Full
Outline
To solve the defects of the engine cylinder bore thermal spray materials, namely the brittle fracture of welding wire, the peeling of copper plate layer, and the coating holes, the defect mechanism is clarified through microstructure analysis and full-process process optimization, and corresponding countermeasures are formulated. The results show that the brittle fracture of the imported material is caused by the large amount of hard bainite resulting from composition segregation, which causes cracks during drawing. The electromagnetic stirring, light pressure reduction and "air cooling + slow cooling" process can effectively inhibit bainite and avoid brittle fracture. The peeling of the copper plating layer is mainly due to insufficient bonding force and low mold surface finish. The "alkaline pre-plating + acidic main plating" and diamond coating drawing die can significantly improve it. The coating holes are related to process fluctuations, nozzle slagging and cleanliness. Through real-time monitoring of key parameters, nozzle maintenance and cleanliness system control, the defect rate of holes is reduced by about 70%. This provides a systematic technical path for the development and quality control of high-performance cylinder bore thermal spray materials.
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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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