The raw materials for ceramics are chosen on the basis of desired purity, particle size distribution, reactivity, and form. Purity influences such high temperature properties as strength, stress rupture life, and oxidation resistance. Impurities may severely influence electrical, magnetic, and optical properties. Particle size distribution affects strength.
Binders may be added to the ceramic powder to add strength prior to densification. Lubricants reduce particle-tool friction during compaction. Other agents are added to promote flowability during shaping.
Science EncyclopediaScience & Philosophy: Categorical judgement to ChimaeraCeramics - Traditional Ceramics, Glass, Aluminum Oxide, Silicon Carbide, Silicon Nitride, Processing, Forming Processes - Hydraulic cement, Modern ceramics, Magnesium oxide, Sintering, Machining