Sintered ceramic materials based on aluminium titanate, a process for their production and their use
First Claim
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1. Sintered ceramic body which comprise doped aluminum titanate and mullite having the composition:
- 50-61.5% by weight Al2 O3,36-47.5% by weight titanium oxide, expressed as TiO2,2.5-5% by weight SiO2,with the sum total of the three components adding up to 100%, and which further comprise 0.3 to 1% by weight MgO, 0.015 to 0.5% by weight iron oxide, expressed as Fe2 O3 and up to 1% by weight impurities.
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Abstract
Sintered ceramic material which comprises doped aluminum titanate and mullite having the composition:
50-61.5% by weight Al2 O3,
36-47.5% by weight titanium oxide, expressed as TiO2,
2.5-5% by weight SiO2,
with the sum total of the three components adding up to 100%, and which further comprises 0.3 to 1% by weight MgO and up to 1% by weight impurities, useful as, inter alia, filters, catalyst supports and internal combustion engine parts, are prepared by mixing and shaping materials of suitable composition and then sintering the shaped composition at temperatures of 1250° to 1600° C. over a holding time of 0.5 to 100 hours.
48 Citations
15 Claims
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1. Sintered ceramic body which comprise doped aluminum titanate and mullite having the composition:
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50-61.5% by weight Al2 O3, 36-47.5% by weight titanium oxide, expressed as TiO2, 2.5-5% by weight SiO2, with the sum total of the three components adding up to 100%, and which further comprise 0.3 to 1% by weight MgO, 0.015 to 0.5% by weight iron oxide, expressed as Fe2 O3 and up to 1% by weight impurities. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A process for the production of sintered ceramic body which comprises the steps of mixing, shaping and sintering a composition comprising the following components:
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50-61.5% by weight Al2 O3, 36-47.5% by weight titanium oxide, expressed as TiO2, 2.5-5% by weight SiO2, with the sum total of the three components adding up to 100%, and which further comprise 0.3 to 1% by weight MgO, 0.015 to 0.5% by weight iron oxide, expressed as Fe2 O3 and up to 1% by weight impurities wherein the sintering of the ceramic body at temperatures of 1250°
to 1600°
C. over a holding time of 0.5 to 100 hours. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification