选用纳米团聚粉末和常规微米商用ZrB2-SiC粉末,利用超音速等离子喷涂在310S耐热不锈钢基体上制备高温抗氧化ZrB2-SiC复合涂层.采用XRD、SEM、EDS分析涂层组织结构;拉伸法测定涂层结合强度;静态高温氧化法表征涂层抗高温氧化性能.优化了喷涂距离,研究纳米和微米ZrB2-SiC粉末对涂层形貌、组织结构及性能的影响.结果表明:纳米团聚粉末(n-ZS)涂层表面孔隙和微裂纹较微米商用粉末(m-ZS)涂层大幅减少,涂层更为致密;n-ZS涂层结合强度达到44.6 MPa,较m-ZS涂层提升了约67％;经过1 100℃、50h的高温氧化试验,n-ZS涂层增重明显低于m-ZS涂层,氧化倾向低,具有更好的高温抗氧化能力.
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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