結晶またはガラス粒子が分散したガラスマトリックス複合体の押込み硬さ

抄録

A theoretical analysis is made to the indentation hardness of two-phase, glass matrix composites containing spherical crystalline or glass particles. It is hypothesized that glass is an elastic-plastic solid on a microscopic scale. In the case of a hard particle dispersion, the composite hardness depends on the matrix hardness, the volume fraction of dispersed phase, the elastic properties of the two phases and also the matrix flow stress. In the case of a soft particle dispersion, however, the hardness and the elastic moduli vary in parallel with the volume fraction of dispersed phase. Experimental results of the Vickers hardness of phase-separated PbO-B₂O₃ glasses are used for the varification of the theory. Attempts are also made to interpret published hardness data for glass-ceramics in terms of their microstructure and the properties of the constituent phases. The theory explains well the hardness behavior of phase-separated glasses and glass-ceramics having particulate microstructure.