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A kind of silicon carbide ceramic brazing connection method
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A technology of silicon carbide ceramics and connection methods, which is applied in the direction of welding equipment, welding media, welding/cutting media/materials, etc., can solve the problems of small weldable workpieces, poor wettability of metal solder, and large residual stress, etc., and achieve effective The effect of connection, dense tissue, and reduction of residual internal stress
Active Publication Date: 2022-03-01
HARBIN INST OF TECH
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[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
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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 we...
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 550rpm mechanical ball milling treatment for 8h~10h, the mass ratio of ball to material is 2:1.
[0028] Other steps are the same as those in Embodiment 1 or 2.
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Abstract
A siliconcarbideceramicbrazing connection method relates to a siliconcarbideceramicbrazing connection method. The purpose of the invention is to solve the problems of poor wettability of metal solder, large residual stress and small weldable workpieces in the traditional brazing method. Method: Al 2 o 3 , SiO 2 and CaO or CaCO 3 mixing, grinding, drying, melting, water quenching, grinding, sieving, and drying to obtain glass-ceramic solder; pretreating the siliconcarbide ceramics to be brazed to obtain pretreated silicon carbide ceramics; The glass-ceramic solder and the binder are evenly mixed and coated between the pretreated silicon carbide ceramics to obtain the silicon carbide ceramics to be welded joints; the silicon carbide ceramics joints to be welded are brazed, and then The furnace is cooled to obtain the silicon carbide ceramics after brazing connection. The invention can obtain a silicon carbide ceramic brazing 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 diffusionwelding. [0003] There are more difficulties in the high-reliability connection of silicon carbide ceramics. Because of its hardness, brittleness, high meltin...
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