提出一種兩步法制備高純度W或WC粉體的工藝,該工藝包括碳熱預(yù)還原WO_2.9,以及后續(xù)的對還原產(chǎn)物進行H₂還原或CH₄+H₂混合氣體碳化。研究C/WO_2.9摩爾比和反應(yīng)溫度對不同階段產(chǎn)物的相組成、形貌、粒徑及雜質(zhì)含量的影響。結(jié)果表明,當(dāng)C/WO_2.9摩爾比為2.1:1-2.5:1時,碳熱預(yù)還原產(chǎn)物的物相由W和少量WO₂組成。隨著C/WO_2.9摩爾比從2.1:1增加到2.5:1,碳熱預(yù)還原產(chǎn)物的粒徑逐漸減小。因此,采用相對較高的C/WO_2.9摩爾比和較低的反應(yīng)溫度有利于獲得超細W或WC粉體。經(jīng)過第二階段的反應(yīng),可以制備高純度W粉和WC粉。 

【文章來源】：Transactions of Nonferrous Metals Society of China. 2020,30(06)EISCICSCD

【文章頁數(shù)】：10 頁

【文章目錄】：
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


【參考文獻】：
期刊論文
[1]氣流粉碎對超細WC粉體微觀應(yīng)變行為及團粒破碎行為的影響（英文）[J]. 孫亞麗,劉清才,黃新,張發(fā)興,楊劍,梅華.  Transactions of Nonferrous Metals Society of China. 2019(10)



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