Calcium hydroxyapatite $(HA: Ca_{10}(PO_4)_6(OH)_2)$ and tri-calcium phosphate $(TCP: Ca_3(PO_4)_2)$ are the most important calcium phosphate compounds of synthetic bone applications. The production of these compounds, by using chemical synthesis techniques, was only proven to be possible over the period of last thirty years. HA is "bioinerf and TCP is "bioresorbable" in physiological environments. Moreover, the calcium hydroxyapatite phase constitutes the inorganic lattice of natural bones. Pure HA, pure TCP and/or HA-TCP composite powders have been synthesized, within the context of this study, by the use of chemical precipitation techniques either in pure water or in "synthetic body fluids," whose compositions were developed in our laboratory. HA powders produced by chemical precipitation routes do possess sub-micron particles of extremely high surface reactivity, and therefore, they easily density during any consecutive sintering stage, which is an integral part of bioceramic material processing and production processes, and by the end, such powders lead to the formation of "pore-free" microstructures. In this study, open and inter-connected porosity, starting from the few microns-range extending to pores of 150 to 200 microns diameter have been tried to be incorporated into the calcium hydroxyapatite bioceramic parts, by using the "foaming" technique. This method was proven to be successful and the calcium hydroxyapatite parts produced in this study possessed microstructures simulating the novel morphology of natural bones.