Copper foam is a three-dimensional interconnected porous copper material designed for applications requiring efficient heat transfer, electrical conductivity, capillary performance, and a large internal surface area. Also known as Cu foam or copper metal foam, it combines the functional properties of copper with an open porous structure.
What Is Copper Foam?
Copper foam is a three-dimensional porous metal material consisting of a continuous copper framework and interconnected internal pores. Unlike solid copper, which has a dense structure, open-cell copper foam contains numerous connected voids throughout its volume.
This structure allows copper foam to combine metal conductivity with fluid permeability and an extended internal surface area. Its interconnected pores also provide pathways for liquid movement and capillary transport, making it useful in thermal management and other functional engineering systems.
HY Metal Foam describes its copper foam as a three-dimensional interconnected porous copper matrix. Compared with its nickel foam material, the company highlights copper foam's superior thermal and electrical conductivity and good ductility.
Copper Foam vs. Solid Copper vs. Copper Mesh
| Material | Structure | Main Characteristics |
|---|---|---|
| Solid Copper | Dense, non-porous metal | High electrical and thermal conductivity with a continuous solid structure |
| Copper Mesh | Woven or perforated two-dimensional structure | Regular openings and relatively simple sheet construction |
| Copper Foam | Three-dimensional interconnected porous structure | Large internal surface area, permeability, conductivity, and capillary performance |
Copper foam is especially useful when an engineering design requires both a conductive metal framework and interconnected internal pores. The appropriate structure depends on whether the priority is heat transfer, fluid flow, capillary transport, or filtration.
Key Properties and Advantages of Copper Foam
1. High Electrical Conductivity
Copper is widely used in electrical engineering because of its excellent conductivity. In copper foam, the interconnected metallic framework provides conductive pathways throughout the material.
The effective electrical conductivity of porous copper depends on its solid fraction, pore geometry, ligament continuity, and material composition. It is generally lower than that of fully dense copper because the conductive cross-section is reduced by internal pores.
This structure can be considered for conductive substrates, electronic components, and specialized electrochemical systems where a porous architecture is required.
2. Thermal Conductivity and Heat Dissipation
Thermal management is one of HY Metal Foam's documented copper foam application areas. The material is used in heat dissipation structures, vapor chamber capillary wicks, and liquid cooling components.
Its interconnected copper framework supports heat conduction, while the porous geometry provides additional contact area for fluid-based heat exchange.
The effective thermal conductivity of copper foam is different from the intrinsic thermal conductivity of solid copper. It is influenced by porosity, PPI, ligament dimensions, contact resistance, and operating conditions.
3. High Porosity and Specific Surface Area
Copper foam has a three-dimensional cellular structure that provides a large internal surface area relative to its external dimensions.
The open pores can increase contact between the copper framework and working fluids. This is important for heat exchange, capillary transport, and fluid-related applications.
4. Capillary Performance
Capillary transport is a particularly important function of copper foam in vapor chamber applications. The interconnected pore structure supports liquid movement through the porous copper framework.
HY's published configurations include 80 PPI and 150 PPI copper foam for vapor chamber capillary wicks. These designs use high-purity oxygen-free copper and specific thickness and porosity configurations.
The actual capillary performance depends on pore geometry, pore connectivity, material wetting characteristics, working fluid, and system design.
5. Permeability and Fluid Transport
Open-cell copper foam provides interconnected channels through which liquids or gases can move. This makes it suitable for selected cooling, filtration, and fluid-management systems.
Pore size and pore density influence flow resistance. A finer porous structure may provide more internal contact area, but it can also increase pressure drop.
6. Ductility and Structural Characteristics
HY identifies good ductility as one of the characteristics of its copper foam material. However, mechanical performance depends on the actual porous structure, metal ligament dimensions, density, and manufacturing process.
For components subject to compression, vibration, or mechanical loading, buyers should specify the required deformation limits and mechanical test conditions.
Copper Foam Specifications and Technical Parameters
Selecting copper foam requires evaluating more than PPI alone. Purity, porosity, thickness, pore size, bulk density, and performance requirements should be considered together.
