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Composite middle layer and method for brazing boron carbide composite ceramic and titanium alloy through composite middle layer

A technology of composite intermediate layer and composite ceramics, used in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the problems of large residual stress of joints, difficult welding of ceramic materials, cracking, etc., and achieve excellent bending strength. Effect

Pending Publication Date: 2021-11-05
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the above technical problems, the present invention provides a composite intermediate layer and a method for brazing boron carbide composite ceramics and titanium alloys, which can realize high-performance connection between boron carbide composite ceramics and titanium alloys, and solve the problem of boron carbide composite ceramics and titanium alloys. When the alloy is brazed, the ceramic material is difficult to weld and the residual stress of the joint is large, which leads to the problem of low joint strength or even cracking

Method used

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  • Composite middle layer and method for brazing boron carbide composite ceramic and titanium alloy through composite middle layer
  • Composite middle layer and method for brazing boron carbide composite ceramic and titanium alloy through composite middle layer
  • Composite middle layer and method for brazing boron carbide composite ceramic and titanium alloy through composite middle layer

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Embodiment 1

[0028] A composite middle layer is composed of an upper solder layer, a middle metal layer and a lower solder layer; both the upper and lower solder layers are made of Ag-Cu-Ti solder, and the material of the middle metal layer is copper. The composite intermediate layer in the present invention is represented by "Ag-Cu-Ti / Cu / Ag-Cu-Ti".

[0029] Among them, the Ag-Cu-Ti solder is a solder foil, the mass fractions of Ag, Cu, and Ti in the Ag-Cu-Ti solder are 68.8%, 26.7%, and 4.5%, respectively, and the size is 8mm×8mm×0.07mm ;Copper is copper foil, the purity of copper is 99.95%, the size is 8mm×8mm×0.8mm;

[0030] A method for brazing boron carbide composite ceramics and titanium alloys using the composite intermediate layer, specifically comprising the following steps:

[0031] 1) Polish the surface to be welded of boron carbide composite ceramics, titanium alloy, Ag-Cu-Ti solder and copper with SiC sandpaper, so that the surface roughness of the material is Ra≤5 μm;

[00...

Embodiment 2

[0039] This embodiment is the same as Embodiment 1, the only difference lies in step 4, the brazing temperature during brazing is 810°C.

[0040] After testing, the three-point bending strength of the brazed joint obtained in this embodiment is 69 MPa.

Embodiment 3

[0042] This embodiment is the same as Embodiment 1, the only difference lies in step 4, the brazing temperature during brazing is 830°C.

[0043] After testing, the three-point bending strength of the brazed joint obtained in this embodiment is 74 MPa.

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Abstract

The invention discloses a composite middle layer and a method for brazing boron carbide composite ceramic and a titanium alloy through the composite middle layer. The composite middle layer is composed of an upper brazing filler metal layer, a middle metal layer and a lower brazing filler metal layer. The upper brazing filler metal layer and the lower brazing filler metal layer both adopt Ag-Cu-Ti brazing filler metal, and the middle metal layer is made of copper. According to the method for brazing the boron carbide composite ceramic and the titanium alloy through the composite middle layer, the composite middle layer and the titanium alloy are sequentially placed on the to-be-brazed surface of the boron carbide composite ceramic to be assembled into a to-be-brazed workpiece of a sandwich structure, the to-be-brazed workpiece is subjected to high-temperature brazing connection under the vacuum condition, and a brazed joint obtained through the manner has excellent bending strength.

Description

technical field [0001] The invention belongs to the field of connecting ceramics and metals, in particular to a composite intermediate layer and a method for brazing boron carbide composite ceramics and titanium alloys. Background technique [0002] As a new type of non-oxide ceramic in special ceramics, boron carbide has very good properties: high melting point, high hardness, high elastic modulus, low density, good thermal stability, strong chemical corrosion resistance and neutron absorption Ability and so on. As a member of the superhard material family, boron carbide is mostly used in the armor of tanks, bulletproof vests and many industrial applications, as well as aerospace, nuclear engineering and other fields with broad application prospects. The boron carbide composite ceramic prepared by sintering, on the one hand, improves its mechanical properties, solves the problems of poor sinterability and low fracture toughness, on the other hand, the introduction of the s...

Claims

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Application Information

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IPC IPC(8): B23K1/19B23K1/20B23K1/008
CPCB23K1/19B23K1/206B23K1/008B23K2103/16
Inventor 钟志宏袁邦国袁东立吴玉程
Owner HEFEI UNIV OF TECH
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