Functions and Applications of Molybdenum

Melting point of molybdenum(2625°C), boiling point (4600°C), hardness (5.5), and density (10.2 g/cm3), making it a good conductor of electricity and heat.

Molybdenum offers the following performance advantages:

1. The thermal expansion coefficient of molybdenum is very low and similar to that of silicon single crystal; 100°C is 4.53×10-6/°C; 400°C is 5.34×10-6/°C; 700°C is 5.72×10-6/°C,
2. Molybdenum has a high density of 10.2 g/cm3 and high thermal conductivity;
3. Molybdenum has a lower resistivity: 5.17×10-10Ω·cm when 0℃; 24.6×10-10Ω·cm when 800℃; 72×10-10Ω·cm when 2400℃.
4. Molybdenum is a paramagnet and the specific heat of molybdenum is 242 at 25°C. 8J/(kg·K)。
5. The hardness of molybdenum is relatively large, the Mohs hardness is 5~5.5; the Vickers hardness of molybdenum square sheet (HV250-300)

Applications of molybdenum

Molybdenum metal has a wide range of applications in electronic devices such as tubes, transistors and rectifiers

1. Used as grid and anode support material in electron tubes.
2. Molybdenum is used as a metal oxide semiconductor gate in very large integrated circuits, and the “bimetal effect” can be eliminated by mounting the integrated circuit on the molybdenum.
3. Molybdenum discs can also be used as substrates and heat sinks for power transistor heat shields and silicon rectifiers.
4. Molybdenum square is used as power semiconductor thermal compensation sheet and substrate.

Double-sided polished molybdenum substrate (mirror and surface roughness≤0.03μm), applied toLEDlight-emitting chip, replace sapphire as substrate, with better heat dissipation。