With the improvement of elbow performance requirements, wear-resistant elbow is gradually welcomed by the market, and wear-resistant elbow replaces some traditional elbows. This is basically because the wear-resistant elbow is of good quality and can adapt to some extreme environments, but many people do not know how to distinguish between wear-resistant elbow and traditional elbow. Now let's take you to understand.
performance comparison
1. Cast stone
In the past, cast stone elbows were mostly used in various factories, which were characterized by embrittlement, worn surface and wall thickness of 25 and 35mm, about 40mm. After a short time of wear and cracking, it will wear with the gap, requiring overhaul once, and the service life will be shortened. There are often pores in it, which is easy to leave hidden dangers. Once something unexpected happens, it will lead to irreparable results.
2. Cast steel
Cast steel (including alloy steel) is widely used in the field of wear resistance, and its manufacturing process is relatively simple. However, due to the limitations of material properties and process, the surface hardness of cast steel (about 60) is much lower than that of ceramic material (more than 80), and its wear resistance is only one tenth of that of ceramic material. Therefore, wear-resistant elbows generally do not use this material.
3. Centrifugal casting of composite ceramic pipe
This process is formed by self propagating centrifugal casting. It mainly uses the chemical reaction of the substance itself, the high temperature generated by exothermic combustion, and the technology of synthesizing new substances in the process of combustion wave propagation.
Compared with carbon steel and manganese steel pipes, the wear resistance of ceramic composite pipes formed by this method is improved to a certain extent. However, due to the low reaction temperature (the average temperature does not exceed 1200 ℃), it is also alumina, but the strength, hardness and density of alumina in high-temperature phase and low-temperature phase are quite different. In the actual preparation process, alumina and molten iron cannot be completely separated at low temperature due to the short reaction time of materials. As a result, the ceramic layer is not dense enough. However, the wear-resistant elbow is different. It has a very dense ceramic layer, and the actual anti-wear effect is also very prominent.
In addition, the centrifugal casting process of composite ceramic pipe determines that it is not suitable for elbow and sizing head. Under general process conditions. Composite ceramic pipes can only be made into straight pipes. In order to form bends or small tubes, straight pipes must be divided into several welded parts. The inner wall of formed elbow and small round head is not streamlined, which hinders material transportation and reduces equipment output.
Therefore, it can be seen from the above that the cost performance of wear-resistant ceramic elbow is very high. When purchasing elbows, if the conditions are appropriate, wear-resistant elbows can be used, which not only enhances the wear resistance of elbows, but also prolongs their service life.
