Properties of Molybdenum Metal Powder

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Molybdenum metal powder is an important material with growing applications in various industries. This guide provides a detailed overview of molybdenum metal powder, its properties, production methods, applications, suppliers, and more.

Overview of Molybdenum Metal Powder

Molybdenum is a silvery-white transition metal with the symbol Mo and atomic number 42. In its pure metal form, molybdenum has high strength, hardness, thermal conductivity, and resistance to corrosion.

Molybdenum metal powder refers to small particles of pure molybdenum metal or molybdenum alloys produced through various methods into a fine powder form.

Here is a quick reference table summarizing key details about molybdenum metal powder:

المعلمةالتفاصيل
الصيغة الكيميائيةمو
Atomic Number42
Atomic Weight95.95 g/mol
الكثافة10.22 g/cm3
نقطة الانصهار2622°C
اللونSilver-white
Common Powder TypesPure molybdenum, molybdenum alloys
أحجام الجسيمات1-100 microns
الخصائص الرئيسيةHigh strength, thermal conductivity, corrosion resistance, lubricity
Main ApplicationsMetallurgy, chemicals, catalysts, coatings, electronics

Molybdenum metal powder offers several beneficial properties that make it suitable for use across various high-temperature applications in different industries.

مسحوق معدن الموليبدينوم
Properties of Molybdenum Metal Powder 4

Properties of Molybdenum Metal Powder

Molybdenum metal powder possesses a unique combination of chemical, physical, electrical, and mechanical properties. Here are some of the key properties of molybdenum powder:

درجة انصهار عالية

Molybdenum has an extremely high melting point of 2622°C, which is higher than most commercial metals. This allows molybdenum powder to retain its strength and resist deformation under high temperature service conditions above 1000°C.

التوصيل الحراري

Molybdenum has a thermal conductivity of 138 W/m-K, which enables efficient heat transfer in applications like electrodes and heating elements. This improves thermal shock resistance.

مقاومة التآكل

Molybdenum powder exhibits excellent corrosion resistance towards acids, salts and reducing atmospheres even at elevated temperatures. A protective oxide layer forms on the surface.

High Strength

Molybdenum has high tensile strength ranging from 200 to 300 MPa. This gives components good creep resistance and structural integrity.

Lubricity

Molybdenum powder provides solid lubrication in certain applications, reducing friction and wear. The lubricity increases at higher temperatures.

التوصيل الكهربائي

Molybdenum has electrical resistivity of 5.5 microohm-cm, making it useful as electrodes, contacts and heating elements.

This unique combination of properties makes molybdenum metal powder suitable for specialized high-temperature applications in demanding environments. Proper powder characteristics help utilize these properties.

Production Methods for Molybdenum Metal Powder

Molybdenum metal powder can be produced through various techniques that reduce the particle size of molybdenum metal to achieve a fine powder form:

Mechanical Milling

Molybdenum lumps are crushed into a powder using ball mills or stamp mills. Controlled milling produces fine powder down to 1 micron.

الانحلال الغازي

Molten molybdenum is atomized by an inert gas jet into small droplets that solidify into fine spherical powder. Powders up to 100 microns can be produced.

Plasma Spheroidization

Irregular molybdenum powder is remelted and spheroidized using a plasma torch to make spherical powder with good flowability.

Chemical Reduction

A molybdenum compound like molybdenum oxide is chemically reduced using hydrogen gas to obtain pure metallic powder.

التحليل الكهربائي

Aqueous molybdate salt solution is electrolyzed to deposit molybdenum powder onto the cathode.

Proper control over the production process parameters yields molybdenum powder with customizable particle size, shape, purity, and microstructure suitable for the intended application.

أنواع Molybdenum Metal Powder

Molybdenum metal powders are available in different types depending on composition and application requirements:

Powder Typeالوصف
الموليبدينوم النقيContains 99% or more molybdenum with minimal impurities
Molybdenum AlloysAlloyed with other metals like lanthanum, titanium, tungsten, niobium, etc.
Oxide CoatedThin oxide layer provides corrosion resistance
Lubricant CoatedCoated with lubricants like graphite, molybdenum disulfide, tungsten disulfide etc.
Sintering Aids CoatedWith nickel coating to promote sintering of powder compacts

Pure molybdenum powder provides optimal high temperature performance. Alloying additions like potassium, silicon and boron improve machinability and sinterability. Coatings tailor the powder properties for specific applications.

