Achemetal Tungsten & Molybdenum Co., Ltd.
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Tungsten Copper Heat Sink For Maching Tungsten Alloy
A heat sink is a component that increases the heat flow away from a hot device. It accomplishes this task by increasing the device's working surface area and the amount of low-temperature fluid that moves across its enlarged surface area. Based on each device's configuration, we find a multitude of heat sink aesthetics, design, and ultimate capabilities. You can see a straight fin heat sink in the image at the top of this article and a flared fin heat sink in the image below. Each heat sink is valuable in applications that may have varying.
Heat sink Sheet is a composite made from Mo and Cu. Similar to W-Cu, CTE of Mo-Cu can also be tailored by adjusting the composition. But Mo-Cu is much lighter than W-Cu, so that it is more suitable for aeronautic and astronautic applications.
CuW55 have the lowest Tungsten contents. They are both good switching and contact materials for oil filled devices. CuW55 heat sink is also used for arcing contacts in oil circuit breakers and arcing edges of selectors and switchblades in transformer tap changers.
CuW65 and CuW70 are used as contact materials in severe arcing applications including gas, oil and some air circuit breakers. They are also used for arcing edges on selectors and reversing switch blades.
CuW75 and CuW80 are used as contact materials under extreme arcing conditions. Applications include arcing contacts in gas and oil circuit breakers, contactors and transformer tap changers, arcing plates and arc runners in power switching equipment.
CuW85 and CuW90 have the highest Tungsten content. They are used as contact materials where resistance to contact welding, sticking and arc erosion are critical.
They also provide satisfactory heat and current interruption capabilities. Typical applications are power vacuum switches and high power spark gap electrodes, etc..
Heat sink
| Type | Composition | Properties | ||||
| element | Content wt% | Density | CTE ppm/K | TC, W/m·K | ||
| Mass density, g/cm3 | Relative density, %T.D | |||||
| Mo70Cu30 | Mo Cu | 70±1 balance | 9.7 | ≥99 | 7.6~8.5 | 190~200 |
| Mo60Cu40 | Mo Cu | 60±1 balance | 9.6 | ≥99 | 9.2~9.4 | 200~220 |
| Mo50Cu50 | Mo Cu | 50±1 balance | 9.5 | ≥99 | 10.2~10.5 | 220~250 |
| Features of tungsten copper heat sink:
High thermal conductivity due to no sintering additives were used Excellent hermeticity Relatively small density Stampable sheets available (Mo content not more than 75wt.%) Semi-finished or finished (Ni/Au plated) parts available
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