2011-08-10 08:49:54 - This paper describes the high performance of titanium alloys, including corrosion resistance, heat resistance, low temperature performance, anti-damping properties, magnetic properties, tensile strength, yield strength, heat transfer, elastic modulus, suction performance, etc.

1. Low density, high specific strength
Titanium density is 4.51g/cm3, above aluminum and below steel, copper, nickel, but the strength is the first in the metal.
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2, corrosion resistance
Titanium is a very reactive metal, and its equilibrium potential is very low, big tendency of large corrosion in the medium of the thermodynamic. But in fact titanium is very stable in many media, such as titanium in oxidizing, neutral and weak reducing other media is resistant to corrosion. This is because the titanium and oxygen have a great affinity, in the medium of air or oxygen, titanium generate an oxide film of dense, strong adhesion, large inert to protect the titanium substrate from corrosion. Even

if due to mechanical wear, it will soon heal or regenerate. This shows that titanium is a metal with strong tendency to passivation. The titanium oxide film has always maintained this characteristic under the medium temperature of 315 ℃
In order to improve the corrosion resistance of titanium, oxidation, electroplating, plasma spray, ion nitriding, ion implantation and laser processing, surface treatment technology are developed to protect titanium oxide film, and get a desired corrosion resistance effect. For the requirement of metal material in manufacturing of sulfuric acid, hydrochloric acid, methylamine solution, high temperature hot wet chlorine and chloride, titanium - molybdenum, titanium - palladium, titanium - molybdenum - a series of corrosion resistant nickel-titanium alloy are developed. 32 Titanium casting using titanium-32 molybdenum alloy, titanium -0.3 -0.8 molybdenum-nickel alloy is use for environment of occurrence of crevice corrosion or pitting, and titanium -0.2 palladium alloy is for part of titanium equipment, both get very good use effect
3. Heat resistance
New titanium alloy can be long term use at 600 ℃ or higher temperature.
4. Low temperature performance
Low temperature Titanium alloy represented by TA7 (Ti-5Al-2.5Sn), TC4 (Ti-6Al-4V) and Ti-2.5Zr-1.5Mo, its intensity increased with decreasing temperature, but the plastic does not change large. Maintain good ductility and toughness at -196-253 ℃ low temperature, can avoid the metal cold brittleness, and is ideal material for low temperature containers, tanks and other equipment.
5. Strong anti-damping
The vibration attenuation is the longest when vibrated by mechanical vibration, electrical vibration, and steel, copper metal. With this property, titanium can be used for performance tuning fork, medical Ultrasonic vibration mill components and advanced audio speaker vibration film, etc.
6. Non-magnetic, non-toxic
Titanium is non-magnetic metal, and will not be magnetized in a large magnetic field. It is non-toxic and has good compatibility with human tissue and blood, so the it is used by medical profession
7. Tensile strength close to its yield strength
This performance of titanium shows its yield ratio (tensile strength / yield strength) is high, that the titanium material is not good in the forming of plastic deformation. Due to the big ratio of yield limit and elastic modulus, the resilience of forming titanium is large.
8. Good Heat transfer performance
Although the thermal conductivity of titanium is lower than carbon steel and copper, but because of excellent corrosion resistance of titanium, so the wall thickness can be greatly thinned, and the heat transfer way of surface and steam is drop condensation, which reduce the heat group, and thermal resistance, and make the heat transfer performance of titanium significantly improved.
9. Low elastic modulus
Titanium elastic modulus at room temperature is 106.4GMPa, 57% for the steel.
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10. Suction performance
Titanium is a metal of very active chemical properties. At high temperatures, it can cause effect with many elements and compounds. Titanium suction mainly refers to react with carbon, hydrogen, nitrogen, oxygen under high temperature。
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