摘要:
Silicon-aluminum mixed oxide powder which is flamehydrolytically produced and has a composition of 65 to 85% by weight Al.sub.2 O.sub.3, remainder SiO.sub.2 and an amorphous structure, in which each primary particle contains components of SiO.sub.2 and of Al.sub.2 O.sub.3, the primary particles are between 7 and 80 nm, preferably 10 and 40 nm in size and the specific surface of the powder is between 20 and 200 m.sup.2 /g. The powder is used for the production of mullite and sintered compacts manufactured from it.
摘要翻译:硅铝混合氧化物粉末,它是以水解方式制备的,其组成为65至85重量%的Al 2 O 3,余量为SiO 2和无定形结构,其中,每个一次粒子含有SiO 2和Al 2 O 3的成分,初级粒子在7〜 80nm,优选10和40nm,粉末的比表面积为20-200m2 / g。 该粉末用于生产由其制造的莫来石和烧结体。
摘要:
Silicon-aluminum mixed oxide powder which is flame-hydrolytically produced and has a composition of 65 to 85% by weight Al.sub.2 O.sub.3, remainder SiO.sub.2 and an amorphous structure, in which each primary particle contains components of SiO.sub.2 and of Al.sub.2 O.sub.3, the primary particles are between 7 and 80 nm, preferably 10 and 40 nm in size and the specific surface of the powder is between 20 and 200 m.sup.2 /g. The powder is used for the production of mullite and sintered compacts manufactured from it.
摘要翻译:硅 - 铝混合氧化物粉末,其被火焰水解制备,并且组成为65至85重量%的Al 2 O 3,剩余SiO 2和无定形结构,其中每个一次粒子包含SiO 2和Al 2 O 3的成分,一次颗粒介于 7和80nm,优选10和40nm,粉末的比表面积在20和200m 2 / g之间。 该粉末用于生产由其制造的莫来石和烧结体。
摘要:
Pyrogenically, especially flame-hydrolytically produced zirconium dioxide powder with a specific surface area between 20 and 200 m2/g, a primary particle size between 7 and 100 nm, a tamped density of the deacidified and non-deacidified zirconium dioxide between 40 and 150 g/l with Sears numbers of the deacidified and non-deacidified zirconium dioxide between 1 and 20 ml/2 g and with a chlorine content of the deacidified zirconium dioxide less than 0.6% by weight. These are produced by evaporating zirconium halides, mixing the vapors alone or together with a carrier gas in a burner with air, oxygen, nitrogen and hydrogen, causing the gases to react with each other in a flame in a closed burner chamber, cooling off the waste gases and the zirconium dioxide in a heat exchanger unit, separating the waste gases from the zirconium dioxide and removing any halide remnants adhering to the zirconium dioxide by a heat treatment with moistened air.
摘要:
A boron oxide-silicon dioxide mixed oxide which has a BET surface of less than 100 m.sup.2 g, and optionally containing oxides of aluminium, titanium or zirconium, is prepared pyrogenically by flame hydrolysis. The mixed oxide is used in glass making.
摘要:
Pyrogenically produced silica having a specific surface of less than 90 m.sup.2 /g, preferably of less than 60 m.sup.2 /g, and a DBP absorption of less than 60 wt. % (less or equal to 57.30 ml dibutyl phthalate/100 g) is produced by vaporizing silicon halides and/or organosilicon halides, mixing the vapors with a carrier gas, heating the mixture to temperatures definitely above the boiling point of the silicon-halogen compound, mixing with hydrogen and combustion in a known manner in a burner.
摘要:
A boron oxide-silicon dioxide mixed oxide which has a BET surface of less than 100 m2g, and optionally containing oxides of aluminium, titanium or zirconium, is prepared pyrogenically by flame hydrolysis. The mixed oxide is used in glass making.
摘要:
Flame-hydrolytically produced titanium dioxide mixed oxide having a BET surface of 10 to 150 m.sup.2 /g and 1 to 30% by weight aluminum oxide or 1 to 30% by weight silicon dioxide is produced by evaporating aluminum chloride or silicon tetrachloride, transferring the evaporated aluminum chloride or silicon tetrachloride, together with an inert gas, into the mixing chamber of a burner, mixing them with hydrogen, air and gaseous titanium tetrachloride, burning the resulting 4-component mixture in the reaction chamber of the burner, and separating the titanium dioxide mixed oxide from the gaseous reaction products.
摘要:
Flame-hydrolytically produced titanium dioxide mixed oxide having a BET surface of 10 to 150 m.sup.2 /g and 1 to 30% by weight aluminum oxide or 1 to 30% by weight silicon dioxide is produced by evaporating aluminum chloride or silicon tetrachloride, transferring the evaporated aluminum chloride or silicon tetrachloride, together with an inert gas, into the mixing chamber of a burner, mixing them with hydrogen, air and gaseous titanium tetrachloride, burning the resulting 4-component mixture in the reaction chamber of the burner, and separating the titanium dioxide mixed oxide from the gaseous reaction products.
摘要:
Flame-hydrolytically produced titanium dioxide mixed oxide having a BET surface of 10 to 150 m.sup.2 /g and 1 to 30% by weight aluminum oxide or 1 to 30% by weight silicon dioxide is produced by evaporating aluminum chloride or silicon tetrachloride, transferring the evaporated aluminum chloride or silicon tetrachloride, together with an inert gas, into the mixing chamber of a burner, mixing them with hydrogen, air and gaseous titanium tetrachloride, burning the resulting 4-component mixture in the reaction chamber of the burner, and separating the titanium dioxide mixed oxide from the gaseous reaction products.
摘要:
Surface-modified, doped, pyrogenically produced oxides surface-modified with one or several compounds from the following groups: a) Organosilanes of the type (RO)3Si(CnH2n+1), (RO)3Si(CnH2n−1) b) R′x(RO)ySi(CnH2n+1), (RO)3Si(CnH2n+1) c) X3Si(CnH2n+1), X3Si(CnH2n−1) d) X2(R′)Si(CnH2n+1), X2(R′)Si(CnH2n−1) e) X(R′)2Si(CnH2n+1), X(R′)2Si(CnH2n−1) f) (RO)3Si(CH2)m—R′, g) (R″)x(RO)ySi(CH2)m—R′, h) X3Si(CH2)m—R′, i) (R)X2Si(CH2)m—R′, j) (R)2XSi(CH2)m—R′, k) Silazanes of the type l) Cyclic polysiloxanes, m) Polysiloxanes or silicone oils.
摘要翻译:表面改性,掺杂,热解产生的氧化物用一种或几种来自以下组的化合物进行表面改性:a)类型(RO)3 Si(C n) H 2 n + 1),(RO)3 Si(C n H 2n-1)b)R (RO)y y y y y>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 3 Si(C n H 2n + 1)c)X 3 Si(C n H n) H 2n + 1),X 3 Si(C n H 2n-1)d)X -R',j)(R)2 XSi(CH 2)m -R a,k)1)的硅氮烷, C 聚硅氧烷,m)聚硅氧烷或硅油。