With aluminum alloy piston of automobile engine as the research object, a thermal insulation performance analysis simulation model of plasma spraying coating was established, the influences of bonding layer material and porosity on thermal insulation performance of coating were analyzed comprehensively, and the thermal insulation performance of coating sample block was verified by test. The test results show that, the thermal insulation coating can significantly reduce the temperature of piston metal matrix, and the thermal insulation performance of ZrO2 thermal insulation layer +NiCrAlY bonding layer is the best. With the increase of porosity of bonding layer, the thermal insulation performance of coating improves, but the mechanical bonding strength between coating and matrix decreases due to excessive porosity, considering the results of thermal insulation and bonding strength, the best material for bonding layer is NiCrAlY, and the best porosity is 10%. After spraying the thermal insulation coating, the equivalent thermal stress value of the piston meets the design requirements of the product under actual working conditions.
| 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 |