1. Introduce
– A member of the platinum group and a metal with excellent ductility and electrical properties
– It has the lowest melting point (1552℃) and density (12g/㎤) among the platinum group elements and the greatest chemical reactivity
– Does not oxidize at room temperature, but only reacts with oxygen at high temperatures above 800℃ to form palladium oxide
– It absorbs more than 900 times its volume of hydrogen at room temperature and is used in hydrogen storage alloys
→ Pd : Since the activation energy of hydrogen molecule dissociation reaction is low compared to other metals, it has the property of absorbing hydrogen well even under normal temperature and pressure conditions
– Pd alloying element effect: Reduced coefficient of thermal expansion
2. Property
– Ductility and malleability, low temperature strength, biocompatibility, discoloration resistance, corrosion resistance, good hydrogen absorption and storage capacity
[Pd Mechanical Properties]
| Tensile Strength (Mpa) | Elongation (%) |
|---|---|
| 180 | 2 |
[Pd Physical Properties]
| Density (g/㎤) | Melting Range (℃) | Electrical resistivity (µΩ∙㎝) | Specific Heat (J/kg∙℃) | Thermal Conductivity (W/mK) | Coefficient of Thermal Expansion (µm/m°C) |
|---|---|---|---|---|---|
| 12.02 | 1552 | 9.93 | 195~247 | 71.2 | 11.1 |
3. Application
– Catalysts for automobile exhaust, jewelry, dental materials, connectors, switches, relays, electrical contact plating, electrodes, semiconductors, hydrogen storage alloys, electrodes and catalysts for room temperature nuclear fusion, dental crowns and bridges
(1) Catalysts for automobile exhaust / (2) Connectors / (3) Relays / (4) Dental crowns and bridges
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