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Method for sealing stainless steel and ceramic

A technology of stainless steel and ceramics, applied in the field of metallurgy, can solve the problems of high price and high product cost

Inactive Publication Date: 2010-06-23
SHENYANG SCI INSTR RES CENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the known domestic industrialized sealing products generally use ceramics and iron-nickel alloys, oxygen-free copper, tungsten, molybdenum, expansion alloys, etc. In addition to the general requirements for these metals, the main requirement is that the coefficient of linear expansion is close to that of ceramics. However, these materials are rare metals and are relatively expensive, resulting in relatively high product costs

Method used

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  • Method for sealing stainless steel and ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. Immerse the stainless steel parts in sodium hydroxide (NaOH) with a concentration of 50g / L and a temperature of 60°C for 4 hours. After taking it out, wash it thoroughly in warm water, then wash it with cold water, dehydrate it with absolute ethanol, dry it, and remove it. grease, dirt;

[0019] b. the stainless steel parts 1 and 3 obtained in step a are used as anodes, and the cathode is made of lead. The electrolyte formula and polishing specifications are: orthophosphoric acid (H3PO4) 65%, sulfuric acid (H2SO4) 15%, chromic anhydride (CrO3) 6% , 14% deionized water, current density 0.2A / cm 2 , voltage 12V, working temperature 75°C, time 5min; after electropolishing, put the parts in 5% ammonia water and neutralize them for 20s, then wash them with water, dehydrate them with absolute ethanol, and dry them to remove the surface scale;

[0020] c. Nickel-plate the stainless steel parts 1 and 3 obtained in step b, and burn them in a hydrogen furnace to 800° C., keep ...

Embodiment 2

[0024] a. Immerse the stainless steel parts in sodium hydroxide (NaOH) with a concentration of 100g / L and a temperature of 60°C for 2 hours. After taking it out, wash it thoroughly in warm water, then wash it with cold water, dehydrate it with absolute ethanol, dry it, and remove it. grease, dirt;

[0025] b. the stainless steel parts 1 and 3 obtained in step a are used as anodes, and the cathode is made of lead. The electrolyte formula and polishing specifications are: orthophosphoric acid (H3PO4) 65%, sulfuric acid (H2SO4) 15%, chromic anhydride (CrO3) 6% , 14% deionized water, current density 0.5A / cm 2 , voltage 6V, working temperature 75°C, time 10min; after electropolishing, put the parts into 5% ammonia water to neutralize for 15s, then wash with water, dehydrate with absolute ethanol, and dry to remove the surface scale;

[0026] c. Nickel-plate the stainless steel parts 1 and 3 obtained in step b, and burn them in a hydrogen furnace to 800° C., keep the heat for 20 mi...

Embodiment 3

[0030] a. Immerse the stainless steel parts in sodium hydroxide (NaOH) with a concentration of 75g / L and a temperature of 60°C for 3 hours. After taking it out, wash it thoroughly in warm water, then wash it with cold water, dehydrate it with absolute ethanol, dry it, and remove it. grease, dirt;

[0031] b. the stainless steel parts 1 and 3 obtained in step a are used as anodes, and the cathode is made of lead. The electrolyte formula and polishing specifications are: orthophosphoric acid (H3PO4) 65%, sulfuric acid (H2SO4) 15%, chromic anhydride (CrO3) 6% , 14% deionized water, current density 0.4A / cm 2 , voltage 8V, working temperature 75°C, time 8min; after electropolishing, put the parts into 4% ammonia water to neutralize for 13s, then wash with water, dehydrate with absolute ethanol, and dry to remove the surface scale;

[0032] c. Nickel-plate the stainless steel parts 1 and 3 obtained in step b, and burn them in a vacuum furnace to 800°C, keep them warm for 20 minutes...

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Abstract

The invention relates to metal metallurgy, in particular to a method for sealing stainless steel and ceramic. The method comprises the following steps: a, removing grease and dirt on a stainless steel piece by an alkali washing method; b, electrolyzing the stainless steel piece obtained in the step a; c, plating nickel to the stainless steel piece obtained in the step b, then sintering the stainless steel piece in a hydrogen furnace or a vacuum furnace to 800 DEG C, preserving the heat for 20 minutes, and then discharging the stainless steel piece when the temperature is reduced to 50 DEG C; d, metallizing a ceramic piece; and e, overlapping the stainless steel piece obtained in the step c and the ceramic piece obtained in the step d, keeping the clearance fit states of the stainless steel piece and the ceramic piece in the clearance of between 0.05 and 0.10 millimeter, then putting an Ag-Cu solder on the inflow upper part of the solder, and controlling the rising temperature of the furnace at 150 DEG C per 15 minutes, fully scattering the solder when the temperature rises to 780 DEG C, then preserving the heat for 5 minutes, and reducing the temperature, wherein the temperature reducing speed and the temperature rising speed are the same. The parts prepared by the scheme do not release air under the vacuum condition, have no magnetism, and have good corrosion and heat resistance, low-temperature strength and mechanical property; and the price of materials is moderate.

Description

technical field [0001] The invention relates to metallurgy, in particular to a sealing method for stainless steel and ceramics. Background technique [0002] Ceramics have become an important part of modern high-tech materials, and the welding and application of ceramics and metal dissimilar materials are increasingly paid attention to by people. At present, the known domestic industrialized sealing products generally use ceramics and iron-nickel alloys, oxygen-free copper, tungsten, molybdenum, expansion alloys, etc. In addition to the general requirements for these metals, the main requirement is that the coefficient of linear expansion is close to that of ceramics. However, these materials are rare metals and are relatively expensive, resulting in relatively high product costs. Contents of the invention [0003] In order to overcome the above-mentioned shortcoming, the object of the present invention is to provide a kind of sealing method of stainless steel and pottery...

Claims

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Application Information

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IPC IPC(8): C04B37/02
Inventor 赵淑艳谭庆生
Owner SHENYANG SCI INSTR RES CENT CHINESE ACAD OF SCI
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