3D Printing Copper Powder

Overview of 3D Printing Copper Powder

3D printing copper powder is a metal powder made of pure copper or copper alloys used as the raw material in various 3D printing technologies for manufacturing end-use copper parts and products.

Some key properties and advantages of using 3D printing with copper powder include:

• High electrical and thermal conductivity desired for electronics applications
• Very high machinability ratings for good finish and post-processing
• Excellent mechanical properties like strength and ductility
• Corrosion resistance due to protective copper oxide layer formation
• Bio-compatible for medical devices and implants
• Cost advantage compared to conventional copper machining

Several metal 3D printing processes utilize copper powder, most commonly:

Types of 3D Printing Using Copper Powder

3D Printing Technology	Description
Binder Jetting	Glues copper powder using liquid binding agents
Directed Energy Deposition (DED)	Uses laser or electron beam to melt copper powder
Selective Laser Melting (SLM)	Selectively laser melts and fuses copper powder bed

These additive manufacturing techniques allow creating complex geometries with copper not feasible by casting or machining. Parts can be fabricate on demand without tooling or molds.

Now let’s take a deeper look into copper grades for 3D printing, properties, applications, specifications, pricing, comparisons and more.

Composition of 3D Printing Copper Powder

There are a few main types of copper metal powders used in additive manufacturing:

Compositions of 3D Printing Copper Powder

Powder Type	Typical Composition
Pure Copper	99.7% Cu minimum
Copper-tin alloy	Cu-10Sn bronze alloy
Copper-nickel alloy	90Cu-10Ni or 70Cu-30Ni

Characteristics of 3D Printed Pure Copper Parts

• Excellent electrical conductivity for electronics
• Ductile material allowing post-processing
• Annealing can further enhance ductility
• Low hardness at 100 HV after printing

Pros

• Highest thermal and electrical conductivity
• Easy to machine, plate, coat post-build
• Bio-compatible for medical uses
• Welding dissimilar metals is simplified

Cons

• Soft low-strength textures and features
• Risk of delamination between layers
• Oxide film formation prone to contamination

Characteristics of 3D Printed Cu-Sn Bronze Parts

• Better mechanical properties with tin alloying
• Up to double the hardness and strength
• Move wear-resistant surface finish
• Higher temperature resistance

Pros

• Stronger parts to resist deformation
• Allows printing fine details and textures
• Small amounts of tin enhance properties
• Good corrosion resistance

Cons

• Lower thermal and electrical conductivity
• Higher density increases weight
• Still require supports during printing

Characteristics of 3D Printed Cu-Ni Alloy Parts

• Excellent combination of strength plus conductivity
• Maintains high ductility and thermal properties
• Adds hardness for wear protection
• Solders well with other copper components

Pros

• Tunable properties balancing strength, hardness and conductivity
• Strong parts able to withstand stress
• Just 10% nickel doubles the yield strength
• Lower melting point benefits lower-temp printing

Cons

• Not bio-compatible for medical devices
• Nickel can initiate galvanic corrosion
• Higher material costs than pure copper

Applications of 3D Printed Copper

Thanks to its versatile material properties, 3D printing with copper powder is used across industries:

Applications of 3D Printing Copper Powder

Industry	Common Applications
Electronics	Interconnects, contacts, terminals, EMI shielding
Electrical	Bus bars, rotor windings, electromagnets
Heat exchangers	Heat sinks, evaporators, condensers
Automotive	Welding tips, bushings, bearings
Architecture	Decorative facades, panels, modeling
Medical	Electrodes,GREENs, implants, surgical tools

Some specific product examples include:

Electronics: Conductive traces, wires, antennae, batteries, sensors

Automotive: Light housings, quick connect fittings, threaded inserts

Aerospace: Brackets, torque control components, radio hardware

Consumer goods: Buttons, closures, zippers, decorative parts

Hardware: Gears, locks, springs, fasteners like nuts and bolts

Leveraging copper’s properties in 3D printing unlocks innovative geometries impossible with subtractive methods that can enhance functionality and efficiency.

Specifications of Copper Metal Powder for 3D Printing

3D printer manufacturers characterize copper powder based on metrics like:

Copper Powder Specifications for 3D Printing

Parameter	Typical Specification Range
Powder shape	Predominantly spherical
Size range	15-45 microns
Min apparent density	3.5 g/cm3
Typical layer thickness	20-100 microns
Flow rate	>=25 sec for 50 g
Residual oxygen	0.3% max

Other important powder measurements:

• Tap density: After settling ranges 4-4.5 g/cm3
• Hall flow rate: Time for 50g powder to flow through funnel aperture
• Hausner ratio: Tap density divided by apparent density indicates flowability

Narrow distribution ensures dense and uniform powder spreading during printing. Low oxygen prevents excess oxides impeding layer bonding.

