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Taizhou Hongnaide Carbon Products Co., Ltd
SGL graphite R5600 graphite powder graphite paper
NegotiableUpdate on 12/15
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Overview
SGL graphite R5600 graphite powder graphite paper, circular edges and appropriate spacing: The design of graphite heating elements includes circular edges and appropriate gap spacing to reduce gas ionization at high temperatures. This design feature increases the expected lifespan and maximum achievable temperature of the heater.
Product Details
SGL graphite R5600 graphite powder graphite paper
The graphite mold of ultra-thin VC (Vapor Chamber) is a key tool in its production process, mainly used for precision machining of vacuum chambers and forming of heat dissipation structures. The following is a detailed analysis of ultra-thin VC graphite molds: 1 The core function of graphite molds is high thermal conductivity: Graphite has excellent thermal conductivity (up to 100-400 W/m · K), which can quickly transfer heat and ensure that VC cavity materials (such as copper and stainless steel) are uniformly heated and formed. High temperature stability: Maintain dimensional stability during brazing (600-900 ℃) or diffusion welding processes to avoid thermal deformation affecting VC sealing. Low thermal expansion coefficient: Dimensional stability at high temperatures to avoid mold deformation affecting VC thickness accuracy. Machinability: Graphite can accurately engrave complex microstructures (such as support columns and grooves), meeting the microchannel design requirements of ultra-thin VC (below 0.3mm). 2. Key design points for ultra-thin VC graphite molds: Microstructure accuracy: It is necessary to achieve micrometer level accuracy (such as capillary structures below 50 μ m) through CNC or laser processing, which directly affects the heat dissipation efficiency of VC. Thin wall strength optimization: The mold needs to maintain strength under ultra-thin (0.1~0.5mm) conditions to avoid cracking during sintering. Surface treatment: Some molds will use anti-oxidation coatings (such as silicon carbide) to extend their service life. Vacuum compatibility: The mold should avoid porous structures to prevent gas release from contaminating the VC cavity at high temperatures. 3. Material selection for key manufacturing process points: ≥ 99.95% isostatic pressed graphite, with impurity content below 50ppm and density ≥ 1.8g/cm ³. Processing technology: CNC precision carving: used for complex 3D structures, tool diameter may be as small as 0.1mm. Demolding design: ultra-thin VC is prone to adhesion, and the mold needs to be designed with gradient demolding angles or the use of demolding agents. 4. Industry Applications and Challenges Application Scenarios: 5G smartphones (such as VC cooling modules for iPhones), high-performance chips (such as GPU/CPU heat sharing boards).
SGL graphite R5600 graphite powder graphite paper
In recent years, the continuous casting industry has been promoting excellent production methods such as direct continuous (or semi continuous) manufacturing of bars or pipes from molten metal state both domestically and internationally. Artificial graphite is considered a suitable material for continuous or semi continuous casting molds of non-ferrous metals. Production practice has proven that the continuous casting industry uses graphite molds, which not only improve the casting speed due to their good thermal conductivity (which determines the solidification speed of metals or alloys), good self-lubricating properties of the molds, but also have high dimensional accuracy, smooth surface, and uniform crystal structure, allowing for direct processing of the next process. This not only greatly improves the yield rate and reduces waste losses, but also significantly improves product quality. There are two types of continuous casting methods: vertical continuous casting and horizontal continuous casting. Continuous casting of graphite molds is also applied in the metal smelting industry, where melted metal can be cast using graphite molds. Graphite molds can be reused, but some designs can only be disposable. Graphite molds can be used to directly cast creative small grain castings. The coefficient of thermal expansion is an important factor determining the use of graphite as a mold material. A mold is a medium with very uneven temperature, which is heated internally due to the molten material and cooled externally due to the cooling process applied to it. The low thermal expansion coefficient exhibited by graphite enables the mold to function without deformation or cracking. Another very important factor is self-lubricating. Graphite is a solid lubricant that can create low friction between molds and casting materials. Subsequently, graphite can be smoothly extracted from castings. There are many factors that determine the lifespan of continuous casting graphite molds. The composition of the casting material, casting temperature, and cooling rate all affect the lifespan of graphite molds. The specific grade of graphite used is also determined by multiple factors. The main factor is the material and process field in which the to be cast mold is applied. For example, for gray cast iron or high nickel alloys, high-temperature resistant graphite is required, while for brass, relatively dense graphite with sufficient porosity to allow zinc evaporation would be a good choice.
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