Medical titanium material The density of titanium alloy is only 4.51, which is smaller than that of steel and only half the weight of steel, but its strength is similar to that of ordinary carbon steel. Titanium belongs to thermodynamic unstable metal, which is very active. Titanium can form a natural oxide film (titanium dioxide) with air. This stable, strong adhesive, and protective oxide film determines the corrosion resistance of titanium, so titanium has excellent corrosion resistance. Next, it has light texture, high tensile strength, and good mechanical properties.

Titanium alloys can be divided into corrosion-resistant titanium alloys, structural titanium alloys, heat-resistant titanium alloys and low-temperature titanium alloys according to their applications.

1. It can be distinguished from the color. Titanium is a little dark, showing a cool color, I think it is very cool, titanium is a little darker than steel. Steel is white, the pale kind. The two colors are obvious.

2. It can also be distinguished by chemical method, that is, soaking with nitric acid. Titanium does not react, and the stainless steel will react strongly once it is put down. The difference between pure titanium and titanium alloy is hard to see from the appearance.

3. Titanium can mark gray and black marks on ceramic tiles, but stainless steel cannot.

4. Good corrosion resistance of titanium: titanium alloy is easy to form a dense oxide film below 550 ℃, so it is not easy to be further oxidized. It has high corrosion resistance to air, sea water, steam and some acids, alkalis and soft media.

5. Good thermal strength of titanium: The melting point of titanium alloy is 1660 ℃, which is higher than that of iron. It has high thermal strength, can work below 550 ℃, and has good toughness at low temperature.

6. Difficult titanium processing: welding, electroplating and cold stretching are very difficult. Welding and electroplating shall be carried out in vacuum or under the condition full of inert gas (vacuum ion plating)

Titanium alloys are widely used in various fields because of their high strength, good corrosion resistance and high heat resistance.

The density of titanium alloy is generally about 4.51g/cm3, which is only 60% of that of steel. The density of pure titanium is close to that of ordinary steel. Some high-strength titanium alloys exceed the strength of many alloy structural steels. Therefore, the specific strength (strength/density) of titanium alloy is far greater than that of other metal structural materials, as shown in Table 7-1. Parts with high unit strength, good rigidity and light weight can be made. The engine components, framework, skin, fasteners and landing gear of the aircraft are made of titanium alloy.

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