反应温度和添加剂含量对微波合成碳化硼微观形貌的影响
发布时间：2018-09-01 16:49
【摘要】：微波烧结由于具有高效、快速、绿色等特点越来越受到人们的关注。本文以天然煤粉(C)和硼酸(H3BO3)为原料,在无气氛保护条件下,利用2.45 GHz的TE666单频微波烧结炉,快速碳热还原反应法制备出纳米碳化硼(B_4C)粉体。结果发现:当煤粉(C)和硼酸(H3BO3)质量比为3∶1,微波烧结温度为1400~1800℃,保温时间为5min,即可制备出结晶良好的碳化硼(B_4C)晶体,调整相关工艺参数可以控制B_4C晶体的形貌,如直径为50~150nm的球形颗粒或碳化硼片状结构,通过改变Na_2CO_3添加剂含量(3wt%~9wt%),可得到不同尺寸的碳化硼纳米片(边长为200~800 nm),获得传统电阻烧结条件下无法得到的碳化硼(B_4C)晶体。
[Abstract]:Microwave sintering has attracted more and more attention because of its high efficiency, rapidity and green. In this paper, using natural coal powder (C) and boric acid (H3BO3) as raw materials, nanometer boron carbide (BSCC) powder was prepared by rapid carbothermal reduction reaction in a 2.45 GHz TE666 single-frequency microwave sintering furnace without atmosphere protection. The results show that when the mass ratio of pulverized coal (C) and boric acid (H3BO3) is 3: 1, the microwave sintering temperature is 1 400 鈩，
本文编号：2217789
[Abstract]:Microwave sintering has attracted more and more attention because of its high efficiency, rapidity and green. In this paper, using natural coal powder (C) and boric acid (H3BO3) as raw materials, nanometer boron carbide (BSCC) powder was prepared by rapid carbothermal reduction reaction in a 2.45 GHz TE666 single-frequency microwave sintering furnace without atmosphere protection. The results show that when the mass ratio of pulverized coal (C) and boric acid (H3BO3) is 3: 1, the microwave sintering temperature is 1 400 鈩，
本文编号：2217789
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