中文摘要：

以B4C粉为主要原料,氮化硼纳米管（BNNTS）为补强增韧剂,无定形B粉为烧结助剂,采用热压烧结工艺制备出高性能BNNTS/B4C陶瓷复合材料.研究了BNNTS含量对BNNTS/B4C陶瓷复合材料显微结构和力学性能的影响.采用硬度计、万能试验机、扫描电镜等手段对样品性能进行了表征.实验结果表明,BNNTS含量为1.5wt.％时,BNNTS/B4C陶瓷复合材料力学性能最佳.弯曲强度、断裂韧性和维氏硬度分别为513.19MPa、6.58MPa· m1/2、38.6GPa,比无BNNTS加入的B4C陶瓷分别提高了28.0％、31.5％、14.0％.掺入BNNTS对B4C基体材料产生残余压应力,使复合材料的断裂韧性有所提高.

英文摘要：

BNNTS/B4C ceramic composites with high mechanical properties were prepared by hot-pressing,using B4C power as the raw material,BNNTS as the toughening agent and amorphous boron powder as the sintering aid.The effect of the BNNTs content on the microstructure and mechanical properties of BNNTS/B4C ceramic composites were studied.The samples were characterized by means of hardness tester,universal testing machine,scanning electron microscopy （SEM）.Results show that BNNTS/B4C ceramic composites with best mechanical properties were achieved when the vontent of BNNTS was 1.5wt.％.And compared with the B4C ceramic without BNNTS,the bending strength,fracture toughness and Vickers hardness of the composites were 513.19MPa,6.58MPa ·m1/2,and 38.6GPa,increased by 28.0％,31.5％,14.0％,respectively.Incorporating BNNTS would generate residual compressive stress in B4C matrix,and improve the fracture toughness of the composites.