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

2. Manufacturing Techniques
Conventional route
Foundry/ Casting
Powder Metallurgy

3. Outline
Introduction
Production of Powders
Consolidation
Applications

4. Limitations on shape and size of products
Advantages
Economical mass production technology
Scrapfree technology
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

5. Applications

6. Tungsten filaments:

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

8. 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)

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

10. Die Compaction: Schematic of the die compaction process Compaction
Isostatic compaction
Die Compaction:
Schematic of the die compaction process

11. Isostatic Compaction Applying stress uniformly in all directions
Cold Isostatic Compaction
Hot Isostatic Compaction

12. Schematics of Isostatic Pressing

13. Cold Isostatic Compaction:

14. Hot Isostatic Pressing:

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

16. Liquid phase sintering:
WC- Co system

18. Thank You