La_(2)(Ce_(0.3)Zr_(0.7))_(2)O_(7)⁃NiCr_(2)O_(4)材料高温红外发射率研究  

Study on the high temperature infrared emissivity of La_(2)(Ce_(0.3)Zr_(0.7))_(2)O_(7)⁃NiCr_(2)O_(4)material

作　　者：裴训 谢敏[1,2] 李瑞一 刘洋 PEI Xun;XIE Min;LI Ruiyi;LIU Yang(Materials and Metallurgy School,Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia Autonomous Region Key Laboratory of Advanced Ceramic Materials and Devices,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古科技大学内蒙古自治区先进陶瓷材料与器件重点实验室,内蒙古包头014010

出　　处：《内蒙古科技大学学报》2023年第3期248-252,共5页Journal of Inner Mongolia University of Science and Technology

基　　金：内蒙古自治区“高等学校青年科技人才发展项目资助项目”(NJYT23008);内蒙古自治区高等学校科学研究资助项目(NJZZ23055).

摘　　要：固相法合成了La_(2)(Ce_(0.3)Zr_(0.7))_(2)O_(7)-nNiCr_(2)O_(4)(n=0%,5%,10%,15%)陶瓷材料,利用X射线衍射仪、扫描电镜以及傅里叶变换红外光谱仪对其物相结构、显微形貌、高温红外发射率以及红外吸收光谱进行表征.结果表明:合成的La_(2)(Ce_(0.3)Zr_(0.7))_(2)O_(7)-nNiCr_(2)O_(4)陶瓷材料均为以烧绿石晶体为主相的立方结构,显微结构致密,晶粒尺寸均匀且随NiCr_(2)O_(4)含量的增加而增大.随NiCr_(2)O_(4)(n=0%,5%,10%,15%)质量分数的增加,陶瓷材料1100℃红外发射率(3~5μm)不断升高,n=15%时,高温红外发射率最高可达0.76.红外吸收光谱分析结果显示,NiCr_(2)O_(4)的掺入使晶体结构中Zr—O键伸缩振动发生了明显的变化,晶格振动增强,最终材料的红外发射率提升.La_(2)(Ce_(0.3)Zr_(0.7))_(2)O_(7)-nNiCr_(2)O_(4)(n=0,5,10,15 wt.%)ceramics were synthesized by solid state method.X⁃ray diffrac⁃tometer,scanning electron microscope and Fourier transform infrared spectrometer were used to study the phase structure,microstruc⁃ture,high temperature infrared emissivity and infrared absorption spectrum of the ceramic material,respectively.The results show that the synthesized La_(2)(Ce_(0.3)Zr_(0.7))_(2)O_(7)-nNiCr_(2)O_(4)ceramics has cubic pyrochlore as the main phase.The average grain size of the high density sintered ceramic increases with increasing amount of NiCr_(2)O_(4).The infrared emissivities between 3-5μm at 1100℃increase continuously with increasing NiCr_(2)O_(4)content(n=0,5,10,15)and reach to 0.76 while n=15%.As shown in the infrared absorp⁃tion spectrum,the enhancement vibrations of Zr—O bond and lattice caused by doping NiCr_(2)O_(4)finally lead to the increase in the infra⁃red emissivity of the ceramics.

关 键 词：热障涂层 红外发射率 NiCr_(2)O_(4) 稀土锆酸盐 

分 类 号：TG174.45[金属学及工艺—金属表面处理] TQ174[金属学及工艺—金属学]