钙蒸气对氢化脱氢钛粉还原脱氧行为的影响

发布时间：2018-03-30 03:02

本文选题：钙蒸气　切入点：钛粉　出处：《粉末冶金材料科学与工程》2017年05期

【摘要】：以金属钙在高温下生成的钙蒸气作为还原剂,对氧含量(质量分数,下同)为0.56%的氢化脱氢钛粉进行脱氧,然后分别用稀盐酸和蒸馏水充分洗涤,过滤干燥后得到脱氧钛粉。通过X射线衍射(XRD)、扫描电镜(SEM)、能谱分析(EDS)和氮氧含量分析等手段,分析与表征粉末的物相组成、形貌和元素组成,研究还原温度和时间对脱氧效果的影响,并对钛粉的脱氧行为进行研究。结果表明,钛粉脱氧主要通过还原反应和原子间的扩散进行。还原温度与还原时间对脱氧钛粉的氧含量影响较大。在相同条件下,随还原温度升高,钛粉的氧含量降低,但当温度超过1 273 K时氧含量略有增加;最佳还原工艺为1 273 K温度下保温2 h,钛粉氧含量从0.56%降至0.14%,粉末颗粒形貌和粒度未发生明显变化。脱氧钛粉在室温下于空气中放置60 d,其氧含量变化不大。
[Abstract]:The hydrogen dehydrogenated titanium powder with 0.56% oxygen content (mass fraction) was deoxidized by calcium vapor formed by metal calcium at high temperature, and then washed with dilute hydrochloric acid and distilled water respectively. After filtration and drying, deoxidized titanium powder was obtained. The phase composition, morphology and elemental composition of the powder were analyzed and characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), EDS and nitrogen and oxygen content analysis. The effect of reduction temperature and time on deoxidation effect and deoxidation behavior of titanium powder were studied. Deoxidation of titanium powder is mainly carried out by reduction reaction and diffusion between atoms. Reduction temperature and reduction time have great influence on the oxygen content of deoxidized titanium powder. Under the same conditions, the oxygen content of titanium powder decreases with the increase of reduction temperature. However, when the temperature was over 1 273 K, the oxygen content increased slightly. The optimum reduction process was that the oxygen content of titanium powder decreased from 0.56% to 0.14 at 1 273 K for 2 h, but the morphology and particle size of deoxytitanium powder did not change obviously, but the oxygen content of deoxytitanium powder kept in air for 60 days at room temperature had little change.
【作者单位】：中南大学粉末冶金研究院;
【基金】：国家自然科学基金资助项目(51474245,51571214) 湖南省科技计划资助项目(2015GK3004,2015JC3006) 国家重点研发计划资助项目(2016YFB1100101) 中南大学贵重仪器设备开放共享基金资助项目(CSUZC2015030)
【分类号】：TF123.23

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