两种稀土掺杂改性热障涂层陶瓷靶材制备及其性能比较分析研究  

Preparation and Properties Comparison of Two Novel Rare Earth Modified Ceramic Ingots Used for Thermal Barrier Coatings

作　　者：高栋 刘燚栋 黄爱华 GAO Dong;LIU Yi-Dong;HUANG Ai-Hua(AECC Commercial Aircraft Engine Co.Ltd,Shanghai 200241,China)

机构地区：[1]中国航发商用航空发动机有限责任公司,上海200241

出　　处：《现代技术陶瓷》2024年第5期434-445,共12页Advanced Ceramics

摘　　要：以Gd_(2)O_(3)、Yb_(2)O_(3)、Y_(2)O_(3)和ZrO_(2)粉末作为原料,通过固相合成技术成功制备了Gd_(2)O_(3)、Yb_(2)O_(3)、Y_(2)O_(3)共掺杂Zr O_(2)陶瓷粉末(简称MRC-YSZ)及Yb_(2)O_(3)掺杂的Gd_(2)Zr_(2)O_(7)陶瓷粉末(简称Yb-GZO),并利用固相烧结技术将上述两种粉末制备成电子束物理气相沉积用陶瓷靶材。在此基础上对两种靶材的相组成、微观结构以及热物理性质进行了比较分析,并对两种靶材的沉积行为进行了研究。研究结果表明,相较于MRC-YSZ陶瓷靶材,Yb-GZO靶材在高温下的热稳定性更为优异,且Yb-GZO靶材的热扩散系数和热导率显著低于MRC-YSZ,但值得注意的是,其热导率随温度的升高呈现出先降低后增加的趋势。这一现象表明,随着温度的上升,Yb-GZO靶材的导热机制机制可能由声子导热转变为声子-光子混合导热为主。在沉积特性方面,研究表明两种靶材均能形成具有柱状晶结构的陶瓷涂层,而沉积过程中Yb和Y元素的偏析现象是靶材成分设计时需要特别关注的。与MRC-YSZ涂层相比,Yb-GZO涂层展现出较低的热导率,这与两种靶材的性能差异是一致的。Gd_(2)O_(3),Yb_(2)O_(3),Y_(2)O_(3)co-doped ZrO_(2)(MRC-YSZ)powders and Yb_(2)O_(3)doped Gd_(2)Zr_(2)O_(7)(Yb-GZO)powders are obtained respectively with Gd_(2)O_(3),Yb_(2)O_(3),Y_(2)O_(3),ZrO_(2)as raw materials via solid synthetic reaction,and then two different ceramic ingots used for electron beam–physical vapor deposited thermal barrier coatings are prepared by solid sintering method.The microstructure,phases and thermo-physical properties of the ingots are investigated and compared.The experimental results indicate that the Yb-GZO ingot possesses better thermal stability in comparison to that of the MRC-YSZ ingot,and its thermal diffusivity and thermal conductivity at high temperatures are significantly lower than that of MRC-YSZ,but it is worth noting that its thermal conductivity exhibits a tendency of decreasing and then increasing with the increase of temperature.This phenomenon suggests that the thermal conductivity mechanism of the Yb-GZO ingot may change from phonon thermal conductivity to mixed phonon-photon thermal conductivity with the increase of temperature.In terms of deposition characteristics,it is shown that both of the two type ingots can obtain ceramic coatings with a columnar crystal structure,while the segregation of Yb and Y elements during the deposition process is a special concern for the ingot composition design.Compared with the MRC-YSZ coating,the Yb-GZO coating exhibits a lower thermal conductivity,which is consistent with the difference in the properties of the two ingots.

关 键 词：热障涂层 陶瓷靶材 稀土 锆酸钆 热导率 

分 类 号：TQ174[化学工程—陶瓷工业]