China Hunan Yibeinuo New Material Co., Ltd. Company News

Application in cement plant (1) Various hoppers and chutes: the ore crushing system, raw material grinding system, cement grinding system, various chutes, and hoppers have a large daily output workload, high material hardness, and serious equipment and wear problems. Previously, due to the lack of any anti-wear measures, 10mm steel plates were often worn through within a week; 30mm manganese steel liners were worn through within a few months. Frequent wear and tear of equipment not only increases the maintenance burden but also seriously affects the normal operation of the equipment. (2) V-type powder separator breaker plate: It is very effective to use toughened alumina wear-resistant ceramic instead of wear-resistant steel plate for wear resistance. Alumina wear-resistant ceramics can also be wear-resistant ceramic liners with bolts on the back, which not only greatly improves the wear resistance, but also is very convenient to replace. (3) Fan impeller: In the new dry production line, the powder conveying is mainly driven by the fan. The high-speed rotation of the fan causes the relative movement of the dust-laden two-phase airflow and the blades, causing serious wear to the impeller. After using alumina wear-resistant ceramics, the wear resistance is improved and the service life is increased.   Application in power plants The wear of the pulverizing system of thermal power plants is mainly the collision and impact wear of the pulverized coal. Similar to the air duct elbow of the powder separation system of a cement plant, the high-speed pulverized coal airflow at the outlet of the coal mill, the inlet and outlet of the coarse powder separator, and the elbow of the primary air duct are particularly severe. In the pulverizing system, the porcelain steel liner composed of alumina ceramic + steel plate is used, which is convenient to install and more wear-resistant.   As a grinding medium Alumina grinding balls have the characteristics of high hardness, moderate density, wear resistance, corrosion resistance, and low price. Metal impurities are introduced into the metal balls. They are widely used in the grinding and processing of cement, minerals, ceramics, electronic materials, magnetic materials and raw materials in coatings. In the coating industry, it is a high-quality grinding medium. In the architectural ceramics industry, the 20% to 40% efficiency of alumina ball wear is higher than that of natural flint and pebbles. With the reduction of natural ball stone resources of my country's high-quality enterprises and the high wear rate of ordinary ceramic balls, alumina grinding balls will be used by more and more manufacturers.  

