熔盐氮化法合成氮化锆粉体及其对硅粉氮化的影响

Synthesis of zirconium nitride powders via molten-salt nitridation and their effect on nitriding of silicon powder

为寻求一种简单、安全、成本低、产率高的合成ZrN的方法,以ZrO 2和Mg粉为主要原料,在熔盐介质中氮化合成ZrN粉体。研究了熔盐介质(MgCl 2和MgCl 2-NaCl)、氮化温度(1000和1100℃)对产物物相和显微形貌的影响,并研究了合成的ZrN对硅粉氮化的影响。结果表明:熔盐介质MgCl 2与NaCl物质的量比为1∶2时,合成了纯相的ZrN;温度的升高有利于提高ZrN晶体的结晶度;与直接氮化硅粉相比,ZrN的添加可显著促进α-Si 3N 4晶须的生成。

In order to find a simple,safe,low-cost,and high-yield method for synthesizing ZrN powders,ZrN powders were synthesized in a molten-salt medium using ZrO2 and Mg powder as the main raw materials.The effects of the molten-salt medium(MgCl2 and MgCl 2-NaCl)and the nitriding temperature(1000 and 1100℃)on the phase composition and micromorphology of the product were investigated.The effect of the synthesized ZrN on the nitridation of silicon powder was studied.The results show that when the molar ratio of MgCl2 to NaCl is 1∶2,pure ZrN is formed;the increase of the temperature is beneficial to improving the crystallinity of ZrN crystals;compared with direct nitridation of silicon powder,the addition of ZrN can significantly promote the formation ofα-Si 3N 4 whiskers.