本文關鍵詞： 超細WC-Co復合粉末 噴霧轉化法 有機碳 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、有機碳源或炭黑經噴霧干燥后的前驅體粉末為原料,在N2氣氛中進行原位還原碳化,制備超細WC-Co復合粉末。采用DSC研究還原碳化過程中的相變過程,并用XRD分析不同工藝下復合粉末的物相組成,利用SEM分析復合粉末經磷酸浸蝕前后的微觀形貌,結合納米測量軟件測量浸蝕前后晶粒粒度分布。結果表明:2種碳源的粉末在低于900℃的溫度下可發(fā)生還原反應,以有機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,炭黑為碳源的復合粉末所需要的碳化時間長,制備得到的晶粒大,WC的晶粒度為0.29μm,WC-Co復合粉末二次顆粒是由金屬鈷粘結細小的碳化鎢晶粒而成。有機碳制備的晶粒細小并且較均勻,WC的晶粒度為0.16μm,碳化鎢晶粒間會形成燒結頸,經過磷酸浸蝕后,其燒結頸結構不會破壞。
[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