CHEN  Zongling, GU  Xingyong, HU  Keyan

(School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen Jiangxi 333403, China)

Abstract:A kind of low-cost coblat free black pigments of Cr-Fe-Ni-Cu system is studied. Effects of chromite amount on the chromaticity and average lattice constant of pigments and the relationship between L* value and the average lattice constant are investigated. The chromaticity of pigments was tested by digital whiteness meter and spectrophotometer, while phase structure and crystal form were identified by XRD. The experimental results show, by replacing 10~30 wt% chromic oxide with chromite, a good low-cost cobalt free black pigment was obtained, which could absorb all monochromatic light in visible light band homogeneously. It's a type of ceramic pigments with the following chromatic indexes: L*=26.93~29.84, a*=0~2.91and b*=0.06~1.63. The average lattice constant was closely related to L* value. With the average lattice constant increasing,L* value increased gradually.

Keywords:Cr-Fe-Ni-Cu system, black pigment, chromite, chromatic performance, the average lattice constant