J Mater Sci Technol ›› 1998, Vol. 14 ›› Issue (2): 147-150.
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Deyuan LI; Zhenfeng ZHOU and Daqian SUN (Jilin University of Technology, Changchun 130025, China)Chengji SHAO(Shenyang Polytechnical University, Shenyang 110023, China)