Hot-Pressing of Si3N4 with Y2O3 and Li2O as Additives |
| |
Authors: | L. J. BOWEN T. G. CARRUTHERS R. J. BROOK |
| |
Affiliation: | Department of Ceramics, University of Leeds, beds LS2 9JT, England |
| |
Abstract: | The rates of densification and phase transformation undergone by α-Si3N4 during hot-pressing in the presence of Y2O3, Y2O3−2SiO2, and Li20−2Si02 as additives were studied. Although these systems behave less simply than MgO-doped Si3N4, the data can be interpreted during the early stages of hot-pressing as resulting from a solution-diffusion-reprecipitation mechanism, where the diffusion step is rate controlling and where the reprecipitation step invariably results in the formation of the β-Si3N4 phase. |
| |
Keywords: | |
|
|