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| Micro-structure and Properties of Al2O3/Ni-P-SiC Composite Coatings |
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| DOI：10.7643/issn.1672-9242.2023.01.016 |
| KeyWord:aluminum alloy micro-arc oxidation composite electroless plating ablation |
| Author | Institution |
| LI Li |
Southwest Institute of Technology and Engineering, Chongqing , China |
| LI Zhong-sheng |
Southwest Institute of Technology and Engineering, Chongqing , China |
| CONG Da-long |
Southwest Institute of Technology and Engineering, Chongqing , China |
| ZHANG Min |
Southwest Institute of Technology and Engineering, Chongqing , China |
| YANG Jiu-zhou |
Southwest Institute of Technology and Engineering, Chongqing , China |
| CHEN Han-bin |
Southwest Institute of Technology and Engineering, Chongqing , China |
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| Abstract: |
| The work aims to seal the holes of micro-arc oxidation (MAO) through the chemical composite plating technique to obtain Al2O3/Ni-P-SiC composite coatings with excellent anti-ablation performance. Scanning electron microscope (SEM), optical metallographic microscope (OM), microhardness tester, X-ray diffraction (XRD), microhardness tester and Oxy-acetylene ablation test were adopted to analyze the surface morphology, section morphlogy, thickness, microhardness, phase and anti-ablative performance. The results of this thesis showed that the original surface of the ceramic layer was completely covered by chemical plating. The prepared composite coating was uniform in thickness. The chemical plating was closely embedded with the ceramic layer. The concentration of SiC in the plating bath had a great influence on the plating speed and the co-deposition rate of SiC particles in the plating. When the mass concentration of particles was 16-20 g/L, the co-deposition rate of particles was large. Ni-P-SiC coating with a thickness of about 20 μm could be obtained by composite electroless plating for 60 min, and the SiC particles were evenly distributed. The plating had the maximum harness when the mass concentration of SiC in the plating bath was 16 g/L. Compared with the untreated, micro-arc oxidation and Al2O3/Ni-P-SiC composite coating samples, Al2O3/Ni-P-SiC composite coating had the best ablative resistance. The Al2O3/Ni-P-SiC composite coating is uniform and dense, and has excellent anti-ablation performance. |
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