Sintering effects in a glass reinforced hydroxyapatite

• Type: Article in International Scientific Journal
• Date: 1996

Authors

Knowles, JC (Author) Other; Talal, S (Author) Other; Santos, JD (Author) FEUP

Journal

Title: Biomaterials

Vol. 17 No. 4

Pages: 1437-1442

ISSN: 0142-9612

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 57 Citations

ISI Web of Science

Scopus - 65 Citations

COMPENDEX

Scientific classification

FOS: Engineering and technology > Environmental biotechnology

CORDIS: Technological sciences > Technology > Biotecnology ; Technological sciences > Engineering > Biomaterial engineering

Other information

Authenticus ID: P-001-E14

DOI: 10.1016/0142-9612(96)87287-5

Abstract (EN): Glass was incorporated into hydroxyapatite (HA) to act as a sintering aid in order to improve the mechanical properties. The glass was added at 2 and 4 wt% and the powders compacted uniaxially. The compacts were sintered at a variety of temperatures (1200, 1250, 1300 and 1350 degrees C) and the effects of the glass addition and the firing temperature were studied to determine their effects on the sintering process. It was found that the glass promoted so me phase changes, related to the amount of glass added to the composite. At 1200 and 1250 degrees C, some beta-tricalcium phosphate (TCP) was found with the residual being HA. However, at 1300 and 1350 degrees C, both beta- and alpha-TCP were formed. The 4 wt% addition, as expected, promoted higher levels of secondary phases in the composite. The flexural bend strength (FBS) showed high values and also significant differences dependent on the amount of glass added. A 2 wt% addition gave a gradual increase in FBS with temperature. With a 4 wt% addition there was an increase in FBS, but above 1300 degrees C there was a rapid decrease. These effects were mirrored in the linear shrinkage. Both the linear shrinkage and the FBS results were attributed to both the phase changes occurring and also change in grain size with increasing firing temperature. (C) 1996 Elsevier Science Limited

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6