CoCrMoW-pulver

Overview of CoCrMoW Powder

CoCrMoW-pulver är ett pulver av legeringen kobolt-krom-molybden-volfram som främst används för tillverkning av ortopediska ledimplantat. Tillsatsen av volfram förbättrar ytterligare hållfastheten, slitstyrkan och hårdheten jämfört med CoCrMo-legeringar.

Key properties and advantages of CoCrMoW powder include:

CoCrMoW Powder Properties and Characteristics

Fastigheter	Detaljer
Sammansättning	Co-Cr-Mo-W alloy
Täthet	9.2 g/cc
Partikelns form	Sfärisk
Storleksintervall	15-45 mikrometer
Skenbar densitet	Upp till 60% av verklig densitet
Flytbarhet	Bra
Korrosionsbeständighet	Excellent due to Cr oxide layer
Biokompatibilitet	High, suitable for implants
Wear resistance	Extremely good from W and Cr
Styrka	Very high from solid solution strengthening

With its unique combination of biocompatibility, high hardness, strength and toughness, CoCrMoW enables manufacturing of high performance orthopedic implants using 3D printing or metal injection molding.

CoCrMoW Powder Composition

CoCrMoW Powder Composition

Element	Vikt %
Kobolt	Balans
Krom	26-30%
Molybden	5-7%
Volfram	4-6%
Kol	< 0.35%
Mangan	< 1%
Kisel	< 1%
Järn	< 1%
Nickel	< 1%

• Cobalt provides strength, biocompatibility, aids solid solution strengthening
• Chromium for oxidation resistance and corrosion resistance
• Molybdenum contributes to solid solution strengthening
• Tungsten significantly improves wear resistance and hardness
• Other elements present as impurities

The high Cr, Mo and W content result in an excellent combination of strength, hardness and corrosion resistance required for orthopedic implants.

CoCrMoW Powder Physical Properties

CoCrMoW Powder Physical Properties

Fastigheter	Värden
Täthet	9.2 g/cc
Smältpunkt	1370-1430°C
Elektrisk resistivitet	96 μΩ-cm
Termisk ledningsförmåga	16 W/mK
CTE	14.5 x 10^-6 K^-1
Curie-temperatur	1160°C

• High density compared to CoCrMo and titanium alloys
• Maintains strength and hardness at elevated temperatures
• Relatively low thermal conductivity
• Becomes paramagnetic above Curie temperature
• CTE higher than competing alloys in implant applications

The properties allow use in load bearing orthopedic implants requiring high temperature strength, hardness and corrosion resistance.

CoCrMoW Powder Mechanical Properties

CoCrMoW Powder Mechanical Properties

Fastigheter	Värden
Hårdhet	43-52 HRC
Draghållfasthet	1310-1650 MPa
Sträckgräns	1035-1450 MPa
Töjning	8-15%
Elasticitetsmodul	240-310 GPa
Tryckhållfasthet	1700-2100 MPa

• Excellent combination of very high strength and hardness
• Strength levels exceed requirements for load bearing implants
• Reasonable ductility for a hard material
• High modulus provides stiffness required for implants
• High fatigue strength ensures durability

The mechanical properties make CoCrMoW powder highly suitable for manufacturing strong, wear resistant orthopedic implants using AM techniques.

CoCrMoW Powder Applications

Primary applications of CoCrMoW powder include:

CoCrMoW Powder Applications

Tillämpning	Exempel
Orthopedic implants	Knee, hip, dental implants
Medicintekniska produkter	Surgical tools and instruments
Flyg- och rymdindustrin	Aircraft engine components
Fordon	Fuel injection parts, valves
Industriell	Cutting tools, dies, molds

Some specific product uses of CoCrMoW alloy powder:

• Articulating surfaces in joint replacement implants
• Dental crowns, bridges and root caps
• Maxillofacial implants, skull plates
• Aircraft engine turbine blades and housings
• Automotive engine valves and fuel injection nozzles
• Cutting tools and industrial tooling

The combination of outstanding mechanical properties, corrosion resistance and biocompatibility provides maximum performance for these demanding applications.

