A sintered ceramic that exhibits an average linear coefficient of thermal
expansion (25-800.degree. C.) below about 5.0.times.10.sup.-7.degree.
C..sup.-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 .mu.m. 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
.mu.m, 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 Al.sub.2 O.sub.3 -forming source having a
specific surface area in excess of 50 m.sup.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 .mu.m. 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.
_ uno sinterizar de cerámica que exhibir uno medio linear coeficiente termal extensión (25-800.degree. c.) _ debajo sobre 5.0.times.10.sup.-7.degree. _ C..sup.-1, uno total porosidad entre gama 20% sobre 30%. _ además, sinterizar de cerámica artículo exhibir uno poro tamaño distribución tal que por lo menos sobre 86% poro ser uno poro tamaño menos que sobre 2 mu.m. _ pasado, de cerámica artículo exhibir uno interconectar poro estructura con poro exhibiting uno general alargado forma, es decir, poro ser predominately oriented con su largo eje en plano tela. _ este invención también relacionar uno método para producing uno sinterizar cordierite de cerámica artículo involving primero compounding y plasticizing uno cordierite-formar inorgánico polvo hornada comprising uno platy talco tener mediano partícula tamaño menos que sobre 2 mu.m, y preferible uno talco morfología índice grande que sobre 0.75. _ hornada más lejos abarcar por lo menos 4% en peso de inorgánico polvo hornada mezcla uno dispersible Al.sub.2 O.sub.3 - forming fuente tener uno específico superficie área en exceso 50 m.sup.2 /g y uno o más componente caolín, calcinar caolín, silicona, y corindón, cada tener uno mediano partícula tamaño menos que 5 mu.m. _ plastificado polvo hornada así proporcionar ser siguiente formar en uno verde panal por protuberancia por uno panal protuberancia morir y verde panal ser encender uno temperatura y para uno tiempo suficiente convertir verde panal en uno cristalizar cordierite de cerámica artículo tener ya mencionado característica. _
