Technical Topics-第9页-Changsha Langfeng Metallic Material Co., Ltd.

High Manganese Steel
High Manganese Steel The wear resistance of high manganese steel rods is mainly manifested in its work hardening ability,adding TiC-based cemented carbide, reducing the stability of austenite, forming a large number of tiny second phase particles on the substrate, preventing dislocation movement, thus Strengthen the matrix, so that it has high toughness, high strength and good wear resistance. For more information please link: www.langfengmaterials.com,please contact us: sales@langfengmaterials.com
Necessity of long-term preservation of steel structure engineering application
Necessity of long-term preservation of steel structure engineering application So far, the corrosion of steel structures is causing huge losses to the national economies of various countries in the world. According to statistics from some industrialized countries, the annual economic losses due to the corrosion of steel structures account for about 2% to 4% of the GNP. The U.S. economic loss due to corrosion in 1975 was about 70 billion U.S. dollars, accounting for 4.2% of the GNP of that year and up to 126 billion U.S. dollars in 1982. The British had a corrosion loss of 1.365 billion pounds in 1969, accounting for 3.5% of the GNP %. In 1976, Japan's corrosion loss was 9.2 billion U.S. dollars, accounting for 1.8% of the GNP. According to China's statistics in 1995, the corrosion loss was as high as 150 billion yuan, accounting for about 4% of the GNP. At present, the annual economic losses caused by the corrosion of steel structures in the world have reached hundreds of billions of dollars or more. Moreover, accidents caused by corrosion of steel structures endanger the safe operation of the structure. Corrosion caused by catastrophic accidents are common, the consequences are extremely serious,...
Metal powder flame spraying process
6) The bonding strength of the sprayed layer and the substrate: The tensile strength of the conventional flame sprayed coating is generally 20-30N / mm2. The ZK8032 powder multifunctional high speed flame spraying gun newly developed and manufactured by Shaanxi Zhongke Surface Engineering Co., The cast iron is sprayed on the sandblasting surface and sprayed on the aluminum clad nickel composite coating, the shear bond strength of the coating can reach 63.7N / mm2. Although the sprayed coating is not as strong as the bonding strength of the sprayed coating, After the failure of parts is sufficient to meet the needs.After calculation of scientific research units, in the liberation of CA141 car full load operation, the shear stress on the crankshaft seven main journals focus on a main journal only 15N / mm2; Dongfanghong 75 tractors Only 5.5N / mm2, these data is far below the shear strength of the spray coating.
Metallic carbide powders used for tungsten carbide cutting tools
Multi-carbide cutting tools, including tungsten carbide with other carbides, especially titanium carbide and/ or tantalum carbide, permit the high-speed machining of steel. The hardness of this carbide is greater than that of most other tool materials at room temperature and it has the ability to retain it harness at elevated temperatures, making very high-speed machining possible.The more common alloying additions to he basic tungsten/cobalt are tantalum carbide and titanium carbide.For high-temperature operations, WC+TiC or TaC grades are used to improve wear resistnace. Alloying with Tantalum carbide and titanium carbide has distinct advantages. Titanium carbide reduces cratering of the tool significantly while tantalum carbide increases the hot hardness of the tool. Among the carbides, titanium carbide is not prone to brittleness unlike tungsten carbide.
Application of Nanometer Zirconium Carbide
Nano-zirconium carbide used in the new thermostat thermostat textiles, zirconium carbide has a highly efficient absorption of visible light reflected infrared characteristics. When it absorbs 95% of the short wavelength energy of 2 μm or less in sunlight, energy is stored in the material by thermal conversion. It also has a characteristic of reflecting infrared wavelengths exceeding 2 m. The human body produces infrared wavelengths of about 10μm or so, when people wear with nano-zirconia textile clothing, the human body will not be easily distributed out of infrared. This shows that zirconium carbide has the ideal endothermic, heat storage characteristics, can be applied to the new thermostat thermostat textiles.
The definition and technical function of thermal spraying method
Thermal spraying technology began in the early of this century. At first, it was just the molten metal flow with compressed air, the coating of the surface of the substrate to be printed, forming a layer of membrane tissue. The spraying temperature and drop on the impact velocity and form a coating on the surface of the substrate material performance constitutes the core of spraying technology. The whole development of thermal spraying technology, is basically along the three leading line to move forward. Temperature and speed depends on different heat source and the equipment structure. In a sense, the higher the temperature, the faster the speed, the more excellent coating formation, resulting in the temperature and velocity of two elements in the whole technology in the development of the situation of competition and coordination. Selectivity of various coating materials, is another advantage of the thermal spraying index, it can make different equipment of working face was "DianTieChengJin, wear a helmet to wear armour". Is the three elements, making the thermal spraying truly overlay with unique technology, it can be designed for the various properties of the surface, obtained from the general mechanical maintenance, until the shuttle and biological engineering in...

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