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用金相、X光、扫描电子显微镜和俄歇谱仪(AGUER)等对静电复印机用载体铁粉的氧化膜进行了微观分析和研究。结果表明:当载体铁粉氧含量为2％左右时,在其颗粒表面形成的Fe_3O_4膜层,厚度约2μm:当氧含量超过5％时,则载体铁粉中有一部分颗粒的氧化膜层显著加厚,甚至可达5—8μm,这种厚的氧化膜已不再是单一的Fe_3O_4膜,而是在Fe_3O_4膜与α—Fe基体之间出现的厚度不均匀的低价氧化铁(FeO)层。FeO的出现将降低载体铁粉的性能和使用寿命。
The oxide film of iron powder used in electrophotographic copier was analyzed microscopically and studied by metallography, X-ray, scanning electron microscopy and Auger spectroscopy (AGUER). The results show that when the oxygen content of iron powder is about 2%, the thickness of Fe_3O_4 film formed on the surface of the particles is about 2μm: when the oxygen content exceeds 5%, the oxide film of some particles in the iron powder is significantly Thick, even up to 5-8μm, this thick oxide film is no longer a single Fe_3O_4 film, but in the Fe_3O_4 film and α-Fe matrix between the uneven thickness of iron oxide (FeO) Floor. The appearance of FeO will reduce the performance and service life of the carrier iron powder.