| CHENG Zheng-ming,LIU Min,DENG Chun-ming,ZHANG Ji-fu,LIN Qiu-sheng,DENG Chang-guang.Effects of Spray Distance on the Microstructure and Property of LT-HVOF Ti Coating[J],43(2):13-17 |
| Effects of Spray Distance on the Microstructure and Property of LT-HVOF Ti Coating |
| Received:October 15, 2013 Revised:April 10, 2014 |
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| DOI： |
| KeyWord:low temperature HVOF (LT-HVOF) spray distance Ti coating flattening |
| Author | Institution |
| CHENG Zheng-ming |
1. South China University of Technology, Guangzhou , China;2. Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou , China |
| LIU Min |
Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou , China |
| DENG Chun-ming |
Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou , China |
| ZHANG Ji-fu |
Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou , China |
| LIN Qiu-sheng |
Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou , China |
| DENG Chang-guang |
Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou , China |
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| Abstract: |
| Objective To study the effects of spray distance on the microstructure and property of Ti coatings. Methods Ti coatings were prepared at different spray distances by Low Temperature HVOF process. The microstructure, phase structure and microhardness of the coatings were analyzed. Besides, the influence mechanism of spray distance on Ti coatings was discussed. Results The results showed that LT-HVOF Ti coatings had relatively high surface roughness, and the porosity of the coatings first decreased and then increased with the increase of spray distances, and the minimum porosity of the coating was 0. 70% at the spray distance of 150 mm; no obvious oxidation was observed in Ti coatings; the splats deposited on the substrate were mainly in its solid state. Conclusion When the spray distance was 150 mm, Ti particles were sufficiently heated in plume and had a high in-flight velocity, so Ti splats were well flattened to form dense Ti coating. |
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