CP-Ti

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  

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.