Zirconia has excellent properties such as high temperature resistance, corrosion resistance, wear resistance, good thermal stability, high refractive index, and good thermal shock resistance. It is one of the emerging materials that have developed rapidly in recent years. At present, the preparation methods of zirconia mainly include chemical methods and electric melting methods. Among them, the high-purity zirconia produced by the chemical method has particularly excellent performance, and the product is easy to control in the production process. Still, the chemical method has a long process flow and decomposition. The reagent consumption is large and the product cost is high, so it cannot be widely used in the fields of ordinary ceramics, refractory materials, and ceramic color glazes.   The production process of fused zirconia The electrofusion stabilized zirconia process can be divided into two types according to the raw materials: one is to use zircon sand as the raw material, and complete the two processes of desiliconization and stabilization through a single smelting in an electric arc furnace, which is called the one-time smelting method; One is to use electric fusion desiliconized zirconium as the raw material, mixed with stabilizers and smelted in an electric furnace to form stable zirconia, which is called the secondary smelting method.   Application of Fused Zirconia---Application in ceramic color and glaze Ceramic pigments are the most important ceramic decorative materials. Among ceramic pigments, zirconium-based pigments have the characteristics of good color stability, strong color rendering power, good miscibility, and pure color. Therefore, fused zirconia is more and more popular. The more widely used it is in the production of ceramic color glaze. Zirconium-based ceramic pigments mainly include zirconium vanadium blue, zirconium praseodymium yellow, vanadium zirconium yellow, zirconium iron red, zirconium yellow, and other types. In synthesizing zirconium silicate, transition metal, and rare earth metal ions can enter its crystal lattice to form a bright and stable toner.   Application in refractory materials Fused zirconia is a new high-grade refractory material with high melting points, and good chemical and thermal stability. It is widely used in steel production, glass production, non-ferrous precious metal production, engineering ceramics, furnace lining refractories, abrasives, pigments, Electronics production, and other industries, producing products that require high temperature resistance, corrosion resistance, erosion resistance, good chemical stability, low thermal conductivity, high hardness, wear resistance and other excellent properties, such as sizing nozzles, zirconium corundum, zirconium mullite, pipes Nozzles, nozzles, crucibles, ceramic pigments, surface coatings, abrasives, grinding media, engineering ceramics, kiln furniture, etc.   Application in investment casting For fused zirconia, investment casting is also a major dedicated market. Such as the casting of special products such as aerospace engine turbine blades and golf clubs. Zirconium oxide is generally used as the model coating. Zircon is used in investment casting because of its ability to form actual contact with hot metal alloys, thereby protecting the mold from thermal shock.   Application in abrasive materials Polishing tools used in the ceramic industry, such as grinding wheels, and non-metallic blade products used in stone cutting, these products are made by mixing zirconia and alumina according to a certain formula ratio to make coarse abrasive particles, which are processed after thermal processing Grinding wheels or coated on the surface of grinding tools can be used to polish steel and metal alloys.   Application in advanced ceramics and special products For stabilized zirconia, electronic component firing regulating plates are a major market. Stabilized zirconia is also used in oxygen sensors and fuel cell separators because of its ability to allow oxygen ions to move freely in the crystal structure under high-temperature conditions. This high ionic conductivity (and low-variable electronic conductivity) makes it one of the most potential electrical ceramic materials. Chemical-grade zirconia is often used in electrofusion products, and other specialty products markets include suction pumps and high-value parts, special tool parts, and brake pad linings. The gem market also uses fully stabilized cubic phase yttria-stabilized zirconia, which is used as a cheap substitute for gems in the jewelry industry.  

The wear-resistant ceramic sheet is a special corundum ceramic made of AL2O3 as the main raw material, rare metal oxide as the flux, and calcined at a high temperature of 1,700 bai. It is a high-wear resistance material, its wear resistance is equivalent to 266 times that of manganese steel and 171.5 times that of high chromium cast iron.   Not only does it have good wear resistance, but it also has the characteristics of high hardness. Its Rockwell hardness is HRA80-90, which is second only to diamond and far exceeds the wear resistance of wear-resistant steel and stainless steel. The weight is much lighter than steel, which can reduce the load on the equipment. It is widely used in coal handling, material conveying systems, pulverizing systems, ash discharge, dust removal systems, and other mechanical equipment of thermal power, iron and steel, smelting, machinery, coal, mining, chemical, cement, port terminals and other enterprises.   How long the specific wear-resistant ceramic sheet can be used depends on the working conditions. Its service life depends on the size, concentration, impact speed, working temperature, and friction of the conveyed particles. Generally speaking, the smaller the particle, the lower the concentration, the smaller the impact force, and the longer the service life of the wear-resistant ceramic sheet.   Under the working conditions of conveying slag powder, 20mm wear-resistant ceramic sheets can generally be used for 8-10 years. In the pipeline conditions that transport bulk materials, wear-resistant ceramics may be worn off in less than half a year. Therefore, it is necessary to choose different wear-resistant ceramic products according to different working conditions.  

