Causes and effects of defects in titanium castings
Publish Time:
2020-12-17
Formation of surface defects in titanium castings: Titanium has a low density, and the molten titanium has low flow inertia during melting, resulting in a low casting flow rate. The temperature difference between casting temperature and mold temperature is relatively large, leading to very rapid cooling. Casting is performed in a protective atmosphere, but defects such as pores are inevitable on the surface and inside of titanium castings, which significantly impacts the quality of the castings.
Therefore, surface treatment of titanium castings is extremely important. Due to titanium's special physical properties, such as low thermal conductivity, low surface hardness, low elastic modulus, high viscosity, low electrical conductivity, and easy oxidation, surface treatment of titanium becomes very difficult. Conventional surface treatment methods struggle to achieve ideal results, necessitating the use of special processing methods and operational techniques.
The post-processing surface treatment of titanium castings is not only for achieving a smooth and shiny surface, such as for titanium cast teeth, where in addition to a smooth surface, it can also reduce the accumulation and adhesion of food and plaque, maintain the normal oral micro-ecological balance for patients, and also enhance the aesthetic appeal of titanium teeth; more importantly, through these surface treatment and modification processes, the surface characteristics and suitability of the casting are improved, enhancing the physicochemical properties of titanium teeth such as wear resistance, corrosion resistance, and resistance to stress fatigue.
keyword： Titanium castings,Melt
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