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New type of bioactive materials: Hydroxyapatite/α-wollastonite composites

Ryu, HS and Lee, JK and Kim, H and Hong, KS (2005) New type of bioactive materials: Hydroxyapatite/α-wollastonite composites. Journal of Materials Research, 20 (5). 1154 - 1163. ISSN 0884-2914

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A new type of bioactive materials, hydroxyapatite (HA)/ α-wollastonite (α-Wol) composites, were prepared. The sintering behavior, phase evolution, and in vitro bioactivity of hydroxyapatite/α-wollastonite composites were examined. The properties of HA/α-Wol composites were quite different from those of HA ceramics or α-Wol ceramics. HA/α-Wol composites sintered 1300 °C for 2 h exhibited a dense microstructure consisting of grains in the range of 0.3-1.0 μm in diameter. During sintering, a complex phase evolution between HA and α-Wol was observed. At 1300 °C, the formation of the Si substituted HA and the additional α-tricalcium phosphate (TCP) were observed using Fourier transform infrared and x-ray diffraction analysis. Further heat treatment at 1350 °C transformed part of the HA and α-Wol into a new phase with the composition: Ca12P6 Si2O31. The in vitro bioactivity of the HA/ α-Wol composites with a weight ratio of 25:75 and 50:50 sintered at 1300 °C was better than that of α-Wol monophasic ceramics. This result revealed that the silica of α-Wol and the orthosilicate of Si substituted HA provided nucleation sites for the bonelike apatite layer. The phosphate present in the HA or α-TCP phases promoted the nucleation of a bonelike apatite layer on the surface of the composites. The dissolution rate of α-Wol phase in simulated body fluid was faster than α-TCP or HA phase. Therefore, HA/α-Wol composite is the bone replacement material of controllable bioactivity and degradation rate with relative content between HA and α-Wol phase. © 2005 Materials Research Society.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Ryu, HS
Lee, JKjul37@pitt.eduJUL370000-0002-7778-7679
Kim, H
Hong, KS
Centers: Other Centers, Institutes, Offices, or Units > Petersen Institute of NanoScience and Engineering
Date: 1 May 2005
Date Type: Publication
Journal or Publication Title: Journal of Materials Research
Volume: 20
Number: 5
Page Range: 1154 - 1163
DOI or Unique Handle: 10.1557/jmr.2005.0144
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 0884-2914
Date Deposited: 19 Nov 2014 20:16
Last Modified: 22 Jun 2021 20:55


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