石墨烯/纳米Al2O3增韧Ti(C,N)基金属陶瓷的力学及摩擦磨损性能

采用真空热压烧结工艺制备了石墨烯(GNPs)和纳米Al₂O₃增韧的Ti(C,N)基金属陶瓷复合刀具材料(TAG)。研究了GNPs和纳米Al₂O₃对复合陶瓷材料微观结构、力学性能和摩擦磨损性能的影响。研究表明，GNPs和纳米Al₂O₃的添加对复合陶瓷材料的力学性能有明显的提高，当GNPs和纳米Al₂O₃含量(质量分数)为1%和5%时，复合刀具陶瓷材料(TA5G1)综合力学性能最优，其硬度、抗弯强度和断裂韧性分别为21.50 GPa、810.80 MPa和10.51 MPa·m^1/2。研究了复合刀具材料的摩擦磨损性能和磨损机理，研究结果表明，在TAG复合刀具材料中，TA5G1的摩擦磨损性能最优，其摩擦系数和磨损率分别为0.338和4.921×10^-6 mm³/(N·m),复合刀具材料的主要磨损形式为磨粒磨损和黏着磨损。

Mechanical properties and friction and wear properties of graphene/ nano-Al2O3 toughened Ti(C,N)-based cermets

Graphene (GNPs) and nano-Al₂O₃ toughened Ti(C,N)-based cermet composite tool materials were prepared by vacuum hot pressing sintering furnace. The effects of GNPs and nano-Al₂O₃ on the microstructure, mechanical properties, and friction and wear properties of composite ceramics were studied. The research showed that the addition of GNPs and nano-Al₂O₃ significantly improved the mechanical properties of the composite ceramic materials. When the content of GNPs and nano-Al₂O₃ was 1wt.% and 5wt.%, the composite tool ceramic material (TA5G1) had the best comprehensive mechanical properties. The hardness, flexural strength, and fracture toughness were 21.50 GPa, 810.80 MPa, and 10.51 MPa·m^1/2, respectively. The friction and wear properties and wear mechanism of the composite tool materials were studied. Results showed that the composite material TA5G1 had the best friction and wear properties among TAG materials, and its friction coefficient and wear rate were 0.338 and 4.921×10^-6 mm³/(N·m) respectively. The main wear forms of the materials were abrasive wear and adhesive wear.