Large power tube lead-free sealed glass powder and its preparation method

Abstract

The invention discloses a larger power tube leadless seal glass and preparing method, which comprises the following steps: (1) allocating raw material with molar percentage rate at 20-60% P2O5, 25-55%ZnO,3-23% SiO2 and 3- 13% Na2O; adding B2O3, CuO and Li2O; blending these raw materials together; (2) loading the raw materials into quartz crucible under 200 deg.c; insulating 1.5 h; (3) melting under 1050-1250 deg.c; insulating 1-3 h; obtaining seal glass with bulking factor at 65-140*10-7 deg.c and seal temperature at 420-570 deg.c.

Description

technical field

[0001] The invention belongs to the technical field of chemical industry, in particular to a lead-free sealing glass powder for high-power tubes. Background technique

[0002] The existing high-power tubes often use low-melt sealing glass. In the low-melt sealing glass, the lead-containing sealing glass has high resistance, low dielectric loss, high refractive index and dispersion, and absorbs high-energy radiation, and has a low softening temperature. With a series of characteristics such as good chemical stability, it has a wide range of applications in low-melt sealing. PbO-SiO2, PbO-B2O3, PbO-B2O3-SiO2, PbO-ZnO-B2O3 and other systems are often used in the preparation of lead-containing sealing glass at home and abroad. The poisoning dose of lead is only 1 mg, and the lethal dose is 1 g. However, the PbO content in most low-melting sealing glasses is even as high as 60-80 mol%. The heavy metal lead contained in such products will cause serious harm to the...

Examples

Embodiment 1-4

[0029] Table 1 (mol%)

[0030]

[0031] Weigh each component according to the molar percentage of the raw materials in Table 1, then fully mix the raw materials, keep the mixture at 200 ° C for 1.5 hours, and then melt it at the melting temperature of 1050 ° C ~ 1250 ° C, keep it warm 1 to 2 hours.

[0032] The chemical stability of the glass was measured after constant temperature in deionized water at 90°C for 9 hours.

[0033] In Table 1, P 2 o 5 , ZnO, SiO 2 and Na2 Four kinds of oxides of O are used as essential components. By adding different other components and adjusting the ratio relationship between the components, the expansion coefficient can be obtained from 65 to 140×10 -7 / °C, sealing glass with a sealing temperature of 420-570°C.

technical field

[0001] The invention belongs to the technical field of chemical industry, in particular to a lead-free sealing glass powder for high-power tubes. Background technique

[0002] The existing high-power tubes often use low-melt sealing glass. In the low-melt sealing glass, the lead-containing sealing glass has high resistance, low dielectric loss, high refractive index and dispersion, and absorbs high-energy radiation, and has a low softening temperature. With a series of characteristics such as good chemical stability, it has a wide range of applications in low-melt sealing. PbO-SiO2, PbO-B2O3, PbO-B2O3-SiO2, PbO-ZnO-B2O3 and other systems are often used in the preparation of lead-containing sealing glass at home and abroad. The poisoning dose of lead is only 1 mg, and the lethal dose is 1 g. However, the PbO content in most low-melting sealing glasses is even as high as 60-80 mol%. The heavy metal lead contained in such products will cause serious harm to the...

Examples

Embodiment 1-4

[0029] Table 1 (mol%)

[0030]

[0031] Weigh each component according to the molar percentage of the raw materials in Table 1, then fully mix the raw materials, keep the mixture at 200 ° C for 1.5 hours, and then melt it at the melting temperature of 1050 ° C ~ 1250 ° C, keep it warm 1 to 2 hours.

[0032] The chemical stability of the glass was measured after constant temperature in deionized water at 90°C for 9 hours.

[0033] In Table 1, P 2 o 5 , ZnO, SiO 2 and Na2 Four kinds of oxides of O are used as essential components. By adding different other components and adjusting the ratio relationship between the components, the expansion coefficient can be obtained from 65 to 140×10 -7 / °C, sealing glass with a sealing temperature of 420-570°C.

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