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Hydrothermal Preparation and Sintering of Fine Ceramic Powders

  • Shigeyuki Sōmiya

Abstract

Hydrothermal preparation is one of the methods to.make fine ceramic powders. There are: (1) hydrothermal oxidation, (2) hydrothermal precipitation, (3) hydrothermal synthesis, (4) hydrothermal decomposition, (5) hydrothermal crystallization, etc. Starting materials for hydrothermal oxidation is mainly metal. Reaction between metal and high temperature-high pressure solution occurs to form oxide. Therefore, starting materials for very fine powders are: (1) metal powders or chips, (2) gel, solutions, etc., (3) — oxides and solutions, (4) solids, and (5) hydrous material. This paper describes hydrothermal crystallization and oxidation. Fine powders of ZrO2, Al2O3, HfO2, and Al2O3ZrO2 are described.

Sintered bodies are also able to get under hydrothermal conditions with reactions. Hydrothermal reaction sintered bodies of iron oxides, Cr 2 O 3, ZrO 2 and HfO 2 were obtained under 100 MPa above 1000°C with 1–5 µm grains.

Keywords

Pressure Vessel Hydrothermal Reaction Sintered Body Redistilled Water Hydrothermal Crystallization 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Elsevier Science Publishers LTD 1989

Authors and Affiliations

  • Shigeyuki Sōmiya
    • 1
  1. 1.Laboratory for Hydrothermal Syntheses, Research Laboratory of Engineering MaterialsTokyo Institute of TechnologyMidori, YokohamaJapan

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