The Study Of Laser Processing On Peacock Blue Glaze

Laser processing of ceramic glaze decoration is a new method of application of laser technology. Laser processing of ceramic glaze decoration is also a new breakthrough in the field of ceramic glaze decoration. Compared with traditional method of the glaze decoration, laser processing glaze is more convenient, fast, and low cost in small-batch and single-piece ceramic production. So it has a good prospect of application. These qualities give laser processing potential application in ceramic glaze decoration. Laser processing surface of engineering ceramics and functional ceramics has been widely reported.However, using laser technique on the traditional ceramics and ornaments production is rare, especially on processing glaze surface, it is still in the exploring stage. Somebody has researched a new method for laser processing micro-cracks glaze in China. Laser transient temperature field results in the rapid heating and cooling of the operating area, which leads to the temperature gradient on the glaze surface. However, the temperature gradient results in thermal stress on the glaze surface. Excessive thermal stress on the glaze surface makes it difficult to achieve the smoothness of the traditional ceramic. Moreover, the crack is very difficult to eliminate. But, as ornamental art ceramic works, micro-crack glaze is also a kind of artistic creation.In this paper, the laser processing is used to clad glaze on the clay body of porcelain. It mainly discusses the connection between the glazed smoothness, gloss, color change, thermal stability, micro-cracks and the laser processing parameters. There are many processing parameters that affect the glaze quality in laser processing glaze. These processing parameters include the laser power, laser scanning speed, the defocus amount, the chemical composition of the glaze powders and the clay body, the stability of the pigment, the thickness of the glaze slurry, the particle size of the glaze powders and laser cladding atmosphere, et al. So it is difficult to consider all the factors. This article focuses on laser power, laser scanning speed, the thickness of the glaze slurry.The conclusions are as follows:1. When the laser power is a fixed value, there is a good and long transitional region between overburning and underburning with the increase of laser scanning speed. However, an increase in laser power gradually shortened the transitional region until the region disappeared.2. The laser energy density Ea is proportional to the P/V, wherein P is the laser power, V is the scanning speed. When the laser energy density is enough to melt the glaze powders and the green body, the smaller the laser power is, the better the glaze quality is. The increase in laser power gives the glaze serious overburnt and underburnt appearance. The glaze quality begins to deteriorate.3. The reflection spectrum of the UV-visible spectrophotometer shows that an increase in laser scanning speed gives the glazed surface unconspicuous color change when the laser power is a fixed value. With the increase of laser power, the color change becomes conspicuous.4. The crystal composition of the glaze is analysised by the X-ray diffraction. The conclusions show that an increase in the scanning speed results in the change in composition of glass phase and microcrystalline. The microcrystalline can effectively reduce the thermal stress and reduce the glazed micro-cracks.5. The cross-sections between the glaze and the clay body are observed by scanning electron microscope (SEM). It shows that the glazed surface and the clay body are bonded tightly. The glaze layer has a few tiny bubbles, but the content is much lower than that of porcelain products calcined in traditional kilns.6. The samples clad by laser beam are placed in an electric furnace for30min at220℃. The samples are then thrown into water with a temperature of20℃for10min. Finally, the samples are checked for glaze macro-crack. The conclusions show that macroscopic cracks appear in the critical area between the mature and underburnt glazed surface.7. The thickness of the glaze slurry affects the glaze quality. When the glaze slurry is too thick, the glazed surface curls into a teardrop orange glaze. When the glaze slurry is too thin, the glaze powders are penetrated completely the clay body. The glazed surface disappears.