| 摘要 |
<p>A hollow carbon microcoil with the coil pitch of substantially zero, and a hollow ceramic microcoil or a hollow ceramic microfiber prepared by subjecting the hollow carbon microcoil to metallization or other treatments. The hollow carbon microcoil with the coil very densely and orderly wound is characterized by being prepared by strictly regulating reaction conditions in the synthesis of carbon in a microcoil form by catalytically activated thermal decomposition of acetylene and allowing a substrate to descend as the fiber grows. A high-temperature reaction/diffusion treatment of the above hollow carbon microcoil as a starting material in a gas containing various metal components, silicon, boron, carbon, nitrogen and/or oxygen atoms at 800 to 1700 °C results in the formation of the hollow ceramic microcoil or microfiber wherein carbon has been reacted or substituted with the starting gas component while completely retaining the hollow of the axis of the fiber.</p> |
