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

When it comes to ceramics, everyone will feel very familiar. It has penetrated into all aspects of our lives. There are many ceramic products in our daily pots and pans, and our Chinese ceramics are world-renowned and are the works of art that many people dream of. And collectibles, the Chinese English word "china" also means ceramics. However, today's ceramics are not only used in life, but also occupy an increasingly important position in many fields such as industry, scientific research, food, medical care, etc. They have a new name called special ceramics. So what is special ceramics? How is it different from ordinary ceramics?   The term special ceramics first appeared in the UK in the 1950s. At that time, people were called refractory materials, electronic ceramics, electric ceramics, atomic energy ceramics and so on due to their different properties and uses. It refers to the use of high-precision selected raw materials, with a chemical composition that can be precisely controlled, manufactured and processed according to methods that facilitate structural design and controlled manufacturing, and have excellent properties. Nowadays, it has many different names in different countries and regions. In the UK, it is called technical ceramics. In the United States, it is called advanced ceramics, modern ceramics or high-efficiency ceramics. In Japan, it is called fine ceramics and new ceramics. In our China, the name of special ceramics is widely known, but in addition, people also call it industrial ceramics and advanced ceramics.    There are obvious differences between special ceramics and ordinary ceramics, mainly in the following aspects. 1. Different raw materials: traditional ceramics use natural minerals as raw materials, such as clay, quartz, feldspar, etc.; while special ceramics use less or no clay, but use various processed chemicals or synthetic minerals as raw materials, such as alumina , zirconia, etc.   2. Different structure: traditional ceramics have many impurities and pores due to the relationship between materials and processes; while special ceramics are fine in texture and have excellent characteristics in terms of hardness, strength, high temperature, corrosion, oxidation, wear, etc. .   3. Different properties: Most traditional ceramics are mainly used for viewing and daily use; while special ceramics are often used in different aspects due to their own characteristics, such as high temperature resistance, oxidation resistance, corrosion resistance and other characteristics. .   4. Different production processes: The traditional ceramic production process is simple. After grouting, it can be shaped, and it can be simply fired if it is more complicated; and a series of complex production methods for special ceramics, whether it is pre-pressing, It takes a long time for injection, lamination or later isostatic pressing. If nothing else, it is much more complicated and stricter than traditional ceramics in terms of molding, not to mention the final cutting, Punch, grind and polish.   5. Different applications: traditional ceramics are mostly used in daily life, such as cups, bottles, pots, etc., which are commonly used in our daily life. Some of the more exquisite ones are used as handicrafts, and most of them have ornamental value; while special ceramics are different. Different characteristics, applied in various aspects, completely break the use restrictions of traditional ceramics, can be widely used, and bring convenience to people's lives.  

Wear-resistant ceramics are special corundum ceramics made of AL2O3 as the main raw material, rare metal oxides as the flux, and calcined at a high temperature of 1700 Baidu. As a new type of workpiece material, industrial ceramics have high-temperature resistance, high wear resistance, good toughness, high-temperature insulation, impact resistance, corrosion resistance, beating resistance, good welding performance, etc.   Features of wear-resistant ceramic lining: It has the characteristics of wear resistance, impact resistance, corrosion resistance, high-temperature resistance, and convenient construction. , ore concentrate, tailings, cement, etc.) is an ideal material for surface wear of conveying equipment. It is very safe to use in high-temperature corrosion, high-temperature wear, or high-temperature corrosion lining occasions, and its service life is longer than that of cast stone, wear-resistant alloy cast steel, steel Plastic, steel rubber, and other materials are ten to twenty times higher.    There are many forming methods of alumina ceramics, but the main ones are grouting, hot die casting, film rolling, dry pressing, isostatic pressing, casting, injection and gel injection molding, etc. Different forming methods correspond to different processes.   Different molding methods use different molds. Gypsum molds are used for grouting, metal molds are used for hot die casting and dry pressing, and rubber molds are mainly used for isostatic pressing. The above-mentioned various molding methods have different molding principles and processes, so their characteristics are also different, and each has its advantages and disadvantages. The choice of ceramic molding method should be comprehensively determined according to the performance requirements, shape, size, output, and economic benefits of the product. The grouting adopts an inexpensive gypsum mold, with simple equipment and low cost, and is suitable for the manufacture of complex-shaped ceramic parts and large-sized ceramic products.

