Pure diamond has five times the thermal conductivity of copper, but it is obviously too expensive to use it alone. Therefore, researchers have added diamond micropowder to copper, and the resulting composite can still reach 1.5 times the heat transfer. And it won't be much more expensive.
Another point is that this new material does not swell significantly after being heated, otherwise it cannot be used in electronic equipment.
Of course, it is not easy to stabilize copper and diamond. The researchers' solution was to use a small amount of chromium to form a carbon layer on the diamond surface that would eventually bond stably with the copper. There may be other materials that can play a similar role, but have not yet been discovered.
So far, this copper-diamond composite has only appeared in the show, and there is no actual product. Maybe you can see this new material in your notebook or on your graphics card or CPU cooler.
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