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采用自蔓延高温合成(self-propagating high-temperature synthesis,SHS)技术,以 Zr+C 为反应体系合成了 ZrC 粉末。研究了实验参数对 SHS过程中点火电流、燃烧温度的影响。采用了 3 种碳源,研究了其对最终产物形貌及化学组成的影响。通过添加不同含量的 NaCl 作为 SHS 稀释剂,控制产物粒径及形貌。结果表明:炭黑是高温自蔓延法制备 ZrC 粉体的最佳碳源。由该体系制备的 ZrC 粉末粒径在 0.5～1 μm之间,氧含量为 0.38%。随稀释剂 NaCl 含量增加,体系燃烧温度降低,产物粒径减小。当 NaCl 含量为 30% (质量分数)时,体系燃烧温度下降至 1 810 K,产物 ZrC 粉末的粒径减小至 50 nm。
The ZrC powder was synthesized by self-propagating high-temperature synthesis (SHS) with Zr + C as the reaction system. The influence of experimental parameters on ignition current and combustion temperature in SHS process was studied. Three kinds of carbon sources were used to study their effects on the morphology and chemical composition of the final product. The particle size and morphology of the product were controlled by adding different amounts of NaCl as the SHS diluent. The results show that carbon black is the best carbon source for ZrC powder prepared by high temperature self - propagating method. The ZrC powder prepared by the system has a particle size of 0.5-1 μm and an oxygen content of 0.38%. With the increase of diluent NaCl content, the combustion temperature of the system decreased and the product particle size decreased. When the NaCl content is 30% (mass fraction), the combustion temperature of the system drops to 1 810 K and the particle size of the product ZrC powder decreases to 50 nm.