Selection and Effect of Ceramic Pigment Granularity

Ceramic pigment particles in the pigment fineness degree are often spoken by people, for a great color and tone color effect. At present most of the calcined pigment particles, the average grain size of 1 microns -10 microns. Screening [325] is to choose the most suitable particle size distribution.

Ceramic pigment particle size Is it right? Smaller is better?
Is not the pigment particle size color effect. Pigment at the dissolution degree melting glaze performance for surface volume per unit volume of pigment function of ceramic pigment, surface area and particle size is inversely proportional to.
Because the pigment particle size smaller, solubility in glaze more in. It will cause is glaze dissolved, the formation of adverse effects. Such as the content of cobalt pigment is most easily dissolved cobalt present glaze flow phenomenon, so color glaze will form the color uneven defects. In addition also should control the pigment particles of maximum diameter, to prevent pigment particles formed the inhomogeneous surface. Some Ceramic Colors enterprises in the form of pigment processing experience, that the maximum particle size processing pigment glaze layer to lower than 1/10 is appropriate.
The choice of granularity
Ordinary glaze particle size about 20 microns is preferred. In the production of pigments, calcined by grinding method for deciding ceramic pigment fineness. But some paint on the ground instead of the color intensity. The reason is that the reason of grinding pigment particles are exposed new is not color surface, forming a superfluous result. The zirconium color material is most likely to form the phenomenon. Therefore, in the use of pigments, pigment particle size should choose the optimal particle size, to ensure that it has sufficient dispersion in the best color intensity.
Effect of various Ceramic Pigment
Two aspects of package material including particle size and gradation is usually much day sieve margin to express, this method can only measure the ultimate particles. Until the advent of the laser particle size analyzer for measuring the size of laser diffraction method, this phenomenon can be solved thoroughly for the pigment particle size.
★ black material, especially the black material containing cobalt, the smaller the particle size of blackness is better. Brown particle size decreases. The general red, yellow and increases, but the depth of color will make explicit shallow.
★ Co - Si system of song blue ion colouring material. In Opacified Glaze particle size smaller, more uniform to a package; transparent glaze, glaze with decreasing grain size free sword Co+ increases into opportunities four coordinated, the purple Tone Blue yuan increase decrease.
★ Zirconium Silicate Pigment (zirconium color) crystal structure is relatively stable. Little effect size changes within a certain range of colors. But because of zirconium silicate is a kind of strong opacifying agent, size reduction, enhanced opacifying ability, will reduce the color depth. We keep on pigment particle size standard deviation of R medium. The grinding time in glazes must strictly control.
★ wrong vanadium yellow pigment (Zr ~ V) belongs to the "mordant dyeing type" pigment, poor structural stability, effect of particle size on the tone is obvious, therefore, the general should be the basic ground in the glaze is added after mixing.
★ inclusion stains although also belongs to the zirconium silicate type, but is very sensitive to the particle size. Long time grinding the zirconium silicate character is damaged, resulting in hair color lighter, more defects. Therefore, inclusion stains should also be in the glaze grinding after adding mixed use.