本文研究SiO_2添加剂对ZrO_2涂层结构和性能的影响。结果表明,在增加过渡层的同时,添加3wt-%左右的SiO_2,可使涂层的粘结强度和熱冲击寿命提高4—5倍。添加剂改善涂层寿命的原因是等离子喷涂时,SiO_2熔化渗入ZrO_2颗粒之间和孔隙中,首先起到液相烧结作用;随后在涂层内汽化(蒸发)增加其孔隙率,使涂层的应力易于松弛,而且,SiO_2以石英相形态沿平行于表面方向塞积在涂层孔隙处,隔绝氧化气氛的进入,起到“自封孔”的作用。在粘结层和ZrO_2层之间增加过渡层,有利于涂层应力的延缓过渡。
Adding about 3wt-% SiO_2 and inserting graded coating increased adhesivestrength and thermal shock lifetime of plasma sprayed ZrO_2 ceramic coating by four to fivetimes.The improvement of addition on coating and lifetime was attributed to the changes ofco
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