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Solid-phase synthesis of cupric tungstate

Published online by Cambridge University Press:  31 January 2011

Leonid P. Dorfman ,
David L. Houck ,
Michael J. Scheithauer ,
Jeffrey N. Dann  and
Harry O. Fassett
Leonid P. Dorfman
Affiliation:
OSRAM SYLVANIA, Hawes Street, Towanda, Pennsylvania 18848
David L. Houck
Affiliation:
OSRAM SYLVANIA, Hawes Street, Towanda, Pennsylvania 18848
Michael J. Scheithauer
Affiliation:
OSRAM SYLVANIA, Hawes Street, Towanda, Pennsylvania 18848
Jeffrey N. Dann
Affiliation:
OSRAM SYLVANIA, Hawes Street, Towanda, Pennsylvania 18848
Harry O. Fassett
Affiliation:
OSRAM SYLVANIA, Hawes Street, Towanda, Pennsylvania 18848
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Abstract

The high degree of mixing of W and Cu phases in copper tungstates makes them an attractive source for manufacturing W–Cu composite powders. Hydrogen reduction of copper tungstates provides composite W–Cu powder products with a uniform, homogeneous dispersion of the metal phases. This paper presents test results for a variety of solid-phase reactions to synthesize cupric tungstate (CuWO4). Hydrated, dehydrated, and complex oxides of tungsten and copper have been used as solid reactants. With stoichiometric ratios of reactants, synthesis in air at 800 °C produced 96% to 100% conversion to CuWO4. Heterogeneous synthesis of CuWO4 with the participation of three solid phases (S1 + S2 →S3) required the simplest, most inexpensive equipment. The end product properties of synthesized CuWO4 could be controlled by the proper choice of reactants.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 4 , April 2001 , pp. 1096 - 1102
Copyright
Copyright © Materials Research Society 2001

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References

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