DEVELOPMENT of CERAMIC MATERIALS ZrO2–CeO2 of BIOENGINEERING APPLICATIONS

Zbìrnik naukovih pracʹ(2022)

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摘要
Method of composite materials formation based on particle-stabilized cerium dioxidezirconium nanopowders obtained from fluoride salt solutions has been investigated. The sintering ofthe powders was carried out by means of an electroconsolidation apparatus by hot pressing in avacuum chamber. X-ray phase analysis was performed on a Shimadzu XRD-6000 diffractometer.Phase analysis of the samples was carried out using the data base of the American Society for TestingMaterials. The surface morphology of the samples was investigated by scanning microscope JSM-6390LV. The most optimal method of nanopowders extraction was selected to produce solidnanostructured composites for bioengineering applications. Analysis of the microstructure of thesamples showed that the composite systems are composed of particles ranging in size from 100 nmto 1500 nm. The samples show pores and cracks, which can be associated with the passage of grainboundary diffusion in the process of electro-consolidation of the samples. Derivation of compositesbased on zirconium dioxide stabile at hot vacuum deposition by electrosintering makes it possible to obtain the high performance composites with high resistance to abrasion, hardness and thrustmodulus at a temperature of 1400 °C, a pressure of 30 MPa and a cycle time of 3 minutes. It wasfound that the method of electroconsolidation in vacuum provides the bonding of samples with highvalues of the Young’s modulus and friction strength. Mechanical characteristics of ceramic systemsbased on zirconium dioxide, molded with cerium oxide, have rather high values. The dependence ofchange in the relative specific gravity of the studied samples shows that the increase in temperatureof electroconsolidation, the overall level of composite density grows practically linearly, indicatinga good particle compatibility of the powders. The conducted studies allow us to assume that with thepurpose of further increasing of the properties of composites based on zirconium oxide, partiallystabilized by cerium dioxide, it is necessary to improve the homogeneity of the resulting sums andadd other oxides, in particular alumina oxide, alumina nitride, silicon oxide and magnesium oxide.
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ceramic materials zro2–ceo2,bioengineering applications
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