uhp 600mm graphite electrode
Structure introduction of uhp 600mm graphite electrode
Material structure: Pure uhp 600mm graphite electrode is a colorless and transparent crystal. Industrial uhp 600mm graphite electrode is light yellow, green, blue or even black depending on the type and content of impurities. The transparency varies with its purity. The crystal structure of uhp 600mm graphite electrode is divided into hexagonal or rhombohedral α-SiC and cubic β-SiC (called cubic uhp 600mm graphite electrode). α-SiC forms many different variants due to the different stacking sequences of carbon and silicon atoms in its crystal structure, and more than 70 kinds have been found. β-SiC transforms into α-SiC above 2100°C.
The industrial manufacturing method of uhp 600mm graphite electrode is to use high-quality quartz sand and petroleum coke in a resistance furnace. The refined uhp 600mm graphite electrode block is crushed, acid-base washed, magnetic separation and sieving or water separation to make products of various particle sizes. Uhp 600mm graphite electrode (SiC) has become an important abrasive due to its great hardness, but its application range exceeds that of ordinary abrasives. For example, its high temperature resistance and thermal conductivity make it one of the first-choice kiln furniture materials for tunnel kilns or shuttle kilns, and its electrical conductivity makes it an important electric heating element.
To prepare SiC products, firstly, SiC smelting block [or: SiC pellets] must be prepared. Because it contains C and is super hard, SiC pellets were once called: emery. But be careful: it has a different composition from natural emery (also known as garnet). In industrial production, SiC smelting block usually uses quartz, petroleum coke, etc. as raw materials, auxiliary recovery materials, spent materials, and after grinding and other processes, they are blended into a charge with a reasonable ratio and a suitable particle size (in order to adjust the gas permeability of the charge, an appropriate amount needs to be added. When preparing the green uhp 600mm graphite electrode, an appropriate amount of salt should be added to prepare the green uhp 600mm graphite electrode at high temperature.
The thermal equipment for preparing SiC smelting block at high temperature is a special uhp 600mm graphite electrode electric furnace. Its structure consists of the bottom of the furnace, the end wall with graphite electrode on the inner surface, detachable side walls, and the furnace core body (full name: electric heating in the center of the electric furnace The body is generally composed of graphite powder or petroleum coke installed in the center of the charge according to a certain shape and size, generally circular or rectangular. Its two ends are connected with graphite electrode). The firing method used in the electric furnace is commonly known as: buried powder firing.
It starts heating as soon as it is energized. The temperature of the furnace core is about 2500°C, or even higher (2600-2700°C). When the furnace charge reaches 1450°C, SiC is synthesized (but SiC is mainly formed at ≥1800°C) and releases co. However, SiC will decompose when ≥2600℃, but the decomposed si will form SiC with C in the charge. Each electric furnace is equipped with a set of transformers, but only a single electric furnace is powered during production, so as to adjust the voltage according to the electrical load characteristics to basically maintain a constant power. The high-power electric furnace needs to be heated for about 24 hours. After a power failure, the reaction of generating SiC is basically over. After a period of cooling, the side wall can be removed, and then the charge can be taken out gradually.