【作者】 徐强； 潘伟； 王敬栋； 齐龙浩； 苗赫濯； Kazutaka Mori； Taiji Torigoe；

【Author】 Xu Qiang Pan Wei Wang Jingdong Qi Longhao Miao HezhuoKazutaka Mori Taiji Torigoe ( State Key Laboratory of New Ceramics and Fine Processing, Department ofMaterials Science and Engineering,Tsinghua University,Beijing,100084)( TAKASAGO Research & Development Center,MITSUBISHI Heavy Industries,LTD. ,HYOGO.,676-8686,Japan)

【机构】 清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室； TAKASAGO Research & Development Center,MITSUBISHI Heavy Industries,LTD.,HYOGO,676-8686,Japan；

【摘要】 以Dy2O3和ZrO2为原料,通过高温固相反应合成了Dy2Zr2O7陶瓷,对该陶瓷的相组成、微观组织以及热物理性能进行了研究。XRD结果显示固相反应合成了单相的、具有萤石结构的Dy2Zr2O7陶瓷;微观组织观察表明,合成产物组织比较致密,陶瓷颗粒之间没有其他相存在;随着温度的升高,陶瓷的线膨胀系数呈逐渐增加的趋势,而热导率逐渐降低。Dy2Zr2O7陶瓷的热物理性能测试结果表明该陶瓷的线膨胀系数与传统的YSZ陶瓷相当,而热导率大大低于YSZ陶瓷,Dy2Zr2O7陶瓷具有低热导率的主要原因是该陶瓷中存在较多的氧空位以及置换原子的原子量较大。这些都预示着Dy2Zr2O7陶瓷可以作为热障涂层系统中的陶瓷层候选材料。更多还原

【Abstract】 Dy2Zr2O7 ceramie was prepared by high-temperature solid state reaction from Dy2O3 and ZrO2 powders and the phase composition, microstructure, thermophysical properties of the material were investigated. XRD results showed that single phase Dy2Zr2O7 ceramic was synthesized by solid state reaction with fluorite structure and the SEM showed that the microstructure of the product was dense and no other phases existed among the particles. With the temperature increasing, the thermal expansion coefficient of the ceramic increased, while the thermal conductivity decreased. The thermophysical re- suits of Dy2Zr2O7 ceramic indicated that the thermal expansion coefficient of the ceramic was equivalent to that of conventional YSZ and the thermal conductivity of Dy2Zr2O7 ceramic was much lower than that of YSZ. The lower thermal conductivity of Dy2Zr2O7 ceramic was mainly attributed to more oxygen vacanciesand larger atomic weight of substitutional atom. These results imply that Dy2Zr2O7 ceramic ean be used as the candidate material for the ceramic layer in thermal barrier coatings system.更多还原