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A kind of brazing filler metal for connecting high nb-tial alloy and alumina ceramics and its connecting method

A technology of alumina ceramics and connection methods, which is applied in the direction of welding/cutting media/materials, welding/welding/cutting objects, welding equipment, etc., and can solve problems that need to be further improved

Active Publication Date: 2021-05-11
衢州天力紧固件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Brazing technology has its own huge advantages in the connection of TiAl alloys and ceramic materials, and has a good application prospect, but the brazing connection performance of TiAl alloys and ceramic materials currently developed needs to be further improved

Method used

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  • A kind of brazing filler metal for connecting high nb-tial alloy and alumina ceramics and its connecting method
  • A kind of brazing filler metal for connecting high nb-tial alloy and alumina ceramics and its connecting method
  • A kind of brazing filler metal for connecting high nb-tial alloy and alumina ceramics and its connecting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment, the composition and mass percentage of the brazing filler metal used for connecting the high Nb-TiAl alloy and alumina ceramics are: AgCu: 90%, Nb powder: 10%.

[0031] Utilize the high Nb-TiAl alloy of above-mentioned brazing material and alumina ceramics connection method to comprise the following steps:

[0032] 1) Weigh high-purity AgCu eutectic powder and Nb powder according to mass percentage, the particle size of AgCu powder is 38 μm, and the particle size of Nb powder is 20 μm, and use planetary high-energy ball mill to mix ball mill for 8 hours to prepare AgCu-Nb solder;

[0033] 2) The Al to be brazed 2 o 3 The ceramic is processed into a sample of 4mm×4mm×4mm, and the high Nb-TiAl alloy (composition is Ti-45Al-8Nb-0.2W-0.2B-0.1Y) is processed into a sample of 10mm×10mm×4mm;

[0034] 3) The high Nb-TiAl alloy sample and Al 2 o 3 The butt joint surface of the ceramic sample is processed flat, and the surfaces of the two materials to be w...

Embodiment 2

[0038] Adopt the high Nb-TiAl alloy in embodiment 1 and alumina ceramics connection method, to Al 2 o 3 Ceramics are brazed with high Nb-TiAl alloy materials, the difference is that in step 5) the temperature is raised to 810° C. for the second time and then kept for ten minutes, and other conditions are the same as in Example 1.

Embodiment 3

[0040]Adopt the high Nb-TiAl alloy in embodiment 1 and alumina ceramics connection method, to Al 2 o 3 Ceramics are brazed with high Nb-TiAl alloy materials, the difference is that in step 5) the temperature is raised to 840° C. for the second time and then kept for ten minutes, and other conditions are the same as in Example 1.

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Abstract

The invention discloses a solder used for connecting high Nb-TiAl alloys and alumina ceramics and a connecting method thereof, belonging to the technical field of welding. The solder includes AgCu powder and Nb powder, the mass percentage of AgCu powder is 90% of the total mass, and the mass fraction of Nb powder is 10% of the total mass. In the present invention, by adding Nb powder, AgCu-based solder is used to connect Al 2 o 3 The method of ceramics and high Nb-TiAl alloy not only enhances the gap-filling ability of the solder, but also reduces the thermal expansion coefficient mismatch of the materials to be connected, reduces the residual stress of the joint, and thus improves the shear strength of the brazed joint. The solder connection technology adopted in the invention is stable and reliable, easy to operate, has important application value, and is convenient for wide popularization.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a solder used for connecting high Nb-TiAl alloys and alumina ceramics and a connecting method thereof. Background technique [0002] al 2 o 3 Ceramics have the characteristics of good wear resistance and low thermal conductivity, and are widely used in energy converters and aerospace fields. However Al 2 o 3 The inherent rigidity and brittleness of ceramics limit their structural applications, so Al 2 o 3 The ceramic is bonded to its own metal parts. Thanks Al 2 o 3 The coefficient of thermal expansion of ceramics is lower than that of solder alloys and metal base materials, so the joints inevitably generate residual stress during the cooling process. Moreover, due to the poor plastic deformation ability of ceramics, the residual stress in ceramics cannot be released. How to achieve Al 2 o 3 Reliable bonding of ceramics and metals becomes a major challenge. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K1/008B23K1/20B23K103/18
CPCB23K1/008B23K1/20B23K1/206B23K35/3006B23K2103/18
Inventor 董多朱冬冬王晓红祝淑媛贺庆周兆忠
Owner 衢州天力紧固件有限公司