By Dr.Qian from Guizhou University of Finance and Eco | 16 July 2020 | 0 Comments
Advanced Technology of Synthesis and Preparation of tungsten boride
The definition and and properties of tungsten boride
Tungsten boride is a compound composed of tungsten and boride, which is a kind of extremely hard material. The WB and WB2 crystals have a Vickers hardness of 20 GPa. The tungsten diboride usually appears in the form of black powder, whose physical properties are as follows: its’ molecular formula is BW2; its’ molecular weight is 378.49; its density is 1.6 g/ml; its’ melting point is 2670°C; it is metal conductive and its is soluble in aqua regia.
Synthesis and preparation
1.Adopt solid phase method. Use tungsten and boron as raw materials and thoroughly mix and grind the two kinds of materials. Then when the reaction is heated at 1400°C or even higher, tungsten boride can be obtained. And then, let the reaction continue so that it could form W2B, waiting it to be cooled and pulverized so as to obtain a product.
2. Tungsten and stoichiometric boron powder are mixed according to the mole ratio of mixed W: B = 2:1, in a vacuum or argon atmosphere at 1200 ~ 1300 ℃ sintering, then a boron HuaEr tungsten can be obtained.
3. The single crystal can be obtained by a method of melting the region.
Preparation of tungsten boride ceramics by pressure - free sintering
1.Solid phase synthesis method was used to prepare tungsten boride powder. When the molar ratio of B/W was 2.5, WB2 powder with high purity could be obtained. WB4 phase appears in the product as the molar ratio of B/W increases.
2.Sintering temperature has a great influence to the sintering behavior of WB2, when the sintering temperature is 1800 ℃, WB2 ceramics can be obtained at a rate of 5.2% porosity and with the relative density of 86.0% .
3.With the increase of sintering temperature, the bending strength and hardness of WB2 material are significantly improved, and the fracture behavior of WB2 ceramics changes from intergranular fracture to transgranular fracture.
Applications
BW2 is commonly used for wear-resistant coatings and semiconductor films for wear parts.
TRUNNANO (Luoyang Trunnano Tech Co., Ltd ) is a professional Tungsten boride manufacturer with over 12 years experience in chemical products research and development. If you are looking for high quality Tungsten boride, please feel free to contact us and send an inquiry.
Tungsten boride is a compound composed of tungsten and boride, which is a kind of extremely hard material. The WB and WB2 crystals have a Vickers hardness of 20 GPa. The tungsten diboride usually appears in the form of black powder, whose physical properties are as follows: its’ molecular formula is BW2; its’ molecular weight is 378.49; its density is 1.6 g/ml; its’ melting point is 2670°C; it is metal conductive and its is soluble in aqua regia.
1.Adopt solid phase method. Use tungsten and boron as raw materials and thoroughly mix and grind the two kinds of materials. Then when the reaction is heated at 1400°C or even higher, tungsten boride can be obtained. And then, let the reaction continue so that it could form W2B, waiting it to be cooled and pulverized so as to obtain a product.
2. Tungsten and stoichiometric boron powder are mixed according to the mole ratio of mixed W: B = 2:1, in a vacuum or argon atmosphere at 1200 ~ 1300 ℃ sintering, then a boron HuaEr tungsten can be obtained.
3. The single crystal can be obtained by a method of melting the region.
1.Solid phase synthesis method was used to prepare tungsten boride powder. When the molar ratio of B/W was 2.5, WB2 powder with high purity could be obtained. WB4 phase appears in the product as the molar ratio of B/W increases.
2.Sintering temperature has a great influence to the sintering behavior of WB2, when the sintering temperature is 1800 ℃, WB2 ceramics can be obtained at a rate of 5.2% porosity and with the relative density of 86.0% .
3.With the increase of sintering temperature, the bending strength and hardness of WB2 material are significantly improved, and the fracture behavior of WB2 ceramics changes from intergranular fracture to transgranular fracture.
BW2 is commonly used for wear-resistant coatings and semiconductor films for wear parts.
TRUNNANO (Luoyang Trunnano Tech Co., Ltd ) is a professional Tungsten boride manufacturer with over 12 years experience in chemical products research and development. If you are looking for high quality Tungsten boride, please feel free to contact us and send an inquiry.
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