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Research on the Surface Metallization of Ceramics and Glasses and Their Properties

Author: LiPeng
Tutor: LiBingZhong
School: Research Institute of Mechanical
Course: Mechanical Design and Theory
Keywords: Arc spraying Flame spraying Eddy current effect Magnetocaloric effect Functional coating Ceramic metallization
CLC: TQ174.64
Type: Master's thesis
Year: 2009
Downloads: 126
Quote: 0
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Abstract


As functional ceramic technology continues to evolve, more and more demanding requirements for surface modification of ceramic materials, ceramic surface metallization preparation performance functional ceramics one of the key technologies. Present in the ceramic, the surface of the glass by preparing a metal coating reaches the surface modification of ceramic materials by chemical plating, vacuum plating mainly, but the chemical deposition efficiency is low, the bonding strength is not high; vacuum plating requires a vacuum chamber, as well as other auxiliary equipment, the deposition efficiency is low, there are certain limitations to the size of the workpiece. Thermal spray technology is an effective method to solve the ceramic surface metallization, coating deposition, high efficiency, uniform coating composition, the size of the workpiece is not strictly required, simple process. Fully understand the characteristics of thermal spray process and the thermal spray coating is formed on the basis of mechanism, to explore the feasibility of using a thermal spray technique, a metal coating was prepared in the glass ceramic surface on the glass ceramic surface-modified to achieve, and coating magneto-thermal properties of some of the research. In this paper, ceramics, glass material surface morphology texture and hard, easy to rattle characteristics, is different from the traditional blasting surface preparation process means, first of ceramics, glass material surface using chemical solvents to clean the activation ceramics, glass, and then heated to a certain temperature for spraying, a detailed study of the influence of the type of heating temperature for the bonding strength between the metal coated with ceramic, glass base material, and with the use of conventional blasting pretreatment process. obtained by coating the bonding strength than the solution. Found, using the coating obtained by heating the combination of strength, more traditional sand blasting pretreatment process has been greatly improved, and different heating temperature of the bonding strength between the metal coating and the substrate material has a significant affected. The environmental scanning electron microscope (ESEM) and X-ray diffraction analysis (XRD) techniques conducted in-depth studies on the binding mechanism of the metal coating, the coating sectional ESEM results found, after suitable pretreatment temperature of the obtained metal coated layer and the glass substrate material between the local mutual fusion phase region was characterized by XRD analysis of the fusion phase region, these fusion phase region Al 2 SiO 5 composite oxide , proves to occur between the metal coating and the glass-ceramic substrate material under appropriate conditions, the field diffusion, it is the important reason leading to greatly improve the coating binding force, the rich and the development of a combination of conventional thermal spray coatings as theory. A further study found that fusion the phase Al 2 SiO , 5 composite oxide as the pretreatment temperature rises, it grew up, resulting in coating glass reduces the bonding strength between. Compared with the arc spraying process, the flame-sprayed on the glass has a continuous heating effect to promote the growth of the Al 2 SiO 5 composite oxides, reducing the bonding strength of the coating arc spraying process the bonding strength of the coating is higher than the flame spraying process. Proposed in this paper is different from the traditional blasting pretreatment process, the use of chemical solvents, cleaning, activation, heating pretreatment, to lay the foundation for the preparation of the ceramics and glass surface metallization coating. On the basis of the above studies, respectively, in the ceramic and the surface of the glass base material was successfully prepared a composite metal coating having good magnetic pyrogenic effect, the design of the magnetic composite coating system, defined in each coating layer in the composite coating studied the magnetically permeable layer, surface decorative layer magnetic pyrogenic. The results showed that magnetically permeable composite coatings magnetocaloric the greatest impact, different magnetic materials are relatively large differences in the magnetocaloric by vibrating sample magnetometer (VSM) analysis, the hysteresis loss of the coating system are relatively small, HO8 low-carbon steel 2Cr13 stainless difference of magnetic permeability in the high frequency magnetic field to cause the type of the magneto-thermal conversion efficiency between the two coating systems, surface decorative layer material has a limited impact on the entire coating system magnetic pyrogenic, the resistance of Al rate ratio of Zn to be small, resulting in a small resistivity of aluminum as a surface layer of the coating system, and aluminum as a surface layer of the coating system, therefore, a large eddy current effect, magneto-thermal conversion efficiency.

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