Non-pressure braze welding method for ZrO2 ceramic and stainless steel or Al2O3 ceramic

A stainless steel and brazing technology, applied in the field of pressureless brazing connection between ZrO2 ceramics and stainless steel or Al2O3 ceramics, can solve the problems of difficult connection between zirconia and stainless steel, difficult to eliminate welding stress, large elastic modulus of stainless steel, etc. The effect of high temperature performance, welding stress relief, and simple preparation process

Inactive Publication Date: 2008-03-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large elastic modulus and poor plasticity of stainless steel, the welding stress

Method used

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  • Non-pressure braze welding method for ZrO2 ceramic and stainless steel or Al2O3 ceramic
  • Non-pressure braze welding method for ZrO2 ceramic and stainless steel or Al2O3 ceramic
  • Non-pressure braze welding method for ZrO2 ceramic and stainless steel or Al2O3 ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] As shown in Figure 2, a ZrO 2 Method for pressureless brazing of ceramics and stainless steel.

[0030] 1. Preparation of zirconia ceramic parts:

[0031] (1) Cleaning treatment of zirconia ceramics: the zirconia ceramic piece 1 used is molded, sintered in an air furnace at 1550°C for 2h, and contains 3mol% Y 2 o 3 Partially stabilized zirconia ceramics with a size of Φ17×6mm. After rigorous cleaning of the zirconia ceramic part 1 (sequentially boiled with dilute alkali, rinsed with a large amount of tap water, ultrasonically cleaned with acetone, and boiled with distilled water), it is then dried in an oven at 80°C for 3 hours.

[0032] (2)TiH 2 Preparation of ointment: first commercially available TiH 2 Powder, add absolute ethanol, roll and mix ball mill for 80h, dry, the median diameter is 2.785μm according to the particle size distribution test, pass through a 200 mesh sieve, and then put in the finely ground TiH 2 Add ethylene oxalate to the glass bottle of ...

Embodiment 2

[0042] As shown in Figure 3, another ZrO 2 Method for pressureless brazing of ceramics and stainless steel.

[0043] 1. Preparation of zirconia ceramic parts:

[0044] (1) Cleaning treatment of zirconia ceramics: After the commercially available zirconia ceramic tube 11 is strictly cleaned (in turn, washed with dilute alkali, rinsed with a large amount of tap water, ultrasonically cleaned with acetone, boiled with distilled water), then placed in an oven for 80 ℃×3h drying treatment.

[0045] Other methods in this step are the same as (2), (3), (4) in embodiment 1-. where TiH 2 The paste is coated on the two ends of the zirconia ceramic tube 11 with a height of 4 cm side and end faces to form two TiH 2 Coating4.

[0046] 2. Treatment of stainless steel: The stainless steel used is processed into stainless steel welded pipe 12 and stainless steel welded cover 15 with holes respectively, and nickel-plated on the required brazing surface, wherein, the brazing end surface of ...

Embodiment 3

[0050] a ZrO 2 Ceramic and Al 2 o 3 Ceramic pressureless brazing method

[0051] 1. Preparation of zirconia ceramic parts. This step technology is with embodiment 1.

[0052] 2. Metallization treatment on the surface of alumina ceramics:

[0053] (1) Preparation and treatment of alumina ceramics: the alumina ceramics used are molded by molding technology, sintered in an air furnace at 1550 ° C × 2h, containing 95wt% Al 2 o 3 , 2.5wt% SiO 2 And 2.5wt% MgO alumina ceramic piece, the size is Φ17×6mm. The brazed surface of the final sintered alumina ceramic piece is polished, cleaned (in turn, washed with dilute alkali, rinsed with water, ultrasonically cleaned with acetone, and boiled with distilled water), and then dried.

[0054] (2) Mo-Mn sintering metallization: Coat the Mo-Mn metal paste adjusted with Mo-Mn composite powder, collodion solution and oxalate on the brazing surface of the alumina ceramic sheet treated in the previous step, Paste adjustment method is the...

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Abstract

The present invention discloses process of non-pressure brazing between ZrO2 ceramic and stainless steel or Al2O3 ceramic. The process includes the following steps: 1. preparing TiH2 brazing paste; 2. painting TiH2 brazing paste; 3. treating the brazed surface in stainless steel and ceramic workpiece; and non-pressure assembling and vacuum brazing. It features the vacuum brazing step including reaching vacuum degree superior to 8x10<-3> Pa, maintaining for certain time in at least two temperatures including one temperature higher than the vacuum decomposition temperature of TiH2 and the brazing temperature, slow heating before reaching the brazing temperature and slow cooling to room temperature. The process is simple, low in cost, and widely applicable.

Description

technical field [0001] The invention relates to a method for brazing ceramics and stainless steel or ceramics, in particular to a ZrO 2 Ceramic and stainless steel or Al 2 o 3 Method for joining ceramics by pressureless brazing. Background technique [0002] Regarding the connection between ceramics and stainless steel or ceramics, there are mainly structural reliability of the connectors, such as strength and high temperature resistance, manufacturing costs and other considerations. At present, for the connection technology between ceramics and stainless steel or ceramics, there are mainly methods such as sintered stainless steel powder method (such as Mo-Mn method), active stainless steel brazing and diffusion welding. The sintered stainless steel powder method, especially the Mo-Mn method, has a relatively mature process. At present, this method is mainly used for Al 2 o 3 ceramics. Due to ZrO 2 There is almost no glass phase in the ceramic body, and the zirconia c...

Claims

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Application Information

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IPC IPC(8): C04B37/02
Inventor 乔冠军刘桂武王红洁王继平杨建锋高积强卢天健金志浩
Owner XI AN JIAOTONG UNIV
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