兼备超硬和导电的多功能材料，必将在诸多极端条件下发挥不可替代的作用，具有十分广阔的应用前景和经济效益。然而，硬度和导电两大物理特性却相互矛盾，导致导电超硬领域是一片空白。其本质物理问题在于：产生高硬度特性的共价键（局域电子）与产生导电性的金属键（自由电子）难以共存，存在此消彼长的关系。本项目拟利用微观结构构筑（霍尔-佩奇效应）和过渡金属掺杂（双金属效应），在不损失导电特性的条件下提高材料的硬度。利用高温高压实验方法，拟在高压腔体中设计产生切向力的非静水压，调控Tix(TM)1-xB2的微观结构，增加晶界密度、堆垛层错等；结合化学掺杂调控价电子和电荷密度，开发一类含金属的纳米聚晶双金属Tix(TM)1-xB2导电超硬材料。基于以上思维，前期工作已经制备出具有35 GPa硬度的Tix(TM)1-xB2。该研究将填补超硬材料在导电金属材料领域的空白，具有重要的科学意义和应用前景。

Searching for new superhard conductor materials are focused, because it is irreplaceable and significant to future industrial manufactory. While, superhard materials are still void of metallic materials. The intrinsic reason is high hardness caused by covalent bonds (localized electron) is difficult to coexist with conductivity engendered by metal bonds (free electron) in one material. So searching for a superhard metallic materials are difficult and focused. According to high hardness of 35 GPa in synthesized the conductor transition bimetal borides, in this item, we suggest that avoid the high content of covalent bonds to enhance hardness, but fabricating substructure (Hall-Petch effect) and metal doping (bimetallic effect) to increasing hardness. High pressure and high temperature (HPHT) method will be used to prepare Tix(TM)1-xB2. The density of grain boundary will be modulated with induce non-hydrostatic pressure, and the content of valence electrons and electron density in Tix(TM)1-xB2 will be modulated to uncover the hardness mechanism. Finally, fabricating a kind of superhard conductor materials. This item will not only important for search for new functional superhard materials, but also significant to future industrial development.