Overview
Medium-coarse graphite molds are precision tools manufactured from graphite with intermediate grain sizes (typically 0.5-2mm). This balance between fine and coarse graphite provides optimal performance for many industrial processes requiring both thermal stability and cost efficiency. Unlike metallic molds, graphite molds maintain dimensional stability at extreme temperatures without melting or warping. Their self-lubricating properties also reduce sticking with molten materials, making them indispensable in foundries and high-tech manufacturing.
Structure and Working Principle
These molds consist of isotropic graphite blocks machined to precise geometries. The medium-coarse grain structure creates a network of micro-pores that absorb thermal expansion stresses while maintaining structural integrity. During operation, heat transfers rapidly through the graphite matrix, enabling uniform temperature distribution. The material's low thermal expansion coefficient (4-6 × 10⁻⁶/°C) prevents cracking during rapid temperature cycles, a critical advantage over ceramic alternatives.
Key Features
1. Thermal Performance: Withstands temperatures up to 2500°C in vacuum/inert gas, far exceeding most metals. 2. Chemical Resistance: Inert to most molten metals (aluminum, copper, gold) and acidic/alkaline fluxes used in glassworking. 3. Machinability: Can be CNC-milled to ±0.05mm tolerances, allowing complex mold designs without expensive tooling.
Application Areas
1. Metal Casting: Die casting molds for non-ferrous metals (zinc, aluminum alloys) with 5-10x longer lifespan than steel. 2. Glass Industry: Press molds for optical lenses and glassware, leveraging graphite's non-wetting properties. 3. Semiconductor: Crucibles for silicon crystal growth and wafer boats, where high purity (<5ppm ash) is critical.
Maintenance and Precautions
Proper handling extends mold lifespan significantly. Always store in dry conditions to prevent moisture absorption, which can cause cracking during rapid heating. For cleaning, use only compressed air or alcohol wipes—abrasive methods degrade surface finish. In oxidative environments, apply protective coatings (silicon carbide) or limit exposure temperatures to <400°C to prevent accelerated oxidation.
B2B Procurement Guide
When sourcing medium-coarse graphite molds, verify the graphite grade's flexural strength (minimum 30MPa) and bulk density (≥1.7g/cm³) for your application. Lead times vary from 2-6 weeks for custom molds. Consider ordering spare inserts for high-wear areas. For reference, standard 100x100mm casting molds range $200-300, while complex semiconductor fixtures may exceed $2000.
Related Manufacturers
- 主营：高纯石墨、石墨板、石墨模具、石墨棒、石墨粉、石墨乳、鳞片石墨、土状石墨、石墨管、柔性石墨
- 主营：石墨模具、石墨坩锅、石墨块、石墨板、石墨管、石墨环、石墨棒、石墨匣钵、石墨圈、石墨转子、石墨盒子、石墨锅、f-2石墨、石墨浇管、柔性石墨、石墨大梁、石墨轴套、迷山石墨、石墨制品、模具石墨、石墨螺栓、石墨加热器、阳极块、碳素制品、电池碳棒
- 主营：高纯石墨
- 主营：石墨板、低灰分石墨、高纯石墨板、等静压石墨、三高石墨、提纯石墨、西格里石墨、东洋石墨、东海石墨、美尔森石墨、POCO石墨
- 主营：铝型材、铝合金、结构钢、石墨板、石墨粉、石墨棒、导电石墨、柔性石墨、石墨坩埚、石墨定制、石墨材料、膨胀石墨、石墨匣钵、石墨电极、国标棒、刹车片、西格里、齿轮钢、不锈钢板、热轧钢板、镁合金棒、国标铝板、防火涂料、铸造涂料、耐火材料
- 主营：高纯石墨、等静压石墨、EDM电火花石墨、石墨电极、石墨粉、石墨坩埚、石墨板、石墨棒、石墨模具、石墨转子、石墨轴承、石墨环、石墨热场、石墨烯、石墨片、石墨柱、石墨套、放热焊接石墨模具、石墨换热器、石墨散热器、石墨毡、膨胀石墨、增碳剂、真空泵碳片、碳毡
- 主营：石墨舟、石墨板、石墨片、石墨块、三高石墨、电极石墨、石墨圆料、石墨配件、坩埚模具、烧结模具、石墨原料、石墨材料、石墨制品、石墨模具、烧结石墨、石墨坩埚、高纯石墨、进口石墨粉、耐氧化石墨、石墨连接板、等静压石墨、半导体石墨、石墨连接模具、工装夹具、锂电负极材料
- 主营：硅酸铝堵套、真空炉保温、耐腐蚀材料、硅酸铝纤维毡帽
- 主营：石墨轴承
- 主营：石墨烯、石墨板、膨胀石墨、高纯石墨、等静压石墨、石墨棒、石墨纸、石墨粉、石墨模具、石墨换热器、石墨管、石墨乳、石墨矿、石墨环、石墨设备、石墨坩埚、石墨块、石墨柱、石墨粒、石墨舟、石墨套、石墨螺丝、石墨片、鳞片石墨、增碳剂