Inside vacuum furnaces, graphite fixtures bear workpieces and circulate under temperature ranging from room temperature to 1300–2300°C. Material outgassing is a key indicator for vacuum graphite parts. If graphite contains excessive volatile impurities, gas will be released in vacuum environment, polluting workpieces and extending vacuum pumping time. Therefore, graphite used for vacuum equipment needs high-temperature degassing treatment before formal service.
Structural design directly affects fixture service life. Solid thick graphite plates suffer large internal thermal stress during rapid heating and cooling, easy to crack. Optimized hollow structure, reasonable reserved expansion gaps and rounded transition corners can effectively release thermal stress. For heavy-load sintering production, designers need to calculate bearing capacity of graphite beams and avoid permanent deformation or fracture under long-term high-temperature load.
Vacuum furnace graphite fixtures cover graphite bearing plates, graphite material frames, graphite support columns, graphite charging boats. Different workpieces put forward different demands: EDM graphite fixtures for tool steel sintering prioritize cost; graphite carriers for ceramic and semiconductor material annealing pursue ultra-low impurity and low gas release. Most customers adopt isostatic fine-grain graphite for high-end vacuum furnaces, while ordinary molded graphite can meet demand for low-temperature, low-precision sintering equipment.
Daily maintenance cannot be ignored. After long-term operation, graphite surface absorbs impurities. Regular vacuum high-temperature cleaning can remove adsorbed pollutants and reduce gas release during production. Avoid rapid inflation and sharp temperature fluctuation inside the furnace to reduce thermal shock damage to graphite fixtures.
Huixian Jincheng Abrasive & Graphite Mold Factory customizes all kinds of vacuum furnace graphite fixtures. Founded in 1984 in Huixian City, the enterprise can process split assembled graphite material frames, integrated graphite bearing plates, support columns and charging boats according to customer drawings. Equipped with more than 50 CNC machining equipment, Jincheng Graphite realizes smooth transition of all structural corners to reduce stress concentration. The factory can provide high-temperature degassing pretreatment of graphite parts to lower outgassing rate for vacuum working conditions. The technical team communicates with customers on load, maximum temperature and heating rate to optimize fixture thickness and assembly structure, extending service cycle of graphite fixtures.
The market demand for vacuum heat treatment equipment keeps growing driven by powder metallurgy, new energy material and ceramic industry. Stable, long-life graphite fixtures help heat treatment manufacturers lower consumable cost. Jincheng Graphite keeps optimizing fixture processing technology and structural design scheme to supply reliable graphite carrying components for vacuum furnace manufacturers and heat treatment processing enterprises worldwide.
