氢化钛粉颗粒的粉碎及机理研究

本文采用闭环气流磨系统对氢化后得到的粗颗粒氢化钛粉进行粉碎,利用扫描电子显微镜和粒度分析技术对结果进行表征,并对闭环气流磨的粉碎机理进行了讨论。结果表明,对粗颗粒氢化钛粉进行闭环气流磨粉碎,克服了氢化脱氢法(hydrogenation dehydrogenation,HDH)制备的钛粉存在的粒度不均匀、粒度分布较宽等品质问题;其粉碎机理可总结为,经多股高速高压氩气流冲击、打磨,粉末颗粒自身相互碰撞、摩擦,以及粉末颗粒与磨料腔腔壁、分级轮的碰撞,粗颗粒氢化钛粉从大颗粒粉碎成细小颗粒。

Grinding and mechanism of titanium hydride powder

Titanium hydride powder (TiH2) was grinded by closed loop jet mill system, the morphology and grain size distribution of particles were investigated by scanning electron microscopy (SEM) and laser-diffraction diameter tester, and the related grinding mechanism was discussed. In the results, the quality problems of titanium powder caused by hydrogenation dehydrogenation (HDH), such as the non-uniform and wider distribution of particle size, are solved by grinding using closed loop jet mill system. The grinding mechanism of titanium hydride powder from the larger particles into fine particles is summarized as the impacting and grinding by high pressure argon flow, the collision and friction by powder particles themselves, and the collision by the inner wall of grinding cavity and classifier wheel.