Phase Transformation and Microstructure Characterization of W-ZrO_2 Composite Powder Prepared by Azeotropic Distillation AITranslate
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W-2%ZrO_2composite powder was prepared via azeotropic distillation using(NH4)6H2W12O40·xH2O and Zr(NO3)4·3H2O as the raw materials,and CH3CH2 OH and CH3CH2CH2CH2 OH as the dispersants.Phase,morphology and microstructure of the products obtained from different preparation stages were analyzed using XRD,SEM,EDS and TEM,respectively.The results show that the composite complex of WO3 · mH2 O and Zr(WO4)2·nH2O is produced due to the coprecipitation reaction between(NH4)6H2W12O40·xH2O and Zr(NO3)4·3H2O during azeotropic distillation.The composite complex has better dispersibility without hard aggregates than the precursor powder prepared by evaporation crystallization,and transforms into the mixed oxide power consisted of WO3 and m-ZrO_2 by 750℃calcination.After 750 ℃×2hreduction and then 800 ℃×2hreduction,the composite powder still has WO_2-coated ZrO_2 particles with oval wormlike shape and 10~15nm particle size.When the temperature in the second reduction stage is improved to 900 ℃,the mixed oxide power completely transforms into W-ZrO_2 composite powder of polyhedron spherical and square morphology.
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Basic Information:
DOI：
Chinese Library Classification Number:TB383.3[一般工业技术—材料科学与工程]
Citation Information:
W-2%ZrO_2composite powder was prepared via azeotropic distillation using(NH4)6H2W12O40·xH2O and Zr(NO3)4·3H2O as the raw materials,and CH3CH2 OH and CH3CH2CH2CH2 OH as the dispersants.Phase,morphology and microstructure of the products obtained from different preparation stages were analyzed using XRD,SEM,EDS and TEM,respectively.The results show that the composite complex of WO3 · mH2 O and Zr(WO4)2·nH2O is produced due to the coprecipitation reaction between(NH4)6H2W12O40·xH2O and Zr(NO3)4·3H2O during azeotropic distillation.The composite complex has better dispersibility without hard aggregates than the precursor powder prepared by evaporation crystallization,and transforms into the mixed oxide power consisted of WO3 and m-ZrO_2 by 750℃calcination.After 750 ℃×2hreduction and then 800 ℃×2hreduction,the composite powder still has WO_2-coated ZrO_2 particles with oval wormlike shape and 10~15nm particle size.When the temperature in the second reduction stage is improved to 900 ℃,the mixed oxide power completely transforms into W-ZrO_2 composite powder of polyhedron spherical and square morphology.
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| GB/T 7714-2015 | [1] XIAO Fang-nao, XU Liu-jie, ZHOU Yu-cheng, et al. Phase Transformation and Microstructure Characterization of W-ZrO_2 Composite Powder Prepared by Azeotropic Distillation[J]. Rare Metals and Cemented Carbides, 2015(6): 39-45. |
| MLA | [1] XIAO Fang-nao, et al., "Phase Transformation and Microstructure Characterization of W-ZrO_2 Composite Powder Prepared by Azeotropic Distillation." Rare Metals and Cemented Carbides, no. 6, 2015, pp. 39-45. |
| APA | [1] XIAO Fang-nao, XU Liu-jie, ZHOU Yu-cheng, PAN Kun-ming, & WEI Shi-zhong. (2015). Phase Transformation and Microstructure Characterization of W-ZrO_2 Composite Powder Prepared by Azeotropic Distillation. Rare Metals and Cemented Carbides(6), 39-45. |
| IEEE | [1] XIAO Fang-nao, XU Liu-jie, ZHOU Yu-cheng, PAN Kun-ming, and WEI Shi-zhong, "Phase Transformation and Microstructure Characterization of W-ZrO_2 Composite Powder Prepared by Azeotropic Distillation," Rare Metals and Cemented Carbides, no. 6, pp. 39-45, 2015. keywords: {W-ZrO2 composite powder;azeotropic distillation;phase transformation;microstructure} |