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采用三维视频显微金相技术对高硅铝合金缸套材料的组织构成、颗粒尺寸以及碱腐蚀深度进行测试与评价;用激光共聚焦显微镜技术对碱腐蚀界面颗粒凹凸以及表面纹理进行观察与描述;用往复式摩擦磨损实验机对碱腐蚀试样进行摩擦学性能评价。结果表明:高硅铝合金组织中主要由硅颗粒及第二相硬质点颗粒构成,平均硅颗粒尺寸为4.00μm,平均第二相颗粒尺寸为3.05μm;随腐蚀时间、深度的增加,腐蚀界面区域增大,表面凸凹及纹理更加清晰,当碱的质量分数为5%,溶液温度为40℃,腐蚀时间为30~40 s,摩擦学性能最优越。
The structure, particle size and alkali corrosion depth of high silicon aluminum cylinder liner materials were tested and evaluated by three-dimensional video microscopy. The surface roughness and surface texture of alkali corrosion interface particles were observed and described by laser scanning confocal microscopy The tribological properties of alkali-corroded samples were evaluated by reciprocating friction and wear testing machine. The results show that the microstructure of high-silicon aluminum alloy is mainly composed of silicon particles and hard phase particles of the second phase, the average size of silicon particles is 4.00μm and the average size of the second phase particles is 3.05μm. With the increase of etching time and depth, When the mass fraction of alkali is 5%, the solution temperature is 40 ℃, the etching time is 30-40 s, the tribological properties are the best.