β-SiC因其高硬度、耐磨削、耐腐蚀、高热导率、高电子迁移率、抗氧化等诸多优点而被普遍应用于机械、石油化工、电子电器、航空航天等领域。目前有很多种方法能制备出β-SiC粉体，但是批量化制备难度大，而且存在粉体粒径小、密度小、自形度差等问题，严重限制了其在许多领域的应用。 本文以碳质、硅质材料为原料，在真空条件下采用多热源法通过小试和中试对比试验制备出了高纯度高密度大粒径的β-SiC粉体。小试试验主要研究了混料时间、真空、碳质原料粒径、保温功率以及合成时间对β-SiC粉体的影响，通过X射线衍射仪（XRD）、扫描电镜（SEM）、化学成分、密度、粒度等测试对制备的产物进行了相关分析与表征，获取了最佳制备工艺参数，并进行了中试验证试验。 小试结果表明，混料时间为4 h，真空度为20~100 Pa，碳质原料粒径为300 μm，保温功率为5000 W，合成时间为8 h时，合成的β-SiC粉体的综合性能最佳。纯度为99.42%，颗粒的自形程度较好，粒径约为55 μm，平均粒径相同时β-SiC的振实密度（1.674 g/cm3）较常压下制备产物的振实密度（1.427 g/cm3）提高了17.19%。中试结果表明，当保温功率为35 kW时，β-SiC粉体的纯度为99.07%，颗粒的自形程度很好，平均粒径为28.2 μm，振实密度为1.536 g/cm3，振实密度高于常压下制备产物的振实密度，但低于小试产物的振实密度。

Due to its high hardness, wear resistance, corrosion resistance, high thermal conductivity, high electron mobility, and oxidation resistance, β-SiC is widely used in machinery, petrochemical, electronic and electrical, aerospace and other fields . At present, there are many methods for preparing β-SiC powder, but the batch preparation is difficult, which also have problems such as small powder particle size, low density, and poor self-shape, which severely limits its application in many fields. In this paper, with carbonaceous and siliceous materials as raw materials high purity, high density and large particle size β-SiC powders were prepared under vacuum conditions by multi-heat-source method through small-scale experiment and pilot-scale experiment. In the small-scale experiments, the effects of mixing time, vacuum, carbonaceous material particle size, holding power and synthesis time on β-SiC powder were studied . The prepared products were analyzed and characterized by XRD, SEM, the composition, density and particle size. The optimal preparation parameters were obtained and pilot-scale experiments were carried out. The results of small-scale experiments showed that: β-SiC powder with optimal comprehensive properties was prepared when the mixing time was 4 h, the degree of vacuum was 20~100 Pa, the carbonaceous raw material particle size was 300 μm, the holding power was 5000 W, and the synthesis time was 8 h. And its purity is 99.42%, the self-shape of the particles was good, the size was 55 μm. With the same average particle size, the tap density of the products under vacuum was 1.674 g/cm3, which was 17.19% higher than the products prepared under normal pressure. The results of the pilot-scale experiment showed that: when the holding power was 35 kW, the purity of β-SiC powder was 99.07%, particles had a good degree of self-shape., the average particle size was 28.2 μm, the tap density was 1.536 g/cm3, which was higher than the tap density of the product prepared under normal pressure, but lower than the tap density of the small-scale product.