Titanium powder plays an important role in brazing process, especially suitable for ceramic-metal connection, high-temperature alloy welding, electronic packaging, etc.
Main uses
1. As a component element of brazing filler metal
Titanium powder can be mixed with other metal powders to prepare brazing alloy powder for high-temperature brazing.
2. As a brazing filler metal additive
When brazing inert materials such as ceramics or carbides, titanium powder can react with surface oxides, remove surface oxide films, reduce the surface tension of liquid brazing filler metal, enhance wettability, and improve joint strength and heat resistance.
3. Connecting titanium with dissimilar materials
When brazing pure titanium or titanium alloy with dissimilar materials such as stainless steel, aluminum alloy, and ceramics, the use of brazing filler metal containing titanium powder can improve the interface bonding performance and inhibit the formation of brittle phases
4. Used for vacuum or protective atmosphere brazing
Titanium powder can avoid oxidation in a vacuum or argon environment and give full play to its active role. It is commonly used in high-reliability welding of aerospace and electronic devices.
Specific usage of titanium powder
1. Preparation of brazing powder mixture
Mix titanium powder with other alloy powders in proportion, add organic solvent (such as ethanol, etc.) to make a paste, and evenly apply it to the joint to be brazed.
Advantages: Controllable composition, suitable for brazing parts with complex shapes
2. Preparation of composite brazing material
Mix titanium powder with brazing alloy powder and press it into foil or wire for easy automated welding.
3. Pre-coating method
Spray or brush titanium powder suspension (solvent is ethanol or acetone) on the surface of the parent material, and form a titanium coating after drying
Precautions
1. Anti-oxidation treatment: Titanium powder needs to be stored in a sealed manner and needs to be dried before use (baked at 120℃ for 1 hour); vacuum should be ≤10⁻³Pa or use high-purity argon during brazing.
2. Particle size selection: Coarse titanium powder (>10μm) reacts slowly and is suitable for thick gaps; nano titanium powder has high activity, but high cost and easy to fly.
3. Dosage control: Excessive titanium will cause joint embrittlement, usually the addition amount is ≤10% (ceramic brazing) or ≤5% (metal brazing).
4. Compatibility test: The reaction products of titanium powder and parent material/brazine need to be tested in advance to avoid the formation of harmful phases (such as brittle Ti-Fe compounds).
By rationally utilizing the active properties of titanium powder, the application scope of brazing technology can be significantly expanded, especially in the field of high-performance material connection, which plays an irreplaceable role.