Heat treating method of carbon-boron material

The invention relates to a boro-carbon composite material, in particular to a heat treatment method for the boro-carbon material. The material to be treated is roasted products, namely boro-carbon roughcast, and the formula of the boro-carbon roughcast comprises the following: the boro-carbon roughcast is prepared by taking ultrafine petroleum coke powder as a main composition, adding proper earthy graphite and proper boron carbide powder (B4C) into the ultrafine petroleum coke powder, and performing kneading, profiling, asphalt leaching for two times and roasting for three times according to specified technology. After the temperature is raised to be between 850 and 950 DEG C at the speed of between 250 and 300 DEG C per hour, the temperature is continuously raised to be between 1,250 and 1,350 DEG C at the speed of between 20 and 50 DEG C per hour; after the temperature is maintained for 1 to 3 hours, the boro-carbon roughcast is cooled to a temperature of less than 50 DEG C along with a furnace and then di