Nano-SiC Modified Plasma Sprayed Ceramic Coatings Prepared by Laser Sintering
This paper describes an investigation of nano-SiC reinforced ceramic coating, which has included NiCrAl and Al2O3+13wt%TiO2 coatings pre-produced by atmosphere plasma spraying, implemented by laser sintering. Commercial NiCrAl powders were plasma sprayed onto 45 steel substrates to produce a bond coating with thickness of ~100μm. The Al2O3-TiO2 based coating with ~500μm thickness was then plasma sprayed on top of the NiCrAl bond coating. With CO2 laser, nano-SiC powders were laser sintered on Al2O3-TiO2 based coatings. The microstructure and chemical composition of the modified based coatings were analyzed by such detection devices as scanning electronic microscope (SEM) and x-ray diffraction (XRD). The results show that the size of SiC grains has no obvious growth. In addition, due to the nanostructured SiC phase and laser remelting, the modified coatings exhibited better abrasion resistance than those unmodified samples.
Yingxue Yao, Xipeng Xu and Dunwen Zuo
Z. J. Tian, L. D. Shen, Y. H. Huang, G. R. Hua, "Nano-SiC Modified Plasma Sprayed Ceramic Coatings Prepared by Laser Sintering", Key Engineering Materials, Vols. 375-376, pp. 348-352, 2008