With the continuous progress of industry and the country's emphasis on environmental protection, the demand for the quantity and variety of wear-resistant materials is also expanding. With the continuous development of the wear-resistant industry, the accompanying problems have also followed, which has brought a great impact on the development of the wear-resistant industry.   1. Our country has not formed a large-scale production enterprise. Judging from the current situation, small and medium-sized enterprises account for a large share of my country's wear-resistant industry, so they have not formed a strong competitiveness in terms of scale. With the continuous advancement of global economic integration in recent years, foreign companies entering the Chinese market have made my country's wear-resistant industry vulnerable to the market. The reason may be that wear-resistant materials are incidental products and have no profit The host equipment is large, and many manufacturers are reluctant to produce it. Contrary to our country, overseas companies dominated by wear-resistant materials have changed their traditional single-product production concepts in their development strategies and started diversified and specialized production. This is a great reference for the development of my country's wear-resistant industry. significance.   2. The state's protection of intellectual property rights is not strong enough, and imitation problems emerge one after another. Scientific and technological progress has brought great convenience to human production and life, but it has also brought some unnecessary troubles. The duplication of outstanding achievements has become a common problem in our country. As a result of the rapid reproducibility of modern enterprises, wear-resistant enterprises are unwilling to invest large costs in research and development of new technologies. In addition, wear-resistant products have low profits. Many enterprises only pay attention to the investment and cost of large-scale equipment and the demand for wear-resistant parts. Use high technology to imitate other brand manufacturers to reduce investment.   3. The concept of industry collaboration is weak. Since ancient times, the competitive ideology of "shopping malls without fathers and sons" has made the same industries inextricably linked. To occupy the market alone, the wear-resistant industry has adopted isolation and secrecy from peer companies. However, with the continuous advancement of modern business concepts, mutual benefit has become a key factor for an enterprise to achieve great development. The world is interconnected, and absolute opposition does not exist. It is understood that some foreign businessmen often take advantage of the incoordination between our industries and policy loopholes to lower prices and profit from them. These lessons are not uncommon.   4. The wear-resistant industry is an emerging industry that has developed rapidly in recent years. With the continuous development of the economic situation, the level of awareness of the industry is also constantly improving. We believe that through the joint efforts of wear-resistant manufacturers, we can overcome the problems in development together, Cooperate, and become bigger and stronger, my country's wear-resistant industry will surely obtain better development space.  

The wear-resistant ceramic sheet is a special corundum ceramic made of AL2O3 as the main raw material and rare metal oxide as the flux, which is calcined at a high temperature of 1700 Baidu. Wear-resistant ceramics is a material specially designed for wear-resistant equipment. It has high hardness, convenient construction, strong heat resistance, and low price. It is the choice of enterprises in recent years. Compared with the same thickness of ceramics and steel plates, the performance of ceramics is 20 times stronger. . 1. High hardness: Its Rockwell hardness is HRA80-90, second only to diamond in hardness, far exceeding the wear resistance of high manganese steel and stainless steel.   2. Excellent wear resistance: its properties are 266 times that of manganese steel and 171.5 times that of high-chromium cast iron. According to our customer follow-up survey for more than ten years, under the same working conditions, the service life of the equipment can be extended by at least ten times.   3. Lightweight: its density is 3.6g/cm3, which is only half of that of steel, which can greatly reduce the equipment load.   4. Firm bonding and good heat resistance: The wear-resistant ceramic sheet is pasted on the inner wall of the equipment with heat-resistant superglue. It can run for a long time at 350°C without aging, and the inorganic adhesive used for cemented products can withstand a temperature of 750°C. The temperature resistance and adhesion performance of the adhesive are second to none in China.   5. Long service life: The service life of wear-resistant ceramic sheets is 8-9 times that of ordinary steel plates.   In summary, the wear resistance of wear-resistant ceramic sheets is 9 times that of 16Mn steel, 8 times that of 65Mn steel, and 45 times that of refractory castables. It can be used in power plants, cement, petroleum, chemical industries, and other equipment. Anti-wear and anti-corrosion treatment is the most ideal wear-resistant material, which effectively solves the problem of downtime and maintenance in all walks of life.  

