Strong, tough and high temperature self-lubricated fibrous monolithic ceramic in Al2O3/Cr2O3 system
Strong, tough and high temperature self-lubricated fibrous monolithic ceramic in Al2O3/Cr2O3 system
复制标题
Al2O3/Cr2O3 系强韧高温自润滑纤维整体陶瓷
DOI：
10.1016/j.triboint.2022.107646
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发表时间：
2022
影响因子：
6.2
通讯作者：
Yongsheng Zhang
中科院分区：
文献类型：
--
作者：
Shuna Chen;Yunfeng Su;Qiuan Sun;Hengzhong Fan;Junjie Song;Litian Hu;Yongsheng Zhang
为了实现工程材料中通常相互排斥的高强度和高韧性的良好结合，用Cr2 O3相包裹着Al2 O3纤维细胞构建了纤维单片陶瓷。该材料的断裂方式为非脆性断裂，表现为典型的R曲线上升行为，最大裂纹扩展韧性为9.05 Mpa m1/2。在60 0℃时，摩擦系数最低为0.2 9，磨损率为1.0 7×10−5mm3/Nm。在80 0℃以上，Cr2 O3的热稳定性对其磨损机理有很大影响。·该材料实现了高强度和高韧性的完美结合。·在高温下实现了出色的减摩和耐磨性。
A fibrous monolithic ceramic was constructed with Al 2 O 3 fiber cells surrounded by Cr 2 O 3 phase-two kinds of brittle ceramics, to achieve an excellent combination of high strength and toughness, which is usually mutually exclusive in engineering materials. The material was demonstrated to fail in a non-brittle fracture manner and showed a typical rising R-curve behavior with the maximum crack growth toughness of 9.05 MPa m 1/2 . Meanwhile, the composite ceramic exhibited excellent tribological performance at high temperatures, with the lowest friction coefficient of 0.29 and wear rate of 1.07 × 10 −5 mm 3 /Nm at 600 °C. It was also demonstrated that the thermal stability of Cr 2 O 3 has a great influence on the wear mechanism when the temperature was above 800 °C. • Al 2 O 3 /Cr 2 O 3 fibrous monolithic ceramics showed non-brittle fracture behaviors. • The material realized an excellent combination of high strength and toughness. • Excellent friction reduction and wear resistance achieved at high temperatures.