1、 Overview

Nickel based superalloys refer to superalloys based on nickel (generally greater than 50%), which have certain strength, good oxidation and hot corrosion resistance at temperatures ranging from 650 to 1100 ℃. Nickel based alloys are the materials with the widest range of applications, the most grades, and the highest strength in superalloys (also known as superalloys).

The material characteristics of nickel based alloys include: (1) Super excellent performance: they can maintain high strength at high temperatures, and have excellent mechanical properties such as creep resistance and fatigue resistance, as well as oxidation and corrosion resistance characteristics, as well as good plasticity and weldability. (2) Alloy addition is extremely complex: Nickel based alloys often add more than ten alloy elements to improve corrosion resistance in different environments; And solid solution strengthening or precipitation strengthening. (3) Extremely harsh working environment: Nickel based alloys are widely used in various harsh service conditions, such as high-temperature and high-pressure parts of aerospace engine gas chambers, structural components in nuclear, petroleum, and marine industries, and corrosion resistant pipelines.

2、 Application

In aerospace engines, the working conditions are high temperatures of 600 to 1200 ℃, and the stress action is complex, resulting in stringent requirements for materials; Nickel based superalloys have sufficient high heat resistance, good plasticity, resistance to high-temperature oxidation and gas corrosion, and long-term organizational stability. Therefore, nickel based superalloys are mainly used for manufacturing turbine engine hot end components and various high-temperature components of aviation rocket engines.

At the same time, with the development of industrial construction in China, nickel based superalloys are gradually being used in civil industries such as energy and power, transportation, petrochemical industry, metallurgy and mining, and glass and building materials. In this regard, nickel based superalloys are mainly used in turbocharged turbines for diesel and internal combustion engines, industrial gas turbines, valve seats for internal combustion engines, and steering rollers.

Nickel based superalloy materials mainly include BNi-2, BNi-5, BNi-7, Inconel 718, etc.

The physical and electron micrographs of some metal powders are shown below (TIJO Metal Materials Co., Ltd.)

1.

Brand:BNi-2 nickel based brazing filler

Features: Low brazing temperature, small melting temperature gap, good fluidity, and can be used to braze thinner workpieces

Purposes: vacuum brazing, stainless steel brazing, alloy steel brazing, diamond brazing, high-temperature alloy brazing, etc

2.

Brand:BNi-7 nickel based brazing filler

Features: eutectic solder, low soldering temperature, excellent fluidity, low corrosivity, brazable stainless steel thin parts, boron free

Purposes: alloy steel, stainless steel, high-temperature alloys, refractory metals, sintered diamond products, etc