C CHEMISTRY; METALLURGY
C04 CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
C04B LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
2235/00 Aspects relating to ceramic starting mixtures or sintered ceramic products
C04B2235/65 Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
C04B2235/66 Specific sintering techniques, e.g. centrifugal sintering
C04B2235/661 Multi-step sintering
C04B2235/662 Annealing after sintering