Study on Preparation Process of W-Al_2O_3 Composite Powder AITranslate
Abstract AITranslate
Al2 O3-doped W powder was prepared by sol-gel, azeotropic distillation and hydrothermal synthesis to produce W-Al2 O3 composite powder by calcination and two-step H2 reduction. Based on XRD analysis and SEM observation, stable monoclinic WOa and metastable hexagonal WO3 were obtained by calcination of Al2 O3-doped W powder prepared with the above-mentioned three methods. The morphology of the powder prepared by hydrothermal synthesis is regular, uniform and spherical. WO3 is reduced to low-valence WO2 and unsaturated-valence WO3-x by the primary H2 reduction,and fine W-Al2 O3 composite powder is obtained by the secondary H2 reduction. Compared with the other two methods, sol-gel method has more obvious refinement effect and it can prepare W-Al2O3 composite powder with nanoscale particle size, since Al2 O3 coated on the surfaces of W particles inhibits the deposition of tungsten atom during subsequent reduction.
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Basic Information:
DOI：
Chinese Library Classification Number:TG146.411[金属学及工艺—金属材料]
Citation Information:
Al2 O3-doped W powder was prepared by sol-gel, azeotropic distillation and hydrothermal synthesis to produce W-Al2 O3 composite powder by calcination and two-step H2 reduction. Based on XRD analysis and SEM observation, stable monoclinic WOa and metastable hexagonal WO3 were obtained by calcination of Al2 O3-doped W powder prepared with the above-mentioned three methods. The morphology of the powder prepared by hydrothermal synthesis is regular, uniform and spherical. WO3 is reduced to low-valence WO2 and unsaturated-valence WO3-x by the primary H2 reduction,and fine W-Al2 O3 composite powder is obtained by the secondary H2 reduction. Compared with the other two methods, sol-gel method has more obvious refinement effect and it can prepare W-Al2O3 composite powder with nanoscale particle size, since Al2 O3 coated on the surfaces of W particles inhibits the deposition of tungsten atom during subsequent reduction.
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| GB/T 7714-2015 | [1] ZHAO Yang, WEI Shi-zhong, PAN Kun-ming, et al. Study on Preparation Process of W-Al_2O_3 Composite Powder[J]. Rare Metals and Cemented Carbides, 2017(3): 25-30. |
| MLA | [1] ZHAO Yang, et al., "Study on Preparation Process of W-Al_2O_3 Composite Powder." Rare Metals and Cemented Carbides, no. 3, 2017, pp. 25-30. |
| APA | [1] ZHAO Yang, WEI Shi-zhong, PAN Kun-ming, DAN Kang-ning, YAO Li-ying, & SONG Xiang-yang. (2017). Study on Preparation Process of W-Al_2O_3 Composite Powder. Rare Metals and Cemented Carbides(3), 25-30. |
| IEEE | [1] ZHAO Yang, WEI Shi-zhong, PAN Kun-ming, DAN Kang-ning, YAO Li-ying, and SONG Xiang-yang, "Study on Preparation Process of W-Al_2O_3 Composite Powder," Rare Metals and Cemented Carbides, no. 3, pp. 25-30, 2017. keywords: {W-Al2O3 composite powder;sol-gel method;azeotropic distillation;hydrothermal synthesis;calcination;two-step H2 reduction} |