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Brazing method for welding titanium-based high-entropy alloy and silicon nitride ceramic

A technology of silicon nitride ceramics and high-entropy alloys, which is used in welding equipment, metal processing equipment, tin feeding devices, etc. Simple and reliable, high shear strength, excellent comprehensive mechanical properties

Pending Publication Date: 2021-06-01
QUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the brittleness of silicon nitride ceramics makes it difficult to process components with complex shapes, and its application range is greatly limited.

Method used

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  • Brazing method for welding titanium-based high-entropy alloy and silicon nitride ceramic
  • Brazing method for welding titanium-based high-entropy alloy and silicon nitride ceramic

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The preparation of solder paste is a general process of weighing and mixing, and the innovation is not very obvious, but the mass ratio of 9:1 is the result obtained after many tests.

[0029] 2) Stack the titanium-based high-entropy alloy and silicon nitride ceramics pretreated in step 1) layer by layer in the order of titanium-based high-entropy alloy / brazing paste / silicon nitride ceramics to obtain a brazing block . That is, the brazing block is composed of titanium-based high-entropy alloy, brazing paste and silicon nitride ceramics. The titanium-based high-entropy alloy is at the top, the middle is brazing paste, and the bottom layer is silicon nitride ceramics. In order to improve the welding strength, the thickness of the brazing solder paste in the brazing block can be set to 100-200 μm.

[0030] Then put the brazing block into the graphite mold, or directly stack the titanium-based high-entropy alloy, brazing paste and silicon nitride ceramics in the graphite ...

Embodiment 1

[0034] Silver-based brazing material (68.8Ag-26.7Cu-4.5Ti) and brazing flux are prepared in a ratio of 9:1 to form a solder paste. The surfaces of titanium-based high-entropy alloy and silicon nitride ceramics were successively polished step by step with 80-2000 mesh metallographic sandpaper, and then the samples to be welded were cleaned with alcohol after polishing the surface of the samples. Then stack the titanium-based high-entropy alloy / brazing paste / silicon nitride ceramic layer by layer in a graphite mold, and place a vacuum brazing furnace for brazing after placing a compact on the top layer. Wherein, the thickness of the brazing solder paste is 100 μm to 200 μm, and a certain pressure is applied by placing the pressing block to ensure the wetting and spreading of the solder and the base material.

[0035] Using the step-up brazing process and different heating and cooling rates, the vacuum degree of the vacuum brazing furnace is controlled at not less than 8×10 -3 P...

Embodiment 2

[0038]Using the same method as in Example 1 to prepare solder solder paste and braze the titanium-based high-entropy alloy and silicon nitride ceramics, the difference is that the titanium-based high-entropy alloy and silicon nitride ceramics are brazed up to brazing The welding target temperature is 820° C. and then kept for 60 minutes, and the rest of the process is the same as in Example 1.

[0039] The shear strength of the joint between the brazed titanium-based high-entropy alloy and the silicon nitride ceramic was detected by a universal testing machine to be 53 MPa.

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Abstract

The invention discloses a brazing method for welding a titanium-based high-entropy alloy and silicon nitride ceramic. The brazing method comprises the following steps that 1, silver-based brazing filler metal powder and brazing flux are prepared into brazing filler metal soldering paste according to the mass ratio of 9: 1; 2, the pretreated titanium-based high-entropy alloy and the pretreated silicon nitride ceramic are stacked layer by layer according to the sequence of the titanium-based high-entropy alloy, the filler metal soldering paste and the silicon nitride ceramic to obtain a brazing assembly block; 3, the brazing assembly block is placed in a mold, a pressing block is placed on the uppermost layer of the brazing assembly block, and then the brazing assembly block is placed in a brazing furnace; 4, after the brazing block is heated to 800 DEG C-900 DEG C in a stepped manner through the brazing furnace, heat preservation is conducted, and cooling and nature cooling are performed to the room temperature along with the furnace; and 5, the brazing process of the titanium-based high-entropy alloy and the silicon nitride ceramic is completed. According to the method, the titanium-based high-entropy alloy and the silicon nitride ceramic are brazed through the silver-based brazing filler metal soldering paste through the brazing process, the strength of a connector between the titanium-based high-entropy alloy and the silicon nitride ceramic after brazing is 21-86 MPa, reliable connection of the titanium-based high-entropy alloy and the silicon nitride ceramic is achieved, and meanwhile a technical scheme is provided for welding of the titanium-based high-entropy alloy.

Description

technical field [0001] The invention relates to the field of brazing, in particular to a brazing method for welding titanium-based high-entropy alloys and silicon nitride ceramics using a silver-based powder brazing filler metal ratio. Background technique [0002] The widespread use of metal materials has greatly promoted the progress of human society. Over the past hundred years, metal materials have developed the fastest in history. Through unremitting efforts, scientific researchers have effectively expanded the application fields of metal materials. From single-element-based materials to alloys and amorphous materials, every development of materials has brought great changes to scientific and technological life, and the discovery and proposal of high-entropy alloys is a big step forward for the world. Its comprehensive mechanical properties such as high strength, high hardness, high heat resistance, high temperature oxidation resistance, and high temperature softening...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K1/008B23K1/20B23K3/06B23K3/08
CPCB23K1/20B23K3/08B23K3/06B23K1/0008B23K1/008B23K3/0607
Inventor 朱冬冬董多黄鹏刘莉陈壮王晓红周兆忠
Owner QUZHOU UNIV
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