The controlled reduction of copper tungstate in H2O/H2 mixtures
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The controlled reductions of copper tungstate, copper tungstate plus blue tungsten oxide and CuO plus WO3 have been studied at temperatures of 500, 600 and 700δC using H2/H2O mixtures in a glass thermobalance. The copper-tungsten oxide composite powder products have been characterized by X-ray diffraction analysis and scanning electron microscopy. The morphologies of the copper-tungsten oxide products have been related to the morphologies of copper-tungsten powders obtained by dry hydrogen reduction. It is shown that widely varying copper-tungsten oxide morphologies may be obtained as precursors for metal powder production by control of the H2/H2O ratio in the reducing gas mixture.
KeywordsScanning Electron Microscopy Tungsten Oxide Product Diffraction Analysis Metal Powder
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- 1.A. K. Basu andF. R. Sale,Trans. Inst. Min. Metall. 86 (1977) C134.Google Scholar
- 2.Idem, ibid. 86 (1977) C169.Google Scholar
- 3.Idem, J. Mater. Sci. 13 (1978) 2703.Google Scholar
- 4.J. Guerassimov, Proceedings of the 16th IUPAC International Congress of Pure and Applied Chemistry, Paris (Butterworth, London, 1957) p. 227.Google Scholar
- 5.A. K. Basu andF. R. Sale,J. Mater. Sci. 10 (1975) 571.Google Scholar
- 6.Idem, ibid. 12 (1977) 1115.Google Scholar
- 7.G. R. St. Pierre, W. T. Ebihara, M. J. Poole andR. Speiser,Trans. Met. Soc. AIME 224 (1962) 259.Google Scholar
- 8.B. Pllips andL. L. Y. Chang,ibid. 230 (1964) 1203.Google Scholar
- 9.JANAF Thermochemical Tables: 2nd edn, US Department of Commerce, National Bureau of Standards (1971).Google Scholar