Published Copper Foam Application Configurations
The following specifications are taken from HY Metal Foam's published computer-industry material selection information. They are application-specific reference configurations rather than universal specifications for every copper foam order.
| Application | Copper Purity | PPI | Thickness | Porosity |
|---|---|---|---|---|
| Vapor Chamber Capillary Wick | 99.99% Oxygen-Free Copper | 80 / 150 | 1 / 3 mm | 97%–98% |
| GPU Air-Cooled Radiator Filler | Requires confirmation | 60 | 5–8 mm | 96% |
| Liquid-Cooled Cold Plate Filler | Requires confirmation | 100 | 5–12 mm | Requires confirmation |
| Coolant Loop Filtration and Defoaming | Requires confirmation | 40 | Requires confirmation | Requires confirmation |
The liquid-cooling configuration can also use a gradient pore design, with 30 PPI at the water inlet and 100 PPI at the water outlet, according to the intended flow arrangement.
General Copper Foam Procurement Reference
HY's published material selection table also identifies 60, 80, and 100 PPI, 1–20 mm thickness, 95%–98% porosity, and 99.99% oxygen-free copper as reference procurement specifications for copper foam.
| Technical Parameter | Published Information | Purchasing Notes |
|---|---|---|
| Copper Purity | 99.99% oxygen-free copper in published application configurations | Confirm material grade and batch documentation |
| Porosity | 95%–98% procurement reference; application examples include 96% and 97%–98% | Confirm the required porosity and measurement method |
| PPI | 40, 60, 80, 100, and 150 PPI appear in specific copper foam applications | Selection depends on application and pore structure |
| Actual Pore Size | Not fully specified for all copper foam configurations | Request measured pore opening dimensions |
| Thickness | Published copper configurations cover 1–20 mm | Confirm thickness availability for each PPI and geometry |
| Bulk Density | Not published as a copper-specific value | Requires manufacturer measurement or confirmation |
| Surface Density | Not published for copper foam | Requires manufacturer confirmation |
| Open-Cell Rate | No separate copper-specific value published | Confirm pore connectivity and test method |
| Electrical Conductivity | Qualitative material advantage described | Numerical test results require confirmation |
| Effective Thermal Conductivity | No numerical copper foam value published | Confirm measurement conditions and test data |
| Compressive Strength | Not published | Requires mechanical testing |
| Available Dimensions | 100 × 100 × 100 mm one-piece copper foam cube documented | Other dimensions require project evaluation |
HY's overall porous metal product portfolio lists a PPI range of 5–150 PPI. This is a portfolio-wide reference, not a guarantee that every copper foam configuration is available throughout that range.
Understanding Copper Foam Density
Bulk density and solid copper density are not interchangeable. Solid copper density describes the fully dense metal, while copper foam bulk density includes both the copper framework and internal voids.
For an idealized foam made from a single solid material, the relationship can be expressed as:
Bulk Density = Solid Copper Density × (1 − Porosity)
For example, increasing porosity generally reduces bulk density when the external volume and copper composition remain unchanged.
Actual measured density depends on the material structure, manufacturing consistency, surface condition, and measurement method. Buyers should request the measured value when density is a critical design parameter.
Copper Foam Porosity vs. PPI vs. Pore Size
Porosity, PPI, and actual pore diameter are different structural parameters. They should not be treated as interchangeable when specifying copper foam.
What Is Copper Foam Porosity?
Porosity describes the proportion of void volume within the overall volume of the material.
Higher porosity generally reduces bulk density and increases the available void space. However, it does not automatically indicate better permeability, thermal performance, or mechanical strength.
What Does PPI Mean?
PPI stands for pores per inch. It indicates the number of cellular pores counted along one linear inch of the foam structure.
Higher PPI generally indicates a finer cellular structure, while lower PPI generally indicates larger cell spacing.
What Is Actual Pore Size?
Actual pore size refers to the measurable opening within a pore. It is affected by the cell geometry and the thickness of the surrounding metal ligaments.
The nominal cell pitch can be estimated using:
Nominal Cell Pitch (mm) = 25.4 / PPI
This value is not the actual pore opening. The copper ligaments occupy part of the cellular space, and the actual opening must be measured separately.
| Parameter | Meaning | Engineering Importance |
|---|---|---|
| Porosity | Percentage of void volume | Bulk density and available internal space |
| PPI | Number of pores per linear inch | Relative cellular fineness |
| Actual Pore Size | Measured pore opening | Capillary performance and fluid passage |
| Ligament Thickness | Thickness of the copper framework | Conductivity and structural integrity |
A higher PPI does not necessarily produce better performance. For example, finer pores may improve capillary characteristics in certain vapor chamber designs, but they may also increase flow resistance in liquid cooling systems.
