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A ceramic and metal connection method of flexible graphite + brazing combined sealing structure

A technology of flexible graphite and combined sealing, applied in welding medium, welding equipment, metal processing equipment, etc., can solve the problems of large differences in physical performance parameters, bulky bolt connection structure, and inability to guarantee sealing performance, etc., to achieve small size and increase flexibility Graphite sealed structure, the effect of simple structure

Inactive Publication Date: 2013-10-30
XIAN AEROSPACE PROPULSION INST
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Problems solved by technology

The structure of the bolted connection is bulky. Due to the large difference in physical performance parameters such as the molecular structure and thermal expansion coefficient of the brazing or chemical vapor deposition metal and the ceramic, it is difficult to form an effective combination. It cannot guarantee sufficient bonding force and reliable connection parts. Sealing performance

Method used

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  • A ceramic and metal connection method of flexible graphite + brazing combined sealing structure

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Embodiment Construction

[0010] figure 1 Shown is a schematic diagram of a metal-ceramic connection structure obtained by using the metal-ceramic connection method of the present invention. The connection structure is composed of a ceramic ring 1 , a titanium alloy ring 2 , a flexible graphite ring 3 and a niobium alloy ring 4 . The niobium alloy ring 4 and the ceramic ring 1 are connected by brazing, and the brazing butt joint surface adopts a tapered surface structure, and the fit clearance is generally 0.02 mm to 0.10 mm. The angle and length of the cone surface are selected according to the structure size of the brazing connection interface. When the structure size is small, a smaller angle and length of the cone surface are selected. In the present invention, the selected cone length is 5mm-25mm, the selected cone angle α is 5°-15°, and the brazing temperature is usually 800°C-1200°C. The niobium alloy ring 4 is welded to the titanium alloy ring 2, usually by vacuum electron beam welding. The ...

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Abstract

The invention discloses a method for connecting ceramics and metals with a flexible graphite + brazing combined sealing structure, adopting a flexible graphite + brazing combined sealing form, using niobium alloy as a transition metal, brazing the ceramics, and welding the titanium alloy head Connection, to achieve reliable connection strength between the titanium alloy head of the thrust chamber and the body of the ceramic material; the joint surface of the ceramic end face and the titanium alloy head adopts a flexible graphite sealing structure to ensure that the joint surface has reliable sealing performance at high temperatures; thus It not only ensures sufficient connection strength, but also realizes reliable sealing. The invention can also be popularized and applied to other fields that need to realize the connection between ceramics and metals.

Description

technical field [0001] The invention relates to a method for connecting ceramics and metals, which is used in a thrust chamber of a rocket engine to realize the connection between the metal head of the thrust chamber and the body of a ceramic matrix composite material. At the high-temperature part of the joint of the thrust chamber head and body, the joint method of ceramic and metal with a combined sealing structure of flexible graphite and brazing is adopted, which can not only ensure sufficient joint strength, but also achieve reliable sealing. The invention can also be popularized and applied to other fields that need to realize the connection between ceramics and metals. Background technique [0002] Ceramic matrix composites have the advantages of light weight, good high-temperature mechanical properties, and good thermal shock resistance, erosion resistance, and ablation resistance, and are gradually used in rocket engine thrust chambers. According to different usage...

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Application Information

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IPC IPC(8): B23K1/19B23K35/30B23K103/18
Inventor 常小庆刘晓伟
Owner XIAN AEROSPACE PROPULSION INST
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