Certification of Ceramic Particle Size Distribution Reference Materials at NIST
James F. Kelly, P Pei
The availability of certified or reference particle size distributions has become increasingly important for the testing and certification of equipment used in size analysis. We describe here the currently available NIST Standard Reference Materials (SRMs) for particle size, and discuss their development and production. The development includes selection, blending, sampling, and measurement of powders by different techniques and comparison of those techniques. The sizing techniques used are selected from the following: imaging by light or electron optical microscopy, sedimentation, light scattering, and electric zone sensing. Although the particle size SRMs include a variety of compositions for applications in specificceramic industries, the broadest range of sizes is available in the glass bead materials. The spherical shape, known density, and known optical index of the glass materials make them a model material for calibration of instruments for powder measurements. The discussion will detail the certification of a new glass bead reference material, SRM 1004b, and two new Tungsten Carbide Cobalt reference materials.
American Ceramic Society Bulletin
ceramic, material, microscopy, particle, powder, reference, SEM, size, SRM