Comparison of the coatings deposited using Ti and B4C powder by reactive plasma spraying in air and low pressure |
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| Authors: | Zhengping Mao Jing Ma Jun Wang and Baode Sun |
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| Affiliation: | (1) State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai, 200240, People’s Republic of China;(2) State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, People’s Republic of China;(3) Material Institute, Hebei University of Science and Technology, Shijiazhuang, 050054, People’s Republic of China |
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| Abstract: | The coatings were deposited by reactive plasma spraying (RPS) in air and low-pressure plasma spraying (LPPS) based on the
reaction between Ti and B4C powder, respectively. The thermal spray powder of Ti and B4C added with powder Cr (metallic binder) in air is compared with that without powder Cr addition in the low pressure. (Prior
to deposition, the powder was screened and separated for RPS whereas spray drying, sintering and sieving were done for LPPS.)
The phase composition and the microstructure of coatings were studied by X-ray diffractometer (XRD) and scanning electron
microscopy (SEM). The anti-corrosion property of coatings was also investigated. It is found that the coating prepared by
RPS, which is more densification, is composed of TiN, TiB2, and a small phase fraction of titanium oxides. The composition of the coating deposited by reactive LPPS is TiB2, Ti(C, N), Ti4N3−x
and impurity phase of Ti5Si3. There is no appearance of titanium oxides in low pressure. The coatings have the typical lamellar structure and adhere to
the bond coating well. The mean Vickers microhardness value of the coating deposited by RPS is higher than that of the coating
deposited by LPPS. Furthermore, the corrosion resistance of the coating deposited by RPS is superior to that of the coating
prepared by LPPS in near neutral 3.5 wt% NaCl electrolyte. |
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