Superplastically foaming method to make closed pores inclusive porous ceramics

Akira Kishimoto, Hidetaka Hayashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Porous ceramics incorporates pores to improve several properties including thermal insulation maintaining inherenet ceramic properties such as corrosion resistance and large mechanical strength. Conventional porous ceramics is usually fabricated through an insufficient sintering. Since the sintering accompanies the exclusion of pores, it must be terminated at the early stage to maintain the high porosity, leading to degraded strength and durability. Contrary to this, we have innovated superplastically foaming method to make ceramic foams only in the solid state. In this method, the previously inserted foam agent evaporates after the full densification of matrix at around the sintering temperature. Closed pores expand utilizing the superplastic deformation driven by the evolved gas pressure. The typical features of this superplastically foaming method are listed as follows, 1. The pores are introduced after sintering the solid polycrystal. 2. Only closed pores are introduced, improving the insulation of gas and sound in addition to heat. 3. The pore walls are fully densified expecting a large mechanical strength. 4. Compared with the melt foaming method, this method is practical because the fabrication temperature is far below the melting point and it does not need molds. 5. The size and the location pores can be controlled by the amount and position of the foam agent.

Original languageEnglish
Title of host publicationIOP Conference Series: Materials Science and Engineering
Volume18
EditionSYMPOSIUM 12
DOIs
Publication statusPublished - 2011
Event3rd International Congress on Ceramics, ICC3 - Osaka, Japan
Duration: Nov 14 2010Nov 18 2010

Other

Other3rd International Congress on Ceramics, ICC3
CountryJapan
CityOsaka
Period11/14/1011/18/10

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ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

Cite this

Kishimoto, A., & Hayashi, H. (2011). Superplastically foaming method to make closed pores inclusive porous ceramics. In IOP Conference Series: Materials Science and Engineering (SYMPOSIUM 12 ed., Vol. 18). [182002] https://doi.org/10.1088/1757-899X/18/18/182002