ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The normal impurities in hot-pressed Si3N4 fabricated with MgO as an additive include Ca, Fe, WC, and SiO2. Within the bulk material the conditions are highly reducing, so the Fe and W will be in the reduced state. Thus the equilibrium oxide phases can be predicted from the CaO-MgO-SiO2 phase diagram suitably modified by the solubility of the Si3N4 in the liquid phase. The presence of the Fe and W can lead to enhanced liquid formation on the surface, where the oxygen potential is higher. Only the nitrogen is capable of generating high internal pressures.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00569275
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