摘要
氧化钇稳定氧化锆陶瓷是广泛应用的热障涂层陶瓷材料,但在1200℃以上长期服役时存在相稳定性差、烧结加剧和力学性能下降等弊端。基于此,本研究提出采用高温固相反应法制备Gd_(2)O_(3)-Sc_(2)O_(3)-CeO_(2)-ZrO_(2)(GdCSSZ)热障涂层陶瓷材料。通过X射线衍射仪(XRD)、场发射扫描电镜(SEM)和维氏硬度等表征手段,探究Gd_(2)O_(3)掺杂含量对微观组织结构演变行为以及维氏硬度、断裂韧性和弹性模量等力学性能的影响规律。结果表明,1500℃×6 h烧结Gd_(2)O_(3)-Sc_(2)O_(3)-CeO_(2)-ZrO_(2)陶瓷材料的主晶相为t相,特别是当Gd^(3+)掺杂含量大于0.5%(摩尔分数)时,有立方相生成;此外,增加Gd^(3+)掺杂含量可有效抑制ZrO_(2)晶粒的生长,维氏硬度、弹性模量均略增加,断裂韧性略下降。
The yttria-stabilized zirconia is a widely used thermal barrier coating ceramic material,but it has disadvantages such as poor phase stability,serve densification,and decreased mechanical poroperties at 1200 C and above for long-term service.Based on this,this study proposes to prepare the Gd_(2)O_(3)-Sc_(2)O_(3)-CeO_(2)-ZrO_(2) thermal barrier coating ceramic material via the high temperature solid state reaction method.The effects of Gd_(2)O_(3) doping content on the microstructure evolution behavior and mechanical properties,such as Vickers hardness,fracture toughness and young's modulus were systematically analyzed by means of X-ray diffraction(XRD),field emission scanning electron microscopy(SEM)and Vickers hardness tests.The results show that the main crystal phase of Gd_(2)O_(3)-Sc_(2)O_(3)-CeO_(2)-ZrO_(2) ceramic material sintered at 1500℃ for 6 h is the t-phase.In particular,when the Gd^(3+)doping cotent exceeds 0.5%(molar fraction),a cubic phase is formed.Furthermore,increasing the Gd^(3+)doping content can effectively inhibit the growth of ZrO_(2) grains.Both the Vickers hardness and Young's modulus increase slightly,while fracture toughness decreases slightly.
作者
张鑫宇
刘仍谦
王志刚
谢敏
张永和
王炫力
牟仁德
宋希文
ZHANG Xin-yu;LIU Reng-qian;WANG Zhi-gang;XIE Min;ZHANG Yong-he;WANG Xuan-li;MOU Ren-de;SONG Xi-wen(School of Materials Science and Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;Key Laboratory of Green Extraction&Efficient Utilization of Light Rare-Earth Resources Ministry of Education,Inner Mongolia University of Science and Technology,Baotou 014010,China;Surface Engineering Division,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)
出处
《稀土》
北大核心
2025年第4期10-16,共7页
Chinese Rare Earths
基金
国家自然科学基金项目(52204316,52372062)
内蒙古自治区高等学校“青年科技英才支持计划”项目(NJYT23006)。
关键词
热障涂层
稀土掺杂
氧化锆
微观组织
力学性能
thermal barrier coating
rare earth doping
zirconia
microstructure
mechanical property
