DUCTILE CERAMICS Ⅱ - INTRODUCTORY STUDY OF DUCTILITY IN POLYCRYSTALLINE SODIUM CHLORIDE AND MAGNESIUM OXIDE

摘要

Methods for producing ductile polycrystalline ceramic-type materials were investigated. Various types of treatments were used for sodium chloride;these can be divided into three categories:surface treatments of the crystallites, surface treatments of the compacted specimens, and bulk treatments. The most effective method for producing ductility was to deposit a small quantity of silver on the individual crystallites by vapor deposition. The silver apparently acts as a specific surface-active agent. A treatment using static acid was also successful in producing ductility, but it was not as effective as that using silver.nThus far, no ductility has been produced in polycrystalline magnesium oxide, since the required sintering causes loss of the desired metallic deposits.