Microwave sintering of nanophase ceramics without concomitant grain growth

Patent · Fri Jan 01 00:00:00 EST 1993

OSTI ID:868828

Eastman, Jeffrey A ^[1]; Sickafus, Kurt E ^[2]; Katz, Joel D ^[3]

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1. Woodbridge, IL
2. Santa Cruz, NM
3. Los Alamos, NM

A method of sintering nanocrystalline material is disclosed wherein the nanocrystalline material is microwaved to heat the material to a temperature less than about 70% of the melting point of the nanocrystalline material expressed in degrees K. This method produces sintered nanocrystalline material having a density greater than about 95% of theoretical and an average grain size not more than about 3 times the average grain size of the nanocrystalline material before sintering. Rutile TiO.sub.2 as well as various other ceramics have been prepared. Grain growth of as little as 1.67 times has resulted with densities of about 90% of theoretical.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 5223186
• OSTI ID: 868828
• Country of Publication: United States
• Language: English

Related Subjects

microwave
sintering
nanophase
ceramics
concomitant
grain
growth
method
nanocrystalline
material
disclosed
microwaved
heat
temperature
70
melting
expressed
degrees
produces
sintered
density
95
theoretical
average
size
times
rutile
various
prepared
67
resulted
densities
90
nanocrystalline material
average grain
crystalline material
microwave sintering
grain size
grain growth
method produces
nanophase ceramics
phase ceramic
nanophase ceramic
method produce
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