B_2O_3-PbO ガラスの弾性的性質およびビッカースかたさについて

概要

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The elastic constants and Vickers hardness of B_2O_3-PbO glasses have been determined. The data obtained for Vickers hardness, isotropic wave velocities, bulk modulus, shear modulus and Young's modulus are listed in Table I and II together with the density and molar volume. The variation of these data with composition of the glasses are shown in Fig. 1〜3. It can be seen that both the elastic constants and Vickers hardness increase with increasing PbO content up to its maximum value at about 42 mole percent PbO and then decrease; that is, beyond this further addition of PbO produces a softer glass. The increase of the elastic constants and hardness in the composition range of approximately 20〜42 mole percent PbO is interpreted based on the evidences that the four-co-ordinated borons are present and the type of lead-oxygen association becomes more covalent bonding.
社団法人日本材料学会の論文
1974-02-15