Negative thermal expansion glass ceramic and method for producing the same
First Claim
1. A negative thermal expansion glass ceramic produced by subjecting a base glass to a heat treatment,wherein the base glass comprises, in mass percent, the following components:
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Abstract
A negative thermal expansion glass ceramic having a negative coefficient of thermal expansion, which is a sufficiently large absolute value in a temperature range of −40° C. to +160° C. and a method for producing the same are provided. The negative thermal expansion glass ceramic has a coefficient of thermal expansion of −25 to −100×10−7/° C. in the temperature range of −40° C. to +160° C., and comprises main crystalline phases which are one or more types selected from a group consisting of β-eucryptite solid solution (β-Li2O.Al2O3.2SiO2 solid solution), β-eucryptite (β-Li2O.Al2O3.2SiO2), β-quartz solid solution (β-SiO2 solid solution), and β-quartz (β-SiO2), wherein a total amount of crystals of the main crystalline phases can be 70 to 100% in mass percent.
33 Citations
10 Claims
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1. A negative thermal expansion glass ceramic produced by subjecting a base glass to a heat treatment,
wherein the base glass comprises, in mass percent, the following components:
-
6. A method for producing a negative thermal expansion glass ceramic, comprising the steps of:
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melting a base glass;
quenching the molten base glass;
reducing the quenched base glass to a powder;
forming the powder into a product; and
firing the formed product at a temperature range of 1200°
C. to 1350°
C. to crystallize the product, the product having a coefficient of thermal expansion of from −
25 to −
100×
10−
7/°
C. in the temperature range of from −
40°
C. to =160°
C.;
wherein the base glass comprises, in mass percent, the following components;
-
-
7. A method for producing a negative thermal expansion glass ceramic, comprising the steps of:
-
melting a base glass to form a molten base glass;
forming the molten base glass into a product;
heat treating the formed product at a temperature range of 620°
C. to 800°
C. to nucleate the product; and
heat treating the resulting product at a temperature range of 700°
C. to 950°
C. to crystallize the product, the product having a coefficient of thermal expansion of from −
25 to −
100×
10−
7/°
C. in the temperature range of from −
40°
C. to =160°
C.;
wherein the base glass comprises, in mass percent, the following components;
- View Dependent Claims (9)
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Specification