| 主权项 |
1. A method for producing a doped low thermal expansion lithia alumina silica material, comprising:
mixing a source of silica comprising an orthosilicate with an alcohol and a water to produce a first mixture comprising a first volumetric ratio of about 0.5 to about 1.5 parts of the orthosilicate to about 1.0 parts of the alcohol, and a second volumetric ratio of about 0.1 to about 1.0 parts of the water to about 1.0 part of the orthosilicate; adjusting the pH of the first mixture to between about 0.5 and about 4.0 by addition of an acid to produce a pH adjusted mixture; modifying the pH adjusted mixture by adding a source of alumina comprising an aluminum salt, adding a source of lithia comprising a lithium salt, and adding a metal salt, wherein the metal salt comprises a metal and a counter-ion, to produce a suspension comprising an elemental ratio of about 1 part of aluminum to about 1 part silicon to about 1 part lithium, and a metal concentration in the range of about 0.01 mole % to about 10 mole % of the metal, wherein the metal concentration is relative to the total amounts of the lithium in the suspension; and processing the suspension to produce the doped low thermal expansion lithia alumina silica material. |
