Spherical CoCrMo Alloy Powder Description
Cobalt-based powder refers to hard alloy powder which can resist corrosion, oxidation and high temperature. With elements Cr and Mo, made the WC powder can be used in spray welding and overlayed welding. Biomedical applications such as implant joints and artificial teeth are also suits for the product.
Spherical CoCrMo Alloy Powder Specification
|
Element
|
Min
|
Max
|
Unit
|
|
Cr
|
27.0
|
30.00
|
%
|
|
Mo
|
5.0
|
7.00
|
%
|
|
Al
|
|
0.10
|
%
|
|
B
|
|
0.01
|
%
|
|
C
|
|
0.02
|
%
|
|
Fe
|
|
0.75
|
%
|
|
Mn
|
|
1.00
|
%
|
|
N
|
|
0.25
|
%
|
|
Ni
|
|
0.10
|
%
|
|
O
|
|
0.05
|
%
|
|
P
|
|
0.02
|
%
|
|
S
|
|
0.01
|
%
|
|
Si
|
|
1.00
|
%
|
|
Ti
|
|
0.10
|
%
|
|
W
|
|
0.20
|
%
|
|
Co
|
balance
|
|
|
Spherical CoCrMo Alloy Powder Properties
In CoCrMo alloy powder, the chromium content typically ranges from 26% to 30%, and the molybdenum content is between 5% and 7%, along with small amounts of elements such as carbon, silicon, and nickel. This composition design imparts the alloy with outstanding overall properties, particularly in terms of biocompatibility and mechanical performance.
- Excellent Mechanical Properties: The ultimate tensile strength of CoCrMo alloy can reach 1260 ± 100 MPa. In 3D-printed parts, the powder can also achieve approximately 1000 MPa after heat treatment. This value far exceeds that of many commonly used metallic materials and is twice that of 316L stainless steel.
- Exceptional Corrosion Resistance: Chromium enables the formation of a dense Cr₂O₃ passive film on the alloy surface, which prevents contact between external corrosive media and the interior of the alloy. The addition of molybdenum further enhances the alloy's resistance to pitting corrosion.
- Biocompatibility: The dense and stable passive oxide film (Cr₂O₃) formed by CoCrMo alloy in the body effectively prevents further corrosion of the alloy matrix and the release of metal ions into surrounding tissues, thereby avoiding severe immune reactions and toxicity.
- High-Temperature Strength: Cobalt’s inherent stability, combined with molybdenum's reinforcement, ensures excellent mechanical properties even at elevated temperatures, making it suitable for thermal and high-stress applications.
- Wear and Abrasion Resistance: The addition of silicon and molybdenum contributes to low-stress abrasion and adhesive wear resistance, ensuring longevity in components exposed to friction.
- Good Toughness and Rigidity: The material retains strength and rigidity under mechanical stress, ensuring reliable performance in demanding conditions.
- Thermal Fatigue Resistance: The alloy resists deformation and fatigue under cyclic thermal stress and is suitable for applications involving temperature fluctuations.
Spherical Cobalt-Based Powder Applications
-
Medical Implants: Used for 3D printed joints, dental crowns, and surgical tools due to its biocompatibility, high strength, and wear resistance.
-
Aerospace: Ideal for turbine seals and combustion chamber liners where high-temperature strength and oxidation resistance are critical.
-
Mold Manufacturing: Extends mold life with exceptional wear resistance and thermal stability.
-
Wear-Resistant Coatings: Protects components in demanding environments from abrasion and degradation.
Spherical CoCrMo Alloy Powder Suitable Printing Processes
-
SLM (Selective Laser Melting): Powder with a particle size of 15–53 μm is recommended, as it is the most versatile specification, ensuring good powder spreading and printing accuracy.
-
EBM (Electron Beam Melting): Coarser powders in the ranges of 45–105 μm or 75–150 μm are recommended, as they are more suitable for the powder spreading and processing in high-vacuum environments typical of EBM.
-
LMD (Laser Metal Deposition): Coarse powder in the range of 75–150 μm is recommended to ensure good flowability and powder feeding stability.
CoCrMo vs Ti-6AI-4V vs 316Lstainless steel vs CoNiCrMo
|
Property
|
CoCrMo
|
Ti-6Al-4V
|
316L Stainless Steel
|
CoNiCrMo
|
|
Biocompatibility
|
Excellent
|
Outstanding
|
Good (Limited term)
|
Outstanding
Superior corrosion resistance
|
|
Specific Strength
|
High
|
Very High
|
Low
|
High
|
|
Wear Resistance
|
Excellent
|
Moderate
|
Moderate
|
Excellent
|
|
Corrosion Resistance
|
Excellent
|
Outstanding
|
Good
|
Outstanding (Superior to CoCrMo)
|
|
Hardness
|
High
|
Moderate
|
Low
|
Very High
|
Spherical Cobalt-Based Powder Packing
Spherical powders are typically packaged in vacuum aluminum foil bags or filled with inert gas (Ar).
-500 g/bag
-20 kg/Metal can
-100 kg and more / Steel drum, or customized
All packaging materials are suitable for air, sea and road freight.
