Research On Simulation And Experiment Of Infinite Micro-heat Source Method For β-SiC Powder Synthesis

β-SiC powder has been widely used in electronics, information, precision machining, military, aerospace and other fields for its excellent high temperature resistance ,oxidation resistance, thermal stability, and its high hardness, small thermal expansion coefficient, large thermal conductivity, chemical corrosion resistance and good electrical properties.However, many methods ofβ-SiC powder synthesis exist these problem such as complex process, low purity product and difficult to produce in mass.This paper proposes a new technology which is suitable for industrial production ofβ-SiC powder--infinite- mini-heat source method, which uses quartz sand, anthracite and graphite as the raw materials to prepareβ-SiC powder under the infinite- mini-heat resistance furnace to achieve electrothermal reduction. The main features of the method are: simple process, low cost, high purity product,small size and easy to achieve large-scale production.the research on the amplification experiment which did the experimental study to determine the process parameters in the 25kw furnace by infinite- mini-heat source method to synthesisβ-SiC powder based on the small pilot experiment has been done in this paper.The result show that a single furnace can synthesis 65kgβ-SiC powder first grade product stably when the supply power is 45kw,the supply time is 55h,and the power supply system is using the big power first ,then the holding power.This paper used ANSYS software to simulate the temperature field based on the small power amplifying experiment's parameters ,the simulation results that the power supply is 75kw and the supply time is 85h indicate that the simulation has a great significance to amplify the experiment scale to synthesisβ-SiC powder by infinite- mini-heat source method and produce .In the ideal situation,the more heating sources,the better temperature distributionand the better reaction.The 130kgβ-SiC powder first grade product can be synthesized by designing and building a big power amplified furnace using the optimal process parameters.Used XRD, SEM ,laser particle size analysis and other testing tools to analyse the performance of the synthetic products ,the results showed that: the first-grade products ratio ofβ-SiC powder can reach 57% by this method ,the crystal forms completely,most of them are cubic system,the purity can reach 98.6%,and the particle size range can be reduced to 0 ~ 2μm.