Bodies composed of at least two parts, sealing glass and method for bonding parts

• US 4,330,596 A
• Filed: 11/24/1980
• Issued: 05/18/1982
• Est. Priority Date: 11/22/1979
• Status: Expired due to Term

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Van Assche, Paul J.
• Primary Examiner(s): BELL, MARK LEE
• Application Number:
  US06/209,794
• Time in Patent Office: 540 Days
• Field of Search: 501/49, 501/52, 501/79, 428/428, 428/432
• US Class Current: 428/428
• CPC Class Codes: C03C 27/06 Joining glass to glass by processes other than fusing fusing C03B23/20; units for use as elements for closing wall or like openings and comprising two or more parallel glass panes in spaced relationship, the panes being permanently secured together E06B3/66
• CPC Class Codes: C03C 8/24 Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders
• CPC Class Codes: C04B 2237/10 Glass interlayers, e.g. frit or flux
• CPC Class Codes: C04B 2237/32 Ceramic
• CPC Class Codes: C04B 2237/76 Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc
• CPC Class Codes: C04B 37/005 consisting of glass or ceramic material

Abstract

In practice no sealing glasses are known with which glass or ceramic material having a coefficient of thermal expansion α₃₀°-300° C. in the range between 31 to 36×10^-7 per °C. can be sealed together.

The invention provides bodies which are composed of at least two parts, these parts having been made from a material having a coefficient of expansion as mentioned above, the parts having been sealed together by means of a sealing glass containing 8-10 weight % vanadium pentoxide, 1.5-3.0 weight % copper (II) oxide, 1-3 weight % lead (II) oxide, 0-1 weight % silicon oxide, 0-5 weight % aluminium oxide, 26-28 weight % boron oxide and 58-61 weight % zinc oxide. The weight ratio of boron oxide to zinc oxide is in the range from 0.45 to 0.47.

The body is composed of parts (1 and 3), which have been sealed together by means of the sealing glass (2).

Claims

1. Bodies composed of at least two parts produced of a glass or a ceramic material having a coefficient of thermal expansion α

₃₀°

-300°

C. in the range 31 to 36×

10^-7 per °

C., these parts having been sealed together by means of a sealing glass having a coefficient of expansion of less than 40×

10^-7 per °

C. characterized in that the sealing glass consists essentially of 8-10 weight % vanadium pentoxide, 1.5-3.0 weight % copper (II) oxide, 1-3 weight % lead (II) oxide, 0-1 weight % silicon (IV) oxide, 0-5 weight % aluminium oxide, 26-28 weight % boron (III) oxide and 58-61 weight % zinc oxide, the weight ratio boron oxide to zinc oxide being from 0.45 to 0.47.

2. A body is claimed in claim 1, characterized in that the sealing glass contains 9.0 weight % vanadium-pentoxide, 27.2 weight % boron oxide, 59.3 weight % zinc oxide, 2.3 weight % copper oxide, 1.8 weight % lead oxide and 0.4 weight % silicon oxide.

3. A sealing glass having a coefficient of expansion of less than 40×

10^-7 per °

C. characterized in that the sealing glass consists essentially of 8-10 weight % vanadium pentoxide, 1.5-3.0 weight % copper (II) oxide, 1-3 weight % lead (II) oxide, 0-1 weight % silicon oxide, 0-5 weight % aluminium oxide, 26-28 weight % boron oxide, and 58-61 weight % zinc oxide, the weight ratio boron oxide to zinc oxide being from 0.45 to 0.47.

4. A sealing glass as claimed in claim 3, characterized in that the sealing glass contains 9.0 weight % vanadium pentoxide, 27.2 weight % boron oxide, 59.3 weight % zinc oxide, 2.3 weight % copper oxide, 1.8 weight % lead oxide and 0.4 weight % silicon oxide.