粉末冶金材料科学与工程
粉末冶金材料科學與工程
분말야금재료과학여공정
POWDER METALLURGY MATERIALS SCIENCE AND ENGINEERING
2015年
2期
175-181
,共7页
朱二涛%羊建高%戴煜%张翔%邓军旺%郭圣达%吴杰
硃二濤%羊建高%戴煜%張翔%鄧軍旺%郭聖達%吳傑
주이도%양건고%대욱%장상%산군왕%곽골체%오걸
偏钨酸铵%有机碳%喷雾干燥%TG-DSC-DTA%XPS%钨钴氧化物
偏鎢痠銨%有機碳%噴霧榦燥%TG-DSC-DTA%XPS%鎢鈷氧化物
편오산안%유궤탄%분무간조%TG-DSC-DTA%XPS%오고양화물
ammonium metatungstate%organic carbon%spray drying%TG-DSC-TDA%XPS%tungsten-cobalt oxide
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。
以偏鎢痠銨(AMT)、醋痠鈷 Co(CH3COO)2·4H2O、有機碳為原料,通過噴霧榦燥得到前驅體粉末,然後在氮氣氛下煅燒製備鎢鈷氧化物複閤粉末;併對 AMT、醋痠鈷及前驅體粉末進行 TG-DSC-DTA 分析,用 XPS對鎢鈷氧化物粉末進行價態分析,以X射線衍射對鎢鈷氧化物粉末進行物相分析,用SEM對粉末進行形貌分析。結果錶明:煅燒溫度550℃、氮氣流量6.5 m3/h、煅燒時間20 min製備的鎢鈷氧化物粉末粒度為10~125μm,平均粒度為50μm,產物為裂解碳、WO3、Co3O4。此溫度可避免AMT分解生成的WO3在水蒸氣作用下生成鎢水化物WO2(OH)2;避免WO2(OH)2在H2作用下還原成W粉;及避免W粉沉積在早先被還原的W覈上使W粉顆粒長大。
이편오산안(AMT)、작산고 Co(CH3COO)2·4H2O、유궤탄위원료,통과분무간조득도전구체분말,연후재담기분하단소제비오고양화물복합분말;병대 AMT、작산고급전구체분말진행 TG-DSC-DTA 분석,용 XPS대오고양화물분말진행개태분석,이X사선연사대오고양화물분말진행물상분석,용SEM대분말진행형모분석。결과표명:단소온도550℃、담기류량6.5 m3/h、단소시간20 min제비적오고양화물분말립도위10~125μm,평균립도위50μm,산물위렬해탄、WO3、Co3O4。차온도가피면AMT분해생성적WO3재수증기작용하생성오수화물WO2(OH)2;피면WO2(OH)2재H2작용하환원성W분;급피면W분침적재조선피환원적W핵상사W분과립장대。
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.