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Silicon nitride is not a metal. It is a very hard ceramic material, typically used in high-friction environments (such as the ball bearings in a car engine) because the supreme hardness reduces the amount a part flexes, which means less surface contact and therefore less friction.

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15y ago
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1d ago

Car engines are made from low-density metals like aluminum or silicon nitride because these materials are lightweight, which helps improve fuel efficiency and performance. Additionally, these materials have good thermal conductivity, which helps dissipate heat efficiently, reducing the risk of engine overheating.

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Q: Why are car engines made from low density metal like silicon nitride?
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