【摘要】 合成制备了一系列的Ta₂O₅-Y₂O₃掺杂的ZrO₂（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Ta₂O₅和Y₂O₃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。更多还原

【Abstract】 A broad range of Ta₂O₅-Y₂O₃ doped ZrO₂（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 O₃ 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.更多还原