β-SiC微粉纯化试验研究

Research on Purification of β-SiC Micropowder

为避免碳化硅微粉中的杂质对其产品质量和性能产生较大影响,现对β-SiC原料中含量较多的几种杂质进行去除试验研究。通过静态煅烧和物理浮选结合法分离游离碳,采用酸碱处理法去除原料中含有的游离硅、二氧化硅、铁单质及其氧化物,借助化学分析法、激光粒度仪和扫面电镜对纯化后的碳化硅样品进行分析。通过考察反应温度,酸碱浓度以及加热时间等条件对其除杂效果的影响,最终得到β-SiC微粉最佳提纯工艺。

In order to avoid the influence of impurities in the silicon carbide micropowder on the quality and performance of the product,there was an experimental research about several impurities removed from the β-SiC raw material.The free carbon was separated by static calcination and physical flotation,and the free silicon,silicon dioxide,iron element and its oxide contained in the raw material were removed by acid-base treatment.The purified silicon carbide powder was analyzed by means of chemical analysis,laser particle size analyzer and scanning electron microscope.By investigating the effects of reaction temperature,acid-base concentration and heating time on the impurities,the optimal purification process ofβ-SiC micropowder was finally obtained.