ZrVMnCe-Zr吸气材料的注射成形制备工艺与性能研究

发布时间：2018-01-28 10:57

  本文关键词： 吸气材料 粉末注射成形 吸气性能 激活工艺　出处：《北京有色金属研究总院》2017年硕士论文　论文类型：学位论文

【摘要】：ZrVMnCe合金是本课题组近些年新开发的一种具有激活温度低、吸气量大等优点的吸气材料,但ZrVMnCe粉体的烧结性能相对较差,制备的烧结材料强度不理想。本文研究通过制备ZrVMnCe-Zr复合材料,以期获得机械性能和吸气性能兼具的综合性能。同时,考虑到浆料涂敷或粉浆浇注等传统的吸气剂制备技术在产品一致性差、批量化难度大等方面的不足,本研究工作采用了金属粉末注射成形工艺制备ZrVMnCe-Zr吸气剂元件,利用SEM、比表面积和孔径测试仪和压汞仪、吸气测试装置等设备测试了吸气材料微观形貌、比表面积、孔隙率、材料的吸气性能,研究了化学脱脂、ZrVMnCe粉体粒度和不同配比(ZrVMnCe与Zr)、烧结、激活条件等四个关键工艺环节并优化了相关参数。具体研究工作和主要结论如下:(1)研究了装载量、脱脂温度和脱脂时间对复合材料注射坯体化学脱脂效果的影响。研究结果表明,随着装载量、脱脂温度的升高和脱脂时间的增加,注射坯体的脱脂率也增大。以三氯乙烯为脱脂溶剂,经60℃×6h化学脱脂处理后,装载量为60%的吸气材料样品的脱脂率相对最高,达到70.2%。(2)研究了 ZrVMnCe粉体粒度、ZrVMnCe与Zr质量配比对复合材料微观形貌和吸气性能的影响。研究结果表明,随着ZrVMnCe粒度的增大吸气样品的吸气性能呈现出先升高后下降的变化趋势。100-200目ZrVMnCe粉末所制备的吸气样品的孔隙率和比表面积相对最高,吸气性能也相对最佳。而随着Zr组元比例的增加,材料的吸气性能呈现出逐渐降低的趋势。ZrVMnCe与Zr的质量比为6:4所制备的吸气剂样品的机械强度和吸气性能达到相对比较理想的状态。(3)研究了烧结温度和烧结保温时间对ZrVMnCe-Zr吸气材料烧结特性和吸气性能的影响。研究结果表明,ZrVMnCe-Zr吸气材料的烧结致密化效果对烧结温度和烧结保温时间十分敏感。在920℃至1060℃的烧结温度范围内,随着烧结温度的升高,吸气材料的孔隙率和比表面积逐渐降低,致密性增加。保温时间的延长同样会明显促进材料的烧结致密化。烧结温度为1020℃、保温时间为20min时,ZrVMnCe-Zr烧结材料的机械强度和吸气性能达到相对理想的综合水平。(4)研究了不同激活条件下(激活温度和激活保温时间)吸气材料的吸气性能。研究结果表明,随着激活温度的升高,材料的吸气性能也明显提高。在500℃激活时,材料已经可以达到较好的活化状态,在此温度下延长激活保温时间可大幅提高材料的室温吸氢性能,ZrVMnCe粒度为100-200目、ZrVMnCe:Zr=6:4所制备的吸气材料经500℃保温10min激活后的第十分钟的室温吸氢速率为2323.8cm3.s-1·g-1,经500℃保温80min激活后第十分钟的室温吸氢速率可以达到7521.9cm3·s-1·g-1。
[Abstract]:ZrVMnCe alloy is a newly developed getter material with the advantages of low activation temperature and large inspiratory capacity in recent years, but the sintering properties of ZrVMnCe powder are relatively poor. The strength of the sintered material is not ideal. In order to obtain the comprehensive properties of both mechanical properties and inspiratory properties, this paper studies the preparation of ZrVMnCe-Zr composites. Considering the shortcomings of the traditional getter preparation technology such as slurry coating or slurry pouring in the aspects of poor product consistency and large difficulty in batch. In this study, the metal powder injection molding process was used to prepare the ZrVMnCe-Zr getter element, using SEM, specific surface area and pore size tester and mercury porosimeter. The micro morphology, specific surface area, porosity and inspiratory properties of the aspirated materials were tested by means of an inspiratory test device, and chemical degreasing was studied. ZrVMnCe powders were sintered with ZrVMnCe and ZrVMnCe in different proportions. The activation conditions are four key process links and the relevant parameters are optimized. The specific research work and main conclusions are as follows: 1) the loading capacity is studied. The effect of degreasing temperature and time on the chemical degreasing of the composite injection billet. The results show that with the increase of the loading amount, the degreasing temperature and the degreasing time increase. The degreasing rate of injection billet was also increased. When trichloroethylene was used as degreasing solvent, after 60 鈩，

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