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Titanium Flange Performance
Jun 09, 2017

Titanium Flange performance
Titanium is a new type of metal, titanium performance and carbon, nitrogen, hydrogen, oxygen and other impurities related to the most pure titanium iodide impurity content of not more than 0.1%, but its low strength, high plasticity. 99.5% of industrial pure titanium performance: density ρ = 4.5g / cm3, melting point of 1725 ℃, thermal conductivity λ = 15.24W / (mK), tensile strength σb = 539MPa, elongation δ = 25% Rate ψ = 25%, elastic modulus E = 1.078 × 105MPa, hardness HB195.
(1) the strength of high-Titanium Flange density is generally 4.5g / cm3 or so, only 60% of steel, pure titanium strength is close to the strength of ordinary steel, some high-strength Titanium Flange more than a lot of alloy structure Steel strength. So the Titanium Flange strength (strength / density) is much larger than other metal structure materials, see Table 7-1, can produce a unit of high strength, good rigidity, light weight zero parts. At present the aircraft engine components, skeleton, skin, fasteners and landing gear and so on are using Titanium Flange. The following are the same as the "
(2) high thermal strength of the use of aluminum than aluminum several degrees higher than the medium temperature can still maintain the required strength, can be 450 ~ 500 ℃ temperature long-term work These two types of Titanium Flange at 150 ℃ ~ 500 ℃ range is still a high specific strength, while the aluminum alloy at 150 ℃ when the specific strength decreased significantly. Titanium Flange operating temperature up to 500 ℃, aluminum alloy at 200 ℃ below.
(3) corrosion resistance Titanium Flange in the humid atmosphere and sea water medium work, its corrosion resistance is much better than stainless steel; pitting, acid corrosion, stress corrosion resistance is particularly strong; alkali, chloride , Chlorine organic products, nitric acid, sulfuric acid, etc. have excellent corrosion resistance. But the titanium has a reducing oxygen and chromium salt medium corrosion resistance is poor.
(4) low-temperature performance Titanium Flange at low temperature and ultra-low temperature, can still maintain its mechanical properties. Low temperature performance, very low gap element Titanium Flange, such as TA7, at -253 ℃ can maintain a certain degree of plasticity. Therefore, the Titanium Flange is also an important low-temperature structural materials.
(5) chemical activity of large titanium chemical activity, and the atmosphere O, N, H, CO, CO2, water vapor, ammonia and other strong chemical reaction. When the carbon content is more than 0.2%, it will form hard TiC in the Titanium Flange. When the temperature is high, the TiN hard surface will be formed by N. When the temperature is above 600 ℃, the titanium absorbs oxygen to form a high hardness Hardened layer; hydrogen content increases, will also form a brittle layer. Absorb the gas and the hard and brittle surface depth of up to 0.1 ~ 0.15 mm, hardening degree of 20% to 30%. Titanium chemical affinity is also large, easy to produce adhesion with the friction surface.
(6) thermal conductivity is small, the elastic modulus of small titanium thermal conductivity λ = 15.24W / (mK) about nickel 1/4, iron 1/5, aluminum 1/14, and a variety of Titanium Flange Of the thermal conductivity than the thermal conductivity of titanium decreased by about 50%. Titanium Flange elastic modulus of about 1/2 of the steel, so the rigidity is poor, easy to deformation, should not make slender rod and thin-walled pieces, cutting the surface of the processing of a large amount of rebound, about stainless steel 2 ~ 3 times, causing the tool flank sharp friction, adhesion, bonding wear.