The optimal combination should be determined according to the working fluid, flow conditions, operating temperature, and required thermal performance.
How to Choose the Right Copper Foam Specifications
The correct copper foam specification depends on the intended engineering application. HY Metal Foam's published computer-industry solutions provide several practical examples.
| Application | HY Published Configuration | Main Selection Priorities |
|---|---|---|
| GPU Vapor Chambers | 80 / 150 PPI, 1 / 3 mm, 97%–98% porosity | Capillary performance, purity, pore structure, and thermal contact |
| GPU Air-Cooled Radiator Ducts | 60 PPI, 5–8 mm, 96% porosity | Airflow, heat exchange area, and installation dimensions |
| Liquid Cooling Cold Plates | 100 PPI, 5–12 mm, gradient pore design | Fluid distribution, heat transfer, pressure drop, and pore uniformity |
| Coolant Loop Filtration | 40 PPI copper foam | Particle retention, flow resistance, and working-fluid compatibility |
Battery and Electrochemical Applications
HY's overall porous metal portfolio also addresses new energy storage and electrochemical applications. However, the company's published material information does not establish one universal copper foam electrode specification.
For battery or electrochemical projects, purchasers should confirm copper compatibility with the electrolyte, electrode chemistry, coating requirements, corrosion conditions, and electrical contact design before choosing the material.
Thermal Management Applications
For heat exchangers, vapor chambers, and liquid cooling components, buyers should prioritize thermal performance, pore structure, PPI, porosity, thickness, and pressure drop.
A high-PPI design may provide useful capillary characteristics, while a different pore configuration may be more appropriate for fluid circulation. The working conditions should determine the selection.
Filtration Applications
For filtration and coolant-loop applications, actual pore openings, pore connectivity, pressure drop, and cleaning requirements are particularly important.
PPI alone cannot determine particle retention or filtration efficiency. Buyers should provide the target particle size and working-fluid requirements.
Custom Copper Foam Sizes, Shapes and Manufacturing Capabilities
Standard copper foam sheets are not sufficient for every engineering application. Some projects require thick porous structures, integrated blocks, customized pore distributions, or irregular component geometries.
HY Metal Foam has more than two decades of technical development in porous metal materials. The company's manufacturing capabilities include foam metal substrate preparation, alloy composite development, large-scale one-piece molding, and machining of irregularly shaped components.
HY Metal Foam's Copper Foam Development Milestone
In 2012, HY successfully developed a 100 × 100 × 100 mm one-piece copper foam cube through its three-dimensional forming technology.
This development represents an important copper-specific milestone in the company's technical history and demonstrates experience with three-dimensional porous copper structures beyond conventional thin sheets.
HY's wider porous metal development history also includes:
- 2003: Development of thick foam metal panels exceeding 1 inch in thickness.
- 2012: Development of a 100 × 100 × 100 mm integrated copper foam cube.
- 2022: Development of an extra-long foam metal cylinder exceeding 5,000 mm in length.
The first and third milestones concern the broader porous metal manufacturing portfolio and should not be interpreted as standard copper foam product dimensions.
Customization and Production Support
HY's broader manufacturing portfolio supports several product forms and technical processes:
- Porous metal sheets: Sheet materials for equipment integration and thermal management projects.
- Porous metal blocks: Three-dimensional components and integrated structures.
- Large-format molding: One-piece porous structures for non-standard projects.
- Irregular components: Machining and customization based on engineering drawings.
- Composite materials: Alloy and composite porous material development.
- Prototype development: Material evaluation and sample preparation before production.
The availability of each product form in copper foam should be confirmed according to the required geometry, thickness, pore structure, and production quantity.
HY provides material testing, prototype development, small- and medium-volume production, and large-scale manufacturing support.
