Progress Titanium

Progress Titanium

   In recent years, countries are developing a new type of low-cost and high-performance titanium, titanium alloy into the civilian efforts to make positive industry has huge market potential. New progress of titanium alloy is mainly reflected in the following aspects.
(1) high temperature titanium alloy
   Successfully developed the world's first high-temperature titanium alloy is Ti-6Al-4V, using a temperature of 300-350 ℃. Then have developed a use temperature of 400 ℃ of IMI550, BT3-1 and other alloys, as well as the use of a temperature of 450 ~ 500 ℃ of IMI679, IMI685, Ti-6246, Ti-6242 alloy. Has been successfully used in military and civil aircraft engines in the new high-temperature titanium alloys have British IMI829, IMI834 alloys; United States of Ti-1100 alloy; Russia BT18Y, BT36 alloy. Table 7 as part of the country's new high-temperature titanium alloy maximum operating temperature [26].
In recent years, the use of foreign fast solidification / powder metallurgy technology, fiber or particle-reinforced composites developed high temperature titanium alloy as the development direction, so that the use of temperature titanium alloy can be increased to more than 650 ℃ [1'27'29'31 ]. American McDonnell Douglas by rapid solidification / powder metallurgy technology Qi successfully developed a high-purity, high-density alloy at 760 ℃ its strength equivalent to the strength of the current room temperature titanium alloy used in .
   (2) titanium-based alloy aluminum compounds.
   Compared with the general titanium, titanium-aluminum-based compound sodium Ti3Al (α2) and TiAl (γ) intermetallic compounds biggest advantage is a good temperature performance (maximum operating temperatures of 816 and 982 ℃), strong antioxidant, anti-good creep resistance and light weight (density of only 1/2 of a nickel-base superalloy), these advantages make it the aero-engine and aircraft structural parts of the most competitive materials in the future.
   (3) resistant titanium alloy. Conventional titanium alloys have a tendency to burn alkoxy under specific conditions, which limits its application to a large extent. In view of this situation, countries have launched a study of flame titanium and made some breakthroughs. Qiang country developed the Alloy c (also known as Ti-1720), the nominal composition of 50Ti-35v-15Cr (mass fraction), is a kind of continuous burning insensitive resistant titanium alloy, have been used in the F119. BTT-1 and BTT-3 for the Russian developed resistant titanium alloy, both Ti-Cu-Al alloy, has a very good thermal deformation process performance, which is made available for complex parts [26].
   (4) medical titanium.
   Titanium non-toxic, high light, strength and excellent biocompatibility, is ideal for medical metallic material, used as human implants implanted and so on. Currently, in the medical field is still widely used Ti-6Al-4v ELI alloy. But the latter will precipitate a very small amount of vanadium and aluminum ions, reducing its cellular adaptation and possibly cause harm to humans, this issue has caused widespread concern in the medical profession. Qiang States early in the 20th century the mid-1980s began to develop non-aluminum, vanadium-free, biocompatible titanium, which is used to orthopedic surgery. Japan, the United Kingdom also done a lot of research work, and made some new progress.