초록 ▼

Provided are a heat-resistant glass fiber which has excellent heat resistance, which is also easy to spin and less expensive and which is suitable as an acoustic material for use in an automobile muffler, and a process for the production thereof. The heat-resistant glass fiber has a composition comp

Provided are a heat-resistant glass fiber which has excellent heat resistance, which is also easy to spin and less expensive and which is suitable as an acoustic material for use in an automobile muffler, and a process for the production thereof. The heat-resistant glass fiber has a composition comprising, substantially by weight %, 56 to 58.5% of SiO2, 12 to 17% of Al2O3, 16 to 27% of CaO, 1 to 9% of MgO, 0 to 1% of Na2O and 0 to 1% of K2O as the entirety of the fiber and containing neither B2O3 nor F2, and has a surface layer portion made of a silicic glass having an SiO2 content of at least 90% by weight. The process comprises treating the surface of the above fiber having the above composition with a mineral acid, to produce the heat-resistant glass fiber.

대표청구항 ▼

1. A heat-resistant glass fiber which has a composition consisting of, by weight %, 56 to 58.5% of SiO2, 12 to 17% of Al2O3, 16 to 27% of CaO, 1 to 9% of MgO, 0 to 1% of Na2O and 0 to 1% of K2O as the entirety of the fiber and containing neither B2O3 nor F2, and which has a surface layer portion mad

1. A heat-resistant glass fiber which has a composition consisting of, by weight %, 56 to 58.5% of SiO2, 12 to 17% of Al2O3, 16 to 27% of CaO, 1 to 9% of MgO, 0 to 1% of Na2O and 0 to 1% of K2O as the entirety of the fiber and containing neither B2O3 nor F2, and which has a surface layer portion made of a silicic glass having an SiO2 content of at least 90% by weight, wherein the fiber substantially retains its flexibility when heated for ten hours at 900° C.2. The heat-resistant glass fiber of claim 1, wherein the surface layer portion made of a silicic glass having an SiO2 content of at least 90% by weight has a thickness of 0.1 to 1.0 μm.3. The heat-resistant glass fiber of claim 1, wherein a difference ΔT between a spinning temperature which is a melting temperature of a glass having a viscosity of 100 Pa·s and a liqluidus temperature is at least 30° C.4. A process for the production of the heat-resistant glass fiber recited in claim 1, which comprises treating the surface of a glass fiber which has a composition comprising, by weight %, 56 to 58.5% of SiO2, 12 to 17% of Al2O3, 16 to 27% of CaO, 1% to 9% MgO, 0 to 1% of Na2O and 0 to 1% of K2O and containing neither B2O3 nor F2, with a mineral acid.5. The process of claim 4, wherein the treatment is carried out by immersing the glass fiber in an aqueous solution containing, as the mineral acid, 1 to 10% by weight of at least one acid selected from HCl, H2SO4 or HNO3 at a temperature of 0 to 90° C.6. A heat-resistant glass fiber which has a surface layer portion at least 0.01 μm thick, made of silicic glass having an SiO2 content of at least 90%, the balance of the glass fiber having a composition consisting of, by weight %, 56 to 58.5% of SiO2, 12 to 17% of Al2O3, 16 to 27% of CaO, 1 to 9% of MgO, 0 to 1% of Na2O and 0 to 1% of K2O as the entirety of the fiber and containing neither B2O3 nor F2, wherein the fiber substantially retains its flexibility when heated for ten hours at 90 ° C.