hp graphite electrode supplier
A good helper to improve the performance of hp graphite electrode-silicon carbide
The earliest crucible in history was made of clay, but now as long as this material can withstand enough high temperature, it may become a qualified crucible, such as quartz, graphite and corundum are commonly used crucible materials. Among them, the hp graphite electrode is the most suitable crucible for smelting a variety of alloys and a small amount of alloys. Because of its good high temperature performance and long service life, it is widely used in large-scale alloy smelting casting process and ore smelting analysis.
Gold melts in hp graphite electrode
However, the hp graphite electrode is basically at a high temperature when in use, and there is a lot of air around the crucible because they are easily oxidized. In addition, the hp graphite electrode will be severely corroded during the smelting, casting and smelting process, reducing its service life. In order to improve the service life of the hp graphite electrode, scientists have proposed a method of adding corrosion-resistant materials to the hp graphite electrode.
Among the materials to be considered by hp graphite electrode supplier, silicon carbide is considered to be the best flux for hp graphite electrode due to its chemical stability and strong corrosion resistance. The oxidation product at high temperature is silicon dioxide, which can reduce the ceramic crucible’s Porosity improves the compactness of the crucible, thereby effectively increasing its service life.
However, the addition of materials should also pay attention to the scientific nature, don’t make mischief, and a reasonable combination can give full play to the advantages of the two. Generally speaking:
① With the increase of SiC content, the density of hp graphite electrode increases and the porosity decreases.
This is mainly because the density of silicon carbide is 3.2g/cm3 and the density of graphite is 2.62g/cm3. Therefore, as the silicon carbide content increases, the total volume of the hp graphite electrode decreases, the volume density gradually increases, and the porosity decreases sequentially.
This is because, on the one hand, SiC has good oxidation resistance. First, SiC reacts with CO to generate SiO gas and solid carbon. Carbon is deposited on the surface of SiC. Then SiO gas diffuses around and reacts with CO to generate SiO2 and C. These reactions make CO is reduced to C, and the volume expands. The expanded volume will block the pores in the hp graphite electrode, preventing oxygen from entering the crucible, thereby reducing its weight loss rate and improving oxidation resistance; on the other hand, the graphite in the crucible is scaly, The contact area with oxygen is large, and its oxidation rate is very fast. Therefore, as the graphite content decreases, the oxidation resistance of the hp graphite electrode will also be promoted.