INFLUENCE OF THE LUBRICANT ON THE TECHNOLOGICAL PROPERTIES OF COMPLEX FILAMENTS FROM OXIDE REFRACTORY FIBERS

Various methods of applying lubricants to the surface of ceramic oxide fibers after firing have been tested. It is shown that the contactless method of applying the lubricant reduces the breakage of fibers during rewinding. The selection and testing of lubricant compositions that improve technological properties during textile processing operations have been carried out. Comparative tests for breaking load and flexibility of multifilament yarns oiled with different compositions have been carried out. Rigidity, adhesion and breakage during unwinding from the package are assessed.

A comparative Study of Physic-Chemical Properties of Certain Cerium Doped Li7La3-xCexZr2O12 Ceramic Oxides

Solid-state electrolytes have emerged as a promising alternative material for next-generation Li-ion batteries due to their safety and reliability. In this investigation, we report the synthesis of Cerium(Ce) doped Li7La3Zr2O12(LLZO) ceramic oxide which has a garnet-like structure and in which Ce3+ typically occupies La3+ sites. The synthesised LLZO ceramic oxide is doped with various weight percentages of cerium(Ce3+) by sol-gel method using oxalic acid as a complexing agent and ethane-1,2-diol as a surface-active agent. The synthesised Li7La3-xCexZr2O12 garnet is screened for surface morphology, chemical composition, and phase transition by various analytical techniques. The surface morphology and composition were analysed by HR-SEM with EDX analysis respectively. The cubic face formed was confirmed by XRD results. Thermogravimetric analysis indicates the thermal stability of the prepared materials. The effect of addition of various weight percentages of cerium with LLZO on ionic conductivity was analysed using ac impedance spectroscopy and compared. The maximum ionic conductivity measured was 6.34×10-5Scm-1. The potential window was examined by cyclic voltammetry (CV), which showed that the lithium deposition and dissolution peak appeared around 0V.Li+/Li and no further reaction beyond 5.8V vs Li+/Li.The results showed that these materials could be used as a potential alternative material in the fabrication of lithium-ion batteries.