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Titanium Surface Treatment Technology
Titanium at high temperatures is easy to o, h, n, and the air element and embedding of Si, Al, Mg and other elements in the material reacts in the casting surface contamination on the surface layer, making it an excellent physical and chemical properties of variation, hardness, plastic and elastic to reduce, increase in brittleness. The density of titanium, the molten titanium flow inertia small, illiquid melting titanium castability. Casting temperature and mold temperature (300 degrees) is large, fast cooling, casting in the protective atmosphere, surface of titanium castings and interior are inevitably bugs such as porous appearance to cast a great influence on the quality. Therefore, the surface treatment of titanium castings and is more important compared to other dental alloys.
Due to the unique physical and chemical properties of titanium, such as small coefficient of thermal conductivity, low surface hardness, elastic modulus, viscosity, low conductivity and oxidation, the surface treatment of titanium brings a great deal of difficulty by conventional methods of surface treatment is difficult to achieve the desired results must be used for special processing methods and means of operation. Casting of late surface processing not only is to get smooth light of surface, reduced food and the bacteria spot, of accumulation and stick attached, maintained patients of normal of oral micro-ecological of balance, while also increased has denture of beauty; more important of is through these surface processing and modified sex process, improved casting of surface characters and for sex, improve denture of wear, and resistance corrosion and anti-stress fatigue, physico-chemical characteristics.
Surface reaction layer is the main factors influencing the physical and chemical properties of titanium castings, in front of the grinding and polishing of titanium castings, must achieve completely remove surface contamination layer, to achieve a satisfactory polishing effect.The surface reaction layer of titanium can be completely removed by means of acid wash after blasting.
Titanium easily and at high temperature in the air O, H, N and other elements and the embedding material of Si, Al, Mg and other elements, the casting surface contamination forms on the surface, make its excellent physical and chemical properties, hardness, plasticity, elastic, brittleness increased.