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الطباعة ثلاثية الأبعاد لمسحوق التيتانيوم is a strong, lightweight, and corrosion-resistant metal that is ideal for 3D printing complex and durable parts for aerospace, automotive, medical, and other advanced applications. This article provides a comprehensive overview of titanium powder metallurgy, properties, applications, and suppliers for additive manufacturing with titanium.

Overview of 3d printing titanium powder

Titanium is a desirable material for 3D printing due to its high strength-to-weight ratio, fatigue and fracture resistance, and biocompatibility. Titanium powders allow parts to be printed by powder bed fusion processes with fine features and complex geometries.

Titanium grades: Commonly used titanium alloys for AM include Ti-6Al-4V (Ti64), Ti64 ELI, commercially pure (CP) Ti grade 2, and Ti 6242.

Powder production: Titanium powder is produced by gas atomization where molten titanium is atomized by an inert gas jet into fine spherical particles with tight size distribution. Plasma rotating electrode process (PREP) is also used.

Powder sizes: Typical powder sizes range from 15-45 microns. Finer powders around 15 microns allow better resolution while coarser 45 micron powder allows higher build rates.

Flowability and reuse: Spherical morphology and controlled size distribution impart good flowability. Titanium powder can usually be reused up to 10-20 times if handled properly.

Safety: Titanium powder is highly flammable and reactive with air due to its pyrophoric nature. Proper handling in an inert atmosphere is critical.

Composition and Microstructure

Titanium powder composition, microstructure, phases present, and defects like porosity determine the final properties of printed parts.

Elemental composition

سبيكةالتيتانيومألومنيومVanadiumIronOxygenNitrogenHydrogen
Ti-6Al-4Vالرصيد5.5-6.5%3.5-4.5%<0.3%<0.2%<0.05%<0.015%
Ti-6Al-2Sn-4Zr-6Moالرصيد5.5-6.5%
CP Grade 2 Ti99.2% min0.3% max0.25% max0.03% max0.015% max

Phases: Titanium alloys contain mixture of α hexagonal close packed and β body centered cubic phases. Cooling rates in AM can generate non-equilibrium phases.

Defects: Lack of fusion, porosity, microcracks can occur and degrade mechanical properties. Hot isostatic pressing (HIP) helps reduce defects and improve consistency.

Grain structure: Columnar prior-β grains along build direction are seen in AM titanium alloys due to rapid solidification and epitaxial growth. The widths of columnar grains influence strength.

Surface roughness: Powder bed fusion processes lead to semi-smooth as-printed surfaces due to partially melted powder particles. Additional finishing is often required.

الخصائص الرئيسية

The properties of printed titanium parts are influenced by composition, porosity, surface roughness, build orientation, heat treatment, and testing direction.

Physical properties

الممتلكاتTi-6Al-4VCP Grade 2 Ti
Density (g/cc)4.424.51
Melting point (°C)1604-16601668

Mechanical properties

الممتلكاتAs-printedHot isostatic pressed (HIP)Wrought mill-annealed
Tensile strength (MPa)900-1300950-1150860-965
Yield strength (MPa)800-1100825-900790-870
Elongation at break (%)5-158-2015-25
Hardness (HRC)32-4432-3631-34

مزايا

  • نسبة عالية من القوة إلى الوزن
  • Retains strength at elevated temperatures
  • Resistant to fatigue, wear, and corrosion
  • Bioinert – suitable for medical implants
  • Can withstand sterilization treatments

محددات

  • Expensive material and AM processing
  • Reactive and flammable powder
  • Anisotropic properties
  • Lower ductility than wrought forms
الطباعة ثلاثية الأبعاد لمسحوق التيتانيوم
3D Printing Titanium Powder 3

Applications of Additively Manufactured Titanium Parts

3D printing expands uses for titanium into lighter, stronger, and higher-performing components across industries.

