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| Anti-ablative Properties of ZrB2-TiC Composite Coatings Deposited by Low Pressure Plasma Spraying (LPPS) |
| Received:May 30, 2019 Revised:June 20, 2019 |
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| DOI：10.7643/issn.1672-9242.2019.10.003 |
| KeyWord:low pressure plasma spraying ZrB2-TiC composite coating oxygen- acetylene torch ablation performance |
| Author | Institution |
| WEN Bo |
Aerospace Research Institute of Materials & Processing Technology, Beijing , China |
| NI Li-yong |
Aerospace Research Institute of Materials & Processing Technology, Beijing , China |
| MA Kang-zhi |
Aerospace Research Institute of Materials & Processing Technology, Beijing , China |
| YANG Zhen-xiao |
Aerospace Research Institute of Materials & Processing Technology, Beijing , China |
| QU Dong |
Aerospace Research Institute of Materials & Processing Technology, Beijing , China |
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| Abstract: |
| Objective To explore anti-ablative properties of ZrB2-TiC composite coatings prepared by LPPS. Methods ZrB2-TiC spherical powder available for LPPS was prepared by spray granulation. ZrB2-TiC composite coatings were prepared on high strength graphite by LPPS. The ablation resistance of the coating was tested by oxygen acetylene torch. The surface temperature of the coating was measured with an infrared thermometer. The surface and section morphologies, elements and phases of coatings were analyzed with SEM, EDS and XRD, respectively. Results ZrB2-TiC composite coating showed the plasma spraying in a lamellar structure. The porosity of coating was about 10.8% and the bonding strength between the coating and high strength graphite reached 5.4MPa, approximately. There were ZrTiB4 and ZrTiC2 new phases in the coating after spraying. After being ablated by oxygen-acetylene torch for 5 min at 2000 ℃, the coating was in good condition, without any crack and peeling; and the ablation depth reached only 2-5 μm. Conclusion High performance ZrB2-TiC composite coating could be prepared on graphite by LPPS, and the coating could effectively prevent ablation from the oxyacetylene flame. |
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