Fabrication of calcite foam by inverse ceramic foam method

Tram Nguyen Xuan Thanh, Michito Maruta, Kanji Tsuru, Alireza Valanezhad, Shigeki Matsuya, Kunio Ishikawa

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

2 被引用数 (Scopus)

抄録

We have previously reported that calcite foam that had interconnected porous structure could be prepared by ceramic foam method and it transformed to carbonate apatite (CO3Ap). In the ceramic foam method, polyurethane sponge was used as a template. The polyurethane sponge was immersed in the ceramics slurry, and the strut of the polyurethane foam was covered by ceramic powder. After that it was dried and sintered at high temperature. Calcite foams produced by this approach were comprised of a three-dimensional (3D) interconnected porous structure that facilitated cell penetration. However, all foams have a common limitation: the inherent lack of mechanical strength associated with high porosity. Therefore, in this study, an inverse ceramic foam method was studied; multi polyurethane coating method using polyurethane foam as a template. In this study, the compressive strength was improved by an inverse replication allowed for decreasing porosity while at the same time maintaining the interconnectivity. The burnable synthetic resin coating layer was introduced onto struts of polyurethane foam to make the triangular struts become more round and thick, consequently producing large round capillary within the foam structure fulfilling the requirement for osteoblast colonization. In particular, polyurethane foam was dipped orderly into two monomers, followed by centrifugation to remove excess liquids inside foam. After resin curing, a layer of synthetic resin was coated strut of foam. Calcium hydroxide Ca(OH) 2 slurry was then infiltrated into resin coated-polyurethane foam. By firing at 600°C in O2-CO2 stream, polyurethane template was burnt off and Ca(OH)2 was converted into calcite. Negative replicated calcite foam was fabricated and characterized micro-structurally with interconnectivity and improved mechanical strength. The results obtained in this study suggested that this method dramatically improved the mechanical strength of the calcite foam without sacrificing the interconnected structure, and this means that the calcite foam obtained in this method could be precursors for the 3D interconnected porous CO3Ap foam.

本文言語英語
ホスト出版物のタイトルBioceramics 24
出版社Trans Tech Publications Ltd
ページ153-156
ページ数4
1
ISBN(印刷版)9783037855171
DOI
出版ステータス出版済み - 2013
イベント24th Symposium and Annual Meeting of International Society for Ceramics in Medicine, ISCM 2012 - Fukuoka, 日本
継続期間: 10 21 201210 24 2012

出版物シリーズ

名前Key Engineering Materials
番号1
529-530
ISSN(印刷版)1013-9826
ISSN(電子版)1662-9795

その他

その他24th Symposium and Annual Meeting of International Society for Ceramics in Medicine, ISCM 2012
Country日本
CityFukuoka
Period10/21/1210/24/12

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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