الفضاء الجوي: Turbine blades, airframe and engine structures, antennas, heat exchangers

السيارات: Connecting rods, valves, turbocharger wheels, drivetrain components

Medical and dental: Orthopedic implants, prosthetics, surgical instruments, patient-matched devices

Oil and gas: Corrosion-resistant pipes, valves, wellhead components, separators

Consumer goods: Sporting equipment like bicycle frames, golf club heads, eyeglass frames

Tooling: Lightweight conformal cooling channels integrated into metal injection molds, jigs, fixtures

Popular الطباعة ثلاثية الأبعاد لمسحوق التيتانيوم for AM

سبيكةالتطبيقاتPrintabilitySurface Finishالخواص الميكانيكية
Ti-6Al-4V ELIAerospace components, biomedical implantsممتازمعتدلHigh strength, hardness, fatigue life
Ti-6Al-4VStructural aerospace parts, automotiveVery goodمعتدلStrength, fracture toughness
Ti 6242High-temperature componentsجيدفقيرStrength at 300°C, creep resistance
CP Grade 2 TitaniumMedical implants, chemical plantsمعتدلVery goodDuctility, corrosion resistance

Specifications and Standards

Stringent quality requirements are enforced for titanium powder and printed parts per aerospace and medical standards.

Powder specifications

المعلمةRequirementTest Method
حجم الجسيمات15-45 μmLaser diffraction
الكثافة الظاهرة≥ 2.7 g/ccHall flowmeter
كثافة الحنفية≥ 3.2 g/ccTap density tester
معدل التدفق15-25 s/50gHall flowmeter
Chemical compositionCertificate of analysisGDMS, ICP-MS

Part qualification standards

Standardالتفاصيل
ASTM F3001Standard for AM titanium parts
ASTM F2924Titanium alloy Ti-6Al-4V ELI
ASTM F3184Feedstock titanium alloy powder
AMS7009Aerospace material specification
ISO 13485Medical devices – Quality management

Design Principles for Titanium AM

Proper component design is crucial to harness benefits of additive manufacturing with titanium.

  • Minimize overhangs to avoid support structures
  • Orient parts to enable easier powder removal
  • Allow for post-processing like HIP and machining
  • Include built-in channels for conformal cooling
  • Consolidate assemblies into single titanium parts
  • Reinforce high stress regions with lattices
  • Optimize shapes for weight reduction via topology optimization

Suppliers of الطباعة ثلاثية الأبعاد لمسحوق التيتانيوم

الموردGrades OfferedPowder SizesAdditional Services
AP&CTi-6Al-4V, Ti-6Al-4V ELI, Ti64, CP-Ti grades 1-415-45 μmAnalysis, testing, sieving, blending, storage
مضافات النجارTi-6Al-4V, Ti-6Al-2Sn-4Zr-6Mo15-45 μmCustom alloys, parameter development
تقنية LPWTi-6Al-4V ELI, Ti-6Al-4V, CP-Ti grade 215-45 μmMaterial testing, powder reuse analysis
براكسيرTi-6Al-4V, Ti-6Al-4V ELI15-100 μmSieving, blending, storage
ساندفيكOsprey titanium alloys15-45 μmPowder lifecycle management

التكلفة: ~$500-$1000 per kg but depends on order volume, grade, size distribution, gas atomization method, additional handling, and testing requirements.

الطباعة ثلاثية الأبعاد لمسحوق التيتانيوم
3D Printing Titanium Powder 4

أسئلة وأجوبة

Q: What methods can be used to 3D print titanium parts?

A: Titanium is primarily printed by powder bed fusion using selective laser melting (SLM) and electron beam melting (EBM). Wire-based methods like laser metal deposition (LMD) and weld-based directed energy deposition (DED) are also possible but less common.

Q: Does titanium powder for AM require special storage or handling?

A: Yes, titanium reacts readily with air so the powder must be stored and processed under inert atmosphere using argon or nitrogen gas. Flammable environments and ignition sources must be avoided. Operators should wear protective equipment when handling titanium powder.

Q: What causes porosity issues in titanium AM parts?

A: High cooling rates lead to gas entrapment causing lack of fusion defects. Optimization of parameters like power, speed, hatch spacing, focus offset and powder layer density are required to minimize porosity. Hot isostatic pressing (HIP) can also help densify parts after initial printing.

Q: Why is it hard to achieve smooth titanium surfaces directly after AM processing?

A: Partially melted titanium powder can adhere to surfaces causing a rough finish. Tumbling, sandblasting, milling, grinding and polishing are secondary operations used to smooth titanium printed parts. Chemically or electrochemically finishing processes are also used.

Q: Can you 3D print commercially pure titanium?

A: Yes, grades 1 through 4 unalloyed CP titanium powder meeting ASTM standards like B348 for composition and particle size distribution can be used to print pure titanium components for applications needing high ductility like bone implants and chemical plants.

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