The mechanisms of cracks formation of silver-based contact materials under arc and making pressure

• 来源期刊: 煤炭学报（英文版）
• 年，卷（期）: 2004,（1）
• 页码范围: 73-77
• 页数: 5页
• 语种: 英文

摘要

The arc erosion experiments on five kinds of silver-based contact materials, AgZnO (10), AgSnO2 (8.5) In2O3 (4), AgCdO (12), AgNi(10), AgWC(12)C(3) were carried out according to different breaking times, breaking currents, and making pressures. Then based on the theoretical analysis and the photographs taken by scanning electronic microscope with EDAX analyzer, the crack morphology was studied scientifically. Three types of cracks, which are cavity cracks, grain boundaries (or phase boundaries) slipping cracks, and thermal stress cracks, were put forward under arc and making pressure through establishing their physical models and discussing their formation mechanisms.