Ceramic body based on aluminum titanate and including a glass phase
AssigneeCorning Incorporated
InventorsSteven B. Ogunwumi, Patrick D. Tepesch
Life of this patent
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Abstract
A ceramic body comprising a crystal phase of aluminum titanate in an amount of 50 to 95% by weight, and a glass phase in an amount of 5 to 50% by weight. The inventive ceramic body may include a second crystal phase, for example mullite in an amount of up to 40% by weight. The glass is an aluminosilicate including, in weight percent on an oxide basis, of 50–90 SiO2, 1–25 Al2O3, 0.5–10 TiO2, 0.5–20 R2O, where R is selected from the group consisting of Li, Na, K, Ru, Cs, Fr, and 0.5–20 R′O, where R′ is selected from the group consisting of Be, Mg, Ca, Ba, Ra, and wherein the ceramic body includes not more than 2% by weight Fe2O3.
Claims12
A ceramic body comprising a crystal phase of aluminum titanate in an amount of 50 to 95% by weight, and a glass phase in an amount of 5 to 50% by weight, the glass being an aluminosilicate and having a composition consisting essentially, in weight percent on an oxide basis, of 50–90 SiO2, 1–25 Al2O3, 0.5–10 TiO2, 0.5–20 R2O, where R is selected from the group consisting of Li, Na, K, Ru, Cs, Fr, and 0.5–20 R′O, where R′ is selected from the group consisting of Be, Mg, Ca, Ba, Ra, wherein the ceramic body includes not more than 2% by weight Fe2O3.
A method of making an aluminum titanate-based ceramic body comprising:
- a. formulating a batch of raw materials including sources of silica, alumina, titania, alkali metals, alkaline earth metals, and optionally a pore former;
- b. mixing the batch with organic processing aids including lubricants, binders, plasticizers, and the like, and water as solvent to form a homogeneous and plasticized mixture;
- c. shaping the homogeneous and plasticized mixture into a green body;
- d. optionally drying the green body, and then heating to a temperature and for a period of time to develop a body having a crystal phase of aluminum titanate in an amount of 50 to 95% by weight, which optionally includes up to 40% by weight mullite as a second crystal phase, and a glass phase in an amount of 5 to 50% by weight, the glass being an aluminosilicate and having a composition consisting essentially, in weight percent on an oxide basis, of 50–90 SiO2, 1–25 Al2O3, 0.5–10 TiO2, 0.5–20 R2O, where R is selected from the group consisting of Li, Na, K, Ru, Cs, Fr, and 0.5–20 R′O, where R′ is selected from the group consisting of Be, Mg, Ca, Ba, Ra, wherein the ceramic body includes not more than 2% by weight Fe2O3.
Dependencies are inferred from the claim text.