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

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.

Pipes below Ø89mm are collectively referred to as small-diameter pipes. Compared with large-diameter pipes, the average cost of small-diameter wear-resistant ceramic pipes is much higher than that of large-diameter wear-resistant ceramic pipes. Why is the production cost of small-diameter wear-resistant ceramic pipes relatively high? We analyze the following aspects:   The casting process of the outer steel pipe of the small-diameter wear-resistant ceramic pipe is more complicated, and the output is much lower than that of the large-diameter steel pipe;   The inner diameter of small-diameter wear-resistant ceramic pipes is usually less than 80mm, and it is difficult for construction technicians to paste the porcelain by hand. If the pipeline is long, it needs to be cut off and then welded after the porcelain is pasted. The construction is difficult and the construction process is more complicated;   If small-diameter wear-resistant ceramic pipes do not want to be cut off, more expensive wear-resistant ceramic materials, such as ceramic rings and integral ceramic pipes, are usually used, and the production cost is higher;   If the small-diameter wear-resistant ceramic pipe is an elbow or a tee, it usually needs to customize a special ceramic ring and an integral ceramic pipe, and the mold cost is high;   In summary, the reasons for the higher cost of small-diameter wear-resistant ceramic pipes are the complex casting process of external steel pipes, low output, and the construction of internal wear-resistant ceramic materials is difficult and material costs are higher.

Wear-resistant ceramic liners have high strength, wear resistance, convenient installation, high-cost performance, high-temperature, and corrosion resistance. Wear-resistant ceramic liners can be divided into the following categories according to different processes. Paste-type wear-resistant ceramic liner: The paste-type wear-resistant ceramic liner is pasted on the inner surface of the facility with ceramic glue. This method is suitable for large-scale construction and saves maintenance time. It is suitable for use in working conditions with low temperatures;   Stud-welded wear-resistant ceramic liner: The stud-welded wear-resistant ceramic liner is welded to the machine and equipment according to the welding hole on the wear-resistant ceramic, and pasted with strong glue to To achieve the effect of two-layer reinforcement, it can withstand the high temperatures of about 600 degrees Celsius, but the construction space is required to be large, and the wear resistance is strong;    Dovetail strip card slot type wear-resistant ceramic lining plate: The dovetail slot ceramic lining plate fixes the dovetail ceramic lining plate on the facilities that need anti-wear according to the stainless steel plate slide rail. When applying, weld the dovetail rail to the position that needs anti-wear, and manipulate the spacing to ensure the gap between the ceramics. The unique ceramic card with dovetail slots is then attached to the slide rail, and the ceramic is attached along the rail orientation for installation. It can withstand high temperatures of 900 degrees Celsius and is suitable for working conditions with large impact or high temperatures.   Because of their excellent wear resistance, wear-resistant ceramic linings are widely used in thermal power plants, cement, steel, ports, mining, construction machinery, smelters, and other fields.

The radius of the ceramic wear-resistant elbow, also known as the bending radius R, refers to the radius of the circle. The larger the radius, the larger the circle and radian, and the more similar to a straight line. Therefore, the larger the radius of curvature, the smaller the resistance of conveying materials, and the smaller the radius, the greater the resistance.    The size of the radius of curvature is generally determined in multiples of the pipe diameter. Such as DN100, the radius of curvature is R10D, then the radius of curvature of the elbow is R1000. 1. The radius of curvature of the elbow of the power plant boiler powder feeding pipeline should be determined according to the requirements of the drawings, generally six to ten times. The ash conveying pipeline is severely worn for a long time, and the radius of curvature should be as large as possible. If the radius is small, the service life will be reduced. 2. Generally, the radius of curvature of tailings slurry in mine transportation is 2D to 5D. 3. The curvature radius of ceramic wear-resistant elbows generally used in cement plants to transport pulverized coal is 10D to 15D. 4. The radius of curvature of the elbow of the chemical ash conveying pipeline is 10D.   If there is a space limitation on the installation part of the ceramic wear-resistant elbow, we recommend that the minimum be not lower than R3.5D, and make a thickened backpack on the back to increase the service life of the small-radius elbow.  

