高纯Ti2AlC粉末的无压制备及其在Ag基电触头材料的应用

Ag基电触头是低压开关的“心脏”, 触头无Cd化一直困扰着人们, 寻找新型环保电触头材料是目前低压开关领域研究的重点。本研究从Ag基电触头增强相材料设计入手, 利用简单快速的无压技术合成了高纯Ti₂AlC粉末(99.2%), 制备的Ag/Ti₂AlC复合电触头材料组织均匀、Ti₂AlC颗粒与Ag基体结合紧密、相对密度高(95.7%)、硬度适中(96HV)、导电性好(电阻率低至79.5 nΩ·m)、抗电弧侵蚀性能优良(5610次电弧放电后触头质量损失仅为4.4wt%)。Ag/Ti₂AlC优良的结构和性能主要归因于Ti₂AlC本身的导电导热性能和Ag/Ti₂AlC之间的润湿性。该复合材料在进一步深入研究后, 有望大面积应用并替代传统电触头材料。

High-purity Ti2AlC Powder: Preparation and Application in Ag-based Electrical Contact Materials

Ag-based electrical contact is the "heart" of low-voltage switch, and the Cd toxicity has long been a haunting problem. It is the research focus of the low-voltage switch to find new environment-friendly electrical contact materials. Starting from the design of reinforcement for Ag-based electrical contact in this work, the high-purity Ti₂AlC powder (99.2%) was synthesized by a simple and fast pressureless technique. Ag/Ti₂AlC composite electrical contact material was also prepared with homogeneous structure, good bonding between Ag and Ti₂AlC particles, high relative density (95.7%), moderate hardness (96HV), satisfactory electrical conductivity (low resistivity of 79.5 nΩ·m), and favorable arc erosion resistance (mass loss of 4.4% after 5610 arc discharging cycles). These excellent structure and properties of Ag/Ti₂AlC composite are mainly attributed to the good thermal and electrical conductivity of Ti₂AlC and the good wettability between Ag and Ti₂AlC. This composite is expected to replace the conventional electrical contact materials in the future.