【摘要】 采用阳极氧化和微弧氧化方法对5A06铝合金进行表面绝缘化处理,并对试样膜层的形貌、物相、绝缘电阻、漏电流、击穿电压和抗液氮冲击等性能进行了研究。结果表明,5A06阳极氧化膜为非晶相,而微弧氧化膜主要为晶相γ-Al2O3。无论是阳极氧化膜还是微弧氧化膜,干燥条件下的交流和直流击穿电压均较潮湿条件下的高;相同电流模式下,氧化膜越厚,耐击穿电压越高。无论干燥或潮湿环境,在膜厚相近的情况下,阳极氧化膜的耐电压击穿能力优于微弧氧化膜的,而干燥环境中微弧氧化膜的绝缘电阻率要高于阳极氧化膜的。阳极氧化膜和微弧氧化膜与5A06基体的结合良好,可经受液氮的数次热冲击。阳极氧化膜和微弧氧化膜的高绝缘性和优异的抗热冲击能力使其有望用于低温电力设备的绝缘装置。更多还原

【Abstract】 In this paper,anodic oxidation and microarc oxidation method were adopted to form insulating films on 5A06 aluminum alloy.The microstructure,phase,insulance,leak current and breakdown voltage of the films were investigated covering thermal shock ability of the films against liquid nitrogen.The results showed that the microarc oxidation film is composed of γ-Al2O3 while the anodic oxidized film is composed of noncrystalline phase.For the anodic oxidized film and the microarc oxidized film,the breakdown voltage at DC or AC mode are both higher under dry circumstance than that under moist circumstance.Under the same current mode,the thicker the film,the higher the breakdown voltage is.For a given film thickness,the anodic film’s ability against voltage breakdown is higher than that of microarc oxidation on matter under dry or moist circumstance,while under dry circumstance the insulation resistance rate of microarc oxidized film is higher than that of anodic oxidized film.Several thermal shocks of the anodic oxidized film and microarc oxidized film against liquid nitrogen show that the interface bonding between oxidation film and 5A06 aluminum alloy is strong.Owing to the good insulating properties and thermal shock performance,the anodic oxidized film and microarc oxidized film can be applied to electric power equipments working in low temperature.更多还原