CoCrMoW Powder Specifications

Key standards for CoCrMoW powder:

CoCrMoW Powder Standards

Standard	Beskrivning
ASTM F75	Standard for wrought CoCrMo alloy for surgical implants
ASTM F1537	Wrought CoCrMoNi alloy for dental applications
ASTM F3001	Specification for additive manufacturing of medical implants using powder bed fusion
ISO 5832-4	Wrought CoCrMoNi alloy for surgical implants

These standards specify:

• Limits on composition, impurities
• Minimum mechanical property requirements
• Production method – inert gas atomization
• Acceptabel partikelstorleksfördelning
• Testing protocols for quality assurance
• Powder characterization requirements

Compliance with standards ensures suitability for critical orthopedic implant applications.

CoCrMoW Powder Particle Size

CoCrMoW Powder Particle Size Distribution

Partikelstorlek	Egenskaper
15-25 mikrometer	Used in laser powder bed fusion (LPBF)
25-45 mikrometer	Used in binder jetting and DMLS
10-45 microns	Used in metal injection molding

• Finer powder provides higher resolution and surface finish for AM
• Coarser powder has better flowability for powder processing
• Balanced size distribution optimized for each production method
• Tight control over particle size distribution is maintained

Controlling particle size and morphology allows high packing density and optimized sintering.

CoCrMoW Powder Apparent Density

CoCrMoW Powder Apparent Density

Skenbar densitet	Egenskaper
Upp till 60% av verklig densitet	För sfärisk pulvermorfologi
4.5-5.5 g/cc range	På grund av tomrum mellan partiklarna

• Högre skenbar densitet förbättrar pulverflöde och kompressibilitet
• Spherical powder shape allows greater packing density
• Values up to 65% are possible with optimized powder

Higher apparent density results in better manufacturing productivity and part quality.

CoCrMoW Powder Production Method

CoCrMoW Powder Production

Metod	Detaljer
Atomisering av gas	High pressure inert gas breaks up molten alloy stream into fine droplets
Induktionssmältning i vakuum	High purity starting materials melted under vacuum
Flera omsmältningar	Förbättrar den kemiska homogeniteten
Siktning	Klassificerar pulver i olika fraktioner av partikelstorlek
Blandning	Powder fractions blended to customize particle distribution

• Gas atomization produces fine spherical powder morphology
• Vacuum melting minimizes impurities like oxygen and nitrogen
• Multiple remelting improves uniformity of composition
• Post-processing allows precise control of particle size distribution

Fully automated production and strict process control ensures reliable properties and batch-to-batch consistency of the powder.

CoCrMoW Powder Pricing

CoCrMoW Powder Pricing

Faktor	Påverkan
Pulverkvalitet	Price increases with higher purity
Partikelstorlek	Ultrafine grades more expensive
Orderkvantitet	Prisreduktion för bulkbeställningar
Powder properties	Higher apparent density costs more
Förpackning	Argon filled containers raise price
Testing requirements	More rigorous testing increases cost
Ledtid	Faster delivery times increase cost

Indikativ prissättning

• CoCrMoW for medical applications: $120-180 per kg
• CoCrMoW for industrial applications: $80-120 per kg

Significantly lower prices are applicable for bulk orders exceeding several hundred kilograms.

CoCrMoW Powder Suppliers

CoCrMoW Powder Suppliers

Företag	Plats
Snickare Tillsats	USA
Sandvik Osprey	STORBRITANNIEN
Hoganas	Sverige
Praxair	USA
AP&C	Kanada
Erasteel	Frankrike

Key selection factors:

• Range of powder grades and particle sizes
• Produktionskapacitet och ledtider
• Powder quality and consistency
• Compliance with medical standards
• Pricing and minimum order quantity
• Inspection, testing and QA processes

CoCrMoW Powder Handling and Safety

CoCrMoW Powder Handling

Rekommendation	Anledning
Undvik inandning	To prevent lung tissue damage from fine particles
Use protective mask and gloves	Prevent accidental ingestion through nose/mouth
Handle in well ventilated areas	Reduce airborne particle circulation
Use appropriate protective clothing	Minimera hudkontakt
Se till att inga antändningskällor finns i närheten	Pulver kan antändas i syrehaltig atmosfär
Följ antistatiska protokoll	Prevent fire due to static discharge while handling
Använd verktyg som inte slår gnistor	Avoid possibility of ignition
Store in sealed containers in cool, dry area	Prevent contamination and oxidation

Although CoCrMoW powder is relatively inert, recommended precautions should be taken for safe handling and processing.

