焦炭粉末中添加0—10％(重量比,下同)的LaB_6,在压力200公斤/厘米~2、温度1400—2200℃条件下烧结,并就焦炭粉末的加压烧结作用进行了研究。结果,通过2000℃以上的加压烧结获得了致密的烧结体。另外还表明,所得焦炭的X射线衍射数据特别是d(002)值随LaB_6添加量的增加而减少,在2—4％时出现最小值,超过此量反而增大。出现最小值的添加量随烧结温度升高相应减少。再进一步增加添加量,d(002)为定值约3.405埃,其006X射线衍 Coke powder was added 0-10% (weight ratio, the same below) LaB_6, at a pressure of 200 kg / cm ~ 2, temperature 1400-2200 ℃ sintering conditions, and the coke powder sintering was studied. As a result, a dense sintered body was obtained by pressure sintering at 2000 ° C or higher. In addition, the X-ray diffraction data of the obtained coke, especially the d (002) value, decreased with the increase of the amount of LaB_6, and the minimum appeared at 2-4%. The minimum amount of addition appears to decrease as the sintering temperature increases. Further increase the amount of addition, d (002) is about 3.405 angstroms, the 006X ray diffraction