| YUN Guang-tao,LI Qi-lian,CHENG Xu-dong.Friction and Wear Properties of NiCrAlYSi / h-BN High-temperature Abradable Seal Coatings[J],45(2):103-108,174 |
| Friction and Wear Properties of NiCrAlYSi / h-BN High-temperature Abradable Seal Coatings |
| Received:November 18, 2015 Revised:February 20, 2016 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.02.016 |
| KeyWord:plasma spray NiCrAlYSi / h-BN seal coatings microstructure abradability wear mechanisms |
| Author | Institution |
| YUN Guang-tao |
1. State Key Laboratory of Advanced Technology for Materials Synthesis and Progressing, Wuhan University of Technology, Wuhan , China; 2. Laboratory of Science and Technology on Power Beam Processes, Beijing Aeronautical Manufacturing Technology Research Institute, Beijing , China |
| LI Qi-lian |
Laboratory of Science and Technology on Power Beam Processes, Beijing Aeronautical Manufacturing Technology Research Institute, Beijing , China |
| CHENG Xu-dong |
State Key Laboratory of Advanced Technology for Materials Synthesis and Progressing, Wuhan University of Technology, Wuhan , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Objective To improve the tribological properties of the NiCrAlYSi based seal coatings by adding h-BN and polyester into the coatings as lubrication and pore forming material, respectively. Methods The NiCrAlYSi / h-BN / polyester composite powder was prepared by the technology of vacuum melting atomization and spray granulation. The NiCrAlYSi / h-BN high-temperature abradable seal coatings were prepared by atmospheric plasma-spray technology. The microstructure, elements and tribological properties at room temperature and 800 ℃ of coatings were studied by SEM,EDS,CSM tribometer and three-dimensional contour instrument. The tribological mechanisms of the coatings were investigated at room temperature and 800 ℃ . Results The NiCrAlYSi / h-BN abradable seal coatings had uniform microstructure and the tensile strength of the coatings was about 15 MPa. The porosity of the coating was about 32% . The room-temperature average friction coefficient between NiCrAlYSi / h-BN and DD6 alloy ball was 0. 897, and the average friction coefficient at 800 ℃ was 0. 425. The wear volume of the coatings at room-temperature and 800 ℃ was 2. 09×108 μm3 and 3. 22×108 μm3 , respectively. The wear performance of the coating at 800 ℃ was good and the abrasion of DD6 alloy ball was slight, which was due to the softened metal matrix phase, the lubrication of h-BN lubricant material and the formation of metallic self-lubricant oxide at high temperature. The main room-temperature wear mechanisms of NiCrAlYSi / h-BN coating were smearing, particle wear and slight tribo-oxidation; while the main wear mechanisms at high temperature were cutting, plastic deformation, tribo-oxidation and adherence wear. Conclusion The NiCrAlYSi / h-BN high temperature abradable seal coatings exhibited excellent wear performance at high temperature. |
| Close |
|
|
|