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In order to improve the service life of spot welding electrodes, TiB2-reinforced copper matrix composites were prepared using a multi-step method. The physical phase and microscopic morphology of the TiB2-reinforced copper matrix composites prepared by the multi-step method were analyzed using X-ray diffraction (XRD), metallographic microscopy and scanning electron microscopy (SEM) characterization. By measuring the mechanical property indexes of the composites, it was found that the copper matrix composites prepared by the multi-step preparation had better comprehensive mechanical properties. The copper matrix composites prepared by the multi-step method were processed into spot welding electrodes, its life test results were the highest compared with other comparison samples, with a life time of 1 500 solder joints, which was 2.6 times longer than the life time of common chromium zirconium copper spot welding electrodes.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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