The glass coating is applied to a glass surface by 1)a method such as a vacuum method or an electroless plating method, or 2) using a plasma exchange method. Glass coating has a variety of colors such as gray, gold, blue, green, and brown.
The performance principle of glass coating is mainly the principle of thin film optics. While utilizing the infrared reflection performance of certain film materials, the interference effect of the film in the visible spectrum is utilized, and the thickness of the film is adjusted to achieve both the heat reflection function and the desired reflection color.
The production process of glass coating includes: vacuum evaporation, sol-gel coating, on-line spray thermal decomposition coating, vacuum cathode magnetron sputtering coating and other processes. At present, the domestic and international methods for commercializing large-area coated glass are vacuum cathode magnetron sputtering coating and on-line spraying thermal decomposition coating.
The on-line spray thermal decomposition coating is in the pre-annealing zone of the float glass. The on-line thermal reflection coating is spraying the organometallic compound on the upper surface of the glass. The high temperature of the glass causes the organometallic compound to decompose into metal oxide in the air to form a film. Multi-layer film can be sprayed, but the optical performance control is difficult. The product belongs to the hard film series. The film surface can be used inward or outward. The product can be cut, edging, drilling, or heat treated. It can be used in a single piece, but Poor optical performance and few product types.
The on-line low-emission (Low-E) coating directly sprays the liquid metal powder onto the surface of the hot glass, and as the glass cools, the metal film becomes part of the glass. Therefore the film layer belongs to the hard film system. The product can be hot bent, tempered and stored for a long time. However, the thermal performance is relatively poor, unless the film is relatively thick, otherwise the “U” value is only half of the sputtering Low-E coated glass.
Vacuum cathode magnetron sputtering coating, also known as offline coating, is the most advanced process for producing large-area coated glass in the world. Compared with the traditional coating method, it has significant improvement in product quality, function, labor productivity and cost. Vacuum cathode magnetron sputtering coatings are also classified into heat reflective coatings and low-emission Low-E coatings.
The heat reflective coating means that the glass is placed in the vacuum chamber, and the reaction gas is introduced into the vacuum chamber. When the sputtering cathode is energized, the electric ions strike the metal particles under the action of the electric field to form charged particles, and the particles are deposited on the glass to form a film. With this method, the production of a multilayer film can be performed, and a large amount of materials can be formed. The off-line heat reflective coating has a firm and uniform film layer, stable chemical properties, and a variety of desirable optical properties and rich reflective colors.
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