电火花-超声复合加工法制备镍微球时非电工艺参数对镍微球尺寸的影响规律

发布时间：2018-06-06 06:39

本文选题：电火花-超声复合加工 + 镍微球　；参考：《机械工程学报》2015年11期

【摘要】：火花放电法制备镍微球是一种新兴的方法。为了减小微球尺寸,提出一种复合型制备方法——电火花-超声复合加工法。通过改变超声参数(频率和功率)和工作液(煤油和纯水),分析这两种工艺参数对微球尺寸的影响。使用扫描电镜观察试验样本,X射线衍射分析样本成分,Smile View软件测量微球粒径,Origin Pro软件得到粒径分布百分比。结果表明:加入超声波之后,小粒径(0~10μm)镍微球比例明显升高,且小粒径微球比例随着超声波频率的增大而降低,随着超声波功率的增大而升高。和煤油相比,以纯水为工作液所制备的微球尺寸普遍偏小,可得到粒径小于1μm比例为6%~10%,小于5μm比例为50%~80%,且超声波对微球尺寸减小效果比在煤油中显著。以纯水为工作液所得微球成分中Ni单质比例更高(?99%)。此外,在加入超声试验组中发现有少量空心球存在,并初步分析了空心球成型机理。
[Abstract]:The preparation of nickel microspheres by spark discharge is a new method. In order to reduce the size of microspheres, a composite preparation method-EDM-ultrasonic composite machining method was proposed. The influence of ultrasonic parameters (frequency and power) and working liquid (kerosene and pure water) on the size of microspheres was analyzed. Scanning electron microscopy (SEM) was used to analyze the composition of the sample by X-ray diffraction (XRD). The particle size distribution was obtained by Pro software, which was used to measure the particle size of the microspheres. The results show that the proportion of small particle size (10 渭 m) nickel microspheres increases obviously with the addition of ultrasonic wave, and the ratio of small particle size microspheres decreases with the increase of ultrasonic frequency and increases with the increase of ultrasonic power. Compared with kerosene, the size of the microspheres prepared by using pure water as working fluid is generally smaller than that of kerosene. The results show that the particle size is less than 1 渭 m (6 渭 m) and less than 5 渭 m (50 / 80). The effect of ultrasonic on the reduction of microsphere size is more obvious than that in kerosene. The ratio of Ni to Ni in the microspheres obtained from pure water is higher than that of pure water. In addition, a small number of hollow spheres were found in the ultrasonic test group, and the forming mechanism of the hollow spheres was preliminarily analyzed.
【作者单位】：四川大学制造科学与工程学院;
【基金】：国家自然科学基金(51275324,51175357,51175355) 教育部新世纪优秀人才计划(NCET-12-0385)资助项目
【分类号】：TG66

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