Carbothermic reduction of scheelite (CaWO4) doped with cobalt or nickel
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- 作者：Elena Palmieria ; Andrea Marcuccia ; GianCarlo Marchesellib ; Adriana De Stefanisc ; Riccardo Polinia ; polini@uniroma2.it" class="auth_mail" title="E-mail the corresponding author
- 关键词：Carbothermic reduction ; Scheelite ; Catalysis ; Cobalt ; Nickel ; WC powders ; X-ray diffraction ; Nanoparticles
- 刊名：International Journal of Refractory Metals and Hard Materials
- 出版年：2016
- 出版时间：September 2016
- 年：2016
- 卷：59
- 期：Complete
- 页码：93-99
- 全文大小：1246 K
文摘
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Co and Ni have a catalytic effect on the carbothermic reduction of CaWO4.
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Co and Ni catalyze both the two-step reduction of scheelite and the subsequent carburization of tungsten.
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Doping with Co or Ni allows the conversion of scheelite into nanostructured WC at temperatures as low as 950 °C.
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Adding Co or Ni to CaWO4:C mixtures allows reducing both the milling time and the temperature of the carbothermic reduction.