| 摘要 |
PROBLEM TO BE SOLVED: To ensure superior lightness by compacting a ceramic compacting compsn. consisting essentially of coal ash, an inorg. binder, a hardening regulating agent and inorg. hollow granules and firing the resultant compact. SOLUTION: A ceramic stock compsn. is prepd. by mixing 100 pts.wt. coal ash such as fly ash with 10-150 pts.wt. inorg. binder made of a water-soluble phosphate such as aluminum prim. phosphate, 75-100 pts.wt. inorg. hollow granules having 0.01-2mm average diameter and a true specific gravity of 0.05-0.8, e.g. Shirasu (volcanic glass) balloons, 1-30 pts.wt. hardening regulating agent made of oxide or hydroxide of a metal such as Al or Mg and 5-30 pts.wt. water as an optional component. The compsn. is filled into a metallic mold of a prescribed shape, precompacted at 50-100 deg.C under 1-500kg/cm<2> pressure and fired at 300-600 deg.C in an oxygen-contg. atmosphere or an inert gaseous atmosphere to obtain the objective lightweight ceramic compact. |
