Beta-spodumene ceramics for high temperature applications

Details Beta-spodumene ceramics for high temperature applications Beta-spodumene ceramics for high temperature applications

2005-08-23

2005-08-23

Sample, David (Department: 1755)

Compositions: ceramic

Ceramic compositions

Refractory

C501S120000, C501S122000, C501S153000, C501S154000

Reexamination Certificate

active

06933255

ABSTRACT:
A method of preparing beta-spodumene bodies from a plastic batch comprised entirely of minerals, absent a glass component. The resulting structure has a stoichiometry of 1:1:4 (Li2O:Al2O3:SiO2) to 1:1:11 (Li2O:Al2O3:SiO2), and exhibits a low coefficient of thermal expansion, high porosity and high strength, and is suitable for automotive catalytic converter substrates requiring a fast light-off time. There is also provided a ceramic article having a solid-solution of beta-spodumene ranging in molar ratio from 1:1:4 Li2O—Al2O3—SiO2to 1:1:11 LiO2—Al2O3—SiO2wherein a component selected from the group consisting of magnesium oxide (MgO), manganese oxide (MnO), and cobalt oxide (CoO) is substituted for lithium oxide (LiO2) at 10 to 65 mole %, and optionally a minor phase of mullite (3Al2O3-2SiO2) in an amount of up to 50% by weight.

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