本文關(guān)鍵詞： 超細(xì)WC-Co復(fù)合粉末 噴霧轉(zhuǎn)化法 有機(jī)碳 炭黑 原位還原碳化 酸浸蝕　出處：《功能材料》2017年11期 　論文類型：期刊論文

【摘要】：以偏鎢酸銨、醋酸鈷、有機(jī)碳源或炭黑經(jīng)噴霧干燥后的前驅(qū)體粉末為原料,在N2氣氛中進(jìn)行原位還原碳化,制備超細(xì)WC-Co復(fù)合粉末。采用DSC研究還原碳化過程中的相變過程,并用XRD分析不同工藝下復(fù)合粉末的物相組成,利用SEM分析復(fù)合粉末經(jīng)磷酸浸蝕前后的微觀形貌,結(jié)合納米測量軟件測量浸蝕前后晶粒粒度分布。結(jié)果表明:2種碳源的粉末在低于900℃的溫度下可發(fā)生還原反應(yīng),以有機(jī)碳為碳源的粉末較炭黑的還原溫度低。在950℃的碳化溫度條件下,炭黑為碳源的復(fù)合粉末所需要的碳化時(shí)間長,制備得到的晶粒大,WC的晶粒度為0.29μm,WC-Co復(fù)合粉末二次顆粒是由金屬鈷粘結(jié)細(xì)小的碳化鎢晶粒而成。有機(jī)碳制備的晶粒細(xì)小并且較均勻,WC的晶粒度為0.16μm,碳化鎢晶粒間會形成燒結(jié)頸,經(jīng)過磷酸浸蝕后,其燒結(jié)頸結(jié)構(gòu)不會破壞。
[Abstract]:Ultrafine WC-Co composite powder was prepared by in-situ reduction and carbonization of ammonium metatungstate, cobalt acetate, organic carbon source or carbon black after spray drying in N _ 2 atmosphere. The phase transition in the process of reduction and carbonization was studied by DSC. The phase composition of the composite powder was analyzed by XRD, and the microstructure of the composite powder was analyzed by SEM before and after etching with phosphoric acid. The grain size distribution before and after etching was measured with nano-measurement software. The results showed that the powder of two kinds of carbon sources could be reduced at a temperature below 900 鈩，

本文編號：1500190