Tribological Properties of Ni-Cr-W Matrix High Temperature Self-Lubrication Composites Sintered by Hot Isostatic Pressing

Abstract:

The high temperature self-lubrication Ni-Cr-W matrix composites were prepared by powder metallurgy and sintered by hot isostatic pressing (HIP). Atomized Ni-Cr-W powder was mixed with friction components of MoS₂ and Graphite. The mixed powders were cold pressed 450MPa and sintered at 1100°C~1200°C in the presence of argon atmosphere for 1 hour under 180MPa hot isostatic pressing with respect to their application in slide bearing bushing. The tribological properties are investigated on UMT-2 tester in ball-on-disc against alloy steel ball. The results showed that the appropriate addition of MoS₂ show excellent antifriction and wear resistance. And the friction coefficients and wear rates decrease over the wide temperature range of 25°C~600°C compared that of the composites by pressureless sintered method. The results indicated that HIP technology had an obviously strengthening effect on the density, and anti-press strength.

• Periodical: Advanced Materials Research (Volume 619)
• Pages: 531-535
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.619.531
• Online since: December 2012
• Authors: Jian Rong Sun, Chang Sheng Li, Hua Tang, Jin Yinzi Liu, Zhi Cheng Guo
• Keywords: High-Temperature, HIP, Ni-W-Cr, Powder metallurgy, Self-Lubrication

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