A lanthanum borohydride cathode thermionic source is a type of thermionic converter that utilizes lanthanum borohydride as the cathode material.
Thermionic converters are devices that convert heat directly into electricity by exploiting the thermionic emission phenomenon. This phenomenon occurs when a material, known as the cathode, is heated to a high temperature, causing the emission of electrons. These emitted electrons can then be collected and used to generate an electric current.
- The LaB6 parts with high purity are produced by hot-pressing sintering process;
- The LaB6 products are full density which keep very good stability and very long lifetime;
- Cathode electron emitter in vaccuum metalized machines;
- The LaB6 cathode is used in high-tech testing instrument industry, such as electronic microscope, auger spectrometer and so on because of high brightness, long lifetime characteristics.
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Properties of Lanthanum Boride Ceramics |
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Property |
Item |
Data |
Unit |
|
Mechanical Characteristics |
Color |
Violet |
g/cm3 |
|
Density |
4.73 |
MPa |
|
|
Bending Strength |
- |
MPa |
|
|
Compressive strength |
- |
GPa |
|
|
Elastic Modulus |
- |
MPa m1/2 |
|
|
Fracture Toughness |
- |
m |
|
|
Weber Coefficient |
- |
HV 0.5 |
|
|
Vickers Hardness |
2800 |
MPa |
|
|
Thermal Characteristics |
Coefficient of Line Thermal Expansion |
4.9 |
10-6 K-1 |
|
Thermal Conductivity |
- |
W/mK |
|
|
Melting Point |
2,200 |
°C |
|
|
Oxidation Temperature |
600 |
°C |
|
|
Electrical Characteristics |
Volume Resistance at 20°C |
15~27 |
μΩcm |
|
Work Function |
2.66 |
eV |
|
|
Emission Current Density |
29 |
Acm-2 |
|
|
Emission constant |
29 |
A/cm2⋅K2 |
|
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Chemical Characteristics |
Nitric Acid (60%) 90°C |
- |
WT Loss mg/cm2/day |
|
Sulphuric Acid (95%) 95°C |
- |
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Caustic Soda (30%) 80°C |
- |
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