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The drill motor, or hammer, is the powerhouse of the rock drill. It generates the force needed to drive the bit into the rock. In percussive drilling, this force combines rotary motion with a pulsating action, enhancing the drilling efficiency In percussive drilling, this force combines rotary motion with a pulsating action, enhancing the drilling efficiency In percussive drilling, this force combines rotary motion with a pulsating action, enhancing the drilling efficiency In percussive drilling, this force combines rotary motion with a pulsating action, enhancing the drilling efficiencyrock drill parts.

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In recent decades, carbon aerogels have been widely explored by using graphitic carbons and soft carbons, which show advantages in superelasticity. These elastic aerogels usually have delicate microstructures with good fatigue resistance but ultralow strength. Hard carbons show great advantages in mechanical strength and structural stability due to the sp3 C-induced turbostratic “house-of-cards” structure. However, the stiffness and fragility clearly get in the way of achieving superelasticity with hard carbons. Up to now, it is still a challenge to fabricate superelastic hard carbon-based aerogels.

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