In order to immobilize high-level radioactive graphite, silicon carbide based composite materials{ (1-x) SiC· x MgAl₂O₄ (0.1 ≤ x≤0.4) } were fabricated by solid-state reaction at 1370 °C for 2 h in vacuum. Residual graphite and precipitated corundum were observed in the as-synthesized product, which attributed to the interface reaction of element silicon and magnesium compounds. To further understand the reasons for the presence of graphite and corundum, the effects of mole ratio of Si/C, MgAl₂O₄ content and non-stoichiometry of MgAl₂O₄ on the synthesis were investigated. To immobilize graphite better, residual graphite should be eliminated. The target product was obtained when the mole ratio of Si/C was 1.3:1, MgAl₂O₄ content was x = 0.2, and the mole ratio of Al to Mg in non-stoichiometric MgAl₂O₄ was 1.7:1. In addition, the interface reaction between magnesium compounds and silicon not graphite was displayed by conducting a series of comparative experiments. The key factor for the occurrence of interface reaction is that oxygen atom is transferred from magnesium compound to SiO gas. Infrared and Raman spectrum revealed the increased disorders of graphite after being synthesized.

为了固定高放射性石墨，碳化硅系复合材料{（1- X）的SiC· X的MgAl ₂ ö ₄（0.1≤  X ≤0.4）}通过固相反应在1370℃下2小时制成在真空中。在合成后的产物中观察到残留的石墨和刚玉沉淀，这归因于元素硅和镁化合物的界面反应。为了进一步理解对石墨和刚玉，硅/ C的摩尔比的影响的存在的理由，镁铝₂ ö ₄的MgAl的内容和非化学计量₂ ö ₄对合成进行了研究。为了更好地固定石墨，应消除残留的石墨。当Si / C的摩尔比为1.3：1，MgAl ₂ O _4的含量为x  = 0.2，并且非化学计量的MgAl ₂ O ₄中的Al与Mg的摩尔比为1.7：1时，获得目标产物。此外，通过进行一系列比较实验，显示了镁化合物与硅而不是石墨之间的界面反应。发生界面反应的关键因素是氧原子从镁化合物转移到SiO气体中。红外和拉曼光谱显示出合成后石墨的无序性增加。