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Microstructure and Tribological Properties of Plasma Sprayed NiCr/Cr(3)C(2) and NiCr/Cr(3)C(2)-BaF(2)center dot CaF(2) Composite Coatings
Huang, C. B.; Du, L. Z.; Zhang, W. G.
2009
Conference Name5th China International Symposium on Tribology/1st International Tribology Symposium of IFToMM
Source PublicationADVANCED TRIBOLOGY Pages: 669-675
Pages669-675
Conference DateSEP 24-27, 2008
Conference PlaceBeijing, PEOPLES R CHINA
PublisherTsinghua University Press
AbstractNiCr alloy coated BaF(2)center dot CaF(2) eutectic and Cr(3)C(2) powders (NiCr/Cr(3)C(2) and NiCr/BaF(2)center dot CaF(2)) are prepared by pressurized hydrogen reduction and solid state alloying process. NiCr/Cr(3)C(2) and NiCr/Cr(3)C(2)-BaF(2)center dot CaF(2) coatings are fabricated by atmospheric plasma spray technology. Both the coatings exhibit low porosity, high micro-hardness and high cohesive strength. Compared with NiCr/Cr(3)C(2) coating, the NiCr/Cr(3)C(2)-BaF(2)center dot CaF(2) coating shows much more superior wear resistance and noticeably lower friction coefficient under dry sliding wear test conditions at high temperature. The friction coefficient of both two coatings are high (mu=0.7-0.8) at room temperature, and decreases with the increase of load. However, the friction coefficient of NiCr/Cr(3)C(2)-BaF(2)center dot CaF(2) coating reduces to 0.38 +/- 0.03 when temperature is up to 500 degrees C, which is significantly lower than NiCr/Cr(3)C(2) coating (mu=0.62 +/- 0.02). Brittle fracture and delamination are the dominant wear mechanisms of the two coatings at low temperature. BaF(2)center dot CaF(2) eutectic, acting as a solid lubricant above 500 degrees C, obtains a much lower shear strength to effectively reduce friction and wear rate of both coating and coupled Si(3)N(4) balls by forming a lubricating film in the wear track.
KeywordPlasma Spray Self-lubricant Coating Microstructure Tribological Properties High-temperature Cr3c2-nicr Coatings Wear Behavior Improvement Oxidation
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Indexed ByISTP
Language英语
Document Type会议论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/11128
Collection研究所(批量导入)
Recommended Citation
GB/T 7714
Huang, C. B.,Du, L. Z.,Zhang, W. G.. Microstructure and Tribological Properties of Plasma Sprayed NiCr/Cr(3)C(2) and NiCr/Cr(3)C(2)-BaF(2)center dot CaF(2) Composite Coatings[C]:Tsinghua University Press,2009:669-675.
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