以炭黑和硼酸为原料,通过碳热还原法合成了部分石墨化的C/B_4C复合粉体.考察了加热温度和硼酸添加量对C/B_4C复合粉体合成过程的影响,采用X射线衍射和扫描电镜等方法对C/B_4C复合粉体的物相及形貌进行了分析,利用热重法研究了C/B_4C复合粉体的氧化性能.研究结果表明,随着加热温度的升高,复合粉体的石墨化度增大,B_4C含量下降;随着硼酸加入量的增大,复合粉体中B_4C含量及其石墨化度均增大;当炭黑和硼酸加入量分别为33.21%和66.79%时,经1900℃热处理所得复合粉体的石墨化度达23.26%,B_4C含量为20.63%;与工业用B_4C和炭黑的混合物相比,实验室合成的C/B4C复合粉体具有较好的抗氧化性能.
The partly graphitized C/B_4C composite powder is prepared from carbon black and boric acid by carbothermal reduction reaction,the effects of heating temperature and addition amount of boric acid are investigated,the phase composition and microstructure of the C/B_4C composite powder are analyzed by X-ray diffraction and scanning electron microscope,respectively,and the oxidation behavior is studied by TG method.The results show that the graphitization degree of the synthesized composite powder rises,while B_4C phase decreases with increasing of heating temperature.The B_4C content and graphitization degree of synthesized composite powder increase with increasing addition amount of boric acid.The graphitization degree of the composite powder synthesized at 1900℃ is 23.26%,the percentage of B_4C is about 20.63% as raw materials are 33.21% carbon black and 66.79% boric acid.Compared with the mixture of industrial B_4C and carbon black,the synthesized C/B4C composite powder shows better oxidation resistance.
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