【摘要】 采用热压烧结在1680℃下制备得到了（100-x）B₄C-x Ti（x=0⁴0）（质量分数,%）陶瓷,并研究了Ti（x=0⁴0）添加量对B₄C陶瓷微观形貌及力学性能的影响。结果表明:Ti元素可以促进B₄C陶瓷的烧结,其相对密度随Ti含量增加先增大后趋于稳定,当Ti添加量达到40%时,样品相对密度约为99.5%。XRD结果表明,样品中除B₄C和未反应的Ti之外,还有Ti C和Ti B₂相出现,且随Ti含量增加,两者的衍射峰逐渐增强;随Ti添加量增加,样品的抗弯强度、硬度以及断裂韧性均增大,在Ti添加量为40%时,分别达到481 MPa、8280 MPa、18.55 MPa·mm^1/2。分析其原因认为,由于Ti与B₄C发生界面反应,在界面处生成Ti C和Ti B₂相过渡层,联结了B₄C基体与Ti,起到了桥联增韧的作用,使材料的力学性能得到改善。更多还原

【Abstract】 The（100-x）B₄C-x Ti（wt%）（x=0⁴0）ceramics were prepared by hot press sintering at 1680°C,and the effect of Ti doping（x=0⁴0）on the microstructure and the mechanical properties of B₄C ceramic was investigated.The results show that Ti promotes the sintering of B₄C ceramic;its relative density increases firstly,and then it tends to be stable.The relative density of the sample is 99.5%,when Ti doping amount gets up to 40 wt%.The XRD results show that in addition to the B₄C and unreacted Ti,there are Ti B₂ and Ti C phase,and with the increase of Ti content,the diffraction peaks of those two phase gradually increase.With increase of Ti content,the bending strength,hardness and fracture toughness of samples increase.When the doping amount is 40 wt%,they reach（481±24）MPa,（8280±410）MPa,（18.55±0.9）MPa·mm^1/2,respectively.The reason is that Ti interface reaction with B₄C generates Ti C and Ti B₂ phase transition layer in the interface,which connects the B₄C substrate and Ti,and plays an important role in bridging toughening;thus mechanical performance of the material is improved.更多还原