TiB-Ti基金属陶瓷的燃烧合成

通过自蔓延高温燃烧合成 ,结合准热等静压工艺 (SHS/PHIP)制备了相对密度超过 94%的TiB xTi基金属陶瓷复合材料 ,研究了金属Ti含量对燃烧合成TiB Ti基金属陶瓷复合材料的影响。研究结果表明 :随着Ti含量的增加 ,绝热温度、燃烧温度和燃烧速度均降低 ,反应产物主要由TiB和Ti两相组成 ,部分产物还有TiB2 相存在 ,产物组织中 ,TiB相主要有针状、棒状和片状等形态 ,增强相的尺寸随Ti含量的增加而减小 ;随Ti含量的增加 ,产物的抗弯强度、抗拉强度、抗压强度和断裂韧性提高 ,且在Ti含量为 40 % (质量分数 )时达到最大值

Combustion synthesis of TiB-Ti cermets

The TiB-Ti cermets with high relative density were fabricated by self-propagating high temperature synthesis and pseudo hot isostatic pressing (SHS/PHIP) process. The effect of Ti content on TiB-xTi cermets was investigated. The adiabatic temperatures, combustion temperatures and combustion velocity decrease with Ti content increasing for TiB-xTi system. The synthesized TiB-Ti cermets mainly consist of TiB and Ti phases, but little TiB 2 phase exists in some products. TiB phase has three morphologies, i.e. needle-like, rod-like, plate-like, in the microstructure of synthesized TiB-xTi composites. The size of TiB grain decreases with an increasing amount of metal addition. The introduction of Ti into TiB-xTi cermets results in a drastic increase in the bending strength, tensile strength, compression strength, fracture toughness, and the maximum value is obtained with the addition of 40%Ti(mass fraction). It is proved that 40% metal content is the optimal constituent for synthesized TiB-Ti cermets.