Wear-resistant ceramic pipes have corrosion resistance and heat resistance and are widely used in the transportation of abrasive particulate materials and corrosive media. Next, let's talk about what should be paid attention to during the storage and transportation of ceramic pipes.   1. Do not open the package during transportation, so as not to absorb moisture and affect the use effect, make it waterproof and oil-proof during storage and transportation, and keep the ceramic surface water-free, oil-free, dry, and clean at all times.   2. Although alumina ceramics have high hardness, they are brittle. During transportation, it is necessary to avoid collision with hard objects or collision between ceramics, especially since the edge position of ceramics needs to be protected.    3. The wear-resistant ceramic pipeline transportation vehicle needs to be waterproof and moisture-proof, and must not be exposed to oil or vapor during transportation.   4. The surface of the wear-resistant ceramic pipe is smooth, and it is easy to slide and cause collision, so pay attention to the speed control and pipe placement during transportation, avoid large vibration, and take anti-skid measures.   Wear-resistant ceramic pipes overcome the characteristics of low hardness, poor wear resistance, and poor toughness of steel pipes, and corundum ceramics give full play to high hardness, high wear resistance, corrosion resistance and good heat resistance. Therefore, the ceramic composite pipe has good comprehensive properties, such as heat resistance, corrosion resistance, mechanical shock resistance and thermal shock resistance, and good weldability.  

Wear-resistant ceramics are a kind of special ceramics fired at high temperature. Wear-resistant ceramics are widely used in the market, which is different from the ceramics used in people's daily life. Wear-resistant ceramics have been used in all walks of life, so since wear-resistant ceramics are so widely used, how to install wear-resistant ceramics?   Welding:The welding type is to weld the ceramics to the facility through the cold welding holes between the ceramics, and at the same time stick with adhesive to achieve double insurance. The welded type is suitable for high temperature pipelines (500 °C), such as the inlet and outlet pipelines of humidification towers, and the dust removal pipelines at the kiln tail, etc. It is specially designed for wear resistance of high temperature pneumatic conveying equipment.    Paste type:The paste-type installation is simple, the cost is low, and it is in line with the large-scale construction on site. The traditional process uses epoxy-type adhesive paste wear-resistant ceramics. This type of viscose is mainly organic, not resistant to high temperature, and easy to age. It cannot adapt to the requirements of perennial use. If it is operated under very high temperature all the year round, the viscose will easily age and become brittle. Especially in the case of rapid cooling and rapid heating, the thermal expansion parameters of ceramics and rails are different, and the organic viscose is brittle, which is easy to peel off the whole ceramic. This process is only suitable for room temperature below 150 degrees.   Dovetail Cassette:The dovetail card type is an installation method in which two trapezoidal steel bars are cold-welded in parallel on the facility to form a dovetail groove, and then the dovetail ceramic is inserted into the dovetail groove. This method is mature and reliable, and can withstand high temperature of 700 ℃, which is especially suitable for anti-wear of moving parts, such as fan impellers. However, the process of this wear-resistant ceramic is complex and only suitable for flat construction.  

In the production process of wear-resistant ceramics, the commonly used forming methods include dry pressing and isostatic pressing. Dry pressing, also known as molding, is one of the most commonly used forming methods. In the production process of wear-resistant ceramics, dry pressing is to put powder with good fluidity and suitable particle gradation after granulation into the metal mold cavity and apply pressure through the indenter, and the indenter is displaced in the mold cavity. The pressure is transmitted, so that the powder particles in the cavity are rearranged deformed, and compacted to form a ceramic green body with a certain strength and shape.   The essence of dry pressing is that under the action of external force, the particles approach each other in the mold, and the particles are firmly connected with the help of internal friction to maintain a certain shape. This internal frictional force acts on a thin layer of binder around the particles that are close to each other. As the pressure increases, the blanks will change shape, slide against each other, reduce the gap, gradually increase the contact, and stick to each other. As the particles get closer together, the force between the colloidal molecules and the particles is strengthened, so the green body has a certain mechanical strength.    Features of dry pressing Advantage：The dry pressing process is simple, the operation is convenient, the cycle is short, the efficiency is high, and it is convenient for automatic production. The embryo body produced by dry pressing also has the characteristics of high density, accurate size, small shrinkage, high mechanical strength, and good electrical properties.   Shortcoming:Dry pressing is difficult to apply to the production of large-scale embryos, and it has large wear on the mold, complex processing, high cost, and a relatively single pressure direction. It can only be pressed up and down, and the pressure distribution is uneven, resulting in uneven density and uneven shrinkage of the embryo. , will produce cracking, delamination and other phenomena. Dry pressing has distinct characteristics and a wide range of applications. According to the principle and characteristics of dry pressing, we can improve the process in the production process, or use more advanced isostatic pressing instead of dry pressing to improve wear-resistant ceramics. Embryo mass.  