Copper Foam vs. Nickel Foam
Copper foam and nickel foam are both three-dimensional porous metal materials. Their material characteristics make them suitable for different engineering priorities.
| Comparison | Copper Foam | Nickel Foam |
|---|---|---|
| Electrical Conductivity | Higher conductivity according to HY's material comparison | Good electrical conductivity |
| Thermal Conductivity | Higher thermal conductivity according to HY's material comparison | Good thermal properties |
| Ductility | HY identifies good ductility | Depends on material structure and manufacturing process |
| Porous Structure | Three-dimensional interconnected copper framework | Three-dimensional porous nickel framework |
| Application Focus | Vapor chambers, heat dissipation, liquid cooling capillary wicks | Selected energy storage, electromagnetic shielding, and other functional applications |
Neither material is universally better. Copper foam is particularly attractive when conductivity and capillary performance are important. Nickel foam may be considered for applications where nickel-based material characteristics are preferred.
For projects involving aggressive working media, corrosion performance should be evaluated under actual operating conditions rather than assumed from the material name alone.
Explore HY Metal Foam's porous metal materials to learn more about nickel foam, copper-nickel foam, nickel-chromium-aluminum foam, and other available material options.
How to Order Copper Foam
Providing clear technical requirements helps HY evaluate the appropriate copper foam structure and prepare a more accurate quotation.
- Application: Describe the intended use, such as a vapor chamber, cooling component, or filtration system.
- Copper Purity: Specify whether high-purity oxygen-free copper, such as the published 99.99% configuration, is required.
- PPI: Provide your preferred pore density or reference configuration.
- Porosity: Specify the target void fraction if defined in your engineering design.
- Pore Size: Provide the required actual pore opening where applicable.
- Thickness and Dimensions: Provide length, width, thickness, shape, and dimensional tolerances.
- Performance Requirements: Describe thermal conductivity, electrical conductivity, capillary performance, permeability, or mechanical requirements.
- Quantity: Provide prototype quantity and estimated mass-production demand.
If you do not have all technical parameters, you can provide an engineering drawing, existing sample, or application description for an initial evaluation.
Frequently Asked Questions About Copper Foam
1. What Is Copper Foam Used For?
Copper foam is used in vapor chamber capillary wicks, GPU cooling systems, liquid cooling components, heat dissipation structures, and selected coolant-loop filtration applications. HY also publishes copper foam configurations for advanced thermal management.
2. What Is the Typical Porosity of Copper Foam?
HY's published copper foam procurement reference lists 95%–98% porosity. Specific examples include 96% for an air-cooled radiator configuration and 97%–98% for vapor chamber capillary wicks. The actual requirement depends on the application.
3. What Does PPI Mean in Copper Foam?
PPI means pores per inch. It describes the number of pores counted along a linear inch of the cellular structure. HY publishes copper foam application configurations including 40, 60, 80, 100, and 150 PPI.
4. Does Higher PPI Mean Better Copper Foam?
No. Higher PPI generally indicates a finer cellular structure, but performance depends on the application. A higher PPI may benefit certain capillary designs, while a different pore density may be preferable for fluid flow and pressure-drop requirements.
5. What Thicknesses Are Available for HY Copper Foam?
HY's published copper foam configurations include thicknesses from 1 mm to 20 mm. Specific application examples include 1–3 mm for vapor chamber capillary wicks, 5–8 mm for air-cooled radiator fillers, and 5–12 mm for liquid cooling components. Availability depends on the selected PPI and component design.
6. Can HY Customize Copper Foam Into Different Shapes and Sizes?
HY has documented the development of a 100 × 100 × 100 mm one-piece copper foam cube. The company also provides wider porous metal manufacturing capabilities, including large-scale molding and irregular component machining. Specific copper foam shapes and dimensions require engineering evaluation.
7. What Information Is Needed to Request a Copper Foam Quotation?
Provide the application, copper purity, PPI, porosity, actual pore size, thickness, dimensions, performance requirements, and order quantity. Drawings, samples, and operating conditions are helpful for technical assessment.
Request a Custom Copper Foam Solution
Choosing the correct copper foam involves balancing material purity, PPI, porosity, pore size, thickness, and working conditions.
HY Metal Foam specializes in porous metal material research, customized manufacturing, large-scale forming, and three-dimensional porous structures. With documented experience in one-piece copper foam development and advanced porous metal production, HY supports projects from prototype evaluation to volume manufacturing.
Whether you need 99.99% high-purity copper foam for a vapor chamber, a customized structure for liquid cooling, or a non-standard porous copper component, our team can review your application requirements.
Send your technical drawings, samples, dimensions, or product specifications to discuss your project with HY Metal Foam.
Contact HY Metal Foam for technical consultation and a customized copper foam quotation.
