CHARACTERISTIC GRAIN SIZE: PART Ⅱ MEASURING PRINCIPLES

来源期刊：中南大学学报(英文版)1997年第2期

论文作者：Cao Shunhua David C Lam

文章页码：117 - 119

Key words：characteristic grain size; measuring principle; gas adsorption technique; porous material; fullydense single phase materials; material with isolated second-phase particles

Abstract: The principles for measuring characteristic grain sizes of materials, such as fully-dense single phase materials, porous materials and materials with isolated second phase particles, are developed on the basis of its definition associated closely with the surface area per unit volume, S_v, of grain. The focus of the measuring principles of the characteristic grain size is put on determining Sv of grains. Unlike the measurement of average grain size commonly used, G, correcting factors such as grain shape and grain size distribution factors, will not be applied to the determination of the characteristic grain size, G_c, due to its unique geometric meaning and the measure precision of S_v being guaranteed by quantitative stereological technique and gas adsorption method. The measurement of G_c can be directly carried out on the polished and etched cross section of materials, similar to the measuremernt of the average grain size using the Heyn intercept method.