Boron Carbide (chemical formula approximately B4C) is an extremely hard boron–carbon ceramic and covalent material used in tank armor, bulletproof vests, engine sabotage powders,as well as numerous industrial applications. With a Vickers hardness of >30 GPa, Boron Carbide Abrasive Powder is one of the hardest known materials, behind cubic Boron Nitride and diamond.
Boron Carbide Powder was discovered in the 19th century as a by-product of reactions involving metal borides, but its chemical formula was unknown. Boron Carbide Applications Boron Product was not until the 1930s that the chemical composition was estimated as B4C.Controversy Boron Carbide Buy remained as to whether or not the material had this exact 4:1 stoichiometry, as, in practice the material is always slightly Titanium Dioxide carbon-deficient with regard to this formula, and X-ray crystallography shows that its structure is highly complex, with a mixture of C-B-C chains and B12 icosahedra.
These features argued against a Pvc Resin very simple exact B4C empirical formula.Because of the B12 structural unit, the chemical formula of "ideal" boron carbide is often written not as B4C, but as B12C3, and the carbon deficiency of boron carbide described in terms of a combination of the B12C3 and B12CBC units.
Boron Carbide Powder,Boron Carbide Applications,Boron Carbide Abrasive Powder,Boron Carbide Buy HENAN LIHAO CHEM PLANT LIMITED , https://www.lihaochemicals.com
Pneumatic three-way valve Introduction, applicable occasions and troubleshooting
Pneumatic three-way ball valve Introduction: As pneumatic three-way ball valve is usually rubber, nylon and PTFE as the seat ring material, so its temperature by the valve seat ring material restrictions. The cut-off effect of the ball valve is achieved by pressing the metal ball against each other under the action of the medium in the plastic valve seat (floating ball valve). Seat ring in a certain amount of contact pressure, elastic deformation occurs in some areas. This deformation can compensate for the ball manufacturing accuracy and surface roughness, to ensure the sealing performance of the ball valve. Since the seat ring of the pneumatic three-way ball valve is usually made of plastic, it is necessary to consider the ball valve's fire-resistance and fire-prevention when selecting the structure and performance of the ball valve, especially in the sectors of petroleum, chemical industry and metallurgy, Explosive media equipment and piping systems used in the ball valve, but should pay attention to fire and fire. Normally, the sealing performance is strictly controlled at two positions, the mud, wear and contraction channels, rapid opening and closing movements (1/4 turn on and off), high pressure cutoff (large pressure drop), low noise, cavitation and gasification, A small amount of leakage to the atmosphere, the operating torque is small, the fluid resistance of small pipe systems, the recommended use of the ball valve. Pneumatic three-way ball valve applications: pneumatic three-way ball valve is also suitable for light structure, low pressure cutoff (small pressure difference), corrosive medium piping system. Ball valves are also available in cryogenic (cryogenic) systems and piping systems. Oxygen piping systems in the metallurgical industry require the use of carefully degreased ball valves. In the oil pipeline and gas pipeline in the main line to be buried in the ground, you need to use full-bore welded ball valve. When required to have regulatory performance, the need to use a special structure with a V-shaped opening ball valve. In petroleum, petrochemical, chemical, power, urban construction, the working temperature of 200 degrees above the pipeline system can choose metal to metal sealed ball valve. Pneumatic three-way ball valve common faults and solutions: Ball valve has long been subject to material erosion, resulting in friction, resulting in severe impact wear and tear, can not meet the normal production, while causing the equipment to shorten the service life. At present more wear-resistant materials for ball valve wear, such as ceramic materials, polymer composites and other methods, the application of more Meijiahua technology system. Polymer materials have excellent adhesion properties, superior wear resistance, safe to solve the shortcomings of metal often wear and tear, to ensure the normal production of business equipment. And the unique ceramic materials and special surface hardening agent in the material make it wear-resistant and anti-physical impact performance better than any steel or even more than ceramic tile in the worst dry-grinding environment. The pneumatic three- And performance is the ideal material to prevent accumulation of coal.