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Method for connecting ceramic cover for antenna and metal connecting ring

A ceramic antenna and metal connection technology, which is applied in metal processing equipment, welding/welding/cutting items, welding equipment, etc., can solve the problems of residual stress rise, ceramic fracture, and ceramic brittleness, etc., to reduce microcracks and relieve residual Stress, easy operation effect

Active Publication Date: 2021-06-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the connection area of ​​large-scale structural parts is large, and the residual stress rises sharply with the increase of component size. On the other hand, due to the porous Si 3 N 4 Ceramics are easily broken, and the brazing process is very easy to cause porous Si due to excessive residual stress. 3 N 4 ceramic fracture

Method used

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  • Method for connecting ceramic cover for antenna and metal connecting ring
  • Method for connecting ceramic cover for antenna and metal connecting ring
  • Method for connecting ceramic cover for antenna and metal connecting ring

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0028] Specific implementation mode 1: This implementation mode is a connection method between a ceramic radome and a metal connecting ring, which is specifically carried out according to the following steps:

[0029] 1. Clean the Invar alloy connecting ring with absolute ethanol and acetone in sequence to remove the oil stains on the pre-welded surface;

[0030] The center of the Invar alloy connecting ring is a through hole, the upper part of the Invar alloy connecting ring is a hollow circular truncated structure, and the diameter of the upper end is smaller than the diameter of the lower end; the lower part of the Invar alloy connecting ring is a hollow cylinder structure; the upper part of the Invar alloy connecting ring The outer diameter of the bottom end is smaller than the outer diameter of the lower part of the Invar alloy connecting ring;

[0031] Second, the porous Si 3 N 4 Wipe the surface of the ceramic radome with cotton to remove the dust on the surface; the ...

specific Embodiment approach 2

[0038] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 3, put it in an oven for drying at 40°C. Others are the same as the first embodiment.

specific Embodiment approach 3

[0039] Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that: the thickness of the inner brazing filler metal described in step 3 is 50 μm-100 μm. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for connecting a ceramic cover for antenna and a metal connecting ring, and relates to a method for connecting ceramic and metal. The technical problem of high residual stress of an existing porous silicon nitride ceramic / Invar alloy radome joint is solved. According to the method, through the structural design of an antenna cover, the problem that the residual stress of the joint of the existing porous silicon nitride ceramic / Invar alloy antenna cover is relatively high is solved, so that the annular antenna cover has no obvious microcracks after being connected. According to the design of a middle connecting layer, the middle connecting layer is composed of upper-layer brazing filler metal, a soft middle layer and lower-layer brazing filler metal, wherein the upper-layer brazing filler metal is AgCuTi brazing filler metal foil, the soft middle layer is made of Cu foam, Cu corrugation or foamed nickel, and the lower-layer brazing filler metal is AgCu brazing filler metal foil. The method is applied to the welding field.

Description

technical field [0001] The invention relates to a method for connecting ceramics and metals. Background technique [0002] The radome is an important structural part of the aircraft, which needs to have excellent dielectric properties, good thermal shock resistance, and low thermal expansion coefficient. Porous Si 3 N 4 Ceramics as a radome can meet the above requirements, but porous Si 3 N 4 The brittleness of ceramic materials makes it difficult to directly assemble with other parts of the aircraft. Therefore, it is necessary to connect a metal ring at the end of the radome to realize assembly with other parts of the aircraft through the metal ring. Some patents have introduced the use of organic glue to connect the radome and the metal ring, but its strength is low and its high temperature resistance is not good. Therefore, the use of ceramic-metal brazing technology will greatly improve the strength and high temperature resistance of the connection structure. Invar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K1/008B23K1/20B23K35/30
CPCB23K1/0008B23K1/008B23K1/206B23K35/3006B23K35/302B23K2103/52
Inventor 张杰文粤刘春凤孙良博
Owner HARBIN INST OF TECH
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