Roland graphite E+40 high-purity graphite powder high-temperature resistant graphite crucible

Roland graphite E+40 high-purity graphite powder high-temperature resistant graphite crucible

Hongnide's graphite crucible refers to a crucible made of graphite, clay, silicon dioxide, and wax stone. Graphite crucibles are mainly used for melting non-ferrous metals and their alloys such as copper, brass, gold, silver, zinc, lead, etc. The graphite crucible is mainly made of natural flake graphite as the main raw material, with plastic refractory clay or carbon as the binder. It has the characteristics of high temperature resistance, strong thermal conductivity, good corrosion resistance, and long service life. During high temperature use, the coefficient of thermal expansion is small, and it has a certain strain resistance to rapid cooling and heating. It has strong corrosion resistance to acidic and alkaline solutions, excellent chemical stability, and does not participate in any chemical reactions during the smelting process. The inner wall of the graphite crucible is smooth, and the molten metal is not easy to leak or adhere to the inner wall of the crucible, making the metal liquid have good fluidity and castability, suitable for casting various molds. Due to the excellent characteristics mentioned above, graphite crucibles are widely used in the smelting of alloy tool steel and non-ferrous metals and their alloys. The main raw materials for the Hongnaide graphite crucible are graphite, silicon carbide, silica, refractory clay, asphalt, and tar. Graphite is the main raw material for crucible production, accounting for 45-55% of the ingredients, among which crystalline flake and needle shaped (block shaped) graphite are preferred. In the production of graphite crucibles in China, sheet-like medium carbon graphite with a carbon content of 85-93% is generally used. Choose graphite particle size based on the performance, purpose, model, and specifications of the crucible. Usually, large crucibles with a volume of 100 # or more use flake graphite with a mesh size of 32 or more; Medium sized crucibles with volumes ranging from 60 # to 80 # use 80 mesh flake graphite; Use 100 mesh flake graphite for small crucibles with a volume of 50 # or less; Handmade shaped crucible -100 mesh fine flake graphite. Refractory clay is mainly used as an inorganic binder for plastic molding. It requires pure clay composition, strong plasticity, and stable physical and chemical properties. It also has high fire resistance and good thermal effect. Due to the different materials and usage conditions used in crucible melting, the proportions of various raw materials in the production mix are also different. The production process of Hongnide graphite crucible should be reasonably determined based on the performance, purpose, and usage conditions of the crucible. The manufacturing process of Hongnide graphite crucible can be divided into three types: manual molding, rotary molding, and compression molding. The quality of the crucible is closely related to the molding process. The forming method determines the structure, density, porosity, and mechanical strength of the crucible blank. Handmade crucibles with special shapes are used for special purposes that cannot be formed by rotation or compression molding. Some irregular crucibles can be formed by a combination of rotational molding and manual molding. Rotary molding is the process of using a rotary can machine to drive the mold operation, extruding clay with an inner knife, and completing crucible molding. Compression molding is the use of pressure equipment such as oil pressure, water pressure, or air pressure as kinetic energy, and steel molds as molds to shape crucibles. Compared with rotational molding, it has the advantages of simple process, short production cycle, high yield, high efficiency, low labor intensity, less molding moisture, low crucible shrinkage and porosity, high product quality and density. The maintenance and preservation of the Hongnaide graphite crucible should be kept moisture-proof. Graphite crucibles are most susceptible to moisture, which greatly affects their quality. If a damp crucible is used, it will rupture, burst, and detach from the side and bottom, causing loss of molten metal and even industrial accidents. Therefore, the Hongnide graphite crucible must be kept moisture-proof during storage and use. The warehouse for storing graphite crucibles should be dry and ventilated, with a temperature between 5 ℃ and 25 ℃ and a relative humidity of 50-60%. Crucibles should not be stored on brick soil or cement floors to prevent moisture. Bulk graphite crucibles should be placed on wooden frames, preferably 25 to 30 centimeters above the ground. For complete items packaged in wooden boxes, wicker baskets, or straw bags, sleepers should be placed under the stack at a distance of not less than 20 centimeters from the ground. A layer of waterproof oilcloth should be placed on the sleepers to prevent moisture. After stacking for a period of time, the stack must be flipped, with the lower layer flipped on top of the upper layer. It is best to place the upper and lower layers facing each other. The time interval between turning over should not be too long. Generally, it should be flipped every two months. If the ground is not too damp, it can be turned over every three months. In short, frequently flipping and stacking will achieve the best moisture-proof effect.