Industry Insight

Pure Titanium and Titanium Alloy

Titanium materials with a titanium content greater than 99.5% are generally referred to as pure titanium. On the basis of pure titanium, Al, Mo, Cr, Sn and other substances are added to the titanium material produced by a series of processes such as smelting, forging, and rolling, which is called titanium alloy. The density of pure titanium and titanium alloys is between 4.45 g·cm^-3-4.60 g·cm^-3, which is the heaviest light metal.

According to the impurity content, pure titanium is divided into high-purity titanium with a purity of 99.9% and industrial pure titanium with a purity of 99.5%.

Titanium has good press workability and poor cutting performance. Pure titanium has low strength, soft texture, no wear resistance, good plasticity, good low temperature toughness and high corrosion resistance.

Pure titanium has a silvery-white metallic luster. Melting point (1668±10)℃, boiling point 3260℃. The melting point is higher than that of iron and nickel. The thermal conductivity is only 1/6 of iron and 1/16 of aluminum, which is not good for cutting and welding, and the expansion coefficient is 8.36×10^-6℃^-1. Titanium can burn when heated in nitrogen, so titanium is protected by argon during heating and welding.

Pure titanium has extremely high corrosion resistance in most media, especially in neutral, oxidizing and seawater media. The impurities that have the strongest influence on the mechanical properties of pure titanium are oxygen, nitrogen and iron, especially oxygen. A small amount of impurities can significantly improve the strength of titanium, so the strength of industrial pure titanium is higher, close to the level of high-strength aluminum alloys.

Titanium alloy is an alloy composed of other elements based on titanium. Titanium has two isomorphous crystals; titanium is an isomeric isomer with a melting point of 1720°C and a close-packed hexagonal lattice structure below 882°C , called a titanium; above 882 ° C, it has a body-centered cubic lattice structure, called β titanium, using the different characteristics of the above two structures of titanium, adding appropriate alloying elements to make the phase transition temperature and phase content gradually increase Titanium alloys with different structures are obtained by changing them. Titanium alloys greatly improve the strength, mechanical properties, toughness and corrosion resistance, hardness, and wear resistance of titanium materials after adding metal elements.

Carbon Fiber

    Carbon fiber (CF) is a filamentary carbon material, which is a microcrystalline graphite material obtained by carbonization and graphitization of organic fibers. The fiber diameter is 5-10 microns and the carbon content is more than 90%. Due to the optimal orientation of its microcrystalline structure along the fiber axis, it has high strength and elastic modulus along the fiber axis, the strength can reach 5 times that of steel, no creep, the density is 1/5 of that of steel, and it also has fatigue resistance ; Can withstand high temperature above 2000 ℃ in non-oxidizing environment, with small thermal expansion coefficient; has good electrical and thermal conductivity, good electromagnetic shielding, good X-ray transmittance; insoluble in organic solvents, acids and alkalis , non-swelling, with outstanding corrosion resistance.

Carbon fiber not only has the inherent properties of carbon materials, but also has the softness and processability of textile fibers.

The main use of carbon fiber is as a reinforcing material to be compounded with resins, metals, ceramics and carbon to make advanced composites.