Silicon carbide wear-resistant ceramic pipes are a kind of ceramic-lined steel pipes. The lining is made of high-temperature resistant silicon carbide ceramics. It has stable organic chemical properties, a high heat transfer coefficient, a small linear expansion coefficient, good wear resistance, fire resistance, and heat preservation. , High-temperature impact resistance, small size, lightweight, high compressive strength, good environmental protection, and energy-saving effect.   Silicon carbide wear-resistant ceramic pipes are a kind of ceramic-lined steel pipes. The lining is made of high-temperature resistant silicon carbide ceramics. It has stable organic chemical properties, a high heat transfer coefficient, a small linear expansion coefficient, good wear resistance, fire resistance, and heat preservation. , High-temperature impact resistance, small size, lightweight, high compressive strength, good environmental protection, and energy-saving effect.    Silicon carbide ceramic composite pipes make full use of the characteristics of seamless steel pipes with high hardness, good ductility, impact resistance, good welding performance, high strength of corundum porcelain, wear resistance, corrosion resistance, and good temperature resistance, and get rid of seamless steel pipes. Low strength, poor wear resistance, poor ductility of porcelain. Therefore, silicon carbide wear-resistant ceramic pipes have good comprehensive properties such as wear resistance, high-temperature resistance, corrosion resistance, mechanical equipment impact resistance, high-temperature impact resistance, and good welding performance. It is a good wear-resistant and corrosion-resistant pipeline, such as the transportation of particulate raw materials, cutting and eroding substances.   Silicon carbide wear-resistant ceramic pipes are mainly used in logistics conveying systems in high-temperature environments. They have strong wear resistance and corrosion resistance and are cost-effective pipes in high-temperature conveying systems.  

The main component of an alumina ceramic sheet is alumina. Because of its high hardness and outstanding wear resistance, it has become the main product in the anti-wear industry, but the wear-resistant ceramic sheet itself does not have the function of sticking and needs to be used with ceramic glue. How to choose the ceramic glue is also a very particular problem, because the ceramic glue is used as the adhesive when the ceramic sheet is installed. Only by choosing the correct ceramic glue can the strength of the ceramic sheet achieve the best effect. The commonly used ceramic adhesives are roughly divided into three kinds:   1. Normal temperature type; the use temperature is within 150 degrees, which has a good sticking effect, and is also a commonly used model and variety, but its temperature-resistant area can only be within 150 degrees, and the sticking performance will decrease when it exceeds 150 degrees. The rise will gradually lose the sticking ability.    2. Medium temperature type; when the operating temperature is within 250 degrees, its bonding performance is the same as that of normal temperature glue, but its temperature resistance is as high as 250 degrees, and the top and side surfaces of the bonding equipment have a very good effect. Due to its high-temperature resistance, it is relatively It is relatively viscous, and it has a good effect on bonding large ceramic plates. There will be no problems such as falling off or flowing the ceramic plate before it is cured after pasting.   3. High-temperature type; Temperature-resistant ceramic glue is developed and produced for the use part of 350 degrees, and has a good effect on the high-temperature part, but the overall price will rise due to the high cost.  

The pulverized coal pipeline is used to transport high-temperature gas mixed with hard particles. Its operating characteristics are high temperature, high flow rate, high particle hardness, and serious equipment wear, especially the elbow part, without any protective measures. Put on. Most of this equipment is mounted on high-altitude supports, which are inconvenient for maintenance. Once worn out, the safe use of the equipment will be seriously affected.   The service life of the pulverized coal conveying pipeline is greatly improved after being lined with wear-resistant ceramics. The corundum ceramic lining is a material with wear resistance, high-temperature resistance, high hardness, acid and alkali corrosion resistance, and very high thermal stability. The steel pipe is bonded by wear-resistant ceramic adhesive, which is convenient for construction, has high bonding strength, and the lining is smooth and does not accumulate material.    Ceramic pipes are lined with corundum ceramics, which is generally ten times or even dozens of times that of ordinary steel pipes, and has a qualitative leap in wear resistance with wear-resistant alloy cast steel pipes and cast stone pipes. The service life of ordinary steel pipes is half a year to one year, and the service life of wear-resistant ceramic pipes can reach 5 to 10 years, which greatly reduces the number of equipment downtime and maintenance, and saves a lot of manpower and material costs for enterprises. It is a very cost-effective anti-wear scheme for pulverized coal conveying pipelines.

