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 effect of the oxygen impurity on the densification behaviour of AlN was investigated. AlN powders containing different amounts of oxygen were synthesized from alumina and hot-pressed. The way in which oxygen accelerates densification is remarkable. Contrary to what is expected from the densification equation, the sintering rate decreases during the holding time at temperatures above 1900° C. This discrepancy is caused by the liberation of oxygen during the hot-pressing. The compression test, conducted on the hot-pressed specimens, shows that oxygen impurity also improves the mechanical strength of sintered AlN. The sintered specimens with more than 2.5 wt % of oxygen have compressive fracture stresses above 150kg mm−2, which are adequate for a refractory material.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00542817
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