Brazing is a crucial process in various industries, and the choice of brazing metals and alloys can significantly impact the quality and performance of the final product.
10 Essential Types of Brazing Metals and Alloys Explained
1. Aluminum-Silicon Brazing Alloys
These alloys are widely used in the aerospace industry due to their low density and high specific strength.
The most common composition is the Al-Si eutectic system with 11.7% silicon.
This alloy has a eutectic temperature of 577°C, making it excellent for brazing high-melting-point aluminum alloys like 3A21.
It offers good wettability, fluidity, and corrosion resistance of brazed joints.
2. Silver-Based Brazing Materials
Silver-based alloys are versatile and can be used to braze almost all ferrous and non-ferrous metals.
They have a low melting point and good wetting and caulking performance.
Elements like zinc, tin, nickel, cadmium, indium, and titanium are often added to enhance their properties.
3. Copper-Based Brazing Materials
These materials are widely used for brazing copper and copper alloys, carbon steel, cast iron, stainless steel, high-temperature alloys, and hard alloys.
They offer good electrical and thermal conductivity, strength, and corrosion resistance.
Common additives include phosphorus, silver, zinc, tin, manganese, nickel, cobalt, titanium, silicon, and boron.
4. Nickel-Based Brazing Materials
Nickel-based alloys are crucial for brazing parts that operate under high temperatures or in corrosive media.
They are used for brazing stainless steel, high-temperature alloys, iron-based alloys, and diamond, cemented carbide, and C/C composites.
Elements like chromium, boron, silicon, and phosphorus are added to enhance thermal strength and reduce melting points.
5. Cobalt-Based Brazing Materials
These are typically used for brazing cobalt-based alloys and other materials requiring high-temperature performance.
The addition of silicon and tungsten enhances their melting temperature and high-temperature performance, respectively.
6. Titanium-Based Brazing Materials
Titanium alloys are used for vacuum brazing, diffusion brazing, and sealing of various materials, including titanium, titanium alloys, tungsten, molybdenum, tantalum, niobium, graphite, ceramics, and gemstones.
The addition of elements like zirconium, beryllium, manganese, cobalt, and chromium improves oxidation resistance and corrosion resistance.
7. Gold-Based Brazing Materials
Gold alloys are suitable for brazing important parts in the electronics and aviation industries.
They can braze metals like copper, nickel, and stainless steel.
The alloys are categorized based on their main components, such as Au-Cu, Au-Ni, Au-Pd, and others.
8. Palladium-Based Brazing Materials
Palladium alloys are used in the electronics and aerospace industries.
They are categorized into graded brazing, high-temperature brazing, and special-property brazing materials.
The alloys include Pd-Ni, Pd-Cu, Pd-Au, and others, with additional elements like Si, B, V, and Ti.
9. Amorphous Brazing Materials
These are developed through rapid cooling and quenching technology, suitable for brazing plane joints.
They are available in various bases like nickel, copper, copper-phosphorus, aluminum, and tin-lead.
They are used in industries like aerospace and electronics.
10. Selecting the Right Brazing Material
Each of these brazing materials and alloys is selected based on the specific requirements of the materials being joined, the environmental conditions, and the mechanical demands of the application.
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