Use of neutron-activation analysis in order to evaluate chemical inhomogneity in aluminum-nitride ceramics

The possibilities of neutron-activation analysis for monitoring the uniform ity of yttrium distribution in aluminum nitride ceramics with additions of yttrium oxide are studied. The results are processed by a two-factor disper sion analysis scheme. The roles of individual sintering factors, liquid pha se content and also the method for charge preparation on the uniformity of yttrium-containing phase distribution and migration are established. Sinter ing conditions are recorded that provide the best indices for uniform yttri um distribution in the nitride ceramic obtained.