Effect of AlF3, CaF2 and MgF2 on hot-pressed hydroxyapatite-nanophase alpha-alumina composites

被引：12

作者：

Evis, Zafer ^{[1
]}

Doremus, Robert H. ^{[2
]}

机构：

[1] Middle E Tech Univ, Dept Engn Sci, TR-06531 Ankara, Turkey

[2] Rensselaer Polytech Inst, Troy, NY 12180 USA

来源：

MATERIALS RESEARCH BULLETIN | 2008年 / 43卷 / 10期

关键词：

ceramics; chemical synthesis; X-ray diffraction; mechanical properties;

D O I：

10.1016/j.materresbull.2007.10.032

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

Nanophase alpha-alumina and hydroxyapatite composites (with and without 5 wt% AlF3, CaF2 or MgF2 added separately) were hot pressed at 1100 degrees C and 1200 degrees C to investigate their mechanical properties and phase stability. Hydroxyapatite slightly decomposed to tri-calciurn-phosphate when there was no F- present. With the addition of AlF3, CaF2 or MgF2 into the composite, it improved its thermal stability and mechanical properties. Substitution of OH- by F- ions in hydroxyapatite was verified by the change in hydroxyapatite's hexagonal lattice parameters and unit cell volume. A fracture toughness of 2.8 MPa root m and mu-hardness of 8.25 GPa were calculated for the composite containing CaF2 after the hot pressing at 1200 degrees C. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：2643 / 2651

页数：9

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