Effect of B₄C on ignition and combustion of boron particles

The influence of different content B₄C on the ignition and combustion characteristics of boron particles was studied by TG-DTG and laser ignition experiments and software simulation of FactSage. The results indicate that B₄C can promote the rate of weight gain and lower the initial oxidation temperature of the sample below the temperature of 1000 K. As the content of B₄C in the sample increases, the rate of weight gain decreases within the temperature of 1000~1250 K, the weight gain ratio decreases and the temperature corresponding to maximum rate of weight gain declines at the temperature of 1250 K. The rate of weight gain increases again within the temperature of 1250~1700 K, and the rate becomes faster with more B₄C, the weight gain ratio of the sample with 10% B₄C contained exceeds that of the pure B finally. As the content of B₄C in the sample increases, the intensity of combustion spectrum becomes weaker and the highest of spectrum peak value reduces rapidly, the ignition delay time becomes longer and the combustion time becomes shorter. The results indicate that the B₄C is unfavorable for rapid ignition and heat release of the sample.