In recent years, industrial ceramics have been widely used in all walks of life, among which alumina ceramics and zirconia ceramics are particularly common. These two ceramic materials have their own strengths, and many companies do not know how to choose. Now let's analyze what are the differences between alumina ceramics and zirconia ceramics.   The difference in density:The density of zirconia ceramics is twice that of alumina ceramics, and the compressive properties of zirconia are better.      The difference in density: The density of zirconia ceramic structural parts is higher than that of alumina ceramics. The density of alumina ceramics is 3.7-3.95, the density of zirconia structural parts is 6, and the texture is more delicate. ▽9 or more. Differences in surface finish: The surface finish of zirconia structural parts is higher, mirror-like, and smooth, which reduces friction with other accessories and has a longer service life. In addition, the toughness of zirconia ceramics is good, which overcomes the inherent brittleness of ceramics, has higher wear resistance, and greatly prolongs the service life of the product.   Differences in ceramic toughness: The toughness of zirconia is 4 times that of alumina ceramics. At the same time, the zirconia ceramics will only have some gaps when dropped freely from a height of one meter, and the alumina will be broken.   Differences in insulation properties: The insulating properties of alumina are better than those of zirconia.

There are two main types of ceramic wear-resistant elbows according to their materials, one is alumina-lined wear-resistant ceramic elbows, and the other is self-propagating ceramic wear-resistant elbows. What's the difference between the two?   Appearance color distinction 1. Alumina-lined wear-resistant ceramic elbow The inside of the elbow is a white alumina ceramic patch or an integral ceramic ring. Inside the self-propagating ceramic composite pipe is a black dense ceramic layer with metallic luster. 2. The steel parts of alumina ceramic wear-resistant elbows are made of integral hot simmered seamless steel pipes, and the steel parts of self-propagating ceramic composite pipes are generally made of dried shrimps.     Distinguishing the connection method of pipe diameter 1. The diameter of alumina ceramic wear-resistant elbow is generally small, and the diameter from DN30 to DN200 is more. The steel parts of self-propagating ceramic composite pipes are generally between DN300-DN3000. 2. Alumina ceramic wear-resistant elbows cannot be directly welded, and need to add welding straight sections to facilitate the connection between wear-resistant elbows and pipes, and can also be flanged. Self-propagating ceramic elbows can be directly welded or flanged.   The production process is different 1. The self-propagating ceramic wear-resistant elbow is made by the flat self-propagating process, and the chemical reaction centrifugal force casting process is used. The ceramic tube produced by this process has many microscopic cracks, is brittle and fragile, and is easy to partially fall off and fail, and cannot be repaired after falling off. 2. The alumina ceramic wear-resistant elbow is composed of three layers of steel, viscose and ceramics. The steel is formed by 20# one-piece hot bending, and is bonded to the inner wall of the steel with inorganic adhesive. Grinding layer.   Ceramic wear-resistant elbows are often used in power plant coal powder, ash, cement plant cyclone, steel plant dust removal system, mine powder, tailings, backfill, coal mine, coal washing plant wear-resistant pipeline, coking plant coke particles, sintering plant materials The service life is more than 20 times higher than that of ordinary steel pipes, and it can also be used for the transportation of molten aluminum and corrosive media.