【摘要】 采用热压和放电等离子烧结法分别制备出致密的ZrO₂（3 mol%Y2O3）-20%（质量分数）Al₂O₃陶瓷。采用XRD、SEM、TEM、万能力学试验机和高温摩擦磨损试验机等手段研究了ZrO₂（Y₂O₃）-Al₂O₃陶瓷的组织结构、力学性能和高温摩擦学性能,探讨了高温磨损机理。ZrO₂（Y₂O₃）-Al₂O₃陶瓷由t-Zr O2和α-Al2O3构成,抗弯强度和断裂韧性分别为1413MPa和17.2 MPa·m^1/2。与热压烧结陶瓷相比,SPS烧结陶瓷中t-Zr O2晶粒更细小。SPS烧结ZrO₂（Y₂O₃）-Al₂O₃陶瓷的硬度随测试温度的增加而降低。热压和SPS烧结ZrO₂（Y₂O₃）-Al₂O₃陶瓷的摩擦系数和磨损率都随测试温度的升高而增加。ZrO₂（Y₂O₃）-Al₂O₃陶瓷高温下的磨损机制主要表现为沿晶脆性断裂和剥离磨损。与热压烧结陶瓷相比,SPS烧结ZrO₂（Y₂O₃）-Al₂O₃陶瓷在室温至700℃范围内表现出更好的高温循环滑动摩擦学性能。更多还原

【Abstract】 Hot pressing and spark plasma sintering were used to fabricate dense ZrO₂（3 mol%Y2O3）-20wt% Al2O3 ceramics. X-ray diffraction, scanning electron microscope, transmission electron microscope, universe mechanical tester and high temperature friction and wear tester were employed to investigate the microstructure, mechanical properties, high temperature tribological properties and wear mechanisms of ZrO₂（Y₂O₃）-Al₂O₃ ceramics. The ZrO₂（Y₂O₃）-Al₂O₃ ceramic consists of t-Zr O2 and α-Al2O3 and exhibits a flexural strength of 1413 MPa and a fracture toughness of 17.2 MPa·m1/2. The spark-plasma-sintered ZrO₂（Y₂O₃）-Al₂O₃ ceramic has much finer grains of t-Zr O2 than hot-pressed ZrO₂（Y₂O₃）-Al₂O₃ ceramic。The Vickers hardness of spark-plasma-sintered ZrO₂（Y₂O₃）-Al₂O₃ ceramic decreases with increasing the measurement temperature. Friction coefficients and wear rates of both hot-pressed and spark-plasma-sintered ZrO₂（Y₂O₃）-Al₂O₃ ceramics increase with increasing wear temperature. Intergranular brittle microfracture and delamination wear are dominated in the wear mechanisms of ZrO₂（Y₂O₃）-Al₂O₃ ceramics. The spark-plasma- sintered ZrO₂（Y₂O₃）-Al₂O₃ ceramic exhibits a higher wear resistance than the hot-pressed ceramic during cyclic sliding wear tests in the temperature range from room temperature to 700 °C.更多还原