发明名称 |
LOW EXPANSION, HIGH POROSITY, HIGH STRENGTH CORDIERITE BODY AND METHOD |
摘要 |
A sintered ceramic that exhibits an average linear coefficient of thermal expansion (25-800° C.) below about 5.0x10<-7>° C.<-1>, a total porosity between the range of 20% to about 30%. Furthermore, the sintered ceramic article exhibits a pore size distribution such that at least about 86% of pores are of a pore size of less than about 2 mum. Lastly, the ceramic article exhibits an interconnected pore structure with the pores exhibiting a generally elongated shape, i.e., the pores are predominately oriented with their long axis in the plane of the webs. This invention also relates to a method for producing a sintered cordierite ceramic article involving first compounding and plasticizing a cordierite-forming inorganic powder batch comprising a platy talc having median particle of size less than about 2 mum, and preferably a talc morphology index greater than about 0.75. The batch further comprises at least 4% by weight of the inorganic powder batch mixture of a dispersible Al2O3-forming source having a specific surface area in excess of 50 m<2>/g and one or more of the components of kaolin, calcined kaolin, silica, and corundum, each having a median particle sizes less than 5 mum. The plasticized powder batch thus provided is next formed into a green honeycomb by extrusion through a honeycomb extrusion die and the green honeycomb is fired to a temperature and for a time sufficient to convert the green honeycomb into a crystallized cordierite ceramic article having the aforementioned properties. |
申请公布号 |
EP1200369(A1) |
申请公布日期 |
2002.05.02 |
申请号 |
EP20000944627 |
申请日期 |
2000.06.08 |
申请人 |
CORNING INCORPORATED |
发明人 |
BEALL, DOUGLAS, M.;MALARKEY, CHRISTOPHER, J.;MERKEL, GREGORY, A. |
分类号 |
F01N3/28;B01D53/86;B01J35/04;B01J35/10;C04B35/195;C04B38/00;(IPC1-7):C04B35/195 |
主分类号 |
F01N3/28 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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