發(fā)布時(shí)間：2018-03-28 16:24

  本文選題：納米W粉　切入點(diǎn)：碳輔助氫還原　出處：《中國(guó)有色金屬學(xué)報(bào)》2016年05期

【摘要】：以偏鎢酸銨和葡萄糖為原料,采用碳輔助氫氣還原的方法制備出納米W粉,并研究W、C摩爾比和還原工藝對(duì)W粉的平均粒度和殘?zhí)剂康挠绊憽＝Y(jié)果表明:還原產(chǎn)物、W粉的平均粒度和殘C量與還原溫度和W、C摩爾比密切相關(guān),而當(dāng)還原時(shí)間超過(guò)1 h后,還原時(shí)間對(duì)W粉的平均粒度和殘C量沒(méi)有明顯的影響。還原產(chǎn)物決定于還原溫度,W、C摩爾比為1:2.6的前驅(qū)體在700、750、800℃還原以后得到的產(chǎn)物分別為W+WO_2、W+W_2C+WC和W。W粉的粒度隨著W、C摩爾比由1:2.0增加到1:3.0而由98 nm減小到42 nm,但W粉的殘C量在W、C摩爾比小于1:2.6時(shí)都在0.05%(質(zhì)量分?jǐn)?shù))以下,W、C摩爾比繼續(xù)增加時(shí),W粉的殘C量顯著增加。W、C摩爾比為1:2.6的原料經(jīng)800℃還原1 h后得到無(wú)明顯團(tuán)聚的W粉,其平均粒度為46 nm,殘C量為0.05%(質(zhì)量分?jǐn)?shù))。
[Abstract]:Using ammonium metatungstate and glucose as raw materials, nanocrystalline W powder was prepared by carbon-assisted hydrogen reduction. The effects of W / C molar ratio and reduction process on the average particle size and residual carbon content of W powder were studied. The results showed that the average particle size and residual C content of W powder were closely related to the reduction temperature and the molar ratio of W / C, and when the reduction time was more than 1 h, the reduction time was more than 1 h. The reduction time has no significant effect on the average particle size and residual C content of W powder. The reduction product is determined by the particle size of W WO 2W W 2C WC and W W W 2C WC after reduction at 700750800 鈩，

本文編號(hào)：1677107