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- Title
Preparation and properties of Si-SiC-TaB<sub>2</sub> anti-ablation composite coatings on graphite surface.
- Authors
Tian Yuan; Jiang Yan; Fu Wanlu; Naihuo Cailiao
- Abstract
In order to improve the ablation resistance of carbon materials, Si-SiC and Si-SiC-TaB2 coatings were prepared on the surface of graphite materials using graphite block as the matrix, SiC (d50 =10 µm), B4C (d50 =50 µm) and TaC (d50=3 µm) as main raw materials, by the slurry method combined with reactive melt infiltration of Si. The phase composition, the microstructure, and the element distribution of the coatings were studied, the thermal shock resistance of the Si-SiC-TaB2 composite coating from room temperature to 1 600 °C was investigated, and the ablation resistance of the coating on graphite at high temperatures was tested by the plasma flame ablation test (120 and 1 980 s at 2 350 °C, respectively). The results show that: the structure of Si-SiC-TaB2 composite coating is dense, and there is no obvious interface among SiC, TaB2 ceramic particles and Si in the coating. After 20 cycles of thermal shock from 1 600 °C to room temperature, the mass of the coating sample basically increases gradually, and the sample performs good thermal shock resistance. The mass of the Si-SiC-TaB2 composite coated sample increases after 1 980 s of ablation, and the surface is covered with a Ta-Si-O oxidation protective layer containing Ta2O5 and SiO2, which effectively prevents the corrosion of high temperature flame to the interior of the graphite. The mass of the Si-SiC coated sample decreases after ablation, and a damaged SiO2 oxide layer is formed on the surface, and there are clearly visible ablation pits.
- Subjects
COMPOSITE coating; THERMAL shock; GRAPHITE composites; SURFACE coatings; MELT infiltration; GRAPHITE
- Publication
Refractories / Naihuo Cailiao, 2023, Vol 57, Issue 1, p35
- ISSN
1001-1935
- Publication type
Article
- DOI
10.3969/j.issn.1001-2023.01.008