本文選題：碳?xì)鋮f(xié)同還原　切入點：納米碳化鎢　出處：《稀有金屬材料與工程》2017年01期 　論文類型：期刊論文

【摘要】：針對傳統(tǒng)還原-碳化工藝中WC粉顆粒長大的問題,采用碳?xì)鋮f(xié)同還原-碳化法制備納米級球形WC粉,研究了前驅(qū)體配碳比和反應(yīng)溫度對WC粉性能的影響。結(jié)果表明,WC粉的碳含量與前驅(qū)體的配碳比密切相關(guān),最佳配碳比(即n(C)/n(W)值)為3.6。W轉(zhuǎn)變?yōu)閃C具有結(jié)構(gòu)遺傳性,WC粉的平均粒徑與還原溫度和碳化溫度密切相關(guān)。隨著還原溫度由680℃升高至800℃,還原水蒸氣與碳反應(yīng)生成CO和H_2,顯著降低體系中水蒸氣的分壓,從而抑制中間產(chǎn)物W顆粒的揮發(fā)-沉積長大,WC粉的平均粒徑隨還原溫度升高而減小。碳化過程中的高溫促進(jìn)WC顆粒的晶界遷移和納米W顆粒之間的燒結(jié)合并長大,WC粉的平均粒徑隨碳化溫度的升高而增大。n(C)/n(W)為3.6的前驅(qū)體粉末經(jīng)800℃還原和1100℃碳化后,得到平均粒徑為87.3 nm的球形WC粉。
[Abstract]:Aiming at the problem of WC powder particle growing up in traditional reduction-carbonization process, nano-sized spherical WC powder was prepared by means of carbon-hydrogen synergistic reduction-carbonization method. The effects of precursor carbon ratio and reaction temperature on the properties of WC powder were studied. The results show that the carbon content of WC powder is closely related to the carbon ratio of the precursor. The average particle size of WC powder transformed into WC with structural heredity is closely related to the reduction temperature and carbonation temperature, with the reduction temperature rising from 680 鈩，

本文編號：1600309