Carbon graphite components enable reliable operation in demanding high heat and friction applications. With exceptional properties like high temperature and chemical resistance, carbon graphite is an extraordinarily versatile engineered material.
Here’s an overview of carbon graphite part types, benefits, common applications, and guidance on selecting the optimal material grade for your operational needs.
Introduction
Carbon graphite parts refer to components made from a carbon and graphite composite material manufactured via the high-temperature treatment of carbon-rich organic precursors. The resulting material offers an exceptional combination of properties:
- Withstands temperatures up to 6450°F (3565°C)
- Extremely strong and durable
- Resistant to thermal shock and chemical corrosion
- Self-lubricating and low friction
- Low thermal expansion
These attributes make carbon graphite the material of choice for applications with high heat, thepressedge friction, and demanding operational environments. The types of carbon graphite components serve critical functions across industries, from aerospace and automotive to chemical processing and electronics manufacturing.
The Different Types of Carbon Graphite Parts
There are several specialized types of carbon graphite materials used for components and parts:
Isotropic Graphite
With uniform structure and properties in all directions, isotropic graphite provides excellent thermal shock resistance and low gas permeability. Typical applications include heat exchangers, susceptors, and wafer carriers in semiconductor manufacturing equipment.
Extruded Graphite
Extruded graphite parts have aligned graphite flakes, resulting in higher strength along the extrusion direction. Suitable applications include seals, bearings, electrodes, and heating element components.
Molded Graphite
Offering good machinability, molded graphite can be manufactured in complex component shapes. Common uses include seals, impellers, and jigs.
Pyrolytic Graphite
This exceptionally thermally conductive material is used for wafer chucks in semiconductor fabrication equipment.
Carbon-Carbon Composite
Carbon-carbon composites combine carbon fiber reinforcement with a carbon matrix for an ultra-lightweight and strong material able to withstand extreme temperatures. Applications include aircraft brakes, rocket nozzles, and furnace linings.
The Benefits of Using Carbon Graphite Components
The unique properties of carbon graphite offer distinct advantages. These include:
Outstanding High-Temperature Resistance
With extremely high melting points, they reliably operate at temperatures up to 6450°F (3550°C). This makes them suitable for furnace linings, reentry vehicles, and processing equipment.
Excellent Thermal Shock Resistance
The low coefficient of thermal expansion minimizes destructive thermal stresses during rapid temperature changes. This enables reliable performance despite thermal cycling.
High Strength at Elevated Temperatures
Carbon graphite maintains strength and rigidity at high operating temperatures. This allows the design of exceptionally strong yet lightweight components. sightwiki
Superior Friction and Wear Properties
The graphite in carbon graphite offers a lubricious surface that minimizes wear while maintaining dimensional stability better than PTFE at extreme temperatures. Thus, they are suitable for bearings and seals.
Chemical and Corrosion Resistance
Carbon graphite withstands chemical attack from most acids, alkalis, and solvents for reliable performance in chemically aggressive environments like semiconductor fabrication chambers.
Self-Lubricating Capability
The layered graphitic structure enables the parts to operate without oil or grease lubricants that decompose at high temperatures.
Resistant To Heat Distortion
Minimal thermal expansion reduces component heat distortion, enabling precision carbon graphite parts for applications like wafer chucks.
Key Applications and Use Cases
Their exceptional properties make the parts suitable for:
Bearings and Bushings
Offering low-friction and self-lubrication, carbon graphite bearings and bushings operate reliably at high temperatures inside materials processing kilns, steel rolling mills, and furnace conveyors.
Mechanical Seals and Gaskets
With excellent chemical resistance, carbon graphite seals withstand aggressive chemicals at extreme temperatures and pressure inside pipes and pumps.
Furnace Linings, Fixtures, and Insulation
Carbon-carbon composites reliably withstand ultra-high temperatures inside rocket nozzles, hypersonic vehicles, and furnace chambers.
Electrodes
High-temperature extruded graphite electrodes withstand molten metals and corrosive gases inside industrial furnaces and plasma arc welding equipment.
Heating Elements
The superior thermal shock resistance allows carbon graphite heating elements to quickly reach extreme temperatures without cracking inside industrial heat treatment furnaces.
Semiconductor Manufacturing Components
Ultra-high purity grades withstand harsh chemical environments and temperature cycling inside CVD chambers and other semiconductor fabrication processes.
Brake Components
Carbon-carbon aircraft brake discs combine high strength and heat dissipation capabilities required for commercial and military aircraft.
How To Select the Optimal Carbon Graphite Material
With so many types and grades available, consider these key parameters:
Operational Temperatures
Determine peak temperatures, thermal cycling, and requirements for thermal shock resistance. This establishes maximum service temperatures.
Operating Environment
Determine exposure to oxidizing or inert atmospheres and any corrosive chemical compatibilities needed.
Mechanical Loads
Operating loads, vibration, friction, and wear requirements dictate material strength, hardness, and lubricity needs.
Thermal Conductivity
Required heat transfer rates impact thermal conductivity needs.
Electrical Resistivity
Electrical resistivity requirements dictate material grade selections for applications like heating elements or conductive bearings.
Machinability
Complex shapes require readily machinable grades. Harder grades offer superior wear resistance.
Manufacturing Method
Molding offers complex shapes. Extrusion aligns graphite flakes, improving seal performance.
Purity Levels
Electronics applications often mandate ultra-high purity grades to minimize contamination.
Evaluating key parameters facilitates the selection of the optimal carbon graphite material grade for your operating requirements. Partnering with an expert manufacturer provides access to material science and engineering resources to identify the best material solution.
Carbon Graphite Can Be Used in Various Operating Environments
With extraordinary capabilities to withstand the most severe operating environments, they serve numerous critical applications across a diverse range of industries. The specialized grades and manufacturing methods of carbon graphite materials enable optimized performance, longevity, and reliability for components operating at extreme temperatures.
Discuss Your Project Requirements With a Trusted Manufacturer
By understanding the unique benefits of each carbon graphite type and considering key selection criteria, you can determine the ideal material for your specific application needs. Leveraging the expertise of an experienced carbon graphite parts manufacturer will enable you to fully harness the capabilities of this exceptionally versatile engineered material.
Get in touch today to learn more about your manufacturer’s carbon graphite bushings, bearings, and specialty components, with capabilities like custom machining and same-day service.
