等离子喷涂纳米结构与传统结构热障涂层的残余应力对比研究

被引:11
作者
王亮
王铀
田伟
杨勇
周红霞
机构
[1] 哈尔滨工业大学材料科学与工程学院
关键词
等离子喷涂; 热障涂层; 残余应力; 纳米结构;
D O I
10.16577/j.cnki.42-1215/tb.2009.03.016
中图分类号
TG174.442 [喷镀法];
学科分类号
摘要
热障涂层的残余应力是影响其服役寿命的关键因素,过去,对纳米结构热障涂层的残余应力研究不多。在45钢基体上,用超音速火焰喷涂NiCoCrAlY打底层,再用大气等离子喷涂ZrO2-8%(质量分数)Y2O3(8YSZ)工作层,制备了纳米结构与传统结构2种类型的热障涂层(TBC)。采用SEM、XRD对这2种涂层的粉末及涂层进行了组织结构分析,用纳米压痕仪测得了2种涂层的弹性模量。用X射线衍射应力测试仪测得了2种涂层的表层残余应力。结果表明:喷涂工艺参数相同条件下,对于打底层及工作层的厚度均相同的2种涂层,纳米结构热障涂层的表层残余应力比传统结构热障涂层约低24.7%;相同打底层的纳米结构热障涂层表层残余应力随着陶瓷层厚度增加而增加,陶瓷层厚度在240μm以下时,表层为残余压应力;厚度超过300μm时,表层为残余拉应力。最后提出了相应的物理力学模型。
引用
收藏
页码:58 / 62+94 +94
页数:6
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