The thermal expansion coefficient of tungsten carbide needles is relatively small, about 5.4×10^-6/°C, which means that when the temperature changes, the size change of tungsten carbide needles is also relatively small. This characteristic makes tungsten carbide needles very useful when working in high temperature environments because it is able to maintain its shape and dimensional stability at high temperatures without losing accuracy due to temperature changes. At the same time, due to the small thermal expansion coefficient of tungsten carbide needles, it is often used to manufacture measuring tools and instruments that require high precision, such as calipers, calipers, mirrors, etc.
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