Low melting glass, sealing composition and sealing paste

A technology of low melting point glass and sealing composition, applied in the field of sealing composition and sealing paste, and low melting point glass, can solve the problems of low sealing strength, increased bubbles, inability to seal bismuth glass, etc., and achieve the effect of inhibiting corrosion and stable operation

Inactive Publication Date: 2012-06-20
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] But bismuth glasses developed so far cannot be hermetically sealed at temperatures lower than pre-fired, especially when producing flat panel displays such as PDPs.
Even if it can be sealed, glass that can seal well has not been found due to low sealing strength or increased air bubbles remaining after sealing

Method used

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  • Low melting glass, sealing composition and sealing paste
  • Low melting glass, sealing composition and sealing paste
  • Low melting glass, sealing composition and sealing paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0064] As shown in Table 1, the raw material was prepared with 80.6% Bi 2 o 3 , 7.2% B 2 o 3 , 11.2% ZnO, 0.4% CeO 2 , 0.2% Al 2 o 3 , 0.1% Fe 2 o 3 and 0.3% of CuO were mixed to prepare a batch. The ingredients were placed in platinum crucibles, which were then melted in a furnace adjusted to 1100°C for 50 minutes. The molten glass was formed into a flake shape with a water-cooled drum, pulverized with a ball mill, and passed through a 150-mesh screen to obtain a low-melting glass.

[0065] Al of the low-melting glass 2 o 3 / Bi 2 o 3 Molar ratio is 0.46 / 40.92, namely 0.011, (Fe 2 o 3 +CuO) / Bi 2 o 3 The molar ratio of is (0.15+0.89) / 40.92, which is 0.025.

[0066] A sealing composition was prepared by adding 26 vol % cordierite and 2 vol % zirconium phosphate as a refractory ceramic filler to 72 vol % low melting point glass. The glass transition point, load softening point, and softening point of the sealing composition were measured with a differential ther...

Embodiment 1-2 to 1-6

[0077] Examples 1-2 to 1-6 Sealing compositions were prepared in the same manner as in Example 1-1.

[0078] The method of Example 1-1 was repeated for melting the glass, except that the raw materials were blended as shown in Table 1 to prepare the batch. The molten glass was formed into flakes with a water-cooled drum, pulverized with a ball mill, and passed through a 150-mesh screen to obtain low-melting glass.

[0079] Al of the above-mentioned low melting point glass 2 o 3 / Bi 2 o 3 The molar ratio is 0.022-0.076, (CuO+Fe 2 o 3 ) / Bi 2 o 3 The molar ratio is 0.011-0.036. When the sealing composition mixed with the low-melting glass and the refractory ceramic filler was fired at a pre-firing temperature of 480-540°C, no crystal deposition was observed in any of the glasses. Also, since the low-melting glass has a load softening point of 356-379°C, even a sealing composition obtained by mixing with a refractory ceramic filler can sufficiently flow at a temperature of...

Embodiment 2-1

[0099] As shown in Table 2, the feedstock was prepared with 82.46% Bi 2 o 3 , 5.68% B 2 o 3 , 10.67% ZnO, 0.15% SiO 2 , 0.2% CeO 2 , 0.64% Al 2 o 3 , 0.10% Fe 2 o 3 and 0.10% of CuO were mixed to prepare the batch. The ingredients were placed in platinum crucibles, which were then melted in a furnace adjusted to 1100°C for 50 minutes. In addition, the molten glass was shaped into flakes with a water-cooled drum, pulverized with a ball mill, and passed through a 150-mesh screen to obtain a low-melting glass.

[0100] Al of the low-melting glass 2 o 3 / Bi 2 o 3 The molar ratio was set to 0.035, (Fe 2 o 3 +CuO) / Bi 2 o 3 The molar ratio was set to 0.011, B 2 o 3 The molar ratio of / ZnO was set to 0.62.

[0101] The sealing composition was prepared by adding 23 volume percent cordierite as a refractory ceramic filler to 77 volume percent low melting glass. The specific surface area of ​​the cordierite is 3m 2 / g or less. The glass transition point, load softe...

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Abstract

A low melting glass, which contains substantially no lead and contains 70-90% of Bi2O3, 1-20% of ZnO, 2-12% of B2O3, 0.1-5% of Al2O3, 0.1-5% of CeO2, 0-5% of CuO, 0-0.2% of Fe2O3 and 0.05-5% of CuO+Fe2O3 in mass %, wherein a content of alkali metal oxides in the glass composition is less than 0.1%, and the glass does not crystallize by pre-baking at a sealing temperature or more, can be used for sealing later, and can suppress deterioration of a material such as platinum or platinum-rhodium to provide a stable melting operation for a long period.

Description

[0001] Cross References to Related Applications [0002] This application is based on the prior Japanese patent application 2004-328729 filed on November 12, 2004, the prior Japanese patent application 2005-183616 filed on June 23, 2005, and the prior Japanese patent application filed on September 29, 2005 Application 2005-283566, and claims the benefit of priority from these applications; the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a low melting point glass, a sealing composition and a sealing paste, and more particularly, the present invention relates to a low melting point glass substantially free of lead components and used for the production of flat panel displays such as plasma display panels (hereinafter referred to as PDPs) , sealing compositions and sealing pastes. Background technique [0004] In general, the sealing composition used to seal the periphery of the PDP is usually made of...

Claims

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Application Information

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IPC IPC(8): C03C8/24
Inventor 井出旭
Owner ASAHI GLASS CO LTD
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