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fandewei

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119227086(金币+28, 翻译EPI+1):很感谢! 2010-04-21 17:06
The oxidation mechanism of nano Si3N4 ceramics was discussed by studing oxidation behavior and oxidation kinetics of nano Si3N4 ceramics samples as well as by reoxidation experiment. The results showed that the oxidation weight gains of Si3N4followed parabolic law !ΔW"2=Kpt as the time increased.Oxygen diffusion from outside surface to inside of oxidation layer was a controlled step and the effects of additives and impurities on Si3N4 oxidation speed were produced by changing diffusion speed which came from the change of composition and structure in oxidation layer.
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2楼2010-04-21 16:31:20
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