Lead-free glass material for use in sealing and, sealed article and method for sealing using the same

Abstract

Provided with a glass composition including a network-former oxide composed of any one of or both of B 2 O 3 and V 2 O 5 of 20-80% by weight, ZnO of 0-60% by weight and BaO of 0-80% by weight, wherein at least one of ZnO and BaO is included as an essential ingredient. The present invention is a glass material for use in sealing, which is of lead-free series, can be used for sealing at a low processing temperature and within a wide temperature range, has a low thermal expansion coefficient, superior adhesion, superior sealing processability, superior adherence, superior chemical stability, superior strength and the like and comprises sufficient practical performance to substitute for lead glass.

1 - 13 . (canceled)  
   
   
       14 . A sealing method, wherein a sealed portion of an article to be sealed is coated with a lead-free glass material for use in sealing composed of mixed powder paste, said mixed powder paste including a refractory filler added to a glass powder, said glass powder having a glass composition including a network-former oxide composed of any one of or both of B 2 O 3  and V 2 O 5  of 20-80% by weight, ZnO of 0-60% by weight and BaO of 0-80% by weight, wherein at least one of ZnO and BaO is included as an essential ingredient, tentative burning is performed for the article at around a softening point of a lead-free glass included in the paste and then main burning is performed at around a crystallization starting temperature of the lead-free glass.  
   
   
       15 . The sealing method according to  claim 14 , wherein the tentative burning is performed within a temperature range between the softening point minus 10° C. and the softening point plus 40° C. and the main burning is performed within a temperature range between the crystallization starting temperature minus 20° C. and the crystallization starting temperature plus 50° C.