J Mater Sci Technol ›› 1992, Vol. 8 ›› Issue (4): 279-283.
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LIU Rixin NING Baolin ** Dept.of Metallurgy,Kunming Institute of Technology,Kunming,650093,China*** Dept.of Thermal Energy,Northeast University of Technology,Shenyang,110006,China+ To whom correspondence should be addressed