Compressed air nozzle

spraycleaningcooling

In powder metallurgy (PM) processes, boron nitride and zirconia ceramic nozzles are used depending on the type of metal materials. Main Features of Ceramic Nozzles - High-temperature resistance: withstands temperatures above 1500°C from molten metals or plasma flames. - Wear resistance: resists erosion from powder or gas flow for long-term operation. - Chemical inertness: does not react with active metals or gases. Applications at Different Stages of Powder Metallurgy Stage: Powder Preparation - Process: Gas Atomization - Functions of Nozzles: High-pressure inert gas (such as nitrogen or argon) impinges on the molten metal stream to form fine powder; ceramic nozzles control flow and particle size. - Ceramic Nozzles: Boron Nitride and Zirconia - Typical Metals: High-purity or reactive metals such as titanium and nickel-based alloys. - Process: Water Atomization - Functions of Nozzles: Ceramic nozzles provide corrosion resistance and precise flow control. - Ceramic Nozzles: Zirconia - Typical Metals: Used in high-pressure water atomization for preparing low-cost powders such as iron-based powders. Stage: Powder Spraying or Deposition - Process: Thermal Spraying - Functions of Nozzles: During coating or preform preparation (e.g., plasma spraying or HVOF), ceramic nozzles spray metal powders onto substrates to form dense coatings. - Ceramic Nozzles: Boron Nitride and Zirconia - Typical Metals: Applicable to all metal powders. Stage: Powder Transportation and Treatment - Process: Fluidized Bed or Pneumatic Transportation - Functions of Nozzles: Ceramic nozzles are used to control gas flow, evenly disperse or convey powders, and prevent agglomeration or clogging. - Ceramic Nozzles: Boron Nitride and Zirconia - Typical Metals: Tungsten, molybdenum, iron, cobalt, nickel, aluminum, titanium, tantalum, and other active metal powders. Stage: Treatment After Sintering - Process: Cooling or Atmosphere Control - Functions of Nozzles: Ceramic nozzles spray inert gases (e.g., hydrogen, nitrogen) or cooling media to control furnace atmospheres and accelerate part cooling to prevent oxidation. - Ceramic Nozzles: Boron Nitride and Zirconia - Typical Metals: High-performance metal powders such as high-speed steel, titanium alloys, and amorphous/metallic glass powders. Stage: 3D Printing (e.g., Binder Jetting) - Functions of Nozzles: Ceramic nozzles are used to accurately spray binders or metal slurries. - Ceramic Nozzles: Boron Nitride and Zirconia - Typical Metals: Powder metallurgy additive manufacturing applications. Stage: Degreasing or Cleaning - Functions of Nozzles: Ceramic nozzles are used to remove temporary binders or residual powder from compacts. - Ceramic Nozzles: Zirconia - Typical Metals: Titanium and its alloys, nickel-based superalloys, aluminum alloys, cobalt-chromium alloys, refractory metals (tungsten, tantalum, molybdenum), precious metals (gold, silver, platinum), and high-entropy alloys. Technical Specifications / Features: - High-temperature resistance above 1500°C - Wear and corrosion resistance - Chemical inertness - Suitable for various powder metallurgy processes: atomization, spraying, transportation, sintering, 3D printing, cleaning - Boron nitride and zirconia ceramics available in multiple compositions and strengths - Customizable properties for specific applications