层状SiC/BN陶瓷的制备及抗冲击性能

For the development of new ceramic armor protection materials with high-performance structure-function integration, layered SiC/BN ceramics with different structural designs were prepared by the tape casting method combined with the hot-pressing sintering method. The sintering characteristics, microstructure, mechanical properties and impact resistance of the materials were studied. The results show that the layered structure design can achieve the strengthening and toughening effect of ceramic materials, and its failure mode is non-brittle fracture, and the ability to maintain structural integrity is significantly improved; the flexural strength is 410 MPa, and the fracture toughness is 7.6 MPa·m~(1/2). The target shooting results show that the layered structure has a good dynamic energy absorption effect and the ability to maintain structural integrity, and can resist the impact of multiple projectiles: the indentation depth is 7.5 mm, the diameter of the fragmentation cone is 40 mm, the dynamic damage is mainly circumferential, and the comprehensive protection ability is significantly improved.

为发展高性能结构功能一体化的新型陶瓷装甲防护材料,采用流延法结合热压烧结法制备了不同结构设计的层状SiC/BN陶瓷,研究了材料的烧结特性、显微结构、力学性能及抗冲击性能。结果表明:层状结构设计可以实现陶瓷材料的强韧化效果,其失效模式为非脆性断裂,保持结构完整性的能力明显提升;弯曲强度410 MPa,断裂韧性7.6 MPa·m~(1/2)。打靶结果表明层状结构具有较好的动态吸能效果与保持结构完整性的能力,可以抵抗多发弹丸冲击:凹陷深度为7.5 mm,破碎锥直径40 mm,动态损伤以环向为主,综合防护能力得到明显提升。