Abstract This paper reports a simple route to synthesize nanocrystalline silicon carbide (SiC) ceramic powders via the direct reaction of silicon powders with carbon black in a temperature-programmed muffle furnace. The mixing powders of silicon and carbon black were loaded in a alumina crucible, and then the crucible was sealed with some materials to prevent oxidization. The effect of reaction temperature on the phase of the product powders was investigated. FESEM and TEM images showed that the SiC nanopowders were spherical and had an average particle size of 48.56 nm. The sintering activities of the SiC nanopowders and commercial SiC fine powders were also investigated by hot-pressing sintering. SiC nanoceramic sintered at 1850 °C exhibited a high relative density (up to 99.2%) and a high flexural strength of 580 MPa, which exhibits better sintering activity of synthesized SiC nanopowders.

中文翻译：

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纳米晶碳化硅陶瓷粉体的合成与烧结

摘要 本文报道了一种通过硅粉与炭黑在程序升温马弗炉中直接反应合成纳米晶碳化硅 (SiC) 陶瓷粉末的简单途径。将硅和炭黑的混合粉末装入氧化铝坩埚中，然后用一些材料密封坩埚以防止氧化。研究了反应温度对产物粉末相的影响。FESEM 和 TEM 图像显示 SiC 纳米粉末为球形，平均粒径为 48.56 nm。还通过热压烧结研究了 SiC 纳米粉末和商业 SiC 细粉的烧结活性。在 1850 °C 下烧结的 SiC 纳米陶瓷表现出较高的相对密度（高达 99.2%）和 580 MPa 的高弯曲强度，