SU977419A1 - Glass - Google Patents

Description

; (54) GLASS

The invention relates to glass compositions used in electron-fiber tubes for soldering glass with fiberglass children and 47HX, 47HXR and 38NCD alloys. Known glass tl3 / containing,; w.%: SiOi 67,71; AljOj 2-4; BjOj 1.5-3, Of BaO 6-8: CaO l, 5-3.0i MgO 1.5-3.0 NagO 4-7.0 / 5-8. and SbaO 0.2-0.5. This glass does not provide a stable vacuum tight spa, because of the high softening temperature. () and the corresponding firing temperature during the manufacture of the spa, oxidation of the reinforcement occurs. Non-relieving stresses occur in the spa unit, which leads to glass leakage or cracking. The closest to the technical essence and the achieved result to the proposed is C2 glass including, wt.%: SiO 67.5; AljOa 5.0; BaO 12.0; NajO 7.0; Krf) 1.0; Zi 030.4; F 0.9. However, this glass does not provide a vacuum-tight spa with 47HX, 47HXP, 38NCD alloys and glass fiber parts due to the high expansion coefficient (.93.0. D) The purpose of the invention is to reduce the thermal expansion coefficient. The goal is SIC, OaP ME .. L If -P Gg: BaO, NajO, Kju, Zi20, F, additionally contains M (in the following ratio of components, wt.%: SiOj 68.6-72. AljOa 4.5-5, 5 BaO 10.0-11.5 NajO 5.0-7.0 CdO 5.0-7.0 ZijO 0.3-0.7 F / i 0.3-0.7 MgO 0.5-1, 4, with IlNa, il3%. Specific glass compositions are listed in Table 1. For the synthesis of glasses, the following e technical raw materials: sand, alumina, barium carbonate, magnesia (or magnesium carbonate), soda, potashg lithium hydroxide, sodium fluorosilicate. They produce cylinders, as well as tubes, capillaries, rods. The properties of glasses are given in Table 2. The proposed glass provides a vacuum spa with alloy 1, 0

70.4 5.0

11.0

1.4

11.5

68.6 5.5

0.5

10.0

72.0 4.5

0.5

5.5 0.6

6.0

0.7

5.0 0.3

7.0

7.0 0.7

0.3

5.0

Table 2 m 47HH, 47HHR, 38NKD, which makes it possible to increase the yield of products by 50%. Table

Claims (1)

Claim Glass including S Ϊ 0 ₂ , 1 ₂ 0 ₃ , BaO, Na ^ O, K ₂ 0, Zf ₂ O, E ^, characterized in that, in order to reduce the coefficient of thermal expansion, it additionally contains Md0 in the following ratio of components, wt.%: Si0 ₂ 68.6-72 A1 _a 0 ₃ 4-5 ^ 5.5 Bao 10.0-11.5 N a 2 0 5.0-7.0 K ₂ 0 5.0-7.0 Zi, 0 o; 3-0.7 b 0.3-0.7 MDO 0.5-1.4 moreover, 5ZNa ₂ 0 + Κ ₂ 0 + Ζί ₂ 0 13%.