Making terracotta object such as roofing tiles and bricks, by mixing water and clay with clay fraction corresponding to particles, forming mixture of water and clay to obtain greenware, and firing greenware to obtain terracotta object

摘要

The process comprises mixing water and clay with a clay fraction corresponding to particles with a size of less than 40 mu m, forming the mixture of water and clay to obtain a greenware, firing the greenware at a temperature of 900-1160[deg] C to obtain a terracotta object, placing a solid mixture consisting of 40 mass% of clay fraction and degreasing agent such as feldspar in a slurry including 47% of water relative to dry mass, and die casting the slurry under pressure in a porous mold to obtain the greenware. The clay has montmorillonite of less than 10%, and illite of less than 20%. The process comprises mixing water and clay with a clay fraction corresponding to particles with a size of less than 40 mu m, forming the mixture of water and clay to obtain a greenware, firing the greenware at a temperature of 900-1160[deg] C to obtain a terracotta object, placing a solid mixture consisting of 40 mass% of clay fraction and degreasing agent such as feldspar in a slurry including 47% of water relative to dry mass, and die casting the slurry under pressure in a porous mold to obtain the greenware. The clay has montmorillonite of less than 10%, and illite of less than 20%. A silicate (0.1-0.5 mass%) and a carbonate (0.025-0.5 mass%) are added in the solid mixture. The solid mixture is crushed for a period of 6 hours. A draining agent is added in the slurry.