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High-pressure-resistant sealing glass ceramic and use thereof

A technology of glass-ceramics and sealing glass, which is applied in the field of high-pressure sealing glass-ceramics, can solve problems such as difficult to satisfy the use, and achieve the effects of increasing strength, improving pressure resistance performance, and high sealing strength

Active Publication Date: 2011-05-18
LIAONING SILICATE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, improving the strength and compressive capacity of sealing parts is generally done by cleaning the sealing materials and implementing complex sealing structures. However, these treatments can only improve the sealing strength of the sealing parts to a limited extent, and it is difficult to meet high use under pressure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A high-pressure-resistant sealing glass-ceramic, the sealing glass raw material is 5 grams in parts by weight. of which SiO 2 60.78 copies; Li 2 CO 3 25.9 servings; KH 2 PO 4 5.00; Al 2 O 3 2.73; K 2 CO 3 1.04;H 3 BO 3 1.77; TiO 2 0.41; ZnO 1.53; ZrO 2 0.83.

[0022] The raw materials weighed according to the above-mentioned weight share are mixed evenly, put into a 99 porcelain alumina crucible, smelted in a high-temperature electric furnace of molybdenum silicide at 1450-1550 ° C for 4-6 hours, completely melted and clarified, poured into cold water, quenched and cracked. The glass slag was dried in a 120°C oven for 2 hours, then ball-milled for 24 hours, and then passed through an 80-mesh sieve to obtain high-pressure-resistant sealing glass powder.

Embodiment 2

[0024] A high-pressure-resistant sealing glass-ceramic is used for sealing stainless steel, copper and Ni-based inconel alloys. The sealing process includes:

[0025] Add 4% paraffin by mass to the anti-high pressure sealing glass powder, stir and mix evenly at 70°C, press into a wax-containing glass blank, undergo a dewaxing process at 500°C for 4-8 hours, and then rapidly heat up. At 850°C for 15 minutes, the paraffin-removed glass blank is made; the connected metal shell and conductive column and the dewaxed glass blank are assembled into parts to be sealed, and placed in a sealing furnace at 1000°C. Seal for 20 minutes, cool down to 750°C at a rate of 10°C / Min, hold for 2 hours to precipitate lithium silicate grains, then cool down to 580°C at a rate of 25°C / Min, hold for 1 hour, and finally slowly drop to room temperature.

Embodiment 3

[0027] In order to obtain high-pressure-resistant sealing connectors, the sealing connectors that have been sealed according to the method of Example 2 are subjected to two-step heat treatment, including: the first step, keeping the temperature at 725 ° C for 2 hours; the second step, reducing the temperature to 625 DEG C, heat preservation for 2 hours, the sealing inserts with high sealing strength, chemical stability and mechanical strength are obtained.

[0028] Specific technical indicators of anti-high pressure sealing glass-ceramic

[0029] 1) Thermal expansion coefficient of glass: (room temperature-500℃)=10.2×10 -6 / °C;

[0030] 2) Transition temperature of glass: Tg=610℃;

[0031] 3) Glass sealing reference temperature: 1000℃;

[0032] 4) Two-way oil pressure test of sealing parts does not leak oil: 50Mpa.

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Abstract

The invention discloses high-pressure-resistant sealing glass ceramic, which comprises the following main components: 60 to 75 parts of SiO2, 10 to 16 parts of Li2O, 2.0 to 5.5 parts of P2O5, 2.0 to 4.6 parts of Al2O3, 1.0 to 3.8 parts of K2O, 1.0 to 2.1 parts of B2O3, 0.5 to 1.5 parts of TiO2, 1.0 to 6.0 parts of ZnO, and 0.5 to 8.0 parts of ZrO2. The high-pressure-resistant sealing glass ceramic is prepared by the following steps: uniformly mixing the components; smelting the mixture for 4 to 6 hours in a molybdenum silicide high-temperature electrical furnace at 1,450 to 1,550 DEG C; afterthe mixture is molten and clear completely, pouring the mixture into cold water, and quenching and cracking into glass slag; and drying, ball milling, and screening to obtain high-pressure-resistant sealing glass powder. The high-pressure-resistant sealing glass ceramic is particularly suitable for sealing stainless steel, copper and Ni-based inconel ally, and a high-pressure-resistant sealing element is obtained by high-temperature sealing and heat treatment. The sealing glass ceramic disclosed by the invention has a higher sealing strength, a higher thermal expansion factor, higher chemicalstability and a higher mechanical strength, and the process is simple, practical and suitable for industrial production.

Description

technical field [0001] The invention relates to a high-pressure-resistant sealing glass-ceramic, which is particularly suitable for sealing stainless steel, copper and Ni-based inconel alloys, and belongs to the technical field of glass material manufacturing and application. Background technique [0002] Electronic glass sealing technology occupies a very important position in the manufacturing process of electric vacuum and electronic components. With the expansion and deepening of the application field, while satisfying the electrical properties and practicability of the sealing parts, the requirements for the strength and pressure resistance of the sealing parts are also getting higher and higher. At present, the strength and compression resistance of the sealing parts are generally improved by cleaning the sealing materials and implementing complex sealing structures. However, these processing processes can only improve the sealing strength of the sealing parts to a lim...

Claims

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Application Information

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IPC IPC(8): C03C8/24C03C29/00
Inventor 杨殿来韩绍娟许壮志薛健张明黄大勇
Owner LIAONING SILICATE RES INST
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