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Nickelbase superalloy brazing filler metal and preparation method thereof

A technology of nickel-based high-temperature alloy and brazing material, which is applied in metal processing equipment, manufacturing tools, welding equipment, etc., can solve the problems of low reliability, poor appearance quality of joints, poor corrosion resistance, etc., and achieve the purpose of inhibiting flow, welding Effects of high seam strength, excellent wettability and gap filling properties

Active Publication Date: 2013-12-04
ZHEJIANG ASIA GENERAL SOLDERING & BRAZING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems such as flow, poor appearance quality of joints, low reliability and poor corrosion resistance in the brazing process of nickel-based solder brazing automobile EGR stainless steel cooler in the known technology, and to provide a A kind of nickel-based superalloy solder and preparation method thereof

Method used

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  • Nickelbase superalloy brazing filler metal and preparation method thereof
  • Nickelbase superalloy brazing filler metal and preparation method thereof
  • Nickelbase superalloy brazing filler metal and preparation method thereof

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Embodiment 1

[0014] Embodiment 1: A kind of nickel base superalloy brazing filler metal, is made up of the following components by weight percentage: Cr5.0%~20.0%, Si 4.0%~10.0%, Fe 0.1%~3.0%, Cu 0.1%~10.0% %, P 0.1% to 3.0%, the balance Ni.

[0015] The preparation method of the nickel-based superalloy brazing filler metal comprises the following steps: mixing the following components Cr, Si, Fe, Cu, P, Ni in proportion, adopting vacuum melting, gas atomization and ultrasonic sieving, and the brazing filler metal It is made into spherical powder of 240-600 meshes, and finally the solder powder is prepared into paste solder with an organic binder. Among them, P is mixed with Cr, Si, Fe, Cu, Ni in the form of Ni-P alloy.

[0016] Wherein the mass purity of above-mentioned Cr is 99.0.0%~99.9%, the mass purity of Si is 99.0.0%~99.9%, the mass purity of Fe is 99.0.0%~99.9%, the mass purity of Cu is 99.0.0% ~99.9%, the mass purity of Ni is 99.0.0% ~ 99.9%, and the mass purity of P is 99.0.0% ...

Embodiment 2

[0017] Embodiment 2: The present invention adopts to add Cu and Fe element to control unnecessary structure Ni 5 P 2 and Ni 2 The generation of P. Because Cu and Fe will compete with Ni to form corresponding phosphides, thereby reducing Ni 5 P 2 and Ni 2 The generation of P. Practice has shown that the Cu and Fe content below 0.1% can not achieve the above expected effect. When the Cu content exceeds 10.0% and the Fe content exceeds 3.0%, too much Cu and Fe will cause other problems, such as corrosion resistance Decline in performance or more susceptible to corrosion. Adding P element can improve the oxidation resistance of nickel-based solder and reduce the slag production of solder. When the P content is less than 0.1%, the effect is not obvious. When the P content exceeds 3.0%, the brittleness of the solder increases and the plasticity decreases.

[0018] The comprehensive welding performance of the nickel-based superalloy solder of the present invention is compared...

Embodiment 3

[0020] Embodiment 3: refer to figure 1 and 2 . It can be seen from the XRD pattern that the Ni5P2 and Ni2P phases in the brazing filler metal prepared by the present invention are significantly reduced after adding Cu and Fe elements.

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Abstract

The invention relates to a nickelbase superalloy brazing filler metal and a preparation method thereof. The nickelbase superalloy brazing filler metal comprises the following components in weight percentage: 5.0%-20% of Cr, 4.0%-10% of Si, 0.1%-3% of Fe, 0.1%-10% of Cu, 0.1%-3% of P and the rest of Ni. The preparation method comprises the following steps of: mixing the following components of Cr, Si, Fe, Cu, P and Ni according to proportion; preparing the brazing filler metal into 240-600mesh spherical powder by adopting vacuum smelting, gas atomization and ultrasonic sieving; and mixing the brazing filler metal into paste brazing filler metal by an organic binder. The invention has the advantages that the welding seam has high welding strength, the high temperature resistance is good due to a high melting point, and the flowing of the brazing filler metal can be effectively inhabited by added Cu and Fe; the brazing filler metal is suitable for brazing of stainless steel, and has excellent wettability and gap fallibility for the brazing of an automobile EGR (Exhaust Gas Recirulation) stainless steel cooler, and the tightness, corrosion resistance and welding seam strength of brazing members reach the technical requirements of an automobile EGR stainless steel cooler.

Description

technical field [0001] The invention relates to a nickel-based superalloy solder and a preparation method thereof. Background technique [0002] Exhaust gas recirculation (EGR) is currently the X The most effective measure of emissions. In cooled EGR technology, the critical assembly is the EGR cooler. EGR exhaust gas works under high temperature and high pressure, and the exhaust contains more sulfur and nitrogen oxides. When the exhaust gas is cooled, it can form strong oxides and cause corrosion to the cooler. Such working conditions require the cooler to be resistant to high temperature and corrosion. Among many brazing filler metals, nickel-based brazing filler metals are chosen because they have excellent oxidation resistance and corrosion resistance, good plasticity and medium strength. [0003] Traditionally, stainless steel vacuum brazing uses BNi-2, BNi-5 solder or copper-based solder, but the joints formed after brazing are sensitive to dilute sulfuric acid co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30
Inventor 顾小龙张腾辉王平红金霞张玉
Owner ZHEJIANG ASIA GENERAL SOLDERING & BRAZING MATERIAL
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