| LI Yu-tao,LI Hui.Plasma-sprayed Metallic Transition Coating on Cf/SiC Surface and Interface Bonding Characteristics[J],48(4):97-103 |
| Plasma-sprayed Metallic Transition Coating on Cf/SiC Surface and Interface Bonding Characteristics |
| Received:October 14, 2018 Revised:April 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.04.014 |
| KeyWord:plasma spraying Cf/SiC composite Mo-10wt.%Ti composite coating bonding strength thermal expansion coefficient wettability |
| Author | Institution |
| LI Yu-tao |
School of Materials Science and Engineering, Beijing University of Technology, Beijing , China |
| LI Hui |
School of Materials Science and Engineering, Beijing University of Technology, Beijing , China |
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| Abstract: |
| The work aims to prepare metallic coatings on Cf/SiC composite substrate by plasma spraying (APS). Based on the analysis of coating characteristics and interfacial bonding of the plasma sprayed Mo, NiCrBSi and in-house Ti70Ni20Cu10 composite powder, a Mo-10wt.%Ti composite coating was prepared. The composite powder subject to spraying was made by cladding large particle Mo powder with small TiH2 powder with a low-energy ball milling method. The substrate temperature was preheated to 700 ℃ during spraying, and the spraying was conducted under an argon atmosphere. The sprayed Mo-10Ti coating presented a dense and uniform microstructure, with low porosity and without obvious cracks. The coating was well bonded to the substrate without any peeling. The bonding strength of the coating exceeded 6.3 MPa, and fracture occurred at substrate. The thermal expansion coefficient and the wettability of the material are the key factors affecting the adhesion of plasma sprayed metallic coating on the Cf/SiC composite substrate. The designed Mo-Ti composite coating takes both two issues into account. |
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