Polvere di Al 7075

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Panoramica della polvere di Al 7075 L'Al 7075 è una delle leghe di alluminio della serie 7000 a più alta resistenza e offre una forza superiore a molti acciai. Lo zinco è il principale elemento di lega, mentre il magnesio conferisce resistenza attraverso l'indurimento per precipitazione. Le proprietà principali della polvere di Al 7075 includono: Resistenza alla trazione e allo snervamento eccezionalmente elevata Elevata durezza e buona resistenza alla fatica...

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Overview of Al 7075 Powder

Al 7075 is one of the highest strength 7000 series aluminum alloys, offering strength superior to many steels. Zinc is the main alloying addition while magnesium imparts strength through precipitation hardening.

Key properties of Al 7075 powder include:

  • Exceptionally high tensile and yield strength
  • High hardness and good fatigue strength
  • Good toughness and moderate ductility
  • Excellent finishing characteristics
  • Elevata resistenza alla corrosione
  • Disponibile in una gamma di dimensioni e forme di polvere

Al 7075 powder is ideal for high-performance aerospace and defense components needing the optimal combination of strength, hardness, fatigue resistance, and moderate weldability.

Chemical Composition of Al 7075 Powder

The typical chemical composition of Al 7075 powder is:

Elemento % Peso
Alluminio (Al) 87.1-91.4%
Zinco (Zn) 5.1-6.1%
Magnesio (Mg) 2.1-2.9%
Rame (Cu) 1.2-2.0%
Ferro (Fe) 0-0.5%
Silicio (Si) 0-0.4%
Manganese (Mn) 0-0.3%
Cromo (Cr) 0.18-0.28%
Titanio (Ti) 0-0.2%

Polvere di Al 7075

Zinc is the primary alloying element while magnesium and copper enhance strength through precipitation hardening. Trace elements like iron, manganese, chromium have minor effects.

Properties of Al 7075 Powder

Key properties of Al 7075 powder include:

Proprietà Valore
Densità 2.81 g/cm3
Punto di fusione 477ÿ635¡«C
Conduttività termica 130ÿ210 W/mK
Conduttività Elettrica 22-30% IACS
Modulo di Young 71ÿ72 GPa
Rapporto di Poisson 0.33
Resistenza alla trazione 570ÿ635 MPa
Limite di snervamento 505ÿ570 MPa
Allungamento 7ÿ10%
Durezza 150ÿ190 Brinell

 

The zinc additions result in extremely high strength and hardness while maintaining reasonable ductility and toughness. The alloy has excellent finishing characteristics.

Production Method for Al 7075 Powder

Commercial production methods for Al 7075 powder include:

  • Atomizzazione a gas?- Molten alloy stream disintegrated by inert gas jets into fine spherical powder particles with controlled size distribution.
  • Atomizzazione dell'acqua?- High pressure water jet used to produce fine Al 7075 powders with irregular shape. Lower cost but higher oxygen pickup.
  • Legame meccanico?- Ball milling a blend of aluminum and alloying element powders followed by cold compaction and sintering.

Gas atomization offers superior control over powder characteristics like particle size, shape and microstructure.

Applications of Al 7075 Powder

Common applications of Al 7075 powder include:

  • manifattura additiva?- Used in selective laser melting, direct metal laser sintering to produce complex, lightweight aerospace and defense parts.
  • Stampaggio a iniezione di metallo?- To manufacture small intricate components with high strength and moderate corrosion resistance.
  • Metallurgia delle polveri?- Press and sinter process to create high-performance automotive parts and machinery components.
  • Termo-spruzzatura?- Wire arc spraying to deposit very hard and wear resistant Al 7075 coatings.
  • Pyrotecnica?- Added as fuel constituent in pyrotechnic compositions due to its high reactivity.
  • Materiale di apporto per la saldatura?- Used as filler wire providing weld strength but limited weldability.

