As a raw material element for the production of titanium screws, titanium is a very active metal, compared with traditional stainless steel, titanium screws are more flexible and oxidation resistance.
Titanium fasteners in various industries are more widely used, ordinary stainless steel screws in a high-pressure environment compared with titanium screws, titanium screws are more resistant to pressure, so in the aerospace metal, will choose titanium alloy to produce, titanium screws as one of the connections.
Titanium screws, titanium fasteners have the following advantages.
1, low density, high specific strength: the density of titanium metal is 4.51g/cm3, higher than aluminum and lower than steel, copper, nickel, but the specific strength is located in the top of the metal.
2, corrosion resistance: titanium is a very active metal, its equilibrium potential is very low, in the medium of thermodynamic corrosion tendency. But in fact titanium in many media is very stable, such as titanium in oxidizing, neutral and weak reducing media is resistant to corrosion.
3, good heat resistance: the new titanium alloy can be used for a long time at 600 ℃ or higher.
4, good resistance to low temperature performance: titanium alloy TA7 (Ti-5Al-2.5Sn), TC4 (Ti-6Al-4V) and Ti-2.5Zr-1.5Mo, etc. as a representative of low-temperature titanium alloy, its strength increases with the decrease in temperature, but the plasticity change is not large. In -196-253 ℃ low temperature to maintain good ductility and toughness, to avoid metal cold brittleness, is the ideal material for low temperature containers, storage tanks and other equipment.
5, strong damping resistance: titanium metal by mechanical vibration, electrical vibration, compared with steel, copper metal, its own vibration decay time is long.
6, non-magnetic, non-toxic: titanium is a non-magnetic metal, in a large magnetic field will not be magnetised, non-toxic and with human tissue and blood have a good compatibility, so the medical community used.
7, tensile strength is close to its yield strength: this property of titanium illustrates its high yield strength ratio (tensile strength/yield strength), which indicates the poor plastic deformation of titanium metal materials during forming. As the yield limit of titanium and the modulus of elasticity ratio is large, so that titanium forming when the rebound ability is large.
8, good heat transfer performance: titanium metal thermal conductivity than carbon steel and copper, although low, but because of titanium's excellent corrosion resistance, so the wall thickness can be greatly reduced, and the surface and steam heat transfer mode for the drop condensation, reducing the heat group, too the surface does not scale can also reduce the thermal resistance, so that the heat transfer performance of titanium significantly improved.
9, low modulus of elasticity: titanium's modulus of elasticity at room temperature is 106.4 high standard a, 57% of steel.
10, gas absorption performance: titanium screw is a chemically very active metal, at high temperatures can react with many elements and compounds. Titanium gas absorption mainly refers to the reaction with carbon, hydrogen, nitrogen and oxygen at high temperatures.