CoCrMoW Powder Inspection and Testing

CoCrMoW Powder Testing

Test	Detaljer
Kemisk analys	ICP spectroscopy used to verify composition
Analys av partikelstorlek	Determines particle size distribution
Skenbar densitet	Measured using Hall flowmeter as per ASTM B212
Morfologi för pulver	Imaging analysis via SEM to check particle shape
Flow rate testing	Determines flowability through a standardized funnel
Tap density testing	Densitet uppmätt efter mekanisk knackning av pulverprov

Rigorous testing ensures compliance with specifications like ASTM F75 and consistent powder suitable for orthopedic implant manufacturing.

CoCrMoW Powder Storage and Handling

CoCrMoW Powder Storage

Faktor	Effekt
Luft, syre	Risk of oxidation at high temperatures
Fukt	Låg korrosionshastighet vid rumstemperatur
Organiska lösningsmedel	Can absorb solvents and stain powder
Acids, alkalis	Resistant to mild acids and bases
Förhöjda temperaturer	Increased reactivity and oxidation in air
Contamination	Can affect flowability, sintering ability

Rekommendationer:

• Store sealed in inert gas purged containers
• Maintain below 30°C temperature
• Avoid contact with oxidizing acids and chlorinated solvents
• Open containers only in controlled environments

With proper precautions, CoCrMoW powder exhibits excellent stability during handling and storage.

Comparison With CoCrMo Powder

CoCrMoW vs CoCrMo Powder

Parameter	CoCrMoW	CoCrMo
Täthet	9.2 g/cc	8.3 g/cc
Hårdhet	43-52 HRC	35-45 HRC
Draghållfasthet	1310-1650 MPa	1170-1510 MPa
Wear resistance	Utmärkt	Mycket bra
Korrosionsbeständighet	Utmärkt	Utmärkt
Biokompatibilitet	Hög	Hög
Kostnad	Hög	Måttlig
Användningsområden	Orthopedic implants, aerospace	Orthopedic implants, dental

• CoCrMoW has significantly higher strength and hardness
• CoCrMoW provides better wear resistance
• Both offer excellent corrosion resistance and biocompatibility
• CoCrMoW is more expensive due to W addition
• CoCrMoW preferred for knee, hip implants; CoCrMo for dentistry

The tungsten addition gives CoCrMoW superior mechanical properties than conventional CoCrMo alloys.

CoCrMoW Powder Pros and Cons

Advantages of CoCrMoW Powder:

• Excellent strength, hardness and wear resistance
• High biocompatibility and corrosion resistance
• Good high temperature properties
• Can be processed via AM or MIM techniques
• Suitable for load-bearing orthopedic implant applications
• Provides attractive aesthetic appearance

Limitations of CoCrMoW Powder:

• More expensive than CoCrMo and stainless steel powders
• Lower ductility and fracture toughness
• Requires protective atmosphere during processing
• Difficult to machine final components
• Limited joinability and weldability
• Release of Co ions raises health concerns

CoCrMoW Powder FAQs

Q: What are the main applications of CoCrMoW powder?

A: The primary applications are knee and hip joint replacement implants, dental restorations like crowns and bridges, maxillofacial implants, and aerospace components like turbine blades.

Q: How does tungsten addition improve the properties of CoCrMo alloy?

A: Tungsten significantly increases strength, hardness and wear resistance through solid solution strengthening and formation of stiff carbides. This results in excellent performance for load bearing implants.

Q: What precautions are needed when handling CoCrMoW powder?

A: Recommended precautions include using protective mask, gloves, clothing, handling in ventilated areas, avoiding ignition sources, controlling static discharge, using non-sparking tools, and storing sealed containers in a cool, dry place.

Q: What are the key differences between CoCrMoW grades for medical and industrial uses?

A: Medical grades have higher purity, lower impurities, controlled particle size distribution, undergo more rigorous testing, and are produced under stringent quality control to meet standards for biomedical implants.