Specifications of Al 7075 Powder

Al 7075 powder is available in various size ranges, shapes, grades and purity levels:

  • Dimensione particellare:Da 10-45 micron per processi AM, fino a 120 micron per processi di spruzzatura termica.
  • Morfologia:?Spherical, irregular and mixed particle shapes. Smooth spherical powder has better flowability.
  • Purezza:?From commercial to high purity grades tailored for the specific application.
  • Gradi:?Conforming to ASTM B951, AMS 4045, AMS 4282, EN 573-3 and other equivalent standards.
  • Contenuto di ossigeno:?Varies between 500-1500 ppm based on production method. Lower is better.

Global Suppliers of Al 7075 Powder

Alcuni dei maggiori fornitori a livello globale sono:

  • Sandvik Osprey (Regno Unito)
  • TLS Technik (Germania)
  • Valimet Inc. (USA)
  • CNPC Powder (Cina)
  • Makin Metal Powders (UK)
  • PyroGenesis Canada
  • Metal Powder Company (USA)

These companies produce Al 7075 powder suitable for various applications using different manufacturing processes.

Al 7075 Powder Pricing

Pricing of Al 7075 powder depends on factors like:

  • Livelli di purezza
  • Caratteristiche delle particelle
  • Metodo di produzione della polvere
  • Quantità ordine
  • Fornitore e ubicazione geografica
Grado Fascia di prezzo
Commerciale $10-20 per kg
Elevata purezza $20-40 per kg
Ultrafine $40-80 per kg
Grado speciale $80-150 per kg

 

Gas atomized, controlled particle size, high purity powders command much higher pricing than simple commercial grade Al 7075 powder.

Storage and Handling of Al 7075 Powder

Al 7075 reactive alloy powder must be handled with care to prevent:

  • Ossidazione e reazione con l'umidità
  • Pericoli di esplosione di polvere da polvere fine
  • Problemi di salute correlati all'inalazione
  • Le pratiche di sicurezza suggerite dal fornitore devono essere seguite

Inert gas blanketing, proper grounding, ventilation, and PPE should be utilized for safe handling.

Metodi di Test e Caratterizzazione

Key test methods used for Al 7075 powder include:

  • Analisi della composizione chimica mediante OES o XRF
  • Distribuzione delle dimensioni delle particelle secondo lo standard ASTM B822
  • Analisi morfologica tramite SEM
  • Powder flow rate using Hall flowmeter
  • Misura della densità mediante picnometro ad elio
  • Test di impurità mediante ICP-MS
  • Esame microstrutturale tramite diffrattometria a raggi X

These tests ensure the powder meets the required chemical, physical, and microstructural characteristics for the specific application.

Comparison Between Al 7075 and Al 6061 Powder

Al 7075 and Al 6061 are two aluminum alloy powders compared:

Parametro Al 7075 Al 6061
Tipo lega Trattato a caldo Trattato a caldo
Contenuto di Zn 5.1-6.1% 0%
Contenuto di Mg 2.1-2.9% 0.8-1.2%
Forza Much higher Moderato
Lavorabilità Scarso Eccellente
Saldabilità Scarso Davvero ottimo
Resistenza alla corrosione Moderato Eccellente
Costi Più alto Inferiore

 

Al 7075 offers very high strength whereas Al 6061 provides better corrosion resistance, weldability and machinability at lower cost.

Al 7075 Powder FAQs

Q: How is Al 7075 powder produced?

A: Al 7075 powder is commercially produced using gas atomization, water atomization, mechanical alloying and electrolysis techniques. Gas atomization offers the best control of particle characteristics.

Q: What are the main applications for Al 7075 powder?

A: The major applications for Al 7075 are additive manufacturing, thermal spray coatings, powder metallurgy parts manufacturing, metal injection molding, and pyrotechnic compositions requiring exceptionally high strength.

Q: What is the recommended particle size for Al 7075 powder in AM?

A: For most metal 3D printing processes, the ideal particle size range for Al 7075 is 15-45 microns with spherical morphology and good powder flowability.

Q: Does Al 7075 powder require any special handling precautions?

A: Yes, it is recommended to handle reactive aluminum alloy powders carefully under inert atmosphere using proper grounding, ventilation and PPE.

Q: Where can I purchase ultrafine Al 7075 powder suitable for aerospace components?

A: High purity, gas atomized ultrafine Al 7075 powders meeting aerospace requirements can be sourced from leading suppliers such as Sandvik Osprey, TLS Technik, and Valimet Inc.

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