Thermal conductivities of some lead and bismuth glasses
article
Thermal conductivities have been measured, mainly at 40°C, of glasses within the systems PbO-Bi2O3-SiO2, PbO-Bi2O3-Al2O3-SiO2, and BaO- (Bi2O3 or PbO) -SiO2. Aiming at lowest thermal conductivity, preference was given to glasses of low silica and low alumina contents. Glass formation persists at ratios O/Si or O/(Si+Al) well above 4. Factors representing the specific contributions of the individual oxides to the thermal conductivity (on a wt. % basis) have been calculated from the data at 40°C. The results clearly suggest a substantial decrease of the silicafactor when the glass structure changes from the conventional to the 'invert' type. A contrary behaviour of the alumina factor is found. The factor for bismuth trioxide is found to be opproximately one and a half times that of lead oxide.
TNO Identifier
283005
Source
Glass technology, 6, pp. 166-169.
Pages
166-169