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|Title:||The role of nitrogen in the intergranular glass phase of Si3N4 on high temperature aplications and wear|
|Author(s):||Silva, R. F.|
Moreira, A. P.
Gomes, J. R.
Miranda, A. S.
Vieira, J. M.
|Journal:||Materials Science and Engineering: A|
|Citation:||"Materials science & engineering A". ISSN 0921-5093. 168 (1993) 55-59.|
|Abstract(s):||The hot hardness of Si3N4 tool materials of the CeO2 and CeO2-AIN doping systems, oxidation in air from 900 to 1450 °C, and turning of tool steel with ceramic inserts of the same compositions were investigated to determine the effect of the N content of the intergranular phase. Si/N grain boundary diffusion was found to be the main controlling mechanism at high temperature for densification, mechanical behavior and hemical degradation of these materials in air, the passivation oxidation rate of the CeO2-AIN-Si3N4 system being dependent on the atomic fraction of N of the intergranular phase, with lower values for the N-rich compositions.|
|Appears in Collections:||CIICS - Artigos em revistas de circulação internacional com arbitragem científica|
DEM - Artigos em revistas de circulação internacional com arbitragem científica