Nitrogen And Fluoride Doping On P-yttrium Aluminum Silicate Glass Structure And Performance Impact

Due to its excellent thermal and mechanical properties,yttrium aluminum silicate glass has been extensively studied in the military,architectural,and biological fields,but yttrium aluminum silicate glass still has high melting temperature,high viscosity,and low transmittance.It is a problem that needs to be solved urgently.This paper takes 59SiO₂-19Al₂O₃-6Y₂O₃-16CaO（mol%）glass as the research object.The mechanical properties of yttrium aluminum silicate glass with different contents of nitrogen and fluoride were studied by electronic universal material testing machine,three-head grinding and polishing machine and Vickers microhardness tester,and the structure was characterized by Fourier infrared spectroscopy.DSC and thermal dilatometer were used to determine the glass transition temperature,expansion softening temperature and coefficient of thermal expansion respectively.The surface precipitation and transmittance of the glass were studied by SEM,EDS,XRD and visible light transmittance.Material properties and viscous activation energy,the results show that:During the fluoride doping process,F ions replace the bridge oxygen position,making the bridge oxygen into non-bridge oxygen,increasing the amount of free oxygen in the yttrium aluminosilicate glass structure.Ca²⁺in the glass structure doped with a small amount of fluoride yttrium aluminosilicate can capture part of the free oxygen and have an accumulation effect on the network.When the fluoride is 0-2 mol%,the viscosity,bending strength,abrasion resistance and Vickers microhardness of the yttrium aluminosilicate glass all increase,and the amount of doping continues to increase,as does the amount of free oxygen With the increase,viscosity,bending strength,wear resistance and Vickers microhardness decrease with the increase of fluoride doping amount,and the expansion softening temperature gradually decreases with fluoride doping.The glass transition temperature increases first and then decreases,and the extreme value appears when the fluoride is doped with 4 mol%.The network connection degree of nitride-doped yttrium aluminum silicate glass increases,and at the same time,the glass transition temperature,expansion softening temperature,wear resistance,bending strength and Vickers microhardness all increase with the amount of nitride doped Increase and increase.However,the more the amount of nitride doping,the more obvious the decrease in glass transmittance.The samples No.N1-N3 change from transparent to gray,and the samples No.N4 and N5 appear black.Nitrogen and fluoride co-doped yttrium aluminosilicate glass,its viscosity decreases,the material properties increase,the melt structure is improved,and the melting temperature is reduced,the bending strength,wear resistance,dimension of the yttrium aluminum silicate glass Both microhardness and density have decreased.Compared with samples F1,NF1 and N5,the single-doped nitride glass structure is the densest,the melting temperature is high,and the co-doping of nitrogen and fluoride can obtain yttrium aluminosilicate glass with moderate melting temperature and excellent mechanical properties.