粘接相对YSZ基高温封严涂层沉积效率的影响

Effect of Bonding Phases on Deposition Efficiency of YSZ-based Sealing Coating

通过喷雾造粒法制备出含不同粘接相的B0(不含粘接相)、B1(氧化铝)、B2(钇铝石榴石)和B3(镁铝尖晶石)4种YSZ(YOpartially stabilized Zr O)基团聚颗粒,对4种团聚颗粒的流动性、松装密度及粒径分布进行了研究。利用等离子喷涂技术制备了上述4组高温封严涂层,测量了各组粉末的沉积效率,分析了不同粘接相的粘接机理。结果表明,与B0型团聚粉末相比,B1、B2和B3型团聚粉末的流动性分别降低了6.94%、5.15%和25.2%,松装密度分别减少了2.85%、2.19%和7.67%,大粒度的团聚粉末所占比例分别提高了15.82%、6.65%和29.75%;B1、B2和B3型团聚粉末的沉积效率分别提高了75.80%,181.49%和59.21%。粘接相熔融后对未熔融YSZ粒子和未烧损聚苯酯粒子的黏附和包裹作用是提高涂层沉积效率的主要原因。由于钇铝石榴石粘接相熔点最低、粒度适中,得到的B2型团聚颗粒流动性最好,松装密度最大,大颗粒所占比例最小,因此B2型涂层具有最高的沉积效率。

Four types of YOpartially stabilized ZrO(YSZ)-based agglomerated powder containing no bonding phase,AlO,yttrium aluminum garnet(YAG),and Mg AlO,labeled as B0,B1,B2,and B3,respectively,were prepared by spray granulation.And,the flow ability,apparent density and particle size distribution of those powders were investigated.Besides,the deposition efficiency(DE)and bonding mechanism of the four types of agglomerated powder prepared by atmospheric plasma spraying(APS)were analyzed.The results show that,compared with B0 powder,the flowability of B1,B2 and B3 powder is reduced by 6.94%,5.15% and 25.2%,respectively,the apparent density is reduced by 2.85%,2.19% and 7.67%,respectively,and the proportion of large-size agglomerated powder is increased by 15.82%,6.65% and 29.75%,respectively.The DE of B1,B2 and B3 powder is increased by 75.80%,181.49% and 59.21%,respectively,and the main reason for the improvement of DE is the adhesion and wrapping effect of the bonding phase.Because YAG has the lowest melting point and moderate particle size,B2 powder has the best flowability,the maximum apparent density,and the smallest proportion of large particles,which accordingly results in the strongest adhesion and wrapping effect and eventually leads to the highest DE.