A NiCr--Based High Temperature Self Lubricating Coating PM304 Prepared by Powder Metallurgy

Acta Metall Sin

2006, Vol. 42

Issue (11): 1212-1216 DOI:

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A NiCr--Based High Temperature Self Lubricating Coating PM304 Prepared by Powder Metallurgy

DING Chunhua1); WANG Yaping2);ZHOU Jing'en1)

1) State Key Laboratory for Mechanical Behavior of Materials; Xi'an Jiaotong University; Xi'an 710049

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DING Chunhua; WANG Yaping; ZHOU Jing'en. A NiCr--Based High Temperature Self Lubricating Coating PM304 Prepared by Powder Metallurgy. Acta Metall Sin, 2006, 42(11): 1212-1216 .

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Abstract PM304 composite comprised of NiCr (80/20) matrix (60 wt%) combined with Cr2O3 (20 wt%), Ag (10 wt%) and eutectic BaF2/CaF2 (10 wt%) as solid self-lubricants additives has been prepared by high-energy ball milling and powder metallurgy. Experimental results showed that the sintering temperature had great influence on relative density and tensile strength of the PM304 composite. The relative density and tensile strength of PM304 increased rapidly with the increase of sintering temperature from 800°C to 1100°C. The size of Cr2O3 and BaF2/CaF2 of PM304 composite sintered at 1100°C was less than 1 μm, and that of Ag particles was below 5 μm, the relative density was 94%, and the mean tensile strength 47 MPa, 33% greater than that of PS304.

Key words: PM304 self lubricating NiCr alloy

Received: 17 April 2006

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