Effects of Nano and Micro Powder on High-temperature Oxidation Resistance of ZrB<sub>2</sub>-SiC Coatings

doi:10.11933/j.issn.1007-9289.20161130001

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China Surface Engineering ›› 2017, Vol. 30 ›› Issue (2) : 119-127. DOI: 10.11933/j.issn.1007-9289.20161130001

Effects of Nano and Micro Powder on High-temperature Oxidation Resistance of ZrB₂-SiC Coatings

LI Wen-sheng, ZHANG Yi, FENG Li, AN Guo-sheng, WANG Lei and WANG Yu-xi

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High temperature oxidation-resistant ZrB₂-SiC coating was prepared on the 310S heat-resistant stainless steel substrate by supersonic plasma spraying using nano-agglomerated powder and conventional micronized commercial ZrB₂-SiC powder. XRD, SEM and EDS were used to analyze the structure of the coating. The bonding strength of coatings were determinated by tensile method. High temperature oxidation resistance of coatings were tested by static high temperature oxidation test. The spraying distance was optimized and the effect of nano and micro ZrB₂-SiC powder on the coating structure, morphology, mechanical and physical properties were investigated. The results show that surface pores and microcracks of the coating prepared by the nano-agglomerated powder(n-ZS) are much less than that of the micronized commercial powder(m-ZS), and the n-ZS coating is denser. The bonding strength of the n-ZS coating is about 44.6 MPa, which increases by about 67% compared with the m-ZS coating. After high-temperature oxidation test at 1 100℃ for 50 hours, the mass gain of n-ZS coating is much lower than that of the m-ZS coating, which has low oxidation tendency and better oxidation resistance at high temperatures.

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supersonic plasma spraying;powder particle size;spraying distance;bonding strength;oxidation resistance at high temperature

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LI Wen-sheng, ZHANG Yi, FENG Li, AN Guo-sheng, WANG Lei and WANG Yu-xi. Effects of Nano and Micro Powder on High-temperature Oxidation Resistance of ZrB₂-SiC Coatings[J]. China Surface Engineering, 2017, 30(2): 119-127 https://doi.org/10.11933/j.issn.1007-9289.20161130001

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2023-12-19

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