LC4表面纳米SiC和PTFE双颗粒复合阳极氧化膜的制备

Preparation of Composite Anode Oxide Film with Nano-SiC and PTFE Double Particles on the Surface of LC4 Aluminum Alloy

以250 g/L硫酸+15 g/L草酸为基础电解液,通过添加2 g/L表面改性的纳米SiC颗粒和15 ml/L PTFE乳液,组成双颗粒复合阳极氧化电解液,利用脉冲电源在LC4铝合金表面制备双颗粒复合的阳极氧化膜.结果表明:在脉冲电源频率80 Hz、占空比80%、电流密度3 A/dm2、温度0℃、氧化时间40 min等条件下,在LC4铝合金表面成功制备出厚度为20μm,硬度为4 340 MPa的双颗粒复合的Al2O3-SiC-PTFE阳极氧化膜;复合氧化膜结构中存在着大量的微米级的孔隙缺陷为复合沉积双颗粒提供了复合场所,形成了具有纳米SiC颗粒增强膜的硬度和PTFE颗粒增强膜的自润滑性能的双颗粒复合氧化膜.

Using 250 g/L H2SO4 and 15 g/L H2C2O4 as the basic electrolyte, by adding 2 g/L surface modified nano-SiC particles and 15 ml/L PTFE emulsion, a kind of double particle composite anodizing electrolyte was composed. A composite anode oxide film with double particles was prepared on the surface of LC4 aluminum alloys using pulse power supply. The results showed that under the anodic oxidation processing condition such as the oxidation temperature of 0 0（7, the current density of 3.0 Adm^-2, the duty ratio of 80% , and the oxidation time of 40 min, a double particle Al2O3-SiC-PTFE composite anodic oxide film with thickness of 20 μm and the hardness 4 340 MPa was successfully prepared on the surface of the LC4 aluminum alloy. There were a lot of micron pore defects in the structure of the composite oxide film, which provided composite places for the composite deposition of the double particles. A double particle composite film that has nano SiC particles reinforced hardness and PTFE particle reinforced self lubricating properties was formed.