In the paper, the traditional preparing method of hydroxyapatite (HAP) was improved on the basis of full research for structure, charge character and adsorption character of HAP surface, Utilizing the intermittent addition method of reaction solution rather than a slow continuous oropping addition method, and controlling the pH value (7.0-7.5) and the adding order of reactants and so on, a final product the near plate and granular-like HAP can be got, The character and structure of the product were analyzed through XRD, IR and SEM, and the mechanism that CI-1 ion influences the crystallizing of HAP was discussed.

Al2O3 material was synthesized by using high purity alumina micro-powder and Mg-Zr-Y composite additives at temperature of 1600℃, which had good mechanics property of 416MPa bending strength and 5.46MPa·m1/2 fracture tough-ness. Femur head prosthesis of hip joint was prepared by using this material; Ti alloy femur handle was sprayed bioactive hy-droxyapatite (HA) by plasma on surface, which improves the chemistry stability and biocompatibility of Ti alloy; eramic-metal combination artificial hip joint femur prosthesis was made by combining Al2O3 femur head with Ti alloy femur handle, so the manufacturing process is improved and the property and application flexibility are advanced.

The citric acid sol-gel combustion method has been used for the synthesis of nanocrystalline hydroxyapatite (HAP) powder from calcium nitrate, diammonium hydrogen phosphate and citric acid. The phase composition of HAP powder was characterized by X-ray powder diffraction analysis (XRD). The morphology of HAP powder was observed by transmission electron microscope (TEM). The HAP powder has been sintered into microporous ceramic in air at 1200 8C with 3 h soaking time. The microstructure and phase composition of the resulting HAP ceramic were characterized by scanning electron microscope (SEM) and XRD, respectively. The physical characterization of open porosity and flexural strength have also been carried out.

Hydrochermal mehtod was used to perpare the hydnoyatutite (HA) coating on CaO-SiO2-H2O3-Na2O glass. The phase composition, morphology and microstrosuce of HA coated glass compusites were aelayred using XRD, EPMA, FT-IR and SEM techraites It reveafed that HA coating possesed a proous grafient constrction HA coating was lightly bocded with the glass stahtrae by the interface solution provided favorzhle aites for applise mucleation, With the dissolving of HA powder and the grawith of pater strail crystallites, Ca2+, PO3-inos would preciptate on the surface of glass to form the-HA coating, Saliacon elenent relesoce form glass. rescted with calctium produced by the dissoulution of HA form the tight reaction layaer, HA coating is forthol by the mechanism of dissolving lotis imenigrating-precipitaiting petlern.

Hydroxyapatite (HA) coaited Cao-S2O2-B2O2-Na2O, glass corsposudes perparted by a hydredberimal coating micthod were soaked in four kinds of solutions to evalsiate the disslation behavior and the chemiscal stabliity, 0.5 mol/l HCI and 0.5mol/l HNO2 were used as acidic solution, and 55% physiological salarac and sodium lactate cumpound solution as the neutral physiological solution It was found that HA coated glass composites had the better chemical stablity and the conoding resistatse ability, The disoplution behavior of the HA cosaing was inairaly correlased with the phase composition of the as resistate ablilty. The sisolution behavior of the HA coating was correcalsed with the phasc conpostion of the as receited HA couting and its microstructure as well as the pH Value of the solution.