JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objective

This course is designed to impart various principles of metal powder

processing applied to fabrication of structural and commercial products. It is also intended to elucidate the process variables in powder metallurgy technology and develop concepts of intellectual thinking for future applications.

Course Outcome

The student will be able to understand the significance, process, and

applications of this unconventional fabrication technology in detail.

UNIT - I

Introduction: Emergence and importance of powder metallurgy. Comparison of powder metallurgy with other manufacturing techniques. Its scope and limitations. Characterization of Powders: Determining powder characteristics: particle shape, size, size distribution, specific surface area, apparent and tap density, angle of repose, compressibility/compactibility.

UNIT - II

Methods of Powder Production: chemical reduction (tungsten, iron), carbonyl decomposition (iron, nickel), atomization (pure metal and multi-component alloy powders), milling (oxides), electrolysis (elemental powders). Influence of the manufacturing process on powder characteristics.

UNIT - III

Consolidation of Metal Powders: Compaction: Isostatic pressing and die compaction. Theory of consolidation: Pressure transmission in powders. Pressure dependence of densification. Green strength. Sintering: Mechanisms of solid state and liquid phase sintering. Effect of powder characteristics on compaction and sintering. Hot Pressing, Hot isostatic pressing. Sinter forging. Properties of P/M parts.

UNIT - IV

P/M Products: I. Porous Parts: Filters, Self-lubricating bearings (CuSn). II. Dispersion strengthened materials: (Al2O3, Ni-ThO2). III. Electrical materials - Tungsten lamp filaments, Thoriated tungsten welding electrodes, tungsten automobile electrical contacts.

R16 B.TECH METALLURGICAL AND MATERIALS ENGG.

UNIT - V

P/M Products: IV. Magnetic materials: Fe-Ni soft magnets, ALNICO and SmCo5 permanent magnets. V. Cutting Tools: Cemented carbides (WC-Co). VI. Special Products: Heavy alloys (W-Ni-Fe).

TEXT BOOK:

• 1. Powder Metallurgy Science - Randall M German, Metal Powder Industries Federation, 1994 - Technology & Engineering,USA,1994
• 2. Powder Metallurgy Science, Technology and Materials, Anish Upadhaya, GS Upadhaya, University Press, IIM, 2011

REFERENCES:

• 1. Powder Metallurgy Principles – Fritz V. Lenel , Princeton, 1986
• 2. Powder Metallurgy, PC Angelo R16 B.TECH METALLURGICAL AND MATERIALS ENGG.