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<p>To improve the poor anti-welding performance of silver-titanium silicon carbide (Ag/Ti<sub>3</sub>SiC<sub>2</sub>) electrical contact materials (ECMs), silver-titanium silicon carbide-graphite (Ag–Ti<sub>3</sub>SiC<sub>2</sub>–C) ECMs were synthesized through a novel preparation method of environmentally friendly electroless silver plating, vacuum sintering, hot pressing, and annealing. The effect of graphite content on the microstructure and properties of Ag–Ti<sub>3</sub>SiC<sub>2</sub>–C ECMs was systematically investigated. No new phase was formed in the composites containing graphite. In Ag–Ti<sub>3</sub>SiC<sub>2</sub>–C composites, as the graphite content increased, relative density first increased and then decreased. Hardness decreased steadily, while resistivity increased slightly. During arc erosion, material transfer occurred from anode to cathode. When the graphite addition increased from 0&#xa0;wt% to 0.5&#xa0;wt%, material transfer increased sharply, then declined with further addition up to 1.5&#xa0;wt%. Arc energy and duration followed a similar trend, that is, decreasing initially and then increasing, while contact resistance increased continuously. Average welding force consistently decreased from 385.22&#xa0;cN to 111.06&#xa0;cN with the addition of graphite from 0&#xa0;wt% to 1.5&#xa0;wt%. Graphite addition dispersed arc, reduced localized heat accumulation, and protected the skeleton structure of the reinforced phase. These effects suppressed arc-induced damage, improving both arc erosion resistance and anti-welding performance. The composite containing 1.0&#xa0;wt% graphite demonstrated optimal overall properties, with a resistivity of 2.492&#xa0;μΩ&#xa0;cm, hardness of 82.46&#xa0;HV, and an electrical service life of 3007 operations under DC 72&#xa0;V/32 A—representing a 97% increase over the graphite-free Ag/Ti<sub>3</sub>SiC<sub>2</sub> composite.</p>

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Effect of graphite addition on the anti-welding performance and electric performance of Ag–Ti3SiC2–C electrical contact materials

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Lingling Chen,
  • Yong Zheng,
  • Zhao Li,
  • Xi Zhang,
  • Qian Wang,
  • Heng Zhao

摘要

To improve the poor anti-welding performance of silver-titanium silicon carbide (Ag/Ti3SiC2) electrical contact materials (ECMs), silver-titanium silicon carbide-graphite (Ag–Ti3SiC2–C) ECMs were synthesized through a novel preparation method of environmentally friendly electroless silver plating, vacuum sintering, hot pressing, and annealing. The effect of graphite content on the microstructure and properties of Ag–Ti3SiC2–C ECMs was systematically investigated. No new phase was formed in the composites containing graphite. In Ag–Ti3SiC2–C composites, as the graphite content increased, relative density first increased and then decreased. Hardness decreased steadily, while resistivity increased slightly. During arc erosion, material transfer occurred from anode to cathode. When the graphite addition increased from 0 wt% to 0.5 wt%, material transfer increased sharply, then declined with further addition up to 1.5 wt%. Arc energy and duration followed a similar trend, that is, decreasing initially and then increasing, while contact resistance increased continuously. Average welding force consistently decreased from 385.22 cN to 111.06 cN with the addition of graphite from 0 wt% to 1.5 wt%. Graphite addition dispersed arc, reduced localized heat accumulation, and protected the skeleton structure of the reinforced phase. These effects suppressed arc-induced damage, improving both arc erosion resistance and anti-welding performance. The composite containing 1.0 wt% graphite demonstrated optimal overall properties, with a resistivity of 2.492 μΩ cm, hardness of 82.46 HV, and an electrical service life of 3007 operations under DC 72 V/32 A—representing a 97% increase over the graphite-free Ag/Ti3SiC2 composite.