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POWDER METALLURGY Prof . J Viplava Kumar MME,MGIT

POWDER METALLURGY Prof . J Viplava Kumar MME,MGIT. Outline Introduction Production of Powders Consolidation Applications. Advantages Economical mass production technology Scrapfree technology Unique technique: Porous Components, Cermets,

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POWDER METALLURGY Prof . J Viplava Kumar MME,MGIT

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  1. POWDER METALLURGY Prof. J Viplava Kumar MME,MGIT

  2. Outline • Introduction • Production of Powders • Consolidation • Applications

  3. Advantages • Economical mass production technology • Scrapfreetechnology • Unique technique: Porous Components, Cermets, • Refractory Metals, Cemented carbides Limitations • Limitations on shape and size of products • Health hazards • Fine powders of reactive metals - pyrophoric

  4. Applications

  5. Tungsten filaments:

  6. Production of Powders Atomization Example: Powders of Superalloys, HSS, Cu-Al

  7. ii) Reduction of oxides Fe powder at Hoganas iii) Chemical reduction: Carbonyl Ni and Fe iv) Chemical + Mechanical methods: Stainless steel, Ti, Zr (NFC-ECIL)

  8. Consolidation Techniques • Compaction • Sintering Compaction: Shaping, deformation and densification of a powder by application of Pressure

  9. Die Compaction: Schematic of the die compaction process

  10. Isostatic Compaction Applying stress uniformly in all directions

  11. Schematics of Isostatic Pressing

  12. Cold Isostatic Compaction:

  13. Hot Isostatic Pressing:

  14. Sintering: Thermal process which increases the strength of a powder mass by bonding adjacent particles via diffusion Steps of Sintering

  15. Liquid phase sintering: WC- Co system

  16. Thank You

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