Glass fiber and composition for glass fibers
AssigneeNippon Sheet Glass Co., Ltd.
InventorAya NAKAMURA
Life of this patent
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Abstract
The present disclosure provides a glass fiber having a fiber diameter of 18 μm or less and including a glass composition. A MgO content in the glass composition is 15 mol % or more, and a common logarithm log η of a viscosity η [dPa·s] of the glass composition at a devitrification temperature is 2.6 or more. The present disclosure also provides a glass composition which includes, in mol %: SiO2 50 to 65%; Al2O3 5 to 26%; B2O3 0 to 1.6%; MgO 15 to 30%; CaO 0 to 8%; Li2O 0 to 2.4%; and Na2O more than 0.2% and 2.85% or less and in which a sum of a Li2O content, a Na2O content, a K2O content is 0.3 to 3.0%, and a ratio of the Na2O content to this sum is 0.2 or more and 0.95 or less.
Claims22
1-36. (canceled)
A glass composition for glass fibers, the glass composition comprising, in mol %:
- SiO2 50 to 65%;
- Al2O3 5 to 26%;
- B2O3 0 to 1.6%;
- MgO 20 to 30%;
- CaO 0 to 6%;
- Li2O 0.1 to 0.8%;
- and
- Na2O more than 0.2% and 2.85% or less, wherein
- a sum of a Li2O content, a Na2O content, and a K2O content is 0.5 to 3.0%,
- a Na2O ratio defined by a ratio of the Na2O content to the sum of the Li2O content, the Na2O content, and the K2O content is 0.2 or more and 0.95 or less, and
- a sum of an Y2O3 content and a La2O3 content in the glass composition is 0 to 0.5%.
A glass composition for glass fibers, comprising, in mol %:
- SiO2 50 to 65%;
- Al2O3 5 to 26%;
- B2O3 0 to 1.6%;
- MgO 20 to 30%;
- CaO 0 to 6%;
- Li2O 0.1 to 0.8%;
- and
- Na2O more than 0.2% and less than 3%, wherein
- a common logarithm log η of a viscosity η [dPa·s] at a devitrification temperature is 2.6 or more, and the Young's modulus is 99 GPa or more.
A glass particle comprising a glass composition, the glass composition comprising, in mol %:
- SiO2 50 to 65%;
- Al2O3 5 to 26%;
- B2O3 0 to 1.6%;
- MgO 20 to 30%;
- CaO 0 to 6%;
- Li2O 0.1 to 0.8%;
- and
- Na2O more than 0.2% and 2.85% or less, wherein
- a sum of a Li2O content, a Na2O content, and a K2O content is 0.5 to 3.0%,
- a Na2O ratio defined by a ratio of the Na2O content to the sum of the Li2O content, the Na2O content, and the K2O content is 0.2 or more and 0.95 or less, and
- a sum of an Y2O3 content and a La2O3 content is 0 to 0.5% in mol %.
A glass particle comprising a glass composition, the glass composition comprising, in mol %:
- SiO2 50 to 65%;
- Al2O3 5 to 26%;
- B2O3 0 to 1.6%;
- MgO 20 to 30%;
- CaO 0 to 6%;
- Li2O 0.1 to 0.8%;
- and
- Na2O more than 0.2% and less than 3%, wherein
- a common logarithm log η of a viscosity η [dPa·s] at a devitrification temperature is 2.6 or more, and the Young's modulus is 99 GPa or more.
Dependencies are inferred from the claim text.