توزيع حجم الجسيمات

Molybdenum powder is available in different particle size distributions categorized as per the mesh sizes:

Powder GradeParticle Size (microns)
Ultrafine1-10
Submicron1-20
Fine10-30
متوسط30-75
Coarse75-150

Ultrafine and submicron powders provide higher sintered density and uniform microstructure. But they can be pyrophoric. Coarse powders offer better flowability for industrial handling. A suitable particle size is chosen based on final part requirements.

مسحوق معدن الموليبدينوم
Properties of Molybdenum Metal Powder 5

Characteristics of Molybdenum Powder

Molybdenum powders are characterized by various attributes that determine their performance:

المعلمةSignificance
حجم الجسيماتAffects sintered density, shrinkage, microstructure, surface area
شكل الجسيماتSpherical shape provides good flowability
النقاءHigh purity optimizes high temperature behavior
الكثافة الظاهرةInfluences compliance with net-shape processing
Specific Surface AreaDetermines sintering kinetics and densification
Sintering ActivityAbility to densify into a pore-free microstructure
Oxygen ContentLower oxygen improves ductility and conductivity

The powder characteristics are tailored to meet the needs of specific applications during powder production itself.

Applications of Molybdenum Metal Powder

Molybdenum metal powder finds uses in diverse high temperature applications across different industries:

Automotive Parts

  • Pistons
  • Engine valves
  • Nozzle parts

التلامس الكهربائي

  • Relays
  • Switches

Heating Elements

  • High temperature furnaces
  • Kilns

Welding Products

  • Welding rods
  • Wire fluxes

Chemical Equipment

  • Reactor vessels
  • المبادلات الحرارية

الإلكترونيات

  • Conductive pastes
  • Metallization of ceramics

الطلاءات

  • Thermal spray coatings
  • Corrosion resistant coatings

المركبات

  • Reinforcements
  • Microwave absorbers

Catalysts

  • Hydrotreating catalysts
  • Hydrocracking catalysts

Molybdenum powder imparts high temperature strength, conductivity, corrosion resistance, and other benefits to components across these applications.

Global Suppliers of Molybdenum Powder

Some of the major global suppliers of molybdenum metal powder include:

شركةالموقع
H.C. Starckألمانيا
MolymetChile
JDC-Molyالصين
Exploiter Molybdenumالصين
Shandong Guangchuan Molybdenumالصين
Jiangsu Fengfeng Tungsten & Molybdenumالصين

These companies can provide molybdenum powders customized for various applications in terms of composition, particle size, shape, and powder characteristics.

Pricing of Molybdenum Powder

The price of molybdenum metal powder depends on various factors:

  • النقاء: High purity (99.9%) powder is more expensive than lower purity grades.
  • حجم الجسيمات: Ultrafine and submicron powders are more costly than coarse powders.
  • التركيب: Alloy powders and coated powders cost more than pure molybdenum.
  • الكمية: Prices decrease for bulk orders due to economies of scale.
  • المورد: Prices vary between different global suppliers.

Typical price ranges:

Powder Gradeنطاق السعر
الموليبدينوم النقي$30-50 per kg
مسحوق سبيكة$50-100 per kg
Ultrafine Powder$80-150 per kg

Contact suppliers for exact price quotes based on your specific requirements.

Processing Molybdenum Powder into Parts

Molybdenum powder can be converted into parts using various techniques:

Press and Sinter

Compacting into a green compact using presses, followed by vacuum sintering. This is the most common method.

قولبة حقن المعادن بالحقن (MIM)

Mixing with binder into a feedstock and injection into a mold to produce complex shapes.

التصنيع الإضافي

3D printing of molybdenum parts using laser or electron beam powder bed fusion.

الرش الحراري

Spray coating using molybdenum powder to deposit coatings.

العمليةمزاياسلبيات
Press and SinterSimple, low costLimited complexity, machining required
قولبة حقن المعادن بالحقن (MIM)Complex shapes, net shapeMulti-step process, binder removal
التصنيع الإضافيCustom designs, fast turnaroundHigh equipment costs, size limitations
الرش الحراريLow equipment cost, large partsPorous coatings, line-of-sight process

The optimum powder metallurgy process is selected based on part size, shape, quantity and properties.

