Brazing method for porous ceramic and metal

A technology of porous ceramics and brazing method, which is applied in the direction of metal processing equipment, welding equipment, manufacturing tools, etc., can solve problems such as cracks and reduce the strength of brazed joints, and achieve the effects of improving performance, excellent mechanical properties, and good filling effect

Active Publication Date: 2017-07-14
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a large difference in thermal expansion coefficient and Young's modulus between ceramics and metals. During the connection process, the molten liquid solder will enter the pores of the ceramics under the capillary action of the porous ceramics to form an infiltration layer. The large difference in thermal expansion coefficient and elastic modulus between metal and ceramics causes a large residual stress between the brazing joint, infiltrated layer, and ceramic base material during the cooling process, and the existence of this internal stress will lead to cracks The formation of other defects, thereby reducing the strength of the brazed joint

Method used

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  • Brazing method for porous ceramic and metal
  • Brazing method for porous ceramic and metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Step 1. Select a porous silicon nitride ceramic substrate with a porosity of 45%, and use 200#, 400#, 800# SiC sandpaper to grind it step by step from coarse to fine until the surface is smooth and smooth. After polishing, put it into an acetone solution for ultrasonic cleaning 15-30 min. After cleaning, put it into a drying oven and dry at 50-100 °C for 6-10 h.

[0047] Step 2. Mix yttrium oxide powder, silicon oxide powder, aluminum oxide powder and nano-Si3N4 particles in a certain proportion, wherein the size of nano-Si3N4 particles is 20-50 nm, the mass fraction is 10wt.%, Y2O3, SiO2, Al2O3 In the raw material powder, the mass ratio of each substance is Y2O3:SiO2:Al2O3=(3~6):(2~3):(2~3), and the mechanical ball milling is carried out for 8~12 h, and the acetone solution is used as the medium to make the densification coating.

[0048] Step 3: Spray the prepared densified coating evenly on the surface of the pretreated porous silicon nitride ceramics with a pneumat...

Embodiment 2

[0054] Example 2: Step 1. Select a porous silicon nitride ceramic substrate with a porosity of 60%, and use 200#, 400#, 800# SiC sandpaper to grind step by step from coarse to fine until the surface is smooth and smooth, and then put in acetone after polishing Ultrasonic cleaning in the solution for 15~30min, after cleaning, put it in a drying oven, and dry it at 50 ℃~100 ℃ for 6~10 h;

[0055] Step 2. Mix yttrium oxide powder, silicon oxide powder, aluminum oxide powder and nano-Si3N4 particles in a certain proportion, wherein the size of nano-Si3N4 particles is 20-50 nm, the mass fraction is 20 wt.%, Y2O3, SiO2, In the Al2O3 raw material powder, the mass ratio of each substance is Y2O3:SiO2:Al2O3=(3~6):(2~3):(2~3), and the mechanical ball milling is carried out for 8~12 h, and the acetone solution is used as the medium to make a dense chemical coating,

[0056] Step 3: Use a pneumatic atomizing spray gun to uniformly spray the prepared densified coating on the surface of th...

Embodiment 3

[0063] The difference between this embodiment and embodiment 1 is that the porosity of the porous silicon nitride in step 1 is 50%. Other steps are identical with specific embodiment 1.

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Abstract

The invention discloses a brazing method for porous ceramic and metal. Compacting paint which comprises but not limited to yttrium oxide powder, silicon oxide powder, aluminum oxide powder and nano alpha-Si3N4 particles is uniformly sprayed to a to-be-welded surface of the porous ceramic and is heated to 1400 DEG C-1600 DEG C under the protective atmosphere, and heat preservation is conducted for 30 min-90 min, so that a compacting coating is formed on the sprayed surface; and then vacuum brazing is conducted with corresponding brazing filler metal, and thus better connection between the metal and the porous ceramic can be achieved. The invention aims at providing the vacuum brazing method which can achieve more effective high-strength connection between the porous ceramic and the metal, an obtained brazed joint of the porous ceramic and the metal is good in mechanical property, and the practical application requirement can be met.

Description

technical field [0001] The invention relates to metal-ceramic connection technology, in particular to a porous ceramic-metal brazing method for connecting porous ceramics and metals, which can be applied to various manufacturing fields involving porous ceramics and metal connectors , greatly optimizing the mechanical properties of the joint. Background technique [0002] At present, porous ceramics are widely used in the fields of aerospace and military industry because of their excellent mechanical properties, unique porous structure and wave permeability and other physical properties, and they often need to be combined with light weight and high strength superalloys for efficient bonding. However, there is a large difference in thermal expansion coefficient and Young's modulus between ceramics and metals. During the connection process, the molten liquid solder will enter the pores of the ceramics under the capillary action of the porous ceramics to form an infiltration la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/20B23K1/19
CPCB23K1/008B23K1/19B23K1/20
Inventor 宋晓国赵一璇周永东张辉梁亮曹健冯吉才
Owner HARBIN INST OF TECH AT WEIHAI
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