Properties and Applications of Titanium diboride(TiB2)
Titanium diboride(TiB2) is a new type of ceramic material, has extremely excellent physical and chemical properties.Such as high melting point and hardness, excellent chemical stability, excellent conductive thermal conductivity and excellent mechanical properties under high temperature. TiB2 and their composite materials are widely used in aerospace, automotive, military, machinery, oil, mining, metallurgy, chemical industry, nonferrous metals and electronic electrician, etc.
TiB2 produced by carbon thermal method, the cost is low, but get a lower purity and big grain, which not wildly go to commercial applications, and grinding process will inevitably have a hook or carbide carbide drill pollution. In addition, compared with the SHS process, low carbon hot method has a low reaction temperature, which will causes a new pollution when left over from the carbon element. The titanium carbide deposition in the reaction process in grain boundary will seriously affect the material properties. Method of carbon heat production of TiB2 is not easy to molding, and have to add other materials to help sintering. And these materials are usually easy to oxidation and get harmful impurities, which influence the quality of the products. So people often inert gas or vacuum protection device, which lead to high costs. The SHS production of TiB2, can get an average particle size distribution in 0.1 to 1.0 microns, and an average particle size of 0.5 microns. This leads to the effect of surface area is much larger than other traditional materials.
The theory density of TiB2 is 4. 52 g/cm3, the molecular weight of 69.54, with a hexagonal structure with TiB2 By 31. 12% and 68.88% of Ti, gray or black powder synthesis by color, sintering molding parts are metal gray.
TiB2 has a good conductive and heat conduction performance, its resistivity at room temperature is 15 x10 - 6ohm-cm, with similar conductivity of pure iron and Platinum. Its thermal conductivity is 25 w/m 'K, it can be as high as 3253 ℃ melting point.
TiB2 also has excellent chemical stability, its antioxidant temperature can reach 1100 ℃, and remained stable in HNO3 and HF, but will be alkali decomposition, TiB2 can react with hot H2SO4, and fusible in HNO3, + H2O2 solution.
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SEM of nano Titanium diboride
TiB2 produced by carbon thermal method, the cost is low, but get a lower purity and big grain, which not wildly go to commercial applications, and grinding process will inevitably have a hook or carbide carbide drill pollution. In addition, compared with the SHS process, low carbon hot method has a low reaction temperature, which will causes a new pollution when left over from the carbon element. The titanium carbide deposition in the reaction process in grain boundary will seriously affect the material properties. Method of carbon heat production of TiB2 is not easy to molding, and have to add other materials to help sintering. And these materials are usually easy to oxidation and get harmful impurities, which influence the quality of the products. So people often inert gas or vacuum protection device, which lead to high costs. The SHS production of TiB2, can get an average particle size distribution in 0.1 to 1.0 microns, and an average particle size of 0.5 microns. This leads to the effect of surface area is much larger than other traditional materials.
The theory density of TiB2 is 4. 52 g/cm3, the molecular weight of 69.54, with a hexagonal structure with TiB2 By 31. 12% and 68.88% of Ti, gray or black powder synthesis by color, sintering molding parts are metal gray.
TiB2 has a good conductive and heat conduction performance, its resistivity at room temperature is 15 x10 - 6ohm-cm, with similar conductivity of pure iron and Platinum. Its thermal conductivity is 25 w/m 'K, it can be as high as 3253 ℃ melting point.
TiB2 also has excellent chemical stability, its antioxidant temperature can reach 1100 ℃, and remained stable in HNO3 and HF, but will be alkali decomposition, TiB2 can react with hot H2SO4, and fusible in HNO3, + H2O2 solution.
SEM of nano Titanium diboride
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