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首页> 中文期刊> 《粉末冶金材料科学与工程》 >喷雾干燥-煅烧制备钨钴氧化物粉末的反应机理

喷雾干燥-煅烧制备钨钴氧化物粉末的反应机理

         
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摘要

以偏钨酸铵(AMT)、醋酸钴 Co(CH3COO)2·4H2O、有机碳为原料，通过喷雾干燥得到前驱体粉末，然后在氮气氛下煅烧制备钨钴氧化物复合粉末；并对 AMT、醋酸钴及前驱体粉末进行 TG-DSC-DTA 分析，用 XPS对钨钴氧化物粉末进行价态分析，以X射线衍射对钨钴氧化物粉末进行物相分析，用SEM对粉末进行形貌分析。结果表明：煅烧温度550℃、氮气流量6.5 m3/h、煅烧时间20 min制备的钨钴氧化物粉末粒度为10～125μm，平均粒度为50μm，产物为裂解碳、WO3、Co3O4。此温度可避免AMT分解生成的WO3在水蒸气作用下生成钨水化物WO2(OH)2；避免WO2(OH)2在H2作用下还原成W粉；及避免W粉沉积在早先被还原的W核上使W粉颗粒长大。%Using ammonium metatungstate (AMT), cobalt acetate (Co(CH3COO)2·4H2O) and organic carbon source as raw materials, precursor powder was prepared through spray drying, then was calcined in N2 to prepare W-Co oxide composite powder. TG-DSC-DTA analysis was applied on AMT, cobalt acetate and precursor powder, XPS was used to analyse valence state of W-Co oxide composite powder; XRD was used to analuse phase composition of W-Co oxide composite powder, SEM was used to analyse morphology of the powder. The results show that, the particle size of W-Co oxide powder prepared at 550℃ with 6.5m3/h N2 for 20 min is 10~125μm, and average particle size is 50μm. The products by calcining W-Co oxide are cracking carbon, WO3 and Co3O4. It is at 550℃ that WO3 generated by AMT decomposition can be avoided to produce WO2(OH)2 under the effect of water vapor, WO2(OH)2 can be avoided from reducing to W powder in H2, W powder can be avoided from depositing on W core, which makes W powder particles growing.

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