Vacuum brazing process for super-Ni laminated material and Cr18-Ni8 stainless steel

A technology of cr18-ni8 and laminated materials, applied in the direction of welding/cutting media/materials, welding equipment, manufacturing tools, etc., can solve problems such as difficult to adapt to precision and complex-shaped connectors, and achieve good interface bonding and brazing seam formation Beautiful, interface combined with stable effect

Inactive Publication Date: 2011-03-30
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the filler wire tungsten argon arc welding, which is essentially a fusion welding method, is difficult to adapt to some precision and complex-shaped connections, and there is an urgent need for a welding process suitable for connecting precision and complex-shaped connections.

Method used

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  • Vacuum brazing process for super-Ni laminated material and Cr18-Ni8 stainless steel
  • Vacuum brazing process for super-Ni laminated material and Cr18-Ni8 stainless steel

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The super nickel laminated composite material with a thickness of 2.6mm is vacuum brazed with Cr18-Ni8 stainless steel with a thickness of 2.6mm. The workpiece has a length of 30mm and a width of 10mm. The thickness of the base layer of the super nickel laminated composite material is 2 mm, and the thickness of the cladding layers on both sides is 0.3 mm.

[0030] Using Ni-Cr-P solder, the main chemical composition (mass fraction) is: Ni 75.8%, Cr 14%, P 10%, C≤0.06%.

[0031] The specific vacuum brazing process steps are as follows:

[0032] Place the connected parts in an alcohol solution for ultrasonic cleaning for 3 minutes and dry them. Use No. 800 fine sandpaper to remove the oxide film on the surface of the base metal to be welded to make it as smooth as possible, rinse with alcohol and then blow dry.

[0033] In the form of butt joint, place the butt joint workpiece on the steel plate covered with graphite paper. The function of graphite paper is to prevent t...

Embodiment 2

[0037] Butt vacuum brazing of super nickel laminate composites with a thickness of 2.6 mm. The length of the connected piece is 60mm and the width is 20mm. Ni-Cr-P series solder paste is used, the chemical composition (mass fraction) is: Ni 75.8%, Cr 14%, P 10%, C≤0.06%. The heating temperature of vacuum brazing is 940℃, the holding time is 20min, and the vacuum degree is 1.33×10 -4 Pa.

[0038] The specific vacuum brazing process steps are as follows:

[0039] Place the test plate at 70-80°C with 10% Na by volume 2 CO 3Ultrasonic cleaning in the solution for 5 minutes, take out, rinse with cold water and dry. Use No. 800 fine sandpaper to remove the oxide film on the surface of the joint to make it as smooth as possible, rinse with alcohol and then blow dry.

[0040] In the form of butt joints, the connected parts are placed on the steel plate covered with graphite paper, and the Ni-Cr-P series paste solder is applied to the gap between the brazing joints. The joint gap...

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Abstract

The invention discloses a vacuum brazing process for a super-Ni laminated material and Cr18-Ni8 stainless steel, which is characterized by comprising the following steps: (1) prior to brazing, cleaning the super-Ni laminated material and the Cr18-Ni8 stainless steel, and removing oil stains on the surfaces of parts and the oxidation film on the surfaces to be brazed; (2) carrying pick-up fitting and fixing on the parts to be brazed in a super-Ni laminated material-brazing filler metal-stainless steel mode, wherein the brazing filler metal is Ni-Cr-P nickel-based brazing filler metal; and (3) carrying out vacuum brazing on the fixed workpiece in a vacuum brazing furnace, wherein the vacuum degree of the vacuum brazing furnace is greater than 1.33*10<-3>Pa, the brazing heat temperature is 920-1100 DEG C, and the holding time is 5-25 min. By using the method, brazed joints having the advantages of no crack, fine interface combination and beautiful surface appearance can be obtained, and the reliable connection of laminated materials can be realized, thereby meeting the requirements of aerospace, power and other fields for high-performance materials.

Description

technical field [0001] The invention relates to a brazing process of laminated composite materials, in particular to a vacuum brazing process of super nickel laminated composite materials and stainless steel dissimilar metals, and belongs to the technical field of material welding. Background technique [0002] Laminated composite material is a new type of material developed to meet the special performance requirements of aerospace technology. The super nickel laminated composite material is made of a super nickel cladding layer and a chromium-nickel alloy base layer by vacuum isostatic rolling. Vacuum isostatic rolling is a vacuum rolling method that maintains a constant rolling pressure by controlling the pressure under vacuum conditions. This laminated composite material uses pure nickel as the toughened cladding layer, which has good high temperature resistance and fatigue resistance. The thickness of the super nickel clad layer is only 0.2-0.3 mm, and the Ni content (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/20B23K35/30B23K103/18
Inventor 李亚江张永兰吴娜
Owner SHANDONG UNIV
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