氮化锰的微波合成

Microwave synthesis of manganese nitride

以74μm锰粉为原料,在氢气和氮气的混合气、750℃以及保温2 h的条件下于微波反应器中合成氮含量为7.75%(质量分数)的氮化锰。研究了粉末粒度、合成温度、合成保温时间及合成气氛对合成产物氮含量的影响。结果表明:氮化气氛需要氢气和氮气的混合气体,氮化气氛中少量的氢促进了原料氮化和除去杂质氧。微波高温合成技术的合成温度和合成时间较传统工艺具有明显的优势。

The nitro-manganese with nitrogen content up to 7.75% was synthesed using 74 μm manganese powder as materials under condition of H2 and N2 mixture atmosphere, 750℃ and holding time 2 h in microwave applicator. The effects of particle size, synthesis temperature, holding time and reaction atmosphere were studied. The results show that the nitration atmosphere is mixture of N2 （95%） and H2 （5%）. The small amounts of hydrogen in the nitrification atmosphere accelerates the nitrification of materials and purifies the oxygen impurities. The microwave synthesis is superior to conventional nitration in peak temperature and holding time.