SU863518A1 - Glass for soldering with covar - Google Patents

Description

(54) GLASS FOR SPACING WITH CARPET

The invention relates to crystal and zukhtsikhs compositions of borosilicate glasses soldered to covar, and can be widely used in the sake of amphibious and other technical fields and, in particular, for insulating body leads for | (integrated circuits. Glass is known for glassy glass material used for soldering with covar, containing, wt%: PiOa55-65j AljOa 10-15 LijO 10-15 | Kor-5j 2-3 5-2.0 ZnO 1-10j ZrOi 0,2- 1; 0.5-4; Has the ability not to leak onto the contact pads of the leads during the process of soldering {1} 7 However, rather good physical and chemical properties of the material (chemical resistance III, hydrolytic class, specific resistance 1.5–10 ohm-cm), to obtain a mattress-glassy-crisscale spa of the billet of the body. complicates the process, since the fusing temperature of the material is 990 ° C. The sintered borosilicate glass, containing wt.%, is the closest to the invention in terms of its technical essence and results: SiOa 60-62; 22-25jNajO 810; AlftO 3.5-5.0 0-1.5; CaO 0-25; MgO 0-1, BaO 0-3; Li2O 0-1; ZnO 0-2, for evaporation of cov inputs with TCLE 60-70-10-deg-C. The glass has a thermal expansion coefficient of 71-10 ° C and 20-400 ° C and a softening temperature of 515-520 ° C. 2. This drain, used for soldering with artisans, also has a low specific resistivity value of 350 cm, low mechanical strength. (tensile strength at centrifugally-symmetrical bending of 7.0-7.3 kgf / mm), has a V hydrolytic class in chemical stability, which adversely affects both the naming process and the performance characteristics. The purpose of the invention is to increase the mechanical strength and resistivity. The goal is achieved by the fact that glass contains components in the following ratio, wt.% SiO, 62-69.0; 12-18.0; A1aOe 2-4.0 / CaO 2.18, 4 / iyigO 1.5-6.0; 3.0-5.0, KQ.O 3.0-5.0; moreover, the ratio of 1 taO / MgO is found in the range of 1.381, 40. Specific examples of stack compositions for soldering with covars in air I environment at a temperature corresponding to a glass viscosity of 10 P are given in Table. 1. For the synthesis of glasses, the following technical raw materials are used; quartz sand, boric acid, alumina, potash, soda ash, chalk, dolomite. The indicated glass compositions are varied in gas-flame furnaces at 1500–1550 ° C. Table 2 shows some of the physicochemical properties of the glasses offered. From the given data. 2 it can be seen that the mechanical strength of the specific resistivity and the consistency of the material with the thermal expansion coefficient of the covara-treated glass exceeds known, 56, 5

62.0 17.2 18.0 3.8 2.0 1/5 5.0 2.1 7.0 3.4 3.0 3.5 3.0

. lO, in the temperature range

20-300 ° C62.0

20-500 C64,0

Temperature at which the viscosity of the glass is 10 P, ° C

   Ohm-cm at V 100 V

Chemical resistance according to GOST

0.08 10134-62 to HjiO

Table

69.0

62.3

5.5 12.0

12.3

5.0 4.0

2.3

3.0 2.1

6.0

3.5 2.9 8.4

5.0 5.0 4.2

4.0 5.0 4.5 4.0

Table 2

64.0

62.0

63.0 66.0 65.0 65.0

800

820

850

1.0

2.0

1.5

0.12

0.11

0.1

0.09 glasses, soldering with covar in air at a temperature corresponding to the viscosity of the glass 10 P, and no more. The bases of cases of integrated circuits, obtained by the method of powder technology of soldering glass with metal, are subjected to tests for tightness, insulation resistance, resistance to electroplating of nickel plating and gilding. The test results are as follows: indicator of tightness, based on the rate of leakage of gels of 1-10 l μm / s insulation resistance between the lead and the metal part of the base before nickel plating and. gilding 2.0-10 ohms, after elution and gilding 2.0-10-10 gmG. The proposed crystallizing borosilicate glass is capable of forming junction directly with metal fittings made of covar in air at temperatures below, which significantly improves the performance of the spa, and its technological properties.

Hydrolytic

the class

Limit of durability at central-7 symmetric-bend, kgf / mm

TCLE - linear expansion temperature coefficient,

. # Ru - resistivity.

Claims (2)

1. USSR author's certificate in 568607, cl. C 03 C 3/22, 1976. 2. US patent 3647491, cl. 10654, pub. 1972.