| ZHAO Zi-peng,SI Hong-li,LI Zhong-sheng,HE Qing-bing,YI Tong-bin,SONG Kai-qiang,CONG Da-long.Microstructrure and Friction and Wear Properties of NiCr-Cr3C2 Coating by APS and HVOF[J],48(8):225-230 |
| Microstructrure and Friction and Wear Properties of NiCr-Cr3C2 Coating by APS and HVOF |
| Received:January 25, 2019 Revised:August 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.08.030 |
| KeyWord:air plasma spraying high velocity oxygen fuel NiCr-Cr3C2 coating mechanical properties friction wear performance |
| Author | Institution |
| ZHAO Zi-peng |
1.Southwest Technology and Engineering Research Institute, Chongqing , China |
| SI Hong-li |
2.Chongqing Military Missile Equipment Representative Office of Navy, Chongqing , China |
| LI Zhong-sheng |
1.Southwest Technology and Engineering Research Institute, Chongqing , China |
| HE Qing-bing |
1.Southwest Technology and Engineering Research Institute, Chongqing , China |
| YI Tong-bin |
1.Southwest Technology and Engineering Research Institute, Chongqing , China |
| SONG Kai-qiang |
1.Southwest Technology and Engineering Research Institute, Chongqing , China |
| CONG Da-long |
1.Southwest Technology and Engineering Research Institute, Chongqing , China |
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| Abstract: |
| The work aims to investigate microstructrure, mechanical behavior and friction and wear properties of NiCr-Cr3C2 coating prepared by APS and HVOF. NiCr-Cr3C2 coatings were fabricated by APS and HVOF, respectively. Phase compostion, microstructure, bonding strength, hardness and friction wear performance of the coatings prepared by two different processes were investigated systematically with X-ray diffractometer (XRD), scanning electron microscope (SEM), universal test machine, microhardness tester and high speed reciprocating friction testing machine. The prepared coatings had good bonding effects with substrate interface. The coating prepared by APS had a lamellar microstructure with some microcracks between the lamellars and higher porosity. However, the coating prepared by HVOF had a uniformal microstructure with no apparent microcrack and lower porosity. The XRD results showed that the phases of coating prepared by APS were NiCr, Cr3C2 and Cr7C3, while the phases of coating prepared by HVOF were NiCr and Cr3C2. The coating prepared by HVOF presented a better wear resistance than that prepared by APS. The steady friction coefficients of coating fabricated by APS and HVOF were 0.4 and 0.6, respectively. The friction coefficients of coating prepared by the two processes decreased significantly with the increase of load. The worn surface of NiCr-Cr3C2 coating prepared by APS showed apparent indentation and spalling, while that of NiCr-Cr3C2 coating prepared by HVOF showed a smooth grinding crack with no apparent spalling. Main wear mechanisms of the coatings prepared by the two processes were abrasive wear and fatigue wear. The NiCr-Cr3C2 coating prepared by HVOF has more compact structure and better comprehensive mechanical properties and wear resistan than that by APS. |
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