钨酸钠与天然土状石墨在高温氩气氛围中的转化过程

以Na2WO4为钨源,天然土状石墨为碳源,研究二者在高温氩气气氛下的转化过程及规律,利用X射线衍射(XRD)、扫描电子显微镜(SEM)及电子能谱(EDS)对产物进行分析。结果表明,Na2WO4与石墨的混合样品在氩气气氛下经高温处理,可以生成不同的碳钨化合物。首先,石墨与Na2WO4在接触界面发生还原反应,将Na2WO4还原为α-W2C和β-W2C;然后,随着石墨增多,当Na2WO4与石墨的质量比小于1:1时,石墨开始将α-W2C还原为α-WC,直至Na2WO4与石墨的质量比为1:5时,石墨可以将α-W2C完全转化为α-WC。...

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Bibliographic Details
Published inBeijing da xue xue bao Vol. 53; no. 1; pp. 50 - 56
Main Author 魏霖荫;传秀云;黄杜斌;苏双青;金时运
Format Journal Article
LanguageChinese
Published Beijing Acta Scientiarum Naturalium Universitatis Pekinenis 2017
北京大学地球与空间科学学院,北京,100871
Subjects
Argon
Atmosphere
Carbon sources
Chemical reduction
Graphite
High temperature
Scanning electron microscopy
Sodium
Sodium tungstate
Soil temperature
Tungsten
X-ray diffraction
石墨;Na2WO4;WC;高温处理;X射线衍射(XRD);扫描电子显微镜(SEM);电子能谱(EDS)
sodium tungstate
扫描电子显微镜(SEM)
high-temperature treatment
电子能谱(EDS)
XRD
WC
graphite
X射线衍射(XRD)
Na2WO4
EDS
SEM
石墨
tungsten carbide
高温处理
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Summary:以Na2WO4为钨源,天然土状石墨为碳源,研究二者在高温氩气气氛下的转化过程及规律,利用X射线衍射(XRD)、扫描电子显微镜(SEM)及电子能谱(EDS)对产物进行分析。结果表明,Na2WO4与石墨的混合样品在氩气气氛下经高温处理,可以生成不同的碳钨化合物。首先,石墨与Na2WO4在接触界面发生还原反应,将Na2WO4还原为α-W2C和β-W2C;然后,随着石墨增多,当Na2WO4与石墨的质量比小于1:1时,石墨开始将α-W2C还原为α-WC,直至Na2WO4与石墨的质量比为1:5时,石墨可以将α-W2C完全转化为α-WC。
Bibliography:Using sodium tungstate as tungsten source,natural soil shaped graphite as carbon source,an experiment isprovided for researching the transformation process and rules of them in argon atmosphere at high temperature.The finalproducts are studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive spectrometer(EDS),etc.The result shows that the mixed samples of sodium tungstate and graphite can generate different tungstencarbon compounds in an argon atmosphere with heat treatment.First,reduction reaction occurs between mixedgraphite and sodium tungstate dihydrate at the reaction interface,reducing sodium tungstate dihydrate toα-W2C andβ-W2C.Second,when the mass ratio of Na2WO4:C is less than1:1,reduction ofα-W2C toα-WC occurs,till the mass ratiowas1:5,andα-W2C can be reduced toα-WC completely.
graphite; sodium tungstate; tungsten carbide; high-temperature treatment; XRD; SEM; EDS
11-2442/N
ISSN:0479-8023
DOI:10.13209/j.0479-8023.2016.052