SUS430合金表面喷涂LSM的浆料分散研究

Dispersion of LSM Slurry for Spray Coating on SUS430 Alloy

以松油醇为溶剂、以三油酸甘油酯为分散剂同时进行超声处理制备了LSM粉体浆料,对SUS430合金表面进行喷涂后在N2气保护气氛下烧成制备了LSM涂层。对涂层断面进行了SEM形貌分析,结果表明,制得的LSM涂层致密且与基体结合良好,涂层平均厚度在15μm左右;对800℃下空气氛围中涂层样品在160h内的氧化增重进行了测试,结果表明,添加三油酸甘油酯和进行超声处理均可以改善LSM浆料的分散性能,但三油酸甘油酯在烧结过程中的挥发也会对LSM涂层的抗氧化性能产生负面影响。

LSM slurry was prepared under ultrasonic irradiation,using terpineol as a solvent and triolein as a dispersant.The LSM coating was obtained by spraying the slurry on SUS430 alloy surface and sintering it in N2 atmosphere.The SEM morphology of the cross section of LSM coating was observed and the results showed that the coating was dense and well bonded with the matrix with the average thickness of about 15μm.The weight gain of the LSM coating after the oxidation at 800℃ in air for 160h was measured.The results showed that both the addition of triolein and the treatment of ultrasonic irradiation improved the dispersion performance of LSM slurry,but the volatilization of triolein in the sintering process negatively affected the oxidation resistance of the LSM coating.