在还原过程中钒对纳米钨粉颗粒长大的抑制作用

EFFECT OF VANADIUM ON PARTICLE GROWTH OF TUNGSTEN NANOPOWDER DURING REDUCTION

采用V(NO3)5为抑制剂,分别加入到溶胶凝胶前的钨酸铵溶液中及溶胶反应后的凝胶体中,制备含V前躯体粉,并经两阶段低温还原法制备纳米W粉。运用XRD表征了纳米W粉的物相组成、相的变化,运用FESEM、定量金相以及SAXS表征了纳米W粉的颗粒形貌及颗粒粒度。并初步探讨了以V(NO3)5为抑制剂对纳米W粉在还原阶段及加热保温阶段长大的抑制效果。结果表明,V(NO3)5作为抑制剂的加入可有效抑制纳米W粉在还原阶段及加热保温阶段的长大。

The precursor powders containing vanadium were prepared by sol-gel method, adding V （NO3）5 solution as inhibitor into ammonium tungstate solution as the reactant of sol-gel and the gel. Subsequently, the precursors were reduced into tungsten nanopowder by two-step reduction. The phase composition and transformation were characterized by XRD,The particle size and particle pattern were characterized by FESEM, quantitative metallography and SAXS. The effect of the inhibitor on tungsten nanopowder was investigated, and the mechanism of inhibiting grain growth is dis- cussed. V（NO3 ）5 as a inhibitor effectively inhibits the grain growth of tungsten nanopowder during reduction.