Fracture toughness and temperature dependence of Young's modulus of a sintered albite glass

Abstract

Albite glass is an important component in many ceramic compositions, often used as liquid phase during the sintering process. Nevertheless, in spite of its almost ubiquous presence in the final microstructure of these compositions, some properties such as Young's modulus or fracture toughness have not been extensively studied in literature. This paper presents an experimental study on a sintered albite glass obtained from sodium feldspar powder. The microstructure of the resultant amorphous solid was analyzed via scanning electron microscopy and x-ray diffraction.. Fracture toughness was determined at room temperature from the critical stress intensity factor (K IC) with a three point bending single-edge notched test (SENB). Young's modulus and coefficient of thermal expansion (CTE) were measured as a function of the temperature. A value of CTE of 6.6×10-6 ºC-1 within the temperature range 300-500ºC was found. The Young's modulus values of the albite glass were within the range from 63.6 to 65.2 MPa. SENB tests revealed a fracture toughness of K IC = 0.78 ± 0.06 MPa 1/2 , which is similar value to those found for borosilicate and soda-lime glasses.

Understanding the structural origin of intermediate glasses

“…High‐temperature Young's modulus values for albite glass measured by Bó et al are lower than ours because they used a sintering process for synthesis that resulted in a porosity of 5% in the glass. Among all of the intermediate glasses identified in this work, albite is a unique one, whose E , B , and μ all stay nearly constant over a large temperature range as seen in Figure .…”

“…Physical properties of glasses studied in this work are shown in Table . Density of albite measured in this study was found to be slightly lower than the density of 2.382 g/cc reported by Taylor et al and higher than the value of 2.28 g/cc reported by Bó et al Refractive index of albite glass was found to match the reported value of 1.49 by Carter et al…”

“…Brillouin longitudinal frequency shift of albite glass, a glass derived from the naturally occurring sodium feldspar, was found to remain constant with temperature . Although albite is an extensively studied glass in the geology community, all of its elastic constants at high temperature have not been reported to our best knowledge . By using in situ high‐temperature Brillouin light scattering (BLS) technique in this study, we found that all of the elastic moduli of albite glass remain constant up to its glass transition temperature ( T g ) and above.…”

Scale‐Up of BiVO4 Photoanode for Water Splitting in a Photoelectrochemical Cell: Issues and Challenges

“…Ah ump appears in the range 20-408 in the XRD patterns,w hich is presente ven for the FTO glass.T his could be attributed to theamorphous glass. [39] CoPi beingamorphous wasn ot detected by XRD. It is importantt on otet hatt races of any crystalline impurities were not detected by XRD.…”

Fabrication of oxide pellets containing lumped Gd2O3using Y2O3-stabilized ZrO2for burnable absorber fuel applications

“…52 Therefore, the absence of the interfacial cracks in the oxide pellets containing mini-pellet sintered at 1400°C or less could be attributed to the mismatch stresses reduction due to a lower initial density of the lumped Gd 2 O 3 before the insertion. The residual stress can be changed not only by changing the thermal expansion coefficient but also by changing the elastic constant, which depends on the material density.…”