Overview
Graphite splicing boards are engineered by bonding multiple graphite sheets under high pressure, creating large-format panels with isotropic properties. Unlike molded graphite, spliced versions eliminate directional weaknesses, making them ideal for critical applications like wafer processing and continuous casting molds. The splicing technique ensures minimal joint visibility and uniform thermal expansion. Industrial-grade variants typically use isostatic or extruded graphite as base materials, with specialized adhesives that withstand operational temperatures. Modern production employs CNC machining post-splicing to achieve tolerances within ±0.05mm, catering to industries requiring precision thermal management.
Structure and Working Principle
Structurally, these boards consist of 3-10mm thick graphite sheets joined edge-to-edge using high-temperature phenolic or carbon-based adhesives. The bond lines are chemically treated to match the parent material's conductivity. Under thermal load, the entire panel expands uniformly at 4-6×10⁻⁶/°C (RT-1000°C range), preventing warping. The working principle leverages graphite's crystalline lattice structure, where loosely bound electrons enable conductivity while hexagonal layers provide mechanical strength. Spliced boards maintain these properties across joints through controlled overlap designs (typically 10-15mm) and pressure curing at 200-300°C during manufacture.
Key Features
Thermal conductivity ranges between 70-150 W/m·K (parallel to grain), outperforming most metals in high-temperature stability. The material's emissivity of 0.7-0.8 makes it effective for radiant heating applications. Electrical resistivity stays stable at 8-13 μΩ·m even after prolonged use. Mechanically, spliced boards achieve flexural strength of 20-40 MPa, with compressive strength exceeding 80 MPa. Advanced grades incorporate silicon carbide or metal oxide additives for enhanced oxidation resistance up to 600°C in air. Surface finishes range from standard milled (Ra 3.2μm) to mirror-polished (Ra 0.4μm) for semiconductor tooling.
Application Areas
In semiconductor manufacturing, spliced boards serve as diffusion furnace liners and wafer carriers, with purity levels meeting SEMI F76 standards. The metallurgy industry uses them for continuous casting dies, where their non-wetting properties prevent aluminum adhesion. Aerospace applications include rocket nozzle inserts and re-entry vehicle thermal protection systems. Emerging uses encompass fuel cell bipolar plates and liquid metal containment, leveraging the material's corrosion resistance against molten salts and alkali metals.
Maintenance and Precautions
For longevity, avoid thermal cycling beyond 200°C/min to prevent microcracking at joints. In oxidizing environments, apply protective coatings like aluminum phosphate when temperatures exceed 400°C. Cleaning should use only deionized water or isopropyl alcohol—abrasives degrade surface integrity. Storage requires RH <60% to prevent moisture absorption (up to 0.5% weight gain in humid conditions), which alters electrical properties. Install with graphite-compatible fasteners (e.g., tantalum or molybdenum) to prevent galvanic corrosion. Regular inspections should check for joint discoloration indicating oxidation penetration.
B2B Procurement Guide
Specify required parameters: thickness tolerance (±0.1mm standard), thermal conductivity directionality (isotropic or anisotropic), and maximum ash content (<300ppm for electronics). Lead times range from 2-6 weeks for custom sizes above 2m². Quality verification should include third-party testing for density homogeneity (ASTM C559) and flexural strength (ISO 18515). For large orders (100+ m²), negotiate MOQ discounts with manufacturers in China (main production hub) or Germany (high-precision suppliers). Packaging must use rigid crates with desiccants to prevent transit damage.
Related Manufacturers
- 主营：吸音棉、隔气膜、玻璃棉、玻璃板、复合板、聚苯板、发泡板、嵌缝板、岩棉板、隔热板、橡塑板、塑料板、璃棉板、火克板、一体板、纤维纸、隔热棉、呼吸纸、珍珠岩、透气纸、透气膜、防火管、针刺毯、保温被、营养土
- 主营：橡塑管、岩棉管、玻璃棉卷毡、橡塑板、岩棉板、玻璃棉板、挤塑板、岩棉复合板、聚能防火板、聚能黑金板、结构一体化保温板、结构一体化板、玻璃棉、硅酸铝针刺毯、玄武岩棉、橡塑制品、岩棉保温、橡塑保温
- 主营：密封垫、吸音棉、通风管、玻璃板、复合板、酚醛板、防水板、悬挂板、海绵板、玄武岩、反光膜、橡塑管、隔音棉、隔气膜、防火纸、电热毯、电焊布、硅胶布、玻璃棉、橡胶皮、纤维纸、隔热棉、呼吸纸、珍珠岩、鸡蛋棉
- 主营：电暖画、碳纤维电暖器、取暖墙、石墨烯发热线、石墨烯电暖器、石墨烯电热板、石墨烯电地暖、墙暖画、取暖画、碳纤维电地暖、碳纤维发热电缆、电暖器代加工、碳纤维电暖画、碳晶墙暖
- 主营：楼地面保温隔声板、泡沫切片、eps泡沫线条