Porous particle composites

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

There are a variety of methods which can be utilized to produce porous or cellular solids in the case of monolithic metals. Existing metallic foams fabricated by introducing gas into molten metals before solidification and artificial honeycomb structures are typical examples. Indeed, there is a great need for advanced structural and functional materials which over weight reduction in terms of high specific modulus and specific strength. However, in the case of metallic foams, as presented by Gibson and Ashby [1], the Young’s modulus of the foam Ef decreases monotonically with the increase in porosity as follows: E f =E s = Cφ 2fs ) 2 + C’(1-φ)(ρ fs ) where subscripts f and s denote foam and bulk respectively, is density, and C, C0 and are constants. This equation shows that the specific modulus also decreases with increasing porosity. A similar situation exists with regards to both the tensile and compressive strength of foams [1]. To realize low-density structural materials, high property-to-weight ratios are required in comparison with the corresponding bulk materials. This is a difficult target to reach, but in this chapter the feasibility of achieving such high specific properties by incorporating porosity into ceramic particle reinforced composites will be discussed. In such composites, rigid ceramic materials bear external loading and the incorporated pores contribute to a reduction in weight and enhancement of other additional properties. Their limited exploitation as structural materials arises from a poor understanding of the mechanical behaviour of these porous composites.

Original languageEnglish
Title of host publicationMetal and Ceramic Matrix Composites
PublisherCRC Press
Pages350-366
Number of pages17
ISBN (Electronic)9781420033977
ISBN (Print)9780750308724
Publication statusPublished - Jan 1 2003
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Engineering(all)
  • Materials Science(all)

Cite this

Toda, H. (2003). Porous particle composites. In Metal and Ceramic Matrix Composites (pp. 350-366). CRC Press.