Characterization of Low-Level, Oversize Particles in Abrasive Powders

Abstract

Abrasive powders are used in fine grinding and polishing applications many of which require defect-free surfaces. Scratching is a primary defect that can be caused by very low levels (less than 10 ppm) of large, oversize particles in the powders. Powders containing low levels of oversize particles can escape the scrutiny of quality control efforts because particle size analysis techniques have detection and sensing limits that prevent detection and quantification. This paper describes several common size analysis techniques with special regard to the limits of detecting oversize particles. Recommendations are described for measuring and quantifying low levels of oversize particles in powder size ranges of greater than and less than 10 microns.

Keywords

• diamond
• abrasives
• powders
• size analysis
• oversize