Brown spinel pigments based on zinc chromite, method of their pr

Details Brown spinel pigments based on zinc chromite, method of their pr Brown spinel pigments based on zinc chromite, method of their pr

1992-09-18

1993-10-19

Klemanski, Helene

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106425, 106453, C09C 104, C09C 134

Patent

active

052541622

ABSTRACT:
Brown spinel pigments based on zinc chromite which are iron-free and exhibit an atomic ratio of chromium to zinc in a range of 1 to greater than 0.5 up to 2 are disclosed. Preferred pigments additionally contain manganese, in which instance the atomic ratio of Mn to Cr is a maximum of 0.2. The production of the pigments involves a firing process of a powder mixture consisting of the oxides the metals, or precursors thereof, contained in the pigment. Instead of previously known grayish-brown unattractive products, attractive brown pigments are obtained by means of the selected molar ratio and a baking temperature above 1200.degree. C. The novel pigments can be used in the presence of glass frits even at firing temperatures above 1200.degree. C. to 1500.degree. C. and are suitable for a common firing of ceramic carrier and decoration.

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Eppler, R.A., "Selecting Ceramic Pigments", American Ceramic Society (1987), vol. 66, pp. 1600-1604.

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