Liquid Phase Sintering Distortion and Observations
on Gravity Effects on
Materials Processing
Speaker:
Randall M.
German
Brush Chair Professor in Materials
Director, Center for Innovative Sintered Products
The
Date/Time:
(Refreshments will be served after the end of the
Seminar).
Venue: LT 15, NTU
(Level 4, North Spine, near CSE)
Abstract
A classic problem in liquid phase sintering is the
attainment of full density without distortion. There are
many well-known systems, including WC-Co, Cu-Sn,
Fe-Cu-C and W-Ni-Fe, where full density is possible without significant loss of
precision due to slumping or distortion; however, all of these systems are
characteristically high in solid content.
This presentation will introduce new experimental
results for sintering densification in the two phase solid-liquid region. Critical experiments have
been performed to isolate gravity effects on pore buoyancy and grain settling,
showing that gravity is very important to densification. Surprisingly, we find
distortion is larger in microgravity sintering and densification is less. This means that envisioned
microgravity manufacturing will be much harder than originally anticipated. Altogether the
About the
Speaker
Brief Introduction to Prof. R.M. German:
Education
B.S.
(Material Science),
M.S.
(Metallurgy),
Ph.D.
(Material Science),
Research
and Teaching
Dr. German's research and teaching efforts
focus on particulate materials processing.
Example
research areas include:
Powder fabrication
Mixing and blending
Characterization
Compaction
Sintering, especially Liquid Phase Sintering
Microstructure control
Example
applications include:
High performance magnets
Tungsten-based composites
Aluminum reduction cells
High temperature jet engines
Catalytic converters
Solder pastes
Diamond-intermetallic cutting tools
High surface area capacitors
Rapid prototyping systems
Chemically inert filters
Biomedical microdevices
X-ray telescope collimators
Ferrous automotive components
High thermal conductivity micoelectronic
packages
Cemented carbides wear components
Publications
Books
Authored
Sintering Theory and Practice
Powder
Metallurgy Science, 2nd edition
Liquid Phase Sintering
Powder Injection Molding
Particle Packing Characteristics
Other
Publications
Published over 400 articles
Edited 11 books
Co-editor of the book series Reviews in Particulate Materials
Inventor with over 10 patents
Awards
Fellow of ASM International
MPIF Distinguished Service to Powder Metallurgy Award
Engineering Award of Distinction from
Distinguished Engineering Alumni Award from
Japan Institute of Metals Technical Development Award
Kuczynski Award and Samsonov
Prize of ITSS
Admission is free and all are welcome. For enquiries, please contact Ms