Ta_(2)O_(5)-Y_(2)O_(3)掺杂剂对氧化锆相结构、断裂韧性和热物理性能的影响  

Effect of TaO-YO Dopants on Phase Structure, Fracture Toughness and Thermophysical Properties of Zirconia

作　　者：陈东[1] 王全胜[1] 柳彦博[1] 宁先进[1] Chen Dong;Wang Quansheng;Liu Yanbo;Ning Xianjin(School of Material Science and Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学材料科学与工程学院,北京100081

出　　处：《稀有金属材料与工程》2021年第6期1890-1895,共6页Rare Metal Materials and Engineering

基　　金：Natural Science Foundation of Beijing,China (2131006)。

摘　　要：合成制备了一系列的Ta_(2)O_(5)-Y_(2)O_(3)掺杂的ZrO_(2)(TYSZ)。研究了掺杂剂含量对处理相结构、相稳定性、断裂韧性、热膨胀系数和导热系数的影响,同时探讨了应力条件下TYSZ的响应机制。结果表明,掺杂Ta_(2)O_(5)和Y_(2)O_(3)引起的晶格变形有利于t相稳定。但随着掺杂含量的增加,由于应力诱导的t-m相变被抑制和高温下稳定剂析出倾向增加,高温相稳定性和断裂韧性下降。热膨胀系数和热导率的变化则是由晶体结构的混乱程度和晶格膨胀导致的。16TYSZ具有良好的相稳定性、应力敏感性和热物理性能,是先进热障涂层材料的潜在候选材料。A broad range of Ta_(2)O_(5)-Y_(2)O_(3) doped ZrO_(2)(TYSZ) compounds were synthesized. The effects of dopant content on phase structure, phase stability, fracture toughness, coefficient of thermal expansion(CTE), and thermal conductivity were investigated. The TYSZ response mechanism under stress conditions was also explored. Result suggests that the lattice distortion caused by Ta2 O5 and Y2 O_(3) doping favors t phase stabilization. However, as the doping content increases, the high-temperature stability and fracture toughness decrease due to the suppressed stress-induced phase transformation and precipitation. The variation in CTE and thermal conductivity is due to the chaotic and expansive crystal structure. The 16 TYSZ might be the potential candidate for advanced thermal barrier coating materials for its good phase stability, stress-sensitive phase transferability, and thermophysical properties.

关 键 词：热障涂层 相稳定性 断裂韧性 热物理性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TK471[金属学及工艺—金属学]