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将纯钛渗硼方法合成的面心立方TiB导电陶瓷粉末作为填料,制作了树脂基陶瓷导电胶。研究了陶瓷导电胶的电性能。导电胶的体电阻率随着面心立方TiB粉末含量的变化而变化。面心立方TiB陶瓷粉末填充型导电胶表现出与金属填充型导电胶相同的逾渗行为,渗流阈值出现在面心立方TiB陶瓷粉末含量为60%时。当面心立方TiB含量为75%时获得了最小体电阻率,0.1Ω·cm。为检验力学性能的可靠性,进行拉伸试验,测量不同TiB粉末含量导电胶的剪切强度,发现剪切强度随着面心立方TiB粉末含量的增加而降低,当TiB粉末含量为70%时,剪切强度约为12.26 MPa。制备了铜粉添加型导电胶用作对比,评估了2种导电胶的抗氧化性能。结果表明,陶瓷导电胶具有优异的抗氧化性能和良好的稳定性。
The surface-centered cubic TiB conductive ceramic powder synthesized by pure titanium boronizing method was used as a filler to prepare a resin-based ceramic conductive adhesive. The electrical properties of ceramic conductive paste were studied. The volume resistivity of the conductive paste varies with the content of the face-centered cubic TiB powder. The face-centered cubic TiB ceramic powder-filled conductive paste exhibits the same percolation behavior as the metal-filled conductive paste, with the percolation threshold occurring when the face-centered cubic TiB ceramic powder content is 60%. The minimum volume resistivity of 0.1 Ω · cm was obtained when the face-centered cubic TiB content was 75%. In order to test the reliability of the mechanical properties, the tensile test was conducted to measure the shear strength of the conductive adhesive with different content of TiB powder. It was found that the shear strength decreased with increasing the content of face-centered cubic TiB powder. When the content of TiB powder was 70% , The shear strength is about 12.26 MPa. A copper powder-added conductive paste was prepared for comparison, and the antioxidant properties of the two kinds of conductive paste were evaluated. The results show that the ceramic conductive adhesive has excellent oxidation resistance and good stability.