Acta Metallurgica Sinica (English Letters) ›› 1999, Vol. 12 ›› Issue (4): 633-636.
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F. Y. Chen1)and E. D. Delber2) 1) State Key Laboratory of Solidification Process,Northwestern Polytechnic University ,Xi’an 710072 ,China 2) Department of Ceramics Engineering , University of Missouri Rolla, Rolla, Mo 654301 , USA