistage process at temperatures Tmax in the range from 1700 to 1900°C using gas pressures in the range from 0.3 to 50 MPa. In a first temperature stage, a temperature from 0.9 to 0.96 Tmax is maintained over a time period from 10 to 50 minutes at an N2 pressure from 0.2 to 1.2 MPa, while in a second temperature stage a temperature from 0.97 to 0.985 Tmax is maintained over a time period from 20 to 80 minutes at an N2 pressure from 3 to 6 MPa. Then the temperature is increased to Tmax and the pressure is increased to from 7 to 50 MPa.

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