About Tantalum Alloys
Tantalum is a rare, hard, blue-grey, lustrous transition metal that is highly corrosion-resistant. Part of the refractory metals group, it is widely used as a minor alloying component, and is also used to produce a range of alloys prized for high melting points, strength and ductility. Alloyed with other metals, tantalum is used in carbide tools for metalworking equipment and in superalloys for jet engine components, chemical process equipment, nuclear reactors, missile parts, heat exchangers, tanks and vessels. Because of its ductility, tantalum can be drawn into fine wires or filaments used for evaporating metals such as aluminium, and because it resists attack by body fluids and is non-irritating, it is widely used for surgical instruments and implants.
Tantalum is inert against most acids except hydrofluoric acid and hot sulfuric acid; hot alkaline solutions will also cause it to corrode. This makes it a useful metal for chemical reaction vessels and pipes handling corrosive liquids, and heat-exchanging coils for steam heating of hydrochloric acid are commonly made from tantalum. Historically, tantalum was extensively used in ultra-high-frequency electron tubes for radio transmitters — its ability to capture oxygen and nitrogen by forming nitrides and oxides helped sustain the high vacuum needed inside the tubes.
Key Properties & Applications
- Rare, hard, highly corrosion-resistant refractory metal
- Resistant to most acids except hydrofluoric and hot sulfuric acid
- Ductile enough to draw into fine wire and filament
- Biocompatible — widely used in surgical instruments and implants
- Used in jet engines, nuclear reactors, missile parts, heat exchangers and chemical process equipment
Tantalum-Tungsten Alloy Variants
Tantalum-tungsten alloys belong to the refractory metals group, retaining useful physical and chemical properties even at high temperatures. Their performance combines the strengths of both elements: tungsten, which has the highest melting point in the periodic table, and tantalum, prized for its corrosion resistance.
| Variant | Tungsten Content | Trade Name | Characteristics | Example Applications |
|---|---|---|---|---|
| Ta – 2.5% W | ~2–3% W, plus 0.5% Nb | Tantaloy 63 | Good corrosion resistance, performs well at elevated temperatures | Piping in chemical industries |
| Ta – 7.5% W | ~7–8% W | Tantaloy 61 | High resilience modulus while retaining refractory properties | High-stress refractory components |
| Ta – 10% W | ~9–11% W | Tantaloy 60 | Less ductile and less plastic than the other variants | Aerospace components, furnaces, nuclear plant piping |