Installation, Operation and Maintenance

Proper installation, operation and maintenance practices must be followed when handling molybdenum powder:

  • Use inert gas gloves during powder handling to prevent oxidation. Molybdenum oxidizes readily in air at high temperatures.
  • Store powder sealed and dry to prevent any moisture pick up. Moisture can make the powder pyrophoric.
  • Handle powder in well-ventilated areas away from sparks or ignition sources. Finely divided molybdenum powder may be flammable.
  • Dispose according to local environmental regulations. Molybdenum may present hazards if released into the environment.
  • Develop standard operating procedures for safe handling, processing and maintenance. Provide training to personnel.
  • Inspect equipment regularly for leaks, damaged seals or clogged powder transfer lines. Perform preventive maintenance.
  • Follow recommended practices by occupational health and safety organizations to minimize risks.

Proper handling is vital for optimizing powder quality, equipment lifespan and operational safety.

Choosing a Reliable Molybdenum Powder Supplier

Here are some tips for selecting a suitable molybdenum powder supplier:

Experience

  • Look for an established company with years of experience in producing molybdenum powders specifically.

Technical Capability

  • Ensure the supplier has expertise in manufacturing powders with customized characteristics using various techniques.

Quality Systems

  • Select a supplier certified for quality standards like ISO 9001 that follows strict quality control practices.

R&D Competence

  • Give preference to suppliers investing in R&D to continually improve their powder production processes.

خدمة الزبائن

  • Choose a responsive supplier focused on understanding customer needs and providing personalized service.

Logistics Infrastructure

  • Opt for suppliers with warehousing and transportation capabilities to ensure timely worldwide delivery.

التسعير

  • Compare price quotations from shortlisted suppliers to strike an optimal balance between cost and quality.

Choosing an experienced and reliable molybdenum powder manufacturer helps obtain a consistent supply of high-quality powder tailored for specific requirements.

Pros and Cons of Molybdenum Metal Powder

Molybdenum powder offers several benefits along with some limitations:

الإيجابيات

  • Excellent high temperature strength
  • موصلية حرارية عالية
  • Strong corrosion resistance
  • Good wear resistance
  • High electrical conductivity
  • Low thermal expansion
  • Net-shape manufacturability

السلبيات

  • Relatively high cost
  • Low machinability in sintered form
  • Susceptible to oxidation at high temperatures
  • Limited weldability in some forms
  • Brittle behavior at low temperatures

For applications requiring stable performance at temperatures above 1000°C with thermal cycling, molybdenum powder provides unique capabilities despite its higher cost.

مسحوق معدن الموليبدينوم
Properties of Molybdenum Metal Powder 6

أسئلة وأجوبة

Q: What is molybdenum metal powder used for?

A: The main uses of molybdenum powder are in metallurgy, chemicals, coatings, electronics, welding, automotive parts, heating elements, and other high-temperature applications.

Q: Does molybdenum powder require special handling?

A: Yes, molybdenum powder may be flammable when finely divided. It also readily oxidizes at high temperatures. Proper inert atmosphere handling and storage is required.

Q: Is molybdenum powder toxic?

A: Molybdenum has low toxicity but molybdenum powder may present health hazards like eye or respiratory irritation upon prolonged exposure. Adequate safety precautions are advised.

Q: What methods can shape molybdenum powder into components?

A: The main powder processing methods are press-and-sinter, metal injection molding, additive manufacturing, and thermal spraying. The method is selected based on part size, shape, and requirements.

Q: Does molybdenum powder require sintering aids?

A: For press-and-sinter processing, small amounts of nickel or iron are often added to molybdenum powder to promote sintering. Other sintering aids can also assist densification.

خاتمة

Molybdenum metal powder is a versatile high-performance material suitable for specialized applications involving high temperatures, thermal cycling, and corrosive environments where other materials are inadequate. Continued advances in molybdenum powder production and processing are expanding its utilization across more industries. With proper handling and processing, components produced from molybdenum powder can provide exceptional performance under demanding service conditions.

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