Ti(C,N)基金属陶瓷的研究

Study of Ti(C,N) based Metal Ceramic

研究了合金组成及其含量、烧结工艺、热等静压等对Ｔｉ（Ｃ，Ｎ）基金属陶瓷性能的影响。氮的加入形态、Ｎ／Ｃ、钼、镍、碳对合金性能都有影响。其中，Ｎ／Ｃ比值影响粘结相、硬质相的晶格常数及钼在粘结相和ＳＳ相的溶解量。当ＴｉＮ质量分数增加到２６％或镍质量分数增加到２５％时产生Ｎｉ３Ｍｏ相，缺碳则出现Ｎｉ３Ｔｉ相。真空烧结温度超过１４５０℃，ＴｉＮ分解，造成合金收缩率下降。热等静压处理后，抗弯强度提高了７０％以上，相对密度达到９９６％以上，硬度值（ＨＲＡ）提高了０９～１７。

The influences of alloy composition, sintering and HIP techniques on the properties of the Ti(C,N) based metal ceramic were studied. The results show that the nitrogen addition mode, N/C ratio, concents of Mo, Ni and C have obvious influences on the alloy properties. Different N/C ratios result in different lattice parameters of the binder and the hard phases and different dissolved content of Mo in binder and SS phases. When TiN is added up to 26% or Ni content is over 25%, the Ni 3Mo phase appears; while the lack of C content lead to the appearace of Ni 3Ti phase. When sintered at above 1450℃ in vacuum, the TiN phase is decomposed, which explains the decrease of the shrinkage during sintering. HIP treatment can greatly ameliorate the alloy properties with a improvement of 70% for bending strength and a increase of 0.9～1.7 HRA for hardness, the relative density is higher than 99.6%.