Titanium alloys at low and ultra-low temperature, retains its mechanical properties

Titanium alloys at low and ultra-low temperature, retains its mechanical properties. Low temperature performance, low interstitial elements of titanium alloys, as TA7, at -253 ℃ still maintain a certain plasticity. Thus, low-temperature titanium alloy is also an important structural materials.
Chemical activity of titanium is large, a strong chemical reaction with atmospheric O, N, H, CO, CO2, water vapor, ammonia and the like. Carbon content greater than 0.2%, it will form a hard TiC in the titanium alloy; at higher temperatures, and also the role of N forms TiN hard surface; at above 600 ℃, the high hardness of hardened layer is formed of titanium absorbs oxygen ; hydrogen content increased, brittle layer will form. Absorbing gas produced brittle surface to a depth of 0.1 ~ 0.15 mm, the degree of hardening of 20% to 30%. Chemical affinity of titanium is also large, easy and sticking friction surface.
Small thermal elasticity
Thermal conductivity of titanium λ = 15.24W / (mK) approximately 1/4 of nickel, iron 1/5, 1/14 aluminum, while the thermal conductivity of various titanium alloys decreased by 50% than the thermal conductivity of titanium. Elastic modulus was about 1/2 of the titanium alloy for steel, so the poor rigidity, deformation, and should not be made thin-walled elongated rod member, the machined surface when cutting a large amount of spring back, the stainless steel is about 2 to 3 times, causing severe tool flank friction, adhesion, adhesive wear.

Titanium and titanium jewelry products radiation

Titanium and titanium jewelry products radiation
Titanium and titanium alloys alloys as a rare metal, with a small proportion, high strength, high temperature resistance, corrosion resistance, high-quality corrosion lightweight structural materials, new functional materials and important biological engineering materials, mainly for the aerospace industry, chemical industry and the energy industry and other sectors.
There is a metal jewelry, can prevent radiation, can adjust the "three high", also can relieve fatigue, is a "small but perfectly formed." At present, some hit TV shopping product program, online, or even in front of some mall counters, marketers will recommend this kind of "magic" of titanium jewelry products, or necklace or bracelet, For a time, the magic of titanium jewelry for some consumers wide attention.
However, titanium jewelry, medical experts believe that the magic of titanium is not magic, its "magic" purely Bluff, consumers should keep their eyes open, to prevent fooled.
Titanium is not radiation protection;
Titanium is an important alloy steel and alloy elements, the density of titanium welding wire is 4.506-4.516 g / cm (20 ℃), higher than that of aluminum and less than iron, copper and nickel. However, at the head of the metal strength. Melting point of 1668 ± 4 ℃, latent heat of fusion 3.7-5.0 kcal / g-atom, the boiling point of 3260 ± 20 ℃, latent heat of vaporization 102.5-112.5 kcal / g-atom, the critical temperature of 4350 ℃, the critical pressure of 1130 atm. Thermal and electrical conductivity properties of titanium is poor, similar or slightly lower than stainless steel, titanium superconducting, titanium superconducting critical temperature 0.38-0.4K. At 25 ℃, the heat capacity of titanium is 0.126 cal / gram atom · degree, enthalpy 1149 cal / g-atom, the entropy of 7.33 cal / g atom · degree, titanium is paramagnetic, permeability of 1.00004.
In a TV shopping program, a Korean designer titanium bracelet played such a slogan: modern high-tech products generally easy because while passively suffer because of the convenience brought about by the many side effects of radiation