A brazing method for ceramics and metals or ceramics and ceramics

A brazing method and ceramic technology, applied in the field of ceramic/metal and ceramic/ceramic brazing, can solve problems such as cracks, rectangular groove stress concentration, lack of connection process methods, etc., to reduce costs, alleviate stress concentration, reduce Effect of residual thermal stress

Active Publication Date: 2018-07-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But again, the groove size in this report is on the order of millimeters, and stress concentration is prone to occur at the edge of the rectangular groove, which promotes cracks
On the other hand, there is currently no effective and easy-to-operate connection process for the brazing connection of larger-sized ceramics and metal materials.

Method used

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  • A brazing method for ceramics and metals or ceramics and ceramics
  • A brazing method for ceramics and metals or ceramics and ceramics
  • A brazing method for ceramics and metals or ceramics and ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Such as figure 1 shown in Al 2 o 3 Through-shaped open grooves 4 are processed on the surface of the ceramic 1. The width of the open grooves 4 is 10 μm, the depth of the open grooves 4 is 10 μm, and the interval between the open grooves is 40 μm. The smooth transition between the two walls of the opening groove and the lower part is narrowed, and its cross-section is "U"-shaped.

[0040] Next, directly on the Al to be welded 2 o 3 The interface between ceramic surface 1 and metal material 3 is placed with AgCu-Ti active solder foil 2 after ultrasonic cleaning and drying, the metal material 3 is 304 stainless steel, and the content of Ti in the AgCu-Ti active solder foil is 2wt. %, the thickness is 30 μm;

[0041] Carry out vacuum brazing in the furnace, the brazing temperature is 900°C, and the vacuum degree is not lower than 2×10 -2 Pa, keep warm for 10 minutes, control the cooling rate at 10°C / min, and cool to room temperature, that is, the 10mm×10mm Al 2 o 3...

Embodiment 2

[0043] Such as Figure 6 As shown, on both sides Al 2 o 3 The surface of the ceramic 1 is processed with through opening grooves 4, the width of the opening grooves 4 is 200 μm, the depth of the opening grooves 4 is 200 μm, and the interval between the opening grooves is 1000 μm. The smooth transition between the two walls and the bottom of the opening groove narrows, and its cross section is nearly semicircular, quadrilateral, "U" or "V".

[0044] Next, directly on the Al to be welded 2 o 3 An AgCu-Ti active solder foil 2 that has been ultrasonically cleaned and dried is placed between the surfaces of the ceramic 1. The content of Ti in the AgCu-Ti active solder foil is 2.0wt.%, and the thickness is 400 μm.

[0045] Carry out vacuum brazing in the furnace, the brazing temperature is 900°C, and the vacuum degree is not lower than 2×10 -2 Pa, keep warm for 10 minutes, control the cooling rate at 10°C / min, and cool to room temperature, that is, the 10mm×10mm Al 2 o 3 Cera...

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Abstract

The present invention provides a method for brazing a ceramic and a metal or a ceramic and a ceramic, and relates to a methods for brazing a ceramic and a metal, a ceramic and a ceramic, a ceramic and a ceramic-based composite, and a ceramic-based composite and a ceramic-based composite. The method comprises: making periodic or aperiodic open slots on a to-be-brazed surface of a ceramic or a ceramic-based composite, wherein the distance between adjacent open slots, the width of each open slot, and the depth of each open slot are of order of micrometers; and then placing an active brazer between to-be-brazed surfaces, and achieving effective connections between the ceramic and a metal, between the ceramic and a ceramic, or between the ceramic and a ceramic-based composite by using a vacuum brazing method. The method provided by the present invention can effectively increase a wetting area of the active brazer on the surface, and reduce residual stress of ceramic surface, thereby improving bonding strength between the ceramic and the metal and between the ceramic and the ceramic. The method is also applicable to connection between C / C composites, Cf / Sic composites and other materials of high hardness and high brittleness.

Description

technical field [0001] The invention relates to a ceramic / metal and ceramic / ceramic brazing method, which belongs to the technical field of welding. Background technique [0002] Ceramics are a promising high-temperature structural material, and Al 2 o 3 Ceramics are an example, which have excellent properties such as high temperature resistance and wear resistance. Metal materials generally have better toughness. In some military and industrial applications, materials are required to have good toughness and high temperature resistance at the same time, so it is often necessary to connect ceramics with metal materials or two different ceramic materials to form ceramic-metal, ceramic-ceramic composite materials . This composite material has a good application prospect. [0003] Ceramics can generally be connected by brazing or diffusion welding, but it is very difficult to directly connect ceramics and metal materials or different ceramic materials by these methods, main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B37/00C04B37/02
Inventor 刘磊张颖川邹贵生吴爱萍
Owner TSINGHUA UNIV
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