SU910541A1 - Soldering glass - Google Patents

Description

(, S) GLASS FOR SOLDING

  . Classification refers to the composition of glasses for soldering parts of different materials in the manufacture of vacuum tubes. Known solder. glass including PbO, ZnO, in the following quantities, weight: ZnO, 5; BiO H, 5-16,0; 3,3-, 0, РЬО the rest ts13. . These glass has a CTE degree and soldering temperature of 505-520 ° C. The closest in technical essence and the achieved result to the proposed is low-melting glass of the following composition, wt.%: PHO 61 -86; Br-15; ZnO -, () 0.1-2; Aljpa O, CuO 0.5-2.5; Bijpj I-Glass is cooked at VET-P50 C for 3 hours. I The disadvantages of these glasses include low heat resistance and poor electrical insulating properties. The purpose of the invention is to increase the heat resistance and improve the electrical insulation properties of glass. This is achieved by those. that known glass, including: PbO, B, ZnO,,, additionally contains CdO and TyO2: With the following ratio of ingredients, wt.%: Specific compositions are given in Table. one

Synthesis of glass for soldering is carried out at temperatures of 115012.5 ° C. The resulting steel is subsequently crushed to a grain size of 0.3-0.5 mm. When soldering metal (in particular, molybdenum) and ceramics (high-alumina ceramics), glass chips are placed in the gap between the junctions

The synthesis temperature of glass, la, C

KTV in the range of 20-300 s,

hail

Dilatometric softening temperature, C

The temperature of the beginning of the spread,

Soldering temperature, С

T a fi face 1

your materials and put in

an electric furnace at temperatures of 600–650 ° C, depending on the specific composition, and held for 10-15 minutes.

I

Properties of synthesized glass

are presented in table. 2

table 2

1250

1150 58.0 68.0 20

385

600

550 600

Claims (2)

650 cc,% Specific, resistivity Ohm.m at 10.5–10–3.5–10 C at breakdown voltage at, kV / mm Heat resistance, cycles The presented glass for soldering is intended for soldering metals (molybdenum, covar) with high-alumina ceramics or electro porcelain in the manufacture of devices in the radio and electronics industry (in particular, the cathode assemblies of the electron microscope) —the replacement of the current silver alloy based on jflo. Glass can also be used for soldering metal to metal in parts of medium-sized instrumentation. The glass for soldering is distinguished by high heat resistance and electrical properties at elevated temperatures, greatly expanding the possibilities of its use in the industry. Claims Glass for soldering, including PHO, B2.0J, ZnO, A12.0e,, Continued table. 2 4 p. ЗЮ7 .8-10, 8-1о 4.2-10-10, characterized in that it additionally contains CdO and TeOa in order to increase the heat resistance and improve the electrical insulation properties. in the following ratio of ingredients, mass:. . Sources of information taken into account during the examination 1. USSR author's certificate No. 611893, cl. From 03 to 3/12, 1976. 2. USSR author's certificate №, cl. From 03 To 3/10, 1976.