Things About Ceramic Gloss You Need to Know! | Gloss Tester
1. What is ceramic gloss?
Ceramic gloss is a characteristic of the porcelain glazes surface. When exposed to light, due to factors such as the smoothness of the glaze surface, the reflective ability (specular reflection) of the different porcelains glaze surface in a certain direction is different, so the gloss level is also different. Glaze gloss is also related to its refractive index. The higher the refractive index, the higher the gloss.
To put it simply, the ceramics gloss we are talking about is "reflective" ability. A beam of light illuminates the ceramic surface and the “brighter” we observe at its specular reflection angle, the stronger its glossiness. Of course, the difference in the light incidence angle and the observation of the reflection angle will lead to differences in our judgment of glossiness.
2. Factors affecting ceramic gloss
The ceramics gloss is mainly affected by the surface glaze and roughness. The glaze layer of ceramic products is generally a glass with a thickness of 0.1mm, which has a certain color and is mixed with a few crystals and pores. The glaze layer gloss will cause a difference in the gloss of the ceramic surface.
(1) Glaze recipe
The firing temperature of the glaze should be compatible with the green body. Under a predetermined firing atmosphere and firing temperature, a uniform glass phase structure is generated as much as possible. The viscosity of the glaze solution is slightly greater than 2000 poise. The expansion coefficient of the glaze should be smaller than the expansion coefficient of the blank. When arranging the blanks, high-refractive materials can be used to make glazes with high gloss.
(2) Glaze making process
The clay raw materials for glaze are selected to remove impurities and organic matter. The clay containing free quartz and mica is pre-washed to improve purity. For those raw materials in the glaze that have a large change in heating volume, it is best to calcinate them separately and then mix them, that is, to introduce them into the glaze in the form of clinker to stabilize the crystal form and v