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作 者:郭磊[1,2] 李广[1] GUO Lei;LI Guang(School of Material Science and Technology,Tianjin University,Tianjin 300072,China;Tianjin Key Laboratory of Advanced Joining Technology,Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education,Tianjin University,Tianjin 300072,China)
机构地区:[1]天津大学材料科学与工程学院,天津300072 [2]天津市现代连接技术重点实验室先进陶瓷与加工技术教育部重点实验室,天津300072
出 处:《现代技术陶瓷》2020年第3期186-194,共9页Advanced Ceramics
基 金:国家自然科学基金(51971156)。
摘 要:GdPO4是一种极具应用潜力的热障涂层材料,但其断裂韧性有待进一步提升。本文在GdPO4中掺杂SiCw,研究了二者的高温相容性以及反应产物相组成,探究了SiCw掺杂量对断裂韧性的影响。研究结果表明,掺杂有SiCw的GdPO4在高温下发生两相反应:SiCw掺杂量为10 mol%时,反应产物为Gd9.33(SiO4)6O2和SiO2;掺杂量为20 mol%时,反应产物为SiO2、Gd2Si2O7和Gd9.33(SiO4)6O2;更高掺杂量(30 mol%)时,反应产物基本为Gd2Si2O7。反应形成的新相对GdPO4有较明显的增韧作用。当SiCw掺杂10 mol%时,复合材料的断裂韧性比纯GdPO4提高20%左右,达到1.37 MPa•m^1/2±0.1 MPa•m^1/2。韧化机理在于新形成的第二相有助于降低裂纹尖端扩展驱动力且产生细晶强化。此外,反应形成的Gd9.33(SiO4)6O2具有较低的热导率,有利于涂层材料的隔热性能。GdPO4 is a potential thermal barrier coating material,but its fracture toughness needs to be further improved.In this study,SiCw was doped into GdPO4 and their high-temperature compatibility,the formed reaction products,and effects of doping on the fracture toughness were investigated.The results showed that SiCw and GdPO4 underwent chemical reactions,and the reaction products were doping content dependent:at 10 mol%doping,they were composed of Gd9.33(SiO4)6O2 and SiO2,and turned to SiO2,Gd2Si2O7 and Gd9.33(SiO4)6O2 when the doping content was 20 mol%;At a higher doping amount(30 mol%),the reaction product was basically Gd2Si2O7.The reaction products had positive effects on the fracture toughness.The composite with 10 mol%SiCw had a fracture toughness of 1.37 MPa·m^1/2±0.1 MPa·m^1/2,about 20%higher than that of pure GdPO4.The toughening mechanism is that the newly formed phase can reduce the driving force for crack propagation and produce fine grain strengthening.In addition,Gd9.33(SiO4)6O2 has a low thermal conductivity,which benefits to the thermal insulation performance of the coating.
分 类 号:V232[航空宇航科学与技术—航空宇航推进理论与工程]
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