Wear-resistant ceramic glue is the main tool for fixing wear-resistant ceramic tube lining ceramics. Its use method is very different from ordinary glue. Let's talk about the specific use steps of wear-resistant ceramic glue. Grinding and dust removal: Before pasting the wear-resistant ceramic sheet, first grind and dust off the steel parts of the porcelain pasting equipment to remove rust until the original color of the metal is exposed.   Glue.:Under normal temperature conditions, mix according to the ratio of AB glue 2:1, and stir evenly, after the preparation is completed, try to use it up within 30 minutes to prevent the glue from curing.    Apply: Apply glue to the ceramic parts that have been polished and cleaned, and be sure to apply it fully, and there should be no glue shortage. Make sure that the front and all sides of the ceramics are covered with adhesive, and the gaps between the ceramics should also be filled with adhesive.   Bonding: After the gluing is completed, use a blade to cut the adhesive tape, and use a wooden hammer to compact the ceramic sheet to let the excess glue flow out. To ensure the adhesive strength, the thickness of the glue should be kept within 0.5mm.   Patching: The gap between the ceramic sheets should be filled with wear-resistant ceramic glue, the size of the gap should be kept within 1mm, the glue should be evenly filled, and there should be no glue leakage. Curing: After the ceramic sheet is pasted, it can be put into use after curing for 24 hours to 48 hours.

The installation process of alumina ceramic tube is mainly divided into three steps: porcelain ring splicing, porcelain ring pasting and grinding. Porcelain ring splicing: Porcelain rings are spliced with glue according to the requirements of the drawings to ensure that the interior is flat. Porcelain ring paste: apply the adjusted adhesive on the inner wall of the pipe to ensure that it is even, and then apply the adhesive on the spliced ceramic ring to ensure that the entire pipe is pasted on the inner wall of the pipe at one time. After fixing, check whether there is any dislocation and leakage of glue on the inner wall of the pipe. After checking, place the pasted pipe in the designated position. Grinding: After the adhesive is completely cured, grind the excess ceramic rings on both sides of the pipe to ensure that it is flat and does not damage the flange.

When the flow direction changes, the acting torque of the fluid on the wear-resistant ceramic compensator cancels each other out, and there is no undercut phenomenon of the wear-resistant ceramic compensator, so the dynamic stability is relatively good. The pressure drop inspection of the wear-resistant ceramic compensator is carried out during the clean water simulation debugging.   During the full stroke operation of the wear-resistant ceramic compensator, check the pressure drop changes at both ends of the wear-resistant ceramic compensator, whether there is noise caused by cavitation or flash evaporation, how the flow rate changes, and whether it meets the designed flow characteristics Wait. Start timing when the wear-resistant ceramic compensator changes and the time required for the valve position of the wear-resistant ceramic compensator to reach 63% of the steady state position is the response time, and the time should meet the operational requirements of the process production process.    The thickness of the ceramic patch has reached 8-10mm. Adding a 10mm thick wear-resistant layer to some large-diameter corrugated compensators is equivalent to reducing the inner diameter by 20mm. If the diameter is large, it may not be obvious. However, it is prominent in some pipelines, such as stainless steel corrugated compensators with a diameter of around DN200. At this time, we need to consider the problem of inner diameter.   If you want to keep the inner diameter of the stainless steel corrugated compensator with normal specifications, then you need to enlarge the overall outer corrugated pipe to ensure the inner diameter of the finished product. The valve body of the wear-resistant ceramic compensator is straight-through, and the fluid is blocked by the ceramic inner wall moving down and pressing the valve body. Because the valve body is straight-through, the fluid blocking and sealing ability is not as good as the weir-type wear-resistant ceramic compensator.   Affected by the ceramic inner wall and lining material, the wear-resistant ceramic compensator cannot be used in high-temperature and high-pressure conditions. The general working pressure is not more than 1.6MPa, and the working temperature is not more than 150℃. The wear-resistant ceramic compensator seals the fluid with a ceramic inner wall, therefore, no packing is required, which reduces the dead zone limit and avoids leakage. However, due to the material characteristics of the ceramic inner wall, its reproducibility is not high, and there is a large hysteresis.   The flow characteristic of the wear-resistant ceramic compensator is similar to the quick-opening characteristic, that is, it presents a linear characteristic within 60% of the stroke, and after more than 60% of the stroke, the flow changes very little. The flexural deformation of the bending arm of the wear-resistant ceramic compensator enables the wear-resistant ceramic compensator to press the sealing ring tightly to ensure a good seal, and the standard leakage is less than 0.01% ℃.

