Low expansion glass filler, method of manufacturing the same and glass frit including the same
A low expansion glass filler which minimizes reflection of laser light during hermetic sealing, a method of manufacturing the same and a glass frit including the same. The low expansion glass filler includes SiO 2 , Al 2 O 3 , B 2 O 3 and CaCO 3 , the transmittance of the low expansion glass filler being 80% or greater at a wavelength ranging from 630 to 920 nm.
1. A laser sealing glass frit, comprising:
a mixture comprising a vehicle, a glass powder, and a glass filler having a transmittance of 80% or greater at a wavelength ranging from 630 to 920 nm,
the glass filler being made from a base material composition comprising SiO 2 , Al 2 O 3 , B 2 O 3 and CaCO 3 by melting, cooling and then crushing the base material composition,
wherein the laser sealing glass frit is adapted for application between first and second glass substrates to form a seal between the first and second substrates.
2. The laser sealing glass frit of claim 1 , wherein a content of the glass filler ranges from 10 to 40 weight percent of a mixture of the glass filler with the glass powder prior to addition of the vehicle to form the laser sealing glass frit.
3. The laser sealing glass frit of claim 1 , wherein a softening temperature of the glass powder is 400° C. or below.
4. The laser sealing glass frit of claim 1 , wherein the glass powder comprises at least one selected from the group consisting of V 2 O 5 —P 2 O 5 glasses, V 2 O 5 —P 2 O 5 —TeO glasses and V 2 O 5 —P 2 O 5 —Bi 2 O 3 glasses.
5. The laser sealing glass frit of claim 1 , wherein an average particle diameter of the glass powder and the glass filler is 0.5˜2 μm and a maximum particle diameter of the glass powder and the glass filler is 6˜10 μm.
6. The laser sealing glass frit of claim 1 , wherein the base material composition comprises, by weight, SiO 2 45 to 65 parts, Al 2 O 3 10 to 25 parts, B 2 O 3 10 to 20 parts and CaCO 3 10 to 20 parts.
7. The laser sealing glass frit of claim 1 , wherein a content of the vehicle in the laser sealing glass frit ranges from 35 to 50 percent of a combined weight of the glass powder and the glass filler.
8. The laser sealing glass frit of claim 1 , wherein the vehicle comprises ethyl cellulose and butyl carbitol acetate.
9. The laser sealing glass frit of claim 1 , wherein a coefficient of thermal expansion of the base material composition is 40* 10 −7 /° C. or less.