Lsh. Lum et al., STANDARD REFERENCE MATERIALS FOR PARTICLE-SIZE ANALYSIS OF CERAMIC POWDERS BY GRAVITY SEDIMENTATION, Powder technology, 87(3), 1996, pp. 233-238
Two standard reference materials (SRM), one a nitride powder and the o
ther of an oxide powder, of mean size in the range of 1.0 mu m, were d
eveloped to assist in the measurement and analysis of fine size powder
s. SRM 659, a silicon nitride powder and SRM 1978, a zirconium oxide p
owder, are intended for calibration and evaluation of instruments used
to measure particle size distribution using Sedigraph(R), a gravitati
onal sedimentation method. In the development of these SRMs, the param
eters of the powder deagglomeration procedures were studied to determi
ne their effects on the measured particle size distribution of powders
. The parameters studied included power output and time of sonication,
initial pH of the suspension, and dispersant concentration. The morph
ology, density, surface area, and surface chemistry of these powders w
ere also measured.