自蔓延高温技术制备ZrC粉体(英文)

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。

PREPARATION OF ZrC BY SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS

Zirconium carbide (ZrC) powder was prepared by self-propagating high-temperature synthesis (SHS) based on the reaction between zirconium and carbon. The effects of process parameters on the ignition current and combustion temperature during SHS process were investigated. Three carbon sources were selected including activated carbon, carbon black and graphite powders as carbon sources, and the influences on the microscope and chemical composition of final products were studied. Different amount of NaCl as SHS diluents was added to control the particle size and shape of the synthesized powder. The results show that the carbon black is the best carbon source for ZrC powder preparation. The mean particle size of the product synthesized from zirconium and carbon black is 0.5-1 μm and the oxygen content is 0.38%. The combustion temperature for the reaction between zirconium and carbon black decreases to 1 810 K with 30% in mass NaCl addition. With the increase of NaCl, the particle size of powder decreases, and its mean particle size is about 50 nm when NaCl content is 30%.