Technical Topics-第21页-Changsha Langfeng Metallic Material Co., Ltd.

TM52 TiC steel bonded carbide rods／plates characteristics and scope of application
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Thermal spraying technology development and application
Thermal spraying technology development and application With the continuous progress of science and technology,some other coating manufacturing technologies such as magnetron sputtering,chemical vapor deposition, physical vapor deposition,laser spraying has also made considerable progress,with these technologies to produce coatings in certain properties.Has been more than the thermal spray coating.Therefore,to maintain the vitality of thermal spraying technology, we must strengthen the basic research on thermal spraying technology, the development of new spraying methods and applications.Now foreign research in this area has made great progress,and our development work is progressing little, thermal spraying technology basically stay in the original level, but also limits the application of coating expansion.Therefore,strengthening the basic research,the development of new applications is our future to do the main work,but also the life of thermal spraying technology. For more information please link: www.langfengmaterials.com,please contact us: sales@langfengmaterials.com
Research Status of Ceramic Coatings
Research Status of Ceramic Coatings Thermal spray ceramic powder, including oxides, carbides, borides, nitrides and silicides, are metal and non-metallic elements of the crystal or amorphous compounds. Ceramic coating with high melting point, high hardness and good wear resistance, corrosion resistance and high temperature stability and so on. However, the coating ceramic coating process is complex, high cost, and the coating surface prone to crack, thermal fatigue performance as metal coating; and coating toughness is poor, can not be used to withstand greater impact load. At present, the commonly used ceramic coatings are A12O3, TiO2, Cr2O3, ZrO2, WC, TiC, Cr3C2, TiB2, etc., generally prepared by plasma spraying, flame spraying, HVOF and explosive spraying technology. Jing Ri et al. [17] studied the sliding friction and wear properties of plasma sprayed A12O3-40% TiO2 and Cr2O3 ceramic powder coatings. It was pointed out that the wear resistance of Cr2O3 coating was higher than that of A12O3-40% TiO2 coating and the wear of Cr2O3 coating The mechanism is mainly abrasive wear, under a large load, Cr2O3 coating wear brittle fracture characteristics. The wear mechanism of A12O3-40% TiO2 coating is mainly plastic deformation and layered peeling. Chen et al [18] studied A12O3 plus TiO2 plus...
High-speed gas spraying technology process characteristics
High-speed gas spraying technology process characteristics The gas velocity at the time of high-speed gas spraying reported in the reference is 1370 to 2930 m / s. Corresponding to the spray particle flying speed of 480 ~ 1020m / s. The typical temperature of the high-speed gas flame flow depends on the type of fuel and the reaction conditions, between 1650 and 2760 ° C. This is almost 10,000 ℃ lower than the temperature at which the plasma is sprayed. Due to the high combustion chamber pressure and the longer nozzle length, the particles can be well accelerated in the flame flow with effective heat exchange. However, spraying particles is still difficult to heat to the extent of full melting, and will not overheat. And the speed is very high, there is a lot of momentum particles in the impact of the substrate surface will occur enough deformation, so that the coating is very dense, combined with reliable, small dispersion of oxides. The heating time of the particles depends on the length of the nozzle. Depending on the gun structure, the type of spray material, and the particle size distribution, the nozzle length is usually between 75 and 305 mm....
The advantages of superhard material turning
8, tool inventory costs lower. In the case of Superhard turning is a practical technology that can provide good economic benefits and better quality of the workpiece, especially in the high dynamic rigid machine tool on the economic benefits are more obvious. Super-caring process and the general turning process is not much difference, the vast majority of manufacturers can introduce this new technology, and applied to the actual production. Looking ahead, with the continuous improvement of cutting technology and machine performance, super-hard turning this new technology will gradually become perfect, get more widely used.
Introduction to Thermal Spraying Technology
Introduction to Thermal Spraying Technology Overview Thermal spraying is a repair and pre-protection technology, with the development and improvement of modern technology, industrial production equipment and mechanical components of the performance requirements are getting higher and higher. The whole casting or forging more expensive metals, such as titanium, nickel, cobalt, tungsten, zirconium, and other high cost and casting, forging and welding methods have some difficulties, so the common material in the work surface, spray a layer of special coating Layer, to achieve: anti-corrosion, wear, anti-wear, anti-high temperature, anti-oxidation, insulation, insulation, conductive, anti-microwave radiation and a series of various functions, to achieve energy conservation, energy conservation purposes. The definition of thermal spraying refers to the use of oxygen – acetylene flame, arc, plasma arc, explosion waves to provide different heat source of the spraying device, resulting in high temperature and high pressure flame or supersonic flame flow, will be made of coating materials such as various metals, ceramics , Metal-ceramic composite materials, solid-state spray materials of various plastic powders, instantaneous heating to plastic or molten state, high-speed spraying to pretreatment (clean rough) parts of the surface of a surface coating method. We put a special work surface called "coating", the manufacturing...

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