Study on solid lubricant properties of carbon onions produced by heat treatment of diamond clusters or particles
Study on solid lubricant properties of carbon onions produced by heat treatment of diamond clusters or particles
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DOI：
10.1016/j.triboint.2004.07.006
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发表时间：
2004-11-01
影响因子：
6.2
通讯作者：
Kaito, T
中科院分区：
文献类型：
--
作者：
Hirata, A;Igarashi, M;Kaito, T
研究了金刚石团簇或颗粒热处理制备的碳洋葱的摩擦学性能。用红外辐射炉在大气压下在氩气中将用作源材料的金刚石簇加热至1730 ℃。在1730 ℃加热1分钟后，金刚石簇转化为碳洋葱。高分辨透射电镜观察证实了碳洋葱的形成，具有近球形和多层同心结构。这些碳洋葱的粒度范围为5至10 nm，对应于金刚石簇的原始尺寸。这种制备技术也适用于直径小于0.5 μ m的金刚石颗粒，以产生更大的碳洋葱。碳洋葱的摩擦学性能进行了检查，通过球-盘型摩擦测试，使用硅片和钢球。碳洋葱，这是蔓延在硅片上没有粘合剂，表现出稳定的摩擦系数低于0.1，在空气中和真空中在室温下。钢球在碳洋葱分布的硅片上滑动的磨损率远低于在石墨粉分布的硅片上滑动的磨损率。此外，发现由金刚石颗粒制备的较大的碳洋葱在粗糙的硅片表面上表现出低摩擦性能。(C)2004爱思唯尔有限公司保留所有权利。
Tribological properties of carbon onions prepared by heat treatment of diamond clusters or particles are presented. Diamond clusters used as the source material are heated with an infrared radiation furnace to 1730 degreesC in argon at atmospheric pressure. As a result of heating at 1730 degreesC for 1 min, diamond clusters are transