There are many kinds of ceramics. Modern engineering ceramic materials mainly include alumina, oxidized bell, silicon carbide, silicon nitride and their toughening reinforced composite materials. The highest hardness of ceramics can reach above HRA95, and the toughness is close to that of ordinary cast iron. The erosion resistance is several times and several times higher than that of high chromium cast iron. The excellent wear resistance of ceramics can be used in almost any wear condition. At present, the biggest obstacle to the widespread use of ceramic materials as engineering materials is how to maintain high toughness and economy under the premise of maintaining high hardness and high wear resistance, which is one of the goals in the field of engineering ceramics research. Alumina ceramics have good wear resistance, low cost and moderate toughness, and are widely used as a wear resistant material. In the power industry, the wear-resistant ceramic sheet is applied to various pulverized coal processing equipment, including fan impeller, casing, coarse and fine powder separator, flue and pulverized coal pipeline, and the service life is increased several times to several times. More than ten times, it provides an important means for the wear and wear prevention measures of the power industry. Silicon carbide and silicon nitride materials are also used in the same application. In the civilian sector, ceramic faucets have become one of the important book aquatic products that have emerged in recent years. Toughening and strengthening ceramic materials are mainly made by refining ceramic particles, adding various high-strength fibers, whiskers and sintering in high temperature and high pressure processes, mainly used in ceramic tools. The cutting performance of ceramic tools is several times and several times higher than that of cemented carbide.
In the process of water pump manufacturing, due to the use of ceramic tools, high chromium cast iron can be directly processed, eliminating the need for annealing and quenching processes, greatly reducing production costs. The goal of engineering ceramics research and development is to improve toughness and processing performance while reducing costs while maintaining high strength, high hardness and high wear resistance. The rise of nanotechnology will provide a good prospect for the development of engineering ceramics. The service life is sometimes only a few months or even ten days. The fan casing is also very worn and the wear-resistant lining of 20mm is only a few months old. The life of some components of the pulverized coal system and the ash removal system is only ten days. Although surface heat treatment, spraying, surfacing and coating wear-resistant coatings have been adopted. The results are not very satisfactory. For many years, in order to solve the serious wear problem of thermal power generation equipment, I tried to use ceramic materials. The ceramic-metal composite technology was developed, and the ceramics were laminated on the metal substrate by using the pasting and inlaying process, which provided an effective means for the wear-resistant wear-prevention of the thermal power generation industry. In particular, the patented technology developed makes the combination of ceramic and metal safer and more reliable, and the use temperature is higher. The scope of application is wider, and the application range is not limited to the thermal power industry, but also applied in the mining, chemical and petroleum industries.
Here are a few typical applications. (l) The power plant powder discharge machine is mainly used to transport coal powder, and the wear is very serious. The impeller of the powder discharge machine of a power plant in Henan Province is made of 16Mn material, and the average service life is only 3 months. The surfacing, spraying and other processes are used repeatedly, and the effects are not satisfactory. Even using the most wear-resistant ceramic wear-resistant coatings in the United States, the service life has not been significantly improved. After using ceramic-metal composite technology, a ceramic sheet with a thickness of only 1.5 mm is composited on the surface of the blade. After 2 years of use, no obvious wear phenomenon has been found. At present, all the impellers of the plant have used this technology, and the average life is improved. More than 3 years. (2) The induced draft fan impeller of the thermal power plant is used to transport dusty flue gas, and the wear is more serious. The impeller of a power plant in North China uses a cemented carbide spray welding process. The surface hardness reaches above HRC6o and the service life is only half a year. The surface of the blade is compounded with 1.5mm ceramics, which lasts for 2 years and has an average wear of less than 0.3mm. The service life of the fan impeller in a power plant in Henan is 3 months, and the wear life of the shell is two months. The impeller is compounded with a 6 mm thick ceramic piece by insert welding, and the shell is compounded with a 1.5 mm ceramic piece, and the base metal surface is not worn for 3 years.
High Frequency Pipe Welding Machine is a equipment which belongs to cold roll forming, also belongs to high frequency hot welding forming. The high frequency is same with other roll-formed profiles machines, de-coiling, leveling, cold roll forming, while the High Frequency Welding Machine is welded by high frequency after it is formed by the stations of rollers. high frequency pipe welding machine can produce different shapes of tubes or pipe by changing the mold, in a word, one high frequency pipe welding machine can produce the square tube, the round tube, the rectangular tube.
High Frequency Pipe Welding Machine
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