Evaporation Boats: A Key Player in Vacuum Coating

Evaporation boat is a generic term for all evaporation vessels, and its composition formula varies according to the use of different applications. The materials involved include boron nitride, titanium diboride, aluminum nitride, alumina, zirconia, silicon carbide, silicon nitride, and a variety of metal and non-metal compounds, etc. In the 19th century, graphite was widely used to make evaporation boats, but due to pollution and low life expectancy problems, it is rarely used today.
Evaporation boats are used in a wide range of applications, including vacuum evaporation packaging materials, capacitor metallization coating, display coating, hot stamping coating, anti-counterfeiting sign coating, reflective coating, and paper and textile aluminizing, etc. They are mainly used for evaporation of metals such as aluminum, copper, silver, and gold.
Review its development history, the 19th century graphite boat in many industries has been eliminated. 20 century late, by the boron nitride titanium diboride composite conductive ceramic processed products began to become popular. Boron nitride has a high degree of insulation, titanium diboride has a high degree of conductivity, through the adjustment of the two materials in different ratios, can easily control the resistivity of the products made. However, the domestic raw material preparation process was relatively backward, the traditional method of preparation of boron nitride low crystallinity, impurities, low purity, and the preparation process will produce a large number of harmful gases and waste liquids, serious harm to the environment and individuals, the central and local governments plan to outlaw the relevant process before 2015. The preparation of domestic titanium diboride carbon thermal reduction method, the use of low-efficiency carbon tube furnace, by the furnace and process limitations, the titanium diboride produced at 1600 degrees of crystalline particles are very small, the purity of only about 90%, high impurity content, resulting in the production of the evaporation of the boat resistance is not stable, poor corrosion resistance. Compared with it, foreign boron nitride, titanium diboride preparation process is advanced, the purity can reach above 99%. Germany as the representative of the evaporation boat manufacturer has a strong research center, in the preparation of basic raw materials, significant results, the evaporation boat made long life, corrosion resistance, high evaporation efficiency and quality assurance. Happily, in 2011, there are individual companies in China have mastered foreign advanced technology, and combined with the current situation of China's industrial structure, exclusive research and development of a complete set of advanced production equipment, covering raw material processing, sintering processing to hot pressing processing and other aspects. The company has become the only domestic production base for high-quality boron nitride, titanium diboride and boron carbide. It is expected that with the concerted efforts of the government and the company, the annual output of 500 tons of high-purity ceramic powder (including 150 tons for self-consumption, 100 tons for domestic sales, and 250 tons for export) and 1.5 million conductive ceramic evaporator boats will be realized in 2013.
In the formula, the domestic production process due to the limitations of the international popular 2-component evaporation boat can not be produced, can only make a single 3-component evaporation boat. This 3-component evaporation boat is based on 2-component add a certain proportion of aluminum nitride, its formula density, more material, only applicable to the traditional industry, it is difficult to meet the evaporation of strict quality requirements of the product. Even some companies add tungsten, calcium carbonate, calcium oxide, zirconium oxide, etc. on the basis of 3-component, this practice has gone into the components of the wrong area, which is more unfavorable to the quality control. And 2 components evaporation boat in the international common application, because its composition is only boron nitride and titanium diboride, in the production process quality is easier to control, resistivity precision, evaporation efficiency is other components can not be compared. In addition, the 2-component evaporation boat low density, less material, easy production and processing, in line with the current concept of low-carbon environmental protection.
With the continuous progress and development of science and technology, I believe that the evaporation boat in the material, process and other aspects will continue to innovate and optimize, for the development of more industries to provide more powerful support and protection, in promoting the process of upgrading of various industries to play a more important role.

Shengyang New Material Co., Ltd. is committed to the production of boron nitride and boron nitride processed products, and can customize various boron nitride insulating ceramic parts according to customer needs. Contact us if necessary.
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