| ZHAO Lei,HOU Jin-bao,MENG Jun-hu,HAN Jie-sheng.Microstructure and Tribological Properties of NiCr-Cr3C2 Coating Deposited by Electro-contact Sintering[J],48(4):116-121 |
| Microstructure and Tribological Properties of NiCr-Cr3C2 Coating Deposited by Electro-contact Sintering |
| Received:December 14, 2018 Revised:April 20, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.04.017 |
| KeyWord:electro-contact sintering NiCr-Cr3C2 wear-resistant layer adhesion strength wear resistance microstructure |
| Author | Institution |
| ZHAO Lei |
1.Key Laboratory of Aeronautical Welding and Connection Technology, AVIC Manufacturing Technology Institute, Beijing , China |
| HOU Jin-bao |
1.Key Laboratory of Aeronautical Welding and Connection Technology, AVIC Manufacturing Technology Institute, Beijing , China |
| MENG Jun-hu |
2.Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| HAN Jie-sheng |
2.Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to prepare NiCr-Cr3C2 coating with good tribological properties by electro-contact sintering on the basis of plasma spraying. The reinforced NiCr-Cr3C2 coating was deposited by electro-contact sintering after prefabricated on GH4169 alloy by plasma spraying. The phases, structure and interface of NiCr-Cr3C2 coating were analyzed by OM, SEM, XRD and EDS. Tribological properties of the coating were evaluated by ball-disk rotating friction and wear tester. The instantaneous heating of electro-contact sintering promoted the plastic deformation and heat diffusion of NiCr-Cr3C2 coating deposited and decreased the porosity from 5% to 2% and increased the adhesion strength from 46 MPa to 210 MPa. A complete friction layer was formed on the friction surface of coating at 400 ℃ and 600 ℃. The coefficient of friction decreased from 0.8 at 400 ℃ to 0.45 at 600 ℃ due to the components of eutectic fluoride. The coating appeared oxidative wear at 600 ℃. Electro-contact sintering can enhance the properties of NiCr-Cr3C2 coating such as higher bonding strength, lower porosity and friction coefficient. The coating exhibits better friction and wear behaviors at 600 ℃. |
| Close |
|
|
|