The effect of wear-resistant ceramics is mainly reflected in the wear resistance of ceramic materials. To obtain Al2O3 ceramic material with high wear resistance, it is necessary not only to make it have high density, flexural strength, and compressive strength but also to improve its hardness and fracture toughness, which is consistent with the microstructure of Al2O3 ceramics (pore closure, grain size, glass distribution state, etc.) and its wear mechanism are closely related.   During the preparation process, various process conditions of alumina ceramics have a great influence on its sintering and microstructure. These techniques include the powder preparation process, particle size distribution, molding method, billet density, sintering temperature, heating rate, holding time, atmospheric heating, pressure, etc. Control the three main factors affecting the performance of wear-resistant ceramics, namely better alumina raw materials and their grinding grades, preparation methods of high-density green bodies, reasonable combustion temperature and holding time, so that the comprehensive performance of the produced wear-resistant ceramics is excellent, The microstructural display is also very beneficial for wear resistance.     High-purity Al2O3 powder is an important raw material for wear-resistant ceramics, and its properties and content have a great influence on alumina ceramics. During the preparation of ceramic powder, impurities are inevitably introduced, organic impurities are burned during the sintering process, and irregular pores appear during the densification process; inorganic impurities may react with the ceramic powder at high temperature, or leave microcracks in the matrix. These microstructural defects caused by impurities seriously affect the compactness of alumina ceramics. High-purity Al2O3 powder is an important prerequisite for the preparation of alumina ceramics with excellent properties.   Wear-resistant ceramics are wear-resistant ceramic powders purified from industrial sintered powders through multiple processes. According to product requirements, formula mixing, molding, sintering, and other processes. The wear-resistant ceramics produced by this method have good performance, but due to the long process, the production cost is high. To save costs, minerals such as kaolin are also used directly as the main raw material on the market, with a small amount of sintered alumina added. At present, the existing alumina ceramic waste is used as the main raw material. The alumina ceramics that form the α phase cannot organically combine with the surrounding molecules, resulting in poor compact wear resistance. Therefore, there is a huge price difference in the market for wear-resistant ceramics.

Hunan Yibeinuo New Material Co., Ltd. is one of the very professional equipment anti-wear enterprises, focusing on the research and development of wear-resistant ceramics, new materials, and anti-wear and energy-saving technologies, dedicated to cement, thermal power, steel, coal, ports, chemicals, Mineral processing, petroleum, machinery and other industries provide a set of anti-wear technical services such as technical consultation, engineering design, equipment production, and equipment installation to achieve energy saving and consumption reduction of enterprises.    The application scope of wear-resistant ceramics in the mineral processing industry mainly includes the following aspects: 1. Material conveying system: bucket wheel side guard, bucket wheel feed chute, belt drum, belt cleaner, ceramic bearing idler, stacker feed bin, coke hopper, hopper, vibrating feed screen castor plate, Zipper feeding chute, screw conveyor rotor, ore transfer hopper, etc. 2. Medium-speed grinding (vertical grinding): vertical grinding feed trough. Three lock dampers. Vertical grinding roller sealing ring. Vertical grinding cylinder. Vertical grinding of the inner vertebral body. Select the cone of the powder machine. Select the static blade of the powder machine. Select the support rod for the powder machine. Select the shell of the powder machine. Vertical mill outlet air duct. Cyclone etc. 3. Slurry conveying system: tailings slag discharge pipe, elbow, ceramic valve, rubber hose, ceramic pinch valve, screw conveyor, pulp conveying pipe, pump casing, distributor, etc. 4. Separation system: cyclone, cyclone bottom push, magnetic separator cylinder, ceramic vacuum filter, etc.