典型文献
High-entropy(Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 ceramic:A promising thermal barrier coating material
文献摘要:
Thermal barrier coating(TBC)materials perform an increasingly important role in the thermal or chemical protection of hot components in a gas turbine.In this study,a novel high entropy hafnate(Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 was synthesized by solution combustion method and investigated as a potential TBC layer.The as-synthesized(Y0.2Gd0.2 Dy0.2 Er0.2 Yb0.2)2 Hf2O7 possesses a pure single dis-ordered fluorite phase with a highly homogeneous distribution of rare earth(RE)cations,exhibiting prominent phase stability and excellent chemical compatibility with Al2O3 even at 1300℃.Moreover,(Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 demonstrates a more sluggish grain growth rate than Y2Hf2O7.The ther-mal conductivity of(Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7(0.73-0.93 W mr-1 K-1)is smaller than those of com-ponents RE2Hf2O7 and many high entropy TBC materials.Beside,the calculated thermal expansion coef-ficient(TEC)of(Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7(10.68×10-6/K,1100℃)is smaller than that of yttria-stabilized zirconia(YSZ).Based on the results of this work,(Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 is suitable for the next generation TBC materials with outstanding properties.
文献关键词:
中图分类号:
作者姓名:
Longkang Cong;Wei Li;Jiancheng Wang;Shengyue Gu;Shouyang Zhang
作者机构:
State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;Department of Materials Physics,School of Science,Xi'an University of Posts and Telecommunications,Xi'an 710121,China
文献出处:
引用格式:
[1]Longkang Cong;Wei Li;Jiancheng Wang;Shengyue Gu;Shouyang Zhang-.High-entropy(Y0.2Gd0.2Dy0.2Er0.2Yb0.2)2Hf2O7 ceramic:A promising thermal barrier coating material)[J].材料科学技术(英文版),2022(06):199-204
A类:
2Dy0,2Hf2O7,hafnate,Hf2O7,Y2Hf2O7,RE2Hf2O7
B类:
High,entropy,Y0,2Gd0,2Er0,2Yb0,ceramic,promising,thermal,barrier,coating,Thermal,TBC,materials,perform,increasingly,important,role,chemical,protection,hot,components,gas,turbine,In,this,study,novel,was,synthesized,by,solution,combustion,method,investigated,potential,layer,possesses,pure,single,ordered,fluorite,phase,highly,homogeneous,distribution,rare,earth,cations,exhibiting,prominent,stability,excellent,compatibility,Al2O3,even,Moreover,demonstrates,more,sluggish,grain,growth,than,conductivity,mr,smaller,those,many,Beside,calculated,expansion,coef,ficient,TEC,that,yttria,stabilized,zirconia,YSZ,Based,results,work,suitable,next,generation,outstanding,properties
AB值:
0.429533
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