Hydroxyapatite (HAp) is the most promising bioceramic material for orthopedic applications because of its similarity in chemical structure to living bone and teeth(with wide porosity ranges).Several methods are there to produce pours HAp. The simplest method involves the incorporation of volatile compounds during the heating process. Here HAp synthesized from used egg shells is used as the raw materials and some organic additives like naphthalene are used as the ortganic additives. Porous HAp ceramics with porosity up to 53% have been successfully and rapidly fabricated. The porosity of the ceramics can be controlled by adjusting the starting material, green density, sintering time, or temperature. Pore size can also be adjusted. The addition of organic additives like naphthalene in the green specimens help in adjusting porosity.
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