Electricity vacuum glass products lead-free seal glass and preparing method thereof

Abstract

The invention discloses a non-lead seal glass of electric vacuum glass product, which comprises the following parts: 30%-55% P2O5, 30%-55% ZnO, 0%-10% Al2O3, 0%-3. 5% MnO2, wherein the adding component is composed of 0%-10% Na2O, 0%-10% K2O, 0-20 mol% B2O3, 0-5mol%BaO and 0-1mol%Ti2O. The making course comprises the following steps: 1. blending each raw material completely; 2. loading in the quartz copple; insulating under 1050-1250 deg. c for 0. 5-2h; 3. cooling the fused glass liquid; solidifying; obtaining the sealing glass with bulking coefficient at 70-140X10-7 / deg. c and sealing temperature at 440-600 deg. c.

Description

technical field [0001] The invention belongs to the field of electric vacuum glass preparation, and in particular relates to a lead-free sealing glass for electric vacuum glass products and a preparation method thereof. Background technique [0002] Sealing glass powder is often used in the production process of existing electric vacuum glass products, which usually requires a lower melting point and a lower expansion coefficient. In the past, this sealing glass mainly used PbO-ZnO, PbO-B 2 o 3 It is lead-containing glass powder. Because lead-containing sealing glass has a series of characteristics such as large resistance, low dielectric loss, high refractive index and dispersion, high-energy radiation absorption, low softening temperature, and good chemical stability, it is used in low-melt sealing has a wide range of uses. [0003] However, lead is a highly toxic substance, which has caused great harm to the human body during production and use, especially glass with hi...

AI Technical Summary

Problems solved by technology

The softening temperature of the glass is 400-430°C, and the coefficient of thermal expansion is 145-170×10 -7 / °C, although the softening temperature of this glass is suitable for low-melt sealing, but the thermal expansion coefficient of this glass is relatively large, it cannot be used for medium and low expansion coefficient sealing, and it contains a small amount of lead, which cannot meet the requirements of lead-free. Due to the noble metal ZrO 2 The content is relatively high, so there is also no advantage in terms of cost

[0005] U.S. Patent No. P5153151 discloses a phosphate sealing glass whose molar composition is Li 2 O: 0-15%, Na 2 O: 0~20%, K 2 O: 0-10%, ZnO: 0-45%, Ag 2 O: 0-25%, Tl 2 O: 0-25%, PbO: 0-20%, CuO: 0-5%, CaO: 0-20%, SrO: 0-20%, P 2 o 5 : 24~36%, Al 2 o 3 : 0~5%, CeO 2 : 0~2%, BaO: 0~20%, SnO: 0~5%, Sb 2 o 3 : 0~61%, Bi 2 o 3 : 0~10%, B 2 o 3 : 0 to 10%, the transition temperature of the glass is 300 to 340°C, and the coefficient of thermal expansion is 135 to 180×10 -7 / °C, the disadvantage of this glass is that Tl 2 The toxicity of O is very high. At the same time, the thermal expansion coefficient of glass is relatively large, so it cannot be used for sealing with medium and low expansion coefficients.

[0006] USP: 20020019303 proposes a P 2 o 5 -SnO-ZnO system sealing glass frit, the sealing temperature of the glass is 430-500°C, because this kind of sealing glass frit needs to be produced and sealed in a reducing atmosphere, it is not conducive to industrial application, and because it contains a large amount of The cost of SnO is relatively expensive, so the application of this sealing glass has great limitations

[0007] More promising in the lead-free sealing glass system is Bi 2 o 3 -B 2 o 3 -SiO 2 and ZnO-B 2 o 3 -SiO 2 , vanadate, phosphate and other systems, but the sealing temperature of the first two is relatively high, and the cost of bismuth and vanadate systems is high

Images