A new method to improve the laser-ablation resistance of Si-SiC coating on C/C composites: Laser cladding

Liu Teng, Xiao Hong Shi, Han Hui Wang, Wei Li, Xue Min Yin, He Jun Li

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

New method to prepare Si-SiC coating on C/C composites by laser cladding (LC-Si-SiC) was established to improve the laser ablation resistance of the coating. Results showed that the LC-Si-SiC coating had lower roughness, better mechanical properties and superior laser-ablation resistance compared with the Si-SiC coating fabricated by the traditional coating preparation process: pack cementation (PC-Si-SiC). Due to the shorter heat treatment and less Si infiltration, the flexural strength of the LC-Si-SiC coated sample was 111.32 MPa, which was 144% higher than that of the PC-Si-SiC coated sample. Confirmed by finite element simulation, the LC-Si-SiC coating exhibited better laser-ablation resistance because of the “sweating cooling” mechanism. Under 23.89 MW∙m−2 ablation for 7 s, the surface temperature of the LC-Si-SiC coated sample was 3046 K, which was 157 K lower than that of the PC-Si-SiC, causing the mass loss rate of the LC-Si-SiC coating (0.10%) was only 45.45% of the PC-Si-SiC coating.

Original languageEnglish
Pages (from-to)6425-6434
Number of pages10
JournalJournal of the European Ceramic Society
Volume42
Issue number14
DOIs
StatePublished - Nov 2022

Keywords

  • C/C composites
  • Laser cladding
  • Laser-ablation
  • Mechanical properties
  • Pack cementation

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