Crystalline glass composition and adhesive material using same

Patent metadata

Field	Value
Publication number	US-9409814-B2
Application number	US-201214239844-A
Country	US
Kind code	B2
Filing date	Aug 13, 2012
Priority date	Sep 8, 2011
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

Provided is a crystallizable glass composition which exhibits a high coefficient of thermal expansion after undergoing thermal treatment, has excellent fluidity during the thermal treatment, and is less likely to deteriorate the hermeticity and adhesiveness at bonded portions and volatilize glass components even when exposed to high temperatures for a long period after the thermal treatment. A crystallizable glass composition capable of precipitating MgO-based crystals as main crystals by thermal treatment, the crystallizable glass composition containing, in terms of % by mole in glass component composition, 0.1 to 30% La 2 O 3 +Nb 2 O 5 +Y 2 O 3 +Ta 2 O 5 +Yb 2 O 3 .

First claim

The invention claimed is:

1. A crystallizable glass composition capable of precipitating MgO-based crystals as main crystals by thermal treatment, the crystallizable glass composition containing, in terms of % by mole in glass component composition, 0.1 to 30% La 2 O 3 +Nb 2 O 5 +Y 2 O 3 +Ta 2 O 5 +Yb 2 O 3 , 31% to 50% SiO 2 , 10 to 45% MgO, 5 to 40% BaO, 0 to 15% B 2 O 3 , 0 to 20% CaO, and 0 to 6% Al 2 O 3 , wherein the crystallizable glass composition is in powder form.

2. The crystallizable glass composition according to claim 1 , containing 0.1 to 30% La 2 O 3 .

3. The crystallizable glass composition according to claim 1 , containing, in terms of % by mole in component composition, 5% or less R 2 O (where R represents Li, Na or K) and 5% or less P 2 O 5 .

4. The crystallizable glass composition according to claim 1 , wherein the MgO-based crystals are 2MgO.SiO 2 , BaO.2MgO.2SiO 2 or 2MgO.B 2 O 3 .

5. The crystallizable glass composition according to claim 1 , further containing, in terms of % by mole in glass component composition, 0 to 10% SrO, 0 to 15% ZnO, 0 to 3% ZrO 2 , and 0 to 3% SnO 2 .

6. The crystallizable glass composition according to claim 1 , having, after undergoing the thermal treatment, a coefficient of thermal expansion of 95×10 −7 /° C. or above at 30 to 700° C.

7. An adhesive material in which the crystallizable glass composition according to claim 1 is used.

8. The adhesive material according to claim 7 , which is for use in bonding component elements of a fuel cell.

Assignees

• Takayama Yoshihisa
• Nippon Electric Glass Co

Inventors

• Takayama Yoshihisa

Classifications

• C03C3/068

  containing rare earths · CPC title

• C03C10/0009

  containing silica as main constituent · CPC title

• C03C3/064

  containing boron · CPC title

• C03C8/02

  Frit compositions, i.e. in a powdered or comminuted form · CPC title

• H01M8/0282

  Inorganic material · CPC title