配碳量与碳化温度对(W,Mo)C粉末成分与结构的影响  

Effect of Carbon Content and Carbonization Temperature on the Composition and Structure of(W,Mo)C Powder

作　　者：时凯华[1] 昝秀颀 廖军[1] 舒军 SHI Kaihua;ZAN Xiuqi;LIAO Jun;SHU Jun(Zigong Cemented Carbide Corp.,Ltd.,Renmin Road 111,Zigong 643011,Sichuan,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]自贡硬质合金有限责任公司,四川自贡643011 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中国钨业》2021年第2期53-59,共7页China Tungsten Industry

摘　　要：以WO3、MoO3粉末为原料,通过共还原方法得到W/Mo金属混合粉,采用不同配碳量和碳化温度碳化制备得到w(Mo)为10%的(W,Mo)C粉末。利用XRD、SEM及TEM等方法分析观察了不同碳化工艺参数对粉末碳化后的物相组成及微观结构的影响,并通过对比WC的相关参数对碳化结果进行了判定。结果表明:采用共还原碳化法,可以成功制备获得物相组成主要为(W,Mo)C的粉末。当配碳量(W/Mo∶C)大于1∶1.0、碳化温度高于1 700℃时,配碳量和碳化温度对(W,Mo)C粉末物相组成影响并不明显,但对于粉末的微观结构及成分有着明显影响。配碳量为1∶1.0和1∶1.1、碳化温度为1 700℃、1 900℃和2 250℃时,粉末的物相组成均主要为(W,Mo)C,没有其他相成分。当配碳量为1∶1.0时,不同碳化温度碳化后,(W,Mo)C粉末的表面均较为光滑,但粉末破碎难度逐渐增大;当配碳量为1∶1.1时,不同碳化温度碳化后,(W,Mo)C粉末的表面都出现了细小颗粒,经TEM和EDS观察分析,证实其主要成分为碳,说明此时配碳量偏高。With WO3 and MoO3 powders as raw materials,W/Mo metal mixed powder was obtained by co-reduction.And(W,Mo)C powder with 10%w(Mo)was prepared by carbonization with different carbon content and carbonization temperature.XRD,SEM,TEM and other methods were used to analyze and observe the influence of different carbonization process parameters on the phase composition and microstructure of the powder,and the carbonization result was also judged by comparing the WC powder.The results show that the powder with main phase composition of(W,Mo)C can be successfully prepared by co-reduction carbonization method.When the carbon content(W/Mo∶C)is greater than 1∶1.0 and the carbonization temperature is higher than 1700℃,the carbon content and carbonization temperature have no obvious influence on the phase composition of(W,Mo)C powder.However,the microstructure and composition of the powder change significantly.When the carbon content is 1∶1.0 and 1∶1.1,and the carbonization temperature is 1700℃,1900℃and 2250℃,the phase composition of the powder is mainly(W,Mo)C without other phase components.When the carbon content is 1∶1.0,the surface of(W,Mo)C powder is smooth after carbonization at different carbonization temperatures,but the difficulty of powder crushing gradually increases.When the carbon content is 1∶1.1,fine particles appear on the surface of(W,Mo)C powder after carbonization at different temperatures.The TEM and EDS results confirm that the main component of the fine particles was C,indicating that the amount of carbon is too high in the samples.

关 键 词：碳含量 碳化 成分 结构 

分 类 号：TF125[冶金工程—粉末冶金]