中文摘要：

采用XRD和TG-DTA方法对CeO2-B4C-C体系的高温化学反应及相组成进行了研究。结果表明,650℃-910℃时,CeO2同B4C生成CeBO3、CeBC和B;1270℃-1309℃时,CeO2同B4C生成CeBO3、B和CeB4,以及Ce-BO3、CeBC和B4C生成CeB4;在以上两个温度区间内,碳的作用很小。1317℃-1370℃时,CeBO3、B4C和C生成CeB4和B;1371℃-1420℃时,CeO2、B4C和C生成CeB6和CO;在以上两个温度区间内,碳的作用显著。1460℃的高温下,CeB4和B进一步反应生成CeB6,此时CeB6相占主要地位,其生成率随反应时间延长而增加。

英文摘要：

The high temperature chemical reaction process and the phase composition in CeO2-B4C-C system were studied by means of XRD and TG-DTA.The results show that CeO2,B4C and C react into CeBO3,CeBC and B in 650℃～910℃;and in 1270℃～1309℃,CeO2 and B4C react into CeBO3,B and CeB4,at the same time,CeBO3,CeBC and B4C react into CeB4;and the action of carbon is minor in the above temperature range;CeBO3,B4C and C react into CeB4 and B in 1317℃～1370℃;CeO2,B4C and C react into CeB6 and CO in 1371℃～1420℃;and the action of carbon is obvious in above temperature range.CeB4 and B further react into CeB6 at the temperature of 1460℃,and the content of CeB6 increases with the prolonging time.