Ultra-Rapid Sintering of Ceramics

  • D. Lynn Johnson


While most ceramics are sintered slowly in batch or pass-through procedures with processing times measured in hours, simple shapes can be fired in minutes or even seconds. Early work by Morgan et al.1–3 and Vergnon et al.4–5 involved rapid heating of small low density, high surface area powder compacts, using a low thermal mass furnace or rapid insertion into a preheated furnace, respectively. Maximum heating rates of 30 K/S and 100 K/s were reported. High densities were not attained in either work. Wynn-Jones and Miles6 sintered β-alumina tubes by passing them through an induction heated alumina muffle tube at 12.5 mm/min with a maximum heating rate of about 3 K/s, resulting in good densification. Harmer et al.7 used a similar scheme to sinter MgO-doped α-alumina at heating rates up to 40 K/s, obtaining high densities and grain sizes that were significantly smaller than those attainable by conventional sintering schedules. They attributed the high densification rates and fine fired grain size to the suppression of surface diffusion, which dominates sintering at the lowest temperatures.


Surface Diffusion Boundary Diffusion Sintered Density Shrinkage Rate Linear Shrinkage 
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Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • D. Lynn Johnson
    • 1
  1. 1.Department of Materials Science and EngineeringNorthwestern UniversityEvanstonUSA

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