Copper Metal Powder Prices, Suppliers, and Comparisons

Copper powder costs fluctuate based on market prices, composition, quantity and source location:

Copper Powder Cost Comparison

Type	Average Price Range	Key Suppliers
Pure copper	$50-80 per kg	AP&C, Sandvik Osprey, Carpenter Additive
Cu-10Sn bronze	$55-90 per kg	ECKA Granules, BASF Additive Mfg, LPW Technology
CuNi10 alloy	$65-105 per kg	Linde, Arconic Components, Praxair

Buying high purity grades from certified metal powder manufacturers ensures reliable quality. Overseas suppliers offer lower cost options but can lack consistency.

When comparing copper powder materials for a print job, consider:

Pros and Cons of Different Copper Powders

Type	Pros	Cons
Pure copper	Highest thermal/electrical performance<br>Lowest cost	Soft parts prone to wear<br>Risk of delamination
Cu bronze alloy	Stronger components<br>Better fine detail resolution	Heavier components<br>Lower conductivity
Copper-nickel	Balanced strength plus conductivity <br>Controlled friction/wear	Not bio-compatible<br>More difficult to machine

In summary, pure copper suits electronics needs emphasizing conductivity and ductility at low cost whereas alloys better meet mechanical requirements with higher strength and hardness.

Printing Parameters, Thresholds and Recommendations

Dialing in optimal print settings is key to successfully utilizing copper powder:

Print Profile Settings for Copper Powder

Parameter	Typical Range	Recommendations
Layer thickness	20-100 microns	Thinner layers improve interlayer bonding
Laser power (for SLM)	100-500 W	Higher density and wetting at increased power
Scan speed	100-500 mm/s	Faster speeds reduce heat input and residual stress
Beam size	20-100 microns	Laser diameter close to layer thickness
Support structures	Tree-like	Prevent warping then remove through post-processing
Shielding gas	Argon or nitrogen	Prevent oxidation during builds
Build plate heating	50-250°C	Heatsink once deposited if cooling is too fast
Stress relief	Anneal 1-3 hrs at 400°C	Reduce residual stresses promoting layer integrity
Hot isostatic pressing	1000-10000 psi at 500-950°C	Increase density by collapsing voids
Surface finishing	Tumbling, machining, grinding, polishing etc	Smoothen surface roughness

Monitoring the melt pool size and temperatures aids real-time calibration of laser parameters. Match the energy input to the print area to achieve good fusion without excess heating.

For high quality parts, thermal management is key along with mitigating residual stress through strategic heating/cooling cycles during printing as well as post-build heat treatments. Leverage standard metalworking/machining methods for finishing copper printed components.

Industry Standards for 3D Printing Using Metal Powders

Standards Organizations for Metal Additive Manufacturing

Organization	Relevant Metal AM Standards
ASTM International	F3049, F2971, F3184, F3301 etc. for amenable alloys, process requirements, qualities
International Organization for Standardization (ISO)	ISO/ASTM 52915, 52921 covering design, processes, testing
SAE International	AMS7001A Aerospace material and process specs
American Society of Mechanical Engineers (ASME)	BPVC Section IX Welding codes
National Institute of Standards and Technology (NIST)	Reference copper powder data and measurement science
International Electrotechnical Commission (IEC)	IEC 62890 benchmarking metal powder bed fusion process performance

These share best practices and quantify repeatable performance criteria to qualify parts for end use.

For aerospace and aviation components, additional CAA and FAA standards need compliance as well. Automotive parts also reference UL, A2LA, NADCAP specifications.

In medical device applications, meeting FDA and CE regulations is mandatory before commercialization to ensure biocompatibility and patient safety.

Overall, standards sync technology development across the metal additive manufacturing industry.

FAQs

Q: How to choose the right copper alloy for my application?

A: Most products emphasize either strength, hardness, and wear performance or thermal/electrical conductivity. Tuning the alloying elements like tin or nickel accordingly allows custom property optimization.

Q: Does copper powder require inert gas shielding when printing?

A: Yes, heating copper powder to high temperatures causes surface oxidation losing alloying elements. Shielding with argon or nitrogen prevents excessive material loss.

Q: What causes cracking between layers when 3d printing copper?

A: Differential cooling rates plus alloy shrinkage can introduce stresses leading to interlayer cracks. Better thermal controls during builds and stress-relief heat treatments post-process reduce these defects.

Q: Why does my 3d printed copper part have poor surface finish and texture?

A: Insufficient melting of powder particles from low laser power causes porous uneven textures needing extensive finish machining. Printing calibration, adequate layer overlap and higher energy density improves surface quality.

Q: Is direct metal printing with copper powder very expensive?

A: Yes, both printer system costs running over $100,000 plus recursive metal powder purchases make it prohibitively expensive for small productions. However, cost per part drops significantly for volume production runs due to no tooling requirements.

know more 3D printing processes