TiBN粉体的合成、微观结构及其导电性能研究

Synthesis, Microstructure and Electrical Conductance of TiBN powder

摘要:

采用渗硼烧结法合成了一种新型TiBN粉体材料，它是B在TiN中形成的固溶体。TiBN粉体颗粒具有特殊的微纳米复合结构，由尺寸可达到纳米级的TiBN晶体和非晶所组成，非晶多分布在颗粒边界，最小厚度为2nm左右。TiBN粉末兼有陶瓷性和金属性，电阻率为2.655 × 10-5Ωm，优于TiN、TiB2、TiCN等陶瓷材料。该新方法可以在580℃+1h 条件下合成出单相TiN粉末材料，合成温度比现有TiN 合成温度降低500℃以上。TiBN粉末材料可用于制备电接触材料、结构陶瓷材料，同时在作为锂电池、超级电容器、燃料电池和光伏电池的电极、集电体方面有诱人的研究价值和广阔的应用前景。

Abstract:

In this paper, a TiBN nano-powder was synthesized by boronizing sintering method to form a solid solution of B in TiN crystalline structure. TiBN powder exhibits a specific micro-nano composite structure composed of TiBN crystals and an amorphous nanometer-sized layer. The amorphous structure is mostly distributed along particle boundaries with a minimum thickness of 2 nm. TiBN powder shows combined ceramic and metallic properties, and its electrical resistivity is 2.986×10-5 Ωm (better than that of TiN, TiC, TiCN, and TiB2). Solid dissolution of B into TiN increases number of valence bands and conduction bands near Fermi level, contributing to excellent electrical conductivity of TiBN powder. This proposed method can synthesize single-phase TiBN powder at 580 ℃ in 1 h, a synthesis temperature 500 ℃ lower than existing TiN synthesis temperatures. This TiBN powder synthesis route can be used to prepare bulk materials in engineering materials industry. In addition, it has attractive research value and broad application prospects in photovoltaic cells and energy storage collector applications including lithium batteries, supercapacitors, and fuel cells.