高纯超细钨和碳化钨粉体的制备（英文）
发布时间：2021-07-23 11:40
提出一种两步法制备高纯度W或WC粉体的工艺,该工艺包括碳热预还原WO2.9,以及后续的对还原产物进行H2还原或CH4+H2混合气体碳化。研究C/WO2.9摩尔比和反应温度对不同阶段产物的相组成、形貌、粒径及杂质含量的影响。结果表明,当C/WO2.9摩尔比为2.1:1-2.5:1时,碳热预还原产物的物相由W和少量WO2组成。随着C/WO2.9摩尔比从2.1:1增加到2.5:1,碳热预还原产物的粒径逐渐减小。因此,采用相对较高的C/WO2.9摩尔比和较低的反应温度有利于获得超细W或WC粉体。经过第二阶段的反应,可以制备高纯度W粉和WC粉。
【文章来源】：Transactions of Nonferrous Metals Society of China. 2020,30(06)EISCICSCD
【文章页数】：10 页
【文章目录】：
1 Introduction
2 Experimental
3 Results and discussion
3.1 Carbothermic pre-reduction process
3.1.1 Non-isothermal experiments
3.1.2 Phase transition and microstructure evolution
3.2 Preparation of W powder by deep reduction with H2
3.3 Preparation of WC by further carburization with CH4-H2 mixed gases
3.4 Preparation of W and WC by direct reaction between WO2.9 and H2 or 10%CH4+90%H2mixed gases
4 Conclusions
【参考文献】：
期刊论文
[1]气流粉碎对超细WC粉体微观应变行为及团粒破碎行为的影响（英文）[J]. 孙亚丽,刘清才,黄新,张发兴,杨剑,梅华. Transactions of Nonferrous Metals Society of China. 2019(10)
本文编号：3299225
【文章来源】：Transactions of Nonferrous Metals Society of China. 2020,30(06)EISCICSCD
【文章页数】：10 页
【文章目录】：
1 Introduction
2 Experimental
3 Results and discussion
3.1 Carbothermic pre-reduction process
3.1.1 Non-isothermal experiments
3.1.2 Phase transition and microstructure evolution
3.2 Preparation of W powder by deep reduction with H2
3.3 Preparation of WC by further carburization with CH4-H2 mixed gases
3.4 Preparation of W and WC by direct reaction between WO2.9 and H2 or 10%CH4+90%H2mixed gases
4 Conclusions
【参考文献】：
期刊论文
[1]气流粉碎对超细WC粉体微观应变行为及团粒破碎行为的影响（英文）[J]. 孙亚丽,刘清才,黄新,张发兴,杨剑,梅华. Transactions of Nonferrous Metals Society of China. 2019(10)
本文编号：3299225
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