There are many places that carburizer manufacturers need to pay attention to. If they are added too early, some problems will occur. On the contrary, some problems will occur if they are added too late. Although the recarburizer has excellent performance, its wide application still faces some challenges. There are many types of recarburizers. Enterprises choose suitable recarburizer products according to their needs. There are also some practical problems in the manufacturing process, which need to be solved by relevant researchers. Colleagues or friends in this industry may be very clear, but most people still don't know much about this industry. Medium temperature asphalt
The use of carburizing agent in castings can greatly increase the amount of scrap, reduce the amount of pig iron or not use pig iron. At present, most carburetors are suitable for electric furnace smelting, and a few carburetors with fast absorption speed are used in cupolas. In the electric furnace smelting process, carburizing agent should be added into the furnace together with scrap steel and other materials in a way of replenishing. A small amount of carburizing agent can be added to the surface of the molten iron. However, in order to prevent the low-carbon effect caused by peroxidation and the insufficient carbon content of the castings, a large amount of molten iron must be avoided.
If the recarburizer is added too early, it will easily adhere to the bottom of the furnace, and the recarburizer attached to the furnace wall will not easily melt into molten iron. On the contrary, if the addition time is too late, the carburizing time will be lost, and the melting and heating time will be delayed. This not only delays the time of chemical composition analysis and adjustment, but also may cause harm due to overheating. Therefore, in the process of adding metal ingredients, it is better to add recarburizer point by point.
Silicon carbide (sic) has become an important abrasive due to its high hardness, but its application range is wider than that of ordinary abrasives. For example, its high temperature resistance and thermal conductivity make it one of the kiln furniture materials for tunnel kilns or shuttle kilns. Its electrical conductivity makes it an important electric heating element. To prepare silicon carbide products, you must first prepare a silicon carbide smelt block [or silicon carbide granular material, because it contains c and is super hard, so the silicon carbide granular material was once called diamond. But it should be noted that its composition is different from natural diamonds (also called garnets). In industrial production, silicon carbide smelt blocks are usually made of raw materials such as quartz, petroleum coke, auxiliary recycling materials, waste materials, etc., and are prepared by grinding and other processes, adding appropriate wood chips and salt at high temperatures.
The thermal equipment for preparing silicon carbide smelting block at high temperature is a special silicon carbide electric furnace. The structure consists of the bottom of the furnace, the end wall with the electrode embedded in the inner surface, the detachable side wall and the furnace core (the furnace center is called an electric heater), and it is generally installed in the charging center with graphite or polyethylene powder. Joule A joule of a certain shape and size, generally round or rectangular. shape. Its two ends are connected with electrodes, etc. The firing method used in this furnace is commonly known as buried powder firing. Heat up first when energized. The furnace core temperature is about 2500 degrees Celsius or even higher (2600-2700 degrees Celsius). When the charge reaches 1450c, sic starts to be synthesized (but sic is mainly formed in (>1800c), and co is released. When the temperature is higher than 2600℃, sic will decompose, but the decomposed si will form with c in the charge sic. Each group of electric furnaces is equipped with a set of transformers, but only one electric furnace supplies power during the production process, so that the voltage can be adjusted according to the characteristics of the electrical load, and the power is basically maintained. High-power electric furnaces need to be heated for about 24 hours. After a power failure, the sic generation reaction is basically over. After a period of cooling, the side wall can be removed, and then the load can be gradually unloaded.