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Method for brazing porous Si3N4 ceramic and Invar alloy

An alloy and ceramic technology, applied in welding media, welding equipment, metal processing equipment, etc., can solve problems such as residual thermal stress, reduce joint strength, etc., and achieve the effect of improving joint performance and reliable joint.

Active Publication Date: 2016-06-08
黑龙江省工研院资产经营管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is to solve the technical problem that Invar alloy will form larger residual thermal stress on the ceramic and metal interface during the brazing cooling process and reduce the joint strength, and provides a brazing porous Si 3 N 4 Ceramic and Invar Alloy Methods

Method used

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  • Method for brazing porous Si3N4 ceramic and Invar alloy
  • Method for brazing porous Si3N4 ceramic and Invar alloy
  • Method for brazing porous Si3N4 ceramic and Invar alloy

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specific Embodiment approach 1

[0037] Specific implementation mode 1: Brazing porous Si in this implementation mode 3 N 4 The method of ceramic and Invar alloy is carried out according to the following steps:

[0038] 1. Put the polished Invar alloy and Cu foil into absolute ethanol, and ultrasonically clean it for 15 minutes;

[0039] 2. Mix the Ag-Cu-Ti solder with the binder, and then coat it on the porous Si 3 N 4 On the lower surface of the ceramic, mix the Ag-Cu solder with the binder, and then coat the upper surface of the Invar alloy, and then sandwich the Cu foil between the Ag-Cu-Ti solder and the Ag-Cu solder to obtain the sample ;

[0040] 3. Put the compact on the sample and put it in the vacuum sintering furnace. The vacuum degree is 6×10 -3 Under the condition of Pa, heat the sample to 300°C at a heating rate of 10°C / min and keep it warm for 10-30min, then heat the sample to 850-950°C at a heating rate of 10°C / min. ×10 3 Pa~4×10 3 Keep it warm for 20min under the condition of Pa, then...

specific Embodiment approach 2

[0041] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the method of polishing Invar alloy in step one is as follows:

[0042]Use 400# metallographic sand, 800# metallographic sand, and 1200# metallographic sandpaper to polish the Invar alloy until the surface is bright without scratches. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0043] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the method of polishing the Cu foil in step 1 is as follows:

[0044] Use 400# metallographic sand, 800# metallographic sand, and 1200# metallographic sandpaper to polish the Cu foil until the surface is bright without scratches, and then use a diamond polishing agent with a particle size of 0.5 μm to polish the surface of the Cu foil until the surface No scratches under the microscope. Others are the same as those in the first or second embodiment.

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Abstract

The invention provides a method for brazing porous Si3N4 ceramic and an Invar alloy, relates to a brazing method and aims to solve the technical problems that larger residual thermal stress can be formed on a ceramic and metal interface and reduces joint strength in a brazing cooling process of the Invar alloy. The method comprises the following steps: 1, Ag-Cu-Ti brazing filler metal and a binder are mixed and applied to the lower surface of the porous Si3N4 ceramic, Ag-Cu brazing filler metal and the binder are mixed and applied to the upper surface of the Invar alloy, then Cu foil is clamped between the Ag-Cu-Ti brazing filler metal and the Ag-Cu brazing filler metal, and a test piece is obtained; 2, a briquette is added to the upper surface of the test piece, and the test piece is arranged in a vacuum sintering furnace, subjected to heat preservation at 300 DEG C, subjected to heat preservation at 850-950 DEG C and then cooled. The joint strength can reach 73 MPa with adoption of the method. The invention belongs to the field of brazing.

Description

technical field [0001] The present invention relates to a brazing method. Background technique [0002] Advanced structural ceramic materials have gained attention in various special environments such as national defense, energy, aerospace, machinery, petrochemical, metallurgy, electronics and other industries due to their good heat resistance, high strength, and corrosion resistance, and have a good The prospect of application has also become the focus of scientific research in many countries, and a lot of human and material resources have been invested. [0003] Among many wave-transparent ceramic materials, nitride-based ceramic materials (such as porous Si 3 N 4 Ceramics) have a series of outstanding properties such as good dimensional stability, strong bearing capacity, and good thermal shock resistance, thus becoming an ideal material that meets the standards of high-speed cruise missile radomes. A lot of manpower and physics have been invested and extensive researc...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/20B23K35/30
CPCB23K1/0008B23K1/008B23K1/20B23K1/206B23K35/302B23K2103/52
Inventor 张杰刘佳音刘春凤王天鹏
Owner 黑龙江省工研院资产经营管理有限公司
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