The origin of the Dragon Boat Festival: The Dragon Boat Festival is also known as the Duanyang Festival, Chongwu Festival, Dragon Boat Festival, Dragon Day Festival, Zhengyang Festival, Yulan Festival, and Tianzhong Festival. It is the first festival in China to be selected as an intangible cultural heritage in the world. It originated in ancient China and is dated every year. The fifth day of the fifth lunar month. The Dragon Boat Festival was originally a festival to drive away the gods of plague and sacrifice to dragons in summer. There are folk customs such as "stealing the dragon boat", "eating zongzi", "putting paper kites", and "hanging wormwood and calamus". There are at least four or five theories about the origin of the Dragon Boat Festival. So far, the most influential point of view on the origin of the Dragon Boat Festival is to commemorate Qu Yuan. Legend has it that after Qu Yuan threw himself into the river, the local people injured him and died, so they tried their best to rescue him by boat, because of the custom of racing; it is also said that people often put food into the water to sacrifice Qu Yuan, but most of them were eaten by dragons, and only neem was used because of Qu Yuan's prompting. Rice is wrapped in leaves and wrapped with colored silk to make the later dumplings. In order to commemorate this day, people set it as the Dragon Boat Festival. The Dragon Boat Festival, the Spring Festival, the Qingming Festival, and the Mid-Autumn Festival are also known as the four traditional Chinese festivals.   The customs of the Dragon Boat Festival The Dragon Boat Festival customs mainly include shoveling the dragon boat, offering sacrifices to dragons, picking herbs, hanging wormwood and calamus, worshiping gods and ancestors, washing herbal water, playing water at noon, immersing in dragon boat water, eating rice dumplings, putting paper kites, watching dragon boats, tying five-color silk threads, and smoking Atractylodes, sachets, etc. Dragon boat racing is very popular in the coastal areas of southern China. After it was spread abroad, it was deeply loved by people from all over the world and formed an international competition. The custom of eating rice dumplings on the Dragon Boat Festival has been prevalent in all parts of China since ancient times and has become one of the most influential and wide-ranging folk eating customs of the Chinese nation. During the Dragon Boat Festival, traditional folk activities are performed, which can not only enrich the spiritual and cultural life of the masses but also inherit and carry forward traditional culture well. The Dragon Boat Festival has a wide influence in the world, and some countries and regions in the world also have activities to celebrate the Dragon Boat Festival. 1. Dragon Boat Race (Dragon Boat Row): Dragon Boat Race (Dragon Boat Row) is a symbolic activity of the Dragon Boat Festival, and it is a competition for many people to paddle. Every year on the fifth day of May, dragon boat races are held all over the country to commemorate the patriotic poet Qu Yuan. After the dragon boat race was spread abroad, it was deeply liked by the people of every country and formed an international competition. 2. Eating zongzi: Eating zongzi is one of the important customs of the Dragon Boat Festival. At the end of April and the beginning of May every year, people start to soak glutinous rice, clean the zongzi leaves, and wrap the zongzi to commemorate the great patriotic poet Qu Yuan in our country. 2022 Dragon Boat Festival: The holiday will be from 6.3 to 6.5, a total of 3 days.  

There are many factors that affect the price of corundum wear-resistant ceramic elbows, as follows: 1. Different production processes: there are pipeline lining ceramic patches, integral ceramic rings, stud welding ceramics, dovetail ceramics and other processes. Different production processes have different prices. The manufacturer will recommend it according to the on-site working conditions provided by the customer. Appropriate materials and workmanship;    2. The price of raw materials is different: if the price of corundum wear-resistant ceramic elbows of the same material is different, it may also be that the price of raw materials is different.   3. The freight is different: the location of different manufacturers may also be different, the distance between the place of delivery and the place of receipt is also different, and the corresponding freight will be slightly higher or lower.  

