【摘要】 碳化硅是目前使用最为广泛的陶瓷材料之一,但其机械加工困难带了较高的成本。笔者采用热压烧结工艺于1850℃/30MPa制备了不同纳米TiN含量的TiN-SiC复合陶瓷并研究了其力学性能与导电性能。纳米TiN的加入起到了显著的增强效果,其中加入25wt%和40wt%TiN的复合陶瓷的抗弯强度都超过了800MPa;随着TiN含量的增加,复合材料的电阻率逐渐降低。当TiN含量超过35wt%时,材料电阻率发生突变迅速降低,当TiN含量达到40wt%时电阻率达到了4.92×10^-3Ω·cm,此时材料可以进行有效的电火花加工。更多还原

【Abstract】 Silicon carbide is one of the most widely used ceramic materials at present,but its machining difficulty brings high cost.TiN-SiC composite ceramics with different nano-TiN contents were prepared by hot pressed sintering method at 1850℃/30 MPa.Effects of TiN content onthe electrical conductibility behavior of the ceramics was investigated.The addition of nano-TiN has the remarkable enhancement effect;the bending strength of composite ceramic both 25wt% and40wt% TiN are more than 800MPa;with the increase of TiN content,the resistivity of the composite decreases gradually.When the content of TiN is beyond 35wt%,the electrical resistivity of the composite ceramics presented an abrupt decrease and when the TiN content reaches 40wt%,the resistivity reaches 4.92×10^-3Ω·cm,which can be effectively machined by electrical discharge machining.更多还原