A composition consisting essentially of (a) 1 to 30 wt. % of a hydrogen phosphate selected from the group consisting of mono and dihydrogen phosphates of sodium, potassium, ammonium, magnesium, calcium, aluminium, zinc, iron, cobalt, and copper; (b) 1 to 40 wt. % of a compound selected from the group consisting of oxides, hydroxides, and oxide hydrates of magnesium, calcium, iron, zinc, and copper; (c) 40 to 95 wt. % of a particulate filler selected from the group consisting of glass; mono-, oligo- and poly-phosphates of magnesium, calcium, barium and aluminium; calcium sulfate; barium sulfate; simple and complex silicates; simple and complex aluminates; simple and complex titanates; simple and complex zirconates; zirconium dioxide; titanium dioxide; aluminium oxide; silicon dioxide; silicon carbide; aluminium nitride; boron nitride and silicon nitride; and (d) 0 to 25 wt. % of a constituent that differs from constituents (a) to (c).

Silicon dioxide-containing thermal-insulation sheet hydrophobized throughout with hardened surface, wherein the compressive stress at fracture measured on the sheet surface is higher than the compressive stress at fracture measured on the sectional surface in the middle cross section of the sheet parallel to the sheet surface, at, in each case, the same penetration depths of the measurement probe in the test specimen.

Silicon dioxide-containing thermal-insulation sheet hydrophobized throughout with hardened surface, wherein the compressive stress at fracture measured on the sheet surface is higher than the compressive stress at fracture measured on the sectional surface in the middle cross section of the sheet parallel to the sheet surface, at, in each case, the same penetration depths of the measurement probe in the test specimen.

Disclosed is a multi-phase abradable coating including a ceramic matrix and a dislocator phase.

Disclosed is a multi-phase abradable coating including a ceramic matrix and a dislocator phase.

Disclosed is a multi-phase abradable coating including a ceramic matrix and a dislocator phase.

Disclosed is a multi-phase abradable coating including a ceramic matrix and a dislocator phase.

The present invention relates to a process for producing a hydrophobized shaped thermal-insulation body, comprising pressing or compacting a thermal-insulation mixture containing a silica, an IR opacifier, an organosilicon compound A and an organosilicon compound B, wherein organosilicon compound A is hexamethyldisilazane (HMDS) and organosilicon compound B corresponds to a substance of the formula R.sub.nSiX.sub.4-n, where R=hydrocarbyl radical having 1 to 18 carbon atoms, n=0, 1 or 2, X=Cl, Br or alkoxy group OR.sup.1 where R.sup.1=hydrocarbyl radical having 1 to 8 carbon atoms, or organosilicon compound B corresponds to a silanol of the formula HO[Si(CH.sub.3).sub.2O].sub.mH, where m=2-100.

The present invention relates to a process for producing a hydrophobized shaped thermal-insulation body, comprising pressing or compacting a thermal-insulation mixture containing a silica, an IR opacifier, an organosilicon compound A and an organosilicon compound B, wherein organosilicon compound A is hexamethyldisilazane (HMDS) and organosilicon compound B corresponds to a substance of the formula R.sub.nSiX.sub.4-n, where R=hydrocarbyl radical having 1 to 18 carbon atoms, n=0, 1 or 2, X=Cl, Br or alkoxy group OR.sup.1 where R.sup.1=hydrocarbyl radical having 1 to 8 carbon atoms, or organosilicon compound B corresponds to a silanol of the formula HO[Si(CH.sub.3).sub.2O].sub.mH, where m=2-100.

Compositions useful for foundry processes such as green sand casting are discussed. The compositions may comprise an aggregate, at least one inorganic binding agent, and at least one high aspect ratio silicate. For example, the composition may comprise sand, one or more clay materials serving as a binding agent, and a high aspect ratio silicate chosen from mica, talc, or a combination thereof. The composition may be formed into a green sand mold for use in casting molded articles. Incorporation of the high aspect ratio silicate may help to improve the quality of the casted article.