Document Type : Research Paper
Authors
1
Department of Materials Engineering, University of Technology, Baghdad, Iraq.
2
Department of Materials Engineering, University of Technology, Baghdad, Iraq
3
Dep. of Prosthetics and Orthotics Eng., College of Engineering, Kerbala University, Iraq
Abstract
In this study, a novel technique of sintering at very low temperatures named the Cold sintering process is used to produce Highly dense samples of hydroxyapatite (HA) with liquid additives. The co precipitation method is a powder-preparation method to fabricate a nano hydroxyapatite. This work aimed to determine the optimum cold sintering parameters in producing dense HA samples using the Taguchi method. The sintering temperature, pressure, holding time, and liquid content were selected as the production parameters. The samples are characterized using scanning electron microscope (SEM), X-ray energy dispersive spectrometry (EDS), X-ray diffractogram (XRD), and transition electron microscope (TEM). Also, physical and mechanical properties measurements were detected, include density, water contact angle, Brunauer, Emmett, and Teller(BET), hardness and indirect tensile strength (DTS). It can be observed that the optimum cold sintering parameters for high densities (99%) and hardness (502 Hv) are 250 °C, 500 MPa, 60 minutes, and 10 wt.% liquid content. The presence of lattice water in co-precipitated HA particles together with liquid additives has an important effect on the densification. In summary, The results indicated that cold sintering could result in hydroxyapatite with high densification, high purity, and high thermal stability without decomposition.
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