Processing and properties of transparent hydroxyapatite and beta tricalcium phosphate obtained by HIP process

作者：Boilet Laurent^*; Descamps Michel; Rguiti Emmanuelle; Tricoteaux Arnaud; Lu Jianxi; Petit Fabrice; Lardot Veronique; Cambier Francis; Leriche Anne

来源：Ceramics International, 2013, 39(1): 283-288.

DOI：10.1016/j.ceramint.2012.06.023

• Sintering
• Hydroxyapatite
• beta-Tricalcium phosphate
• Mechanical properties

Stoichiometric beta-tricalcium phosphate (beta-TCP) and hydroxyapatite (HA) powders were synthesized by chemical precipitation of aqueous solutions of diammonium phosphate and calcium nitrate. After a calcination treatment and a milling step, the powders were shaped by slip casting. The sintering temperature effect on the relative density and the average grain size was investigated. By natural sintering at 1200 and 1120 degrees C, densities of 98% and 99% were obtained for HA and TCP, respectively. After determination of minimum temperatures to obtain only closed porosity and a pre-sintering at these temperatures, hot isostatic pressing (HIP) treatment was carried out. Transparent or translucent samples were obtained, indicating a relative density very close to the theoretical value (>99.9%). Mechanical properties (three-point bending strength, fracture toughness, Young's modulus and Vickers hardness) were measured on both materials with similar grain size (similar to 1 mu m). Bending strengths of 181 and 105 MPa were measured for TCP and HA, respectively.

• 出版日期2013-1