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Powder Metallurgy, Ceramics, and Glasses Manufacturing Processes by Associate Professor Su-Jin Kim

Explore the fundamentals of powder metallurgy, ceramics, and glass manufacturing processes taught by Associate Professor Su-Jin Kim from the School of Mechanical Engineering at Gyeongsang National University. Learn about powder production, blending, compaction, sintering, ceramic shaping and firing, glass production methods, and the usage of powder metallurgy in various applications. Gain insights into the powder properties, blending techniques, compaction methods, sintering processes, and design considerations for efficient manufacturing. Discover the economics of powder metallurgy and key factors influencing production costs.

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Powder Metallurgy, Ceramics, and Glasses Manufacturing Processes by Associate Professor Su-Jin Kim

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  1. Manufacturing Processes Powders metallurgy(분말금속) Ceramics(세라믹) Glasses(유리) Associate Professor Su-Jin Kim School of Mechanical Engineering Gyeongsang National University

  2. Contents Powder Metallurgy(분말야금) • Powder production • Blending or mixing • Compaction • Sintering Ceramic • Mixing particles with additives • Shaping • Drying & Firing Glass • Plate, Tubing • Blowing, Pressing

  3. Powder Metallurgy Usage PM1: http://www.youtube.com/watch?v=n_FW7Q2xO5o http://www.hmptech.com

  4. Powder Metallurgy • Powder production • Blending or mixing(혼합) • Compaction(압축) • Sintering(소결) • Finishing operations(마무리가공) PM2: http://www.youtube.com/watch?v=iQIsk44JUYs&feature=related http://www.youtube.com/watch?v=1Mjsi2F2MrY

  5. Powder Production Atomization (입자화) • Liquid-metal stream is broken into powder by water jet. Reduction (환원) • Metallic oxides are reduced to the metallic state.

  6. Particle size and shape • Particle sizeis measured and controlled by screening. • Particle shape is expressed by aspect ratio or shape factor. • Size and shape of particles affect the processing characteristics of the powder.

  7. Blending metal powders (혼합) • Blending (mixing) powders is the second step, and the purposes are: • to impart physical and mechanical properties and characteristics to the P/M part • obtain uniformity from part to part • lubricants aremixed to improve flow characteristics • binders are used for sufficient green strength

  8. Compaction(압축)of metal powders • Powders are pressed into shapes using dies and presses. • Obtain the required shape, density and particle-to-particle contact.

  9. Compaction of metal powders • The density after compaction depends on: • compaction pressure • powder composition • hardness of the powder • Higher the density, higher the strength and elastic modulus of the part.

  10. Sintering • Sintering (소결) is where compacted metal powder is heated to below its melting point for the bonding of the individual metal particles. • Sintered density increases with temperature and time.

  11. Metal Injection Molding (MIM) • Mixing: metal + polymer • Injection monding • Debinding • Sintering • Ceramic Injection Molding (CIM) • Mixing: ceramic + polymer … MIM: http://www.youtube.com/watch?v=BxJaq-WpIIc&feature=related

  12. Design for Powder Metallurgy • Simple & uniform shape • Easy ejection from die • Large tolerance reduce cost • Avoid sharp radius

  13. Economics of Powder Metallurgy • The cost depends on method of powder production, its quality and quantity purchased. • Due to high cost of punches, dies and equipment for P/M processing, production volume must be high.

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