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Mfg. porous ceramic prods., esp. lightweight refractory bricks - from mixt. of clay and naphthalene which is melted out of the bricks and reclaimed, and where bricks have very low thermal conductivity
Mfg. porous ceramic prods., esp. lightweight refractory bricks - from mixt. of clay and naphthalene which is melted out of the bricks and reclaimed, and where bricks have very low thermal conductivity
A dry mixt. is made contg. raw ceramic materials, and milled naphthalene with a grain size below 1mm; then, a mixt. of water and naphthalene particles, pref. naphthalene sublimate with a particle size of ca. 0.01mm, is added to the dry mixt. The resulting mixt. is compacted or moulded; and the mouldings are heated so the naphthalene is driven out and reclaimed. The mouldings are then baked. The mixt. of water and fine naphthalene particles pref. also contains a liquefier and a fine clay forming a film on the naphthalene particles. As compared with similar, commercially-available bricks, these have a higher cold compression strength, and a significantly lower thermal conductivity.
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