Superplastically foaming method to make closed pores inclusive rigid ceramics

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Porous ceramics incorporates pores to improve several properties including thermal insulation maintaining inherent 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 foam 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, the superplastically foaming method is practical because the fabrication temperature (around the sintering temperature) is far below the melting point and it does not need mold. 5. The size and the location of pores can be controlled by the amount and position of the foam agent. In this chapter we introduce the superplastically faburicated ceramics mainly focused on the combination of 3 mol% yttria stabilized zirconia (3YSZ) and a silicon carbide (SiC) as matrix and foam agent, respectively.

Original languageEnglish
Title of host publicationAdvances in Porous Ceramics
PublisherNova Science Publishers, Inc.
Pages111-124
Number of pages14
ISBN (Electronic)9781634858601
ISBN (Print)9781634858397
Publication statusPublished - Jan 1 2016

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)

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  • Cite this

    Kishimoto, A. (2016). Superplastically foaming method to make closed pores inclusive rigid ceramics. In Advances in Porous Ceramics (pp. 111-124). Nova Science Publishers, Inc..