Titanium Brazing Alloys
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Titanium Brazing
Titanium is a very important but costly metal. Its use in a number of important areas makes it more valuable. Titanium is joined to itself or other metals through different brazing processes, such as resistance brazing, furnace brazing, and induction brazing in vacuum or in an argon atmosphere. However torch brazing can't be applied to titanium.
Common Types of Titanium Brazing Alloys
| Composition of Titanium Brazing Alloys |
Melting Range °F (°C) |
Brazing Range °F (°C) |
| Ti-15Cu-15Ni | 1655-1742 (902-950) | 1800-1920 (980-1050) |
| Ti-15Cu-25Ni | 1653-1679 (901-915) | 1705-1760 (930-960) |
| Ti-24Zr-16Cu-16Ni-0.5Mo | 1535-1560 (835-850) | 1630-1690 (890-920) |
| Ti-20Zr-20Cu-20Ni | 1555-1572 (848-856) | 1560-1620 (870-900) |
Titanium
Titanium is a transition metal having the symbol Ti and atomic number 22. It is a strong, light, lustrous, corrosion-resistant, with white-silvery-metallic color. It can be alloyed with a number of other elements such as iron, aluminum, molybdenum, etc to produce strong lightweight alloys. These alloys are used for aerospace (jet engines, missiles, and spacecraft), military, industrial process (chemicals and petro-chemicals, desalination plants, pulp and paper), in automotive sectors, etc.
| Physical Properties | |
| Phase | Solid |
| Melting Point | 1941 K (1668 °C, 3034 °F) |
| Boiling Point | 3560 K (3287 °C, 5949 °F) |
| Density (near r.t.) | 4.506 g-cm-3 |
| Liquid density at mp. | 4.11 g-cm-3 |
| Heat capacity at 25 °C | 25.060 J-mol-1-K-1 |
| Heat of fusion | 14.15 KJ-mol-1 |
| Chemical Properties | |
| Phase | Solid |
| Oxidation States | 2, 3, 4 |
| Atomic Radius | 140 pm |
| Electro-negativity | 1.54 (Pauling scale) |
| Crystal Structure | Hexagonal |
| Ionization Energies |
1st: 658.8 KJ/mol 2nd: 1309.8 KJ/mol 3rd: 2652.5 KJ/mol |
| Standard Atomic Weight | 47.867 g/mol |
Some Useful Properties of Titanium
- Titanium is a low-density element.
- It is nonmagnetic and possess good heat-transfer properties.
- It can be vastly strengthened by alloying and deformation processing.
- It shows high degree of immunity to attack by strong acids, minerals, and chlorides.
- Titanium and its alloys have higher melting points than those of steels.
- It is nontoxic and biologically compatible with human bones and tissues.
- It exhibit excellent corrosion resistance.
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