What Is Molybdenum Disilicide Coating？
Coating (coating) is a coating obtained by applying a solid continuous film is to protection, insulation, decorative purposes, coated metal, fabrics, plastic and other plastic film on the substrate. Coatings can be gaseous, liquid, solid, typically matrix determined according to the paint spray type and status.
Molybdenum disilicide refractory metal intermetallic compound, which has unique properties. Such as medium density (6.24g · cm-3), melting point (2 030 ℃), low thermal expansion coefficient (8.1 × 10-6K-1), oxidation resistance and chemical inertness, particularly high temperature oxidation resistance silicide UN crown. This unique feature from the automatic generation of SiO2 film; the latter at high temperature and an oxidizing atmosphere to form, it is a non-spalling oxide, when the temperature is higher than 900 ℃, molybdenum disilicide SiO2 film formed on the surface, so that in itself can be obtained heat and thermal cycling protection, and automatic generation of SiO2 in the fracture healing achieved cooperation with.
Molybdenum disilicide is widely used, mainly used in iron oxidation furnace, composites, glass industry, aviation and space vehicles, etc., followed by molybdenum disilicide film as a gate silicon IC contacts; thick film for high-temperature oxidation protective materials.
History of the silica coating
1967 Soviet Institute of Chemical Physics А.Г. Maltz and Han invented the self-propagating (SHS) metallurgical technology. 1976 Soviet union more than 30 different organizations involved in the SHS process methods of research and development, the development of more than 200 kinds of synthetic material, wherein at least two or more into production, such as molybdenum disilicide and titanium carbide, which is used for industrial diamonds substitutes; former as the heating element. Sweden is currently the world's "Candal" heating elements produced better quality, but the price is more expensive.
In recent years, the United States, Japan and Poland and other countries SHS method has generated strong interest. Domestic Tianjin Chemical Engineering Research molybdenum disilicide earliest. Successively in Luoyang, Shanghai production of molybdenum silicide heating elements, but the product quality and a certain distance from abroad. Since molybdenum disilicide Products biggest drawback - brittle, while domestic production of molybdenum products is not dense, the surface is not smooth and more defects. This article describes the molybdenum and molybdenum alloy products molybdenum disilicide for use on protective coating, so that defects compensate each other.
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