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《Acta Metallurgica Sinica》 2006-11
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A NiCr-BASED HIGH TEMPERATURE SELF LUBRICATING COATING PM304 PREPARED BY POWDER METALLURGY

DING Chunhua, WANG Yaping, ZHOU Jing'en State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049 School of Science, Xi'an Jiaotong University, Xi'an 710049  
PM304 coating comprised of 60% Ni80Cr20 and self-lubricating additives of 20% Cr2O3, 10% Ag and 10% BaF2/CaF2 eutectic has been prepared by high-energy ball milling and powder metallurgy. Experimental results showed that the sizes of Cr2O3 and BaF2/CaF2 in PM304 coating sintered at 1100℃for 2 h are about 100 nm and 1μm, respectively, and that of Ag particles is below 5μm, the relative density of the coating is 94%, and the mean tensile strength is 47 MPa, 33% greater than that of PS304 coating prepared by plasma spraying. The mean thermal expansion coefficient of PM304 is about 12.6×10-6℃in the temperature range of 200-800℃. The friction coefficient of PM304 coating is lower than that of PS304 coating at temperatures from 20 to 650℃.
【Fund】: 陕西省自然科学基金资助项目2005E14~~
【CateGory Index】: TF123
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