论文部分内容阅读
用 CVD方法在钨丝和碳纤维上沉积金刚石薄膜。约含有 10000根纤维的纤维束经特殊 处理后分离为单根。生长条件使碳纤维中心在 CVD生长结束后仍保持固态。 CVD金刚石在纤 维上生长的平均激活能为 93.15 kJ/mol。 SEM照片给出了纤维涂层在不同生长条件下的表面和 中心的形貌。纤维内部的石墨碳和外部的金刚石层有很大的不同。钨丝的断裂强度和杨氏模量 的测量表明，具有金刚石涂层的钨丝的断裂强度为 0.567 GPa， 非常接近不具有金刚石涂层的钨 丝的断裂强度。但具有金刚石涂层的钨丝的断裂应变为 4.8％， 比没有金刚石涂层的钨丝的断 裂应变 7％要小得多。这表明了金刚石涂层可以减少钨丝的断裂应力，提高其机械性能。
Diamond films were deposited on tungsten and carbon fibers by the CVD method. About 10,000 fibers containing fiber bundles after special treatment into a single root. The growth conditions keep the carbon fiber center solid after the CVD growth has ended. The average activation energy of CVD diamond grown on the fibers was 93.15 kJ / mol. SEM photographs show the topography and center morphology of fiber coatings under different growth conditions. Graphite carbon inside the fiber and the outer diamond layer is very different. Measurement of the rupture strength and Young’s modulus of the tungsten wire showed that the breaking strength of tungsten with diamond coating was 0.567 GPa, very close to the breaking strength of tungsten without diamond coating. However, the fracture strain of tungsten with diamond coating was 4.8%, which was much smaller than the fracture strain of 7% of tungsten without diamond coating. This shows that the diamond coating can reduce the fracture stress of tungsten wire to improve its mechanical properties.