Silicon carbide ceramic braze welding connection method

A technology of silicon carbide ceramics and connection methods, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of small weldable workpieces, poor wettability of metal brazing filler metals, and large residual stress, and achieve the goal of microstructure. Density, good industrial application prospects, and the effect of reducing residual internal stress

Active Publication Date: 2019-10-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor wettability of metal solder, large residual stress and small weldable workpieces in the traditional brazing method, and to provide a silicon carbide ceramic brazing connection method

Method used

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  • Silicon carbide ceramic braze welding connection method

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specific Embodiment approach 1

[0016] Specific embodiment 1: In this embodiment, a silicon carbide ceramic brazing connection method is completed according to the following steps:

[0017] 1. According to the mass fraction Al 2 o 3 12%~15%, SiO 2 52%~63% and the balance is CaO or CaCO 3 Weigh Al respectively 2 o 3 , SiO 2 and CaO or CaCO 3 ;

[0018] 2. The Al taken in step 1 2 o 3 , SiO 2 and CaO or CaCO 3 Mixing, grinding by wet grinding method, drying treatment; melting after drying treatment, then water quenching, grinding by wet grinding method after water quenching, sieving after grinding, and drying treatment to obtain glass-ceramic brazing material;

[0019] 3. Pretreating the silicon carbide ceramics to be brazed to obtain pretreated silicon carbide ceramics;

[0020] 4. Mix the glass-ceramic solder obtained in step 2 with the binder evenly, and then evenly coat between the pretreated silicon carbide ceramics obtained in step 3 to obtain the silicon carbide ceramic connectors to be w...

specific Embodiment approach 2

[0025] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in the step one, according to the mass fraction Al 2 o 3 14.7%, SiO 2 62% and CaO23.3%, or Al 2 o 3 12.4%, SiO 2 52.4% and CaCO 3 35.2% were weighed Al 2 o 3 , SiO 2 and CaO or CaCO 3 .

[0026] Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0027] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the steps of the two wet grinding methods described in step two are as follows: use absolute ethanol as the medium, and mix the Al 2 o 3 , SiO 2 and CaO or CaCO 3 , with a speed of 550rpm mechanical ball milling for 8h ~ 10h, the mass ratio of the ball to material is 2:1.

[0028] Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a silicon carbide ceramic braze welding connection method. The invention aims to solve the problems in the traditional braze welding method that a metal brazing material has low wettability, the residual stress is large and a weldable workpiece is small. The method comprises the following steps: mixing Al2O3, SiO2 and CaO or CaCO3, drying after grinding, melting, performing water quenching, grinding again, sieving and drying to obtain a microcrystal glass brazing material; pretreating to-be-brazed silicon carbide ceramic to obtain pretreated silicon carbide ceramic; mixing the microcrystal glass brazing material and an adhesive uniformly and coating the pretreated silicon carbide ceramic with the mixture to obtain a silicon carbide ceramic to-be-welded connecting piece; and performing braze welding treatment on the silicon carbide ceramic to-be-welded connecting piece and performing furnace cooling to obtain silicon carbide ceramic after braze welding connection. The invention can obtain the silicon carbide ceramic braze welding connection method.

Description

technical field [0001] The invention relates to a method for brazing and connecting silicon carbide ceramics. Background technique [0002] Silicon carbide ceramics is a high-temperature structural material with great development prospects. In addition to excellent high-temperature mechanical properties (strength, creep resistance, etc.), silicon carbide ceramics also have high bending strength, oxidation resistance, corrosion resistance, and wear resistance. and low coefficient of friction. In the field of aviation and aerospace engines, silicon carbide ceramics are widely used in order to meet the requirements of high-performance engines for weight reduction and high-temperature stability. At present, silicon carbide ceramics can be connected by mechanical connection, bonding, fusion welding, brazing and diffusion welding. [0003] There are more difficulties in the high-reliability connection of silicon carbide ceramics. Because of its hardness, brittleness, high meltin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/00B23K35/363
CPCC04B37/003B23K35/3601C04B2237/10C04B2237/365
Inventor 孙湛陈曦张丽霞毛玥冯吉才
Owner HARBIN INST OF TECH
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