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Outline
The improved process combining a polybenzimidazole （PBI） polymer nozzle with axial center powder feeding is employed to study the nozzle clogging behavior and its impact on coating deposition. Multi-scale characterization of the coating morphology and microstructure is carried out using X-ray computed tomography（X-CT）， optical microscopy， and electron backscatter diffraction. The results show that in the existing process， aluminum powder softening causes adhesion to the inner wall of the SiC nozzle， forming clogging materials. This leads to a powder agglomeration on the coating surface and a porosity of 0.32%. In contrast， the PBI nozzle， when used with the axial center feeding process， significantly reduces particle adhesion and forms a uniform gas-solid two-phase flow， enabling continuous and stable deposition. The resulting coating exhibits significant internal particle plastic deformation with the porosity reduced to 0.16%. Based on the optimized process， aluminum metal additive manufacturing experiments are carried out， achieving continuous spraying for 2 h without nozzle clogging and depositing a 38 mm thick coating on an aluminum alloy substrate. X-CT analysis indicates that there are no significant defects at the interface or within the deposit. The in-plane and out-of-plane tensile strengths of the deposit are about 180 MPa and 80 MPa， respectively， indicating significant anisotropy.
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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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