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Method for brazing Hastelloy N alloy by using Ni-Cr-Si solder paste

A ni-cr-si, solder paste technology, applied in the field of alloy welding, can solve the problems of low isothermal solidification and weak brazing joint performance, and achieve the effects of simplified operation, good oxidation resistance and firm connection

Inactive Publication Date: 2020-11-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It turns out that B base alloys are less isothermally solidifiable than silicon, resulting in weaker brazed joints

Method used

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  • Method for brazing Hastelloy N alloy by using Ni-Cr-Si solder paste

Examples

Experimental program
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Embodiment 1

[0026] Such as figure 1 As shown, the present embodiment provides a method for brazing Hastelloy N alloy using Ni-Cr-Si solder paste, comprising the following steps:

[0027] (1) Perform surface treatment on Hastelloy N alloys respectively. Hastelloy N alloys include the first piece of Hastelloy N alloy 1 and the first piece of Hastelloy N alloy 3; the surface treatment process is: respectively place two pieces of Hastelloy N alloy in acetone for ultrasonic cleaning In order to remove the oil stain on its surface, two pieces of Hastelloy N alloy were then taken out from acetone and dried, and then polished the surface to be welded with 320#, 600#, 800#, 1000#, 1500# sandpaper, and then used 2.5 μm diamond polishing agent for polishing, and finally the polished Hastelloy N alloy is placed in alcohol for ultrasonic cleaning and drying.

[0028] (2) Take the two Hastelloy N alloys after surface treatment in step (1), apply an appropriate amount of Ni-Cr-Si solder paste 2 evenly ...

Embodiment 2～4

[0031] A method for brazing Hastelloy N alloys using Ni-Cr-Si solder paste. The method steps are repeated in Example 1 to obtain Examples 2 to 4. The difference is that the brazing temperature of 1120° C. is replaced by 1160° C. and 1200° C. respectively. ℃ and 1240℃, the brazing between Hastelloy N alloys is finally completed.

[0032] Such as figure 2 As shown, the method of Example 4 is used to connect two Hastelloy N alloys. After the brazing is completed, the structure of the center of the formed brazing seam is formed. After the brazing is completed, black strips of Ni are formed between the two Hastelloy N alloys, based on the Ni-based solid solution 4 and continuously distributed on the grain boundary 5. 2 Si compound 6 and white bulk Ni distributed on and within the grain boundary 5 3 (Mo,Cr) 3 (Si,C) phase 7 of the brazing seam structure, which increases the strength of the brazed joint.

[0033] The performance test of the shear strength of the Hastelloy N allo...

Embodiment 5～7

[0037] A method for brazing Hastelloy N alloys using Ni-Cr-Si solder paste, the steps of which are repeated in Example 4 to obtain Examples 5 to 7, the difference being that the time for holding the heat at a brazing temperature of 1240° C. is replaced respectively For 1min, 30min and 50min, the brazing of Hastelloy N alloy is finally completed.

[0038] The performance testing of the shear strength of the Hastelloy N alloy brazed joints finally prepared in Example 4 and Examples 5-7 was performed at room temperature, and the results of the measured room temperature shear strength are shown in Table 2.

[0039] The average shear strength of the brazed joint of the Hastelloy N alloy obtained under different holding times in table 2

[0040] detection group Holding time / min Shear strength / MPa Example 5 1 541 Example 4 10 643 Example 6 30 492 Example 7 50 493

[0041] Comparing the shear test results of the Hastelloy N alloy brazed j...

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Abstract

The invention belongs to the technical field of alloy welding, and particularly relates to a method for brazing a Hastelloy N alloy by using a Ni-Cr-Si solder paste. The method comprises the steps that firstly, surface treatment is conducted on the Hastelloy N alloy to be welded; secondly, two pieces of Hastelloy N alloy subjected to surface treatment are taken, the to-be-welded face of the firstpiece of Hastelloy N alloy is evenly coated with a proper amount of Ni-Cr-Si solder paste to form a coating layer, the coating layer and the to-be-welded face of the second Hastelloy N alloy are bonded and fixed through glue, and a welded workpiece is obtained; and the welded workpiece is put into a vacuum brazing furnace to be subjected to heating activation treatment, so that glue in the weldedworkpiece and a binding agent in the Ni-Cr-Si solder paste are fully volatilized, cooling and solidification are conducted, and brazing connection between the Hastelloy N alloys is completed. The method has the advantages that an obtained joint is compact in structure, stable and reliable, the method is easy and convenient to operate, low in cost, free of damage to the original structure of base metal and the like, the shear strength of the obtained joint can reach 643 MPa, and the method is suitable for being used in a high-temperature environment.

Description

technical field [0001] The invention belongs to the technical field of alloy welding, and in particular relates to a method for brazing Hastelloy N alloy by using Ni-Cr-Si solder paste. Background technique [0002] Molten salt reactor, as one of the six candidate types of fourth-generation nuclear reactors, has the advantages of sustainable use of nuclear fuel, high heat conversion efficiency, and high reliability, and has attracted widespread attention. In the manufacturing process of reactor pressure vessels, a large number of plates are required to be spliced ​​and welded. Therefore, the welding quality of nuclear reactor pressure vessels will be related to the reliability, safety and economy of reactor operation, which has attracted great attention. Therefore, welding technology very strict requirements. Hastelloy N alloy is a solid solution strengthened nickel-based superalloy with excellent high-temperature mechanical properties, oxidation resistance, corrosion resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/20B23K3/06B23K3/08
CPCB23K1/008B23K1/20B23K1/206B23K3/06B23K3/08
Inventor 贺艳明陈刚强闾川阳周正强肖凡孙元郑文健马英鹤杨建国
Owner ZHEJIANG UNIV OF TECH
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