Description

Overview Of CP-Ti

CP-Ti metal powder refers to commercially pure titanium powder (≥99.5% Ti) which is categorized into four grades (Grade 1 to Grade 4) based on purity levels, used in additive manufacturing, powder metallurgy, and biomedical applications. Known for its excellent biocompatibility, corrosion resistance, and moderate mechanical strength, CP-Ti is widely employed in aerospace, medical implants, and industrial tooling。

Grade 1 CP-Ti

Physical Properties:  

● Density: 4.51 g/cm³

● Thermal conductivity: 17–21 W/m·K

● Elastic modulus: 105–110 GPa

Mechanical Properties:  

● Tensile strength: 240–370 MPa

● Yield strength: 170–310 MPa

● Elongation: 24–30%

Key Characteristics:  

● Purity: Highest purity (≥99.5% Ti) with minimal oxygen (≤0.18 wt%) and iron (≤0.20 wt%) content.

Applications:  

● Biomedical implants (e.g., dental screws) due to exceptional biocompatibility.

● Chemical processing equipment requiring high corrosion resistance.

Grade 2 CP-Ti

Physical Properties:  

● Density: 4.51 g/cm³

● Thermal expansion coefficient: 11.7–12.3 × 10⁻⁶/°C (20–400°C).

Mechanical Properties:  

● Tensile strength: ≥540 MPa

● Yield strength: ≥485 MPa*

● Elongation: ≥21%.

Key Characteristics:  

● Composition: Slightly higher oxygen (≤0.25 wt%) and iron (≤0.30 wt%) compared to Grade 1.

Applications:  

● Aerospace components (ASTM B863 compliant).

● Additive manufacturing (AM) for molds and medical devices due to high recyclability and low oxygen content.

Grade 3 CP-Ti

Physical Properties:  

● Density: 4.51 g/cm³

● Thermal conductivity: 16–20 W/m·K

Mechanical Properties:  

● Tensile strength: ≥620 MPa

● Yield strength: ≥550 MPa

● Elongation: ≥18%.

Key Characteristics:  

● Composition: Higher oxygen (≤0.35 wt%) and iron (≤0.30 wt%) for enhanced strength.

Applications:  

● Structural parts in marine and chemical industries.

● AM components requiring moderate strength-to-ductility balance.

Grade 4 CP-Ti

Physical Properties:  

● Density: 4.51 g/cm³

● Elastic modulus: 110–115 GPa

Mechanical Properties:  

● Tensile strength: ≥740 MPa

● Yield strength: ≥680 MPa

● Elongation: ≥15%

Key Characteristics:  

● Composition: Highest oxygen content (≤0.40 wt%) among CP-Ti grades, with iron ≤0.50 wt%.

Applications:  

● High-stress components in aerospace and automotive sectors.

● Surgical implants requiring high strength but limited by stress shielding concerns.

Comparative Analysis

Property	Grade 1	Grade 2	Grade 3	Grade 4
Oxygen (wt%)	≤0.18	≤0.25	≤0.35	≤0.40
Iron (wt%)	≤0.20	≤0.30	≤0.30	≤0.50
Tensile Strength	240–370 MPa	≥540 MPa	≥620 MPa	≥740 MPa
Elongation	24–30%	≥21%	≥18%	≥15%
Key Applications	Biomedical	Aerospace/AM	Marine/AM	High-stress

Critical Performance Highlights

Corrosion Resistance

● All grades form a stable TiO₂ passive layer, resisting crevice corrosion in chloride-rich environments (e.g., Ringer’s artificial body fluid).

● Grade 2 shows superior performance in aerospace due to controlled oxygen content.

Additive Manufacturing Suitability

● Grades 2 and 3 are optimized for AM with spherical morphology (15–53 μm), low satellite content, and high flowability.

● Recyclability: Powders can be reused up to 10 cycles without significant degradation.

Biocompatibility

● Grades 1 and 2 are preferred for implants due to low modulus and minimal ion release.

● Grade 4’s high strength is offset by stress shielding risks in bone implants.

Standards and Certifications

ASTM B348: Specifies chemical requirements for CP-Ti grades.

ASTM F67: Governs unalloyed titanium for surgical implants.

ISO 5832-2: Medical implant material standards.