Transparency is a key property of alumina ceramics, which is not only related to the basic chemical composition of the material but also depends on the microstructure of the material. Therefore, the transparency of alumina ceramics depends on factors such as porosity, grain size, grain boundary structure, and surface finish of the ceramics.   The preparation process of alumina ceramics is essentially a densification process that eliminates microscopic pores during the sintering process. The size, number, and type of pores in the material will have a significant impact on its transparency. In addition to porosity, the diameter of the pores also has a great influence on the transmittance of alumina ceramics. When the diameter of the pores is equivalent to the wavelength of the incident light, the transmittance is the lowest.   The grain size of the alumina ceramic polycrystal also has a great influence on the light transmittance. When the incident light wavelength is equivalent to the grain diameter, the light scattering effect is the largest and the light transmittance is the lowest. Because of this, to improve the light transmittance of alumina ceramics, the grain size should be controlled outside the wavelength range of incident light.   It is understood that the grain boundary is one of the important factors that destroy the optical uniformity of the alumina ceramic body, thereby causing light scattering and reducing the light transmittance of the material. Moreover, the greater the composition difference of the materials, the greater the difference in refractive index, and the lower the light transmittance of the entire alumina ceramic.   In addition, the transmittance of alumina ceramics is also affected by the surface roughness, which is not only related to the fineness of the raw materials, but also related to the machining finish of the ceramic surface. The surface of the untreated alumina ceramic after sintering has a large roughness, so the light incident on this surface will have diffuse reflection, resulting in light loss.  

The design process of impact-resistant and wear-resistant ceramics is to prevent the wear-resistant ceramics from cracking and falling off under the impact of bulk materials. The toughening formula is used, and a spherical structure is added to the shape design, which can disperse the force from the impact of materials. Combined with the fixing process of stud welding and wear-resistant ceramic AB glue, the wear-resistant ceramic can be tightly combined with the equipment to a large extent, and it is not easy to fall off.   The impact resistance of impact-resistant and wear-resistant ceramics is very good. The hardness of wear-resistant ceramics is very high. The toughening formula enhances toughness and spherical structure design, and triple protection greatly enhances the service life of impact-resistant and wear-resistant ceramics.   The fixing process of stud welding and wear-resistant ceramic AB glue can make the wear-resistant ceramic tightly fixed on the surface of the equipment, and it can be easily faced even when working in a relatively harsh working environment.   In addition to the above advantages, impact-resistant wear-resistant ceramics also have wear resistance, corrosion resistance, self-lubrication, and other characteristics of wear-resistant ceramics. It is the best choice for anti-wear in bulk material conveying systems.  

Wear-resistant ceramic pipes are widely used. According to the operating conditions of the equipment, the operating temperature, the size of the material particles, the height of the drop, and the pressure environment, the design of the pipe lining ceramics is also different, which is mainly reflected in the radius of curvature of the elbow and the length of the pipe. , the thickness of ceramics, etc., only a reasonable design can really play the role of wear-resistant ceramic pipes. The ceramic wear-resistant elbow used in the powder feeding pipeline of the power plant boiler, the curvature radius of the elbow is generally 6-10 times the bending degree. To effectively alleviate the wear degree of the pipeline, try to use the elbow with a larger design curvature radius. higher.   When the tailings slurry is transported in the mining industry, the radius of curvature of the wear-resistant elbow is generally between 2D and 5D, which can achieve better results.   When transporting pulverized coal pipelines in the cement and coal industry, the radius of curvature of the wear-resistant elbows used is generally between 10D and 15D, which can ensure that the transported powder can be transported smoothly, and the pipeline wear is relatively small.   Stainless steel integral ceramic lined elbows or straight pipes are mainly used in the lithium battery industry, suitable for pneumatic conveying of powders, and will not age or fall off under long-term operation in an environment below 150 °C. Its life is more than 4-5 times that of ordinary pipes.   Therefore, it is very necessary to design reasonable wear-resistant ceramic elbows for different working conditions. Try to give full play to the wear resistance of ceramics and improve the service life of the pipeline.