Refractory articles and composite metal-ceramic articles (cermets) prepared from a silicate-containing aluminum titanate
AssigneeRosenthal Technik AG
InventorsHartmut Keller, Axel Krauth, Horst R. Maier, Horst Nink, Hans J. Pohlmann, Horst Reddig, Johann Siebels
Life of this patent
Estimating the term…
Abstract
Refractory products such as foundry articles and composite metal-ceramic articles are prepared from a sepiolite (2 MgO.3SiO.sub.2.2H.sub.2 O) and silicate containing aluminum titanate.
Claims6
An article having a thermal shock coefficient R of 130 to 180 (W/cm), a heat insulation factor .lambda. of 0.01 to 0.03 (W/cm K), a coefficient of expansion AK of .+-.0.5.times.10.sup.-6 /.degree.C., an elasticity modulus of approximately 1.4.times.10.sup.3 (g/mm.sup.2) and a transverse strength .delta..sub.B of about 4.4 (g/mm.sup.2) and a crushing strength .delta..sub.D of about 77 (g/mm.sup.2), the article being non-wettable in respect to most NE metals and being alkali-resistant prepared from a silicate-containing aluminum titanate of raw ingredients having a grain size of below 0.6 .mu.m and a chemical composition consisting essentially of from 50 to 60 weight % Al.sub.2 O.sub.3, 40 to 45 weight % TiO.sub.2, 2 to 5 weight % kaolinite and 0.1 to 1 weight % sepiolite.
An article having a thermal shock coefficient R of 130 to 180 (W/cm), a heat insulation factor .lambda. of 0.01 to 0.03 (W/cm), a coefficient of expansion AK of .+-.0.5.times.10.sup.-6 /.degree.C., an elasticity modulus of approximately 3.5.times.10.sup.3 (g/mm.sup.2) and a transverse strength .delta..sub.B of about 5.7 (g/mm.sup.2) and a crushing strength .delta..sub.D of about 93.5 (g/mm.sup.2), the article being non-wettable in respect of most NE metals and being alkali-resistant prepared from a silicate-containing aluminum titanate of raw ingredients having a grain size of below 0.6 .mu.m and a chemical composition consisting essentially of 53.4 weight % Al.sub.2 O.sub.3, 42.8 weight % TiO.sub.2, 3.4 weight % kaolin and 0.4 weight % sepiolite.
In the process of preparing a refractory ceramic article which employs an aluminum titanate, the improvement which comprises employing a silicate-containing aluminum titanate of raw ingredients having a grain size of below 0.6 .mu.m and a chemical composition consisting essentially of from 50 to 60 weight % Al.sub.2 O.sub.3, 40 to 45 weight % TiO.sub.2, 2 to 5 weight % kaolinite and 0.1 to 1 weight % sepiolite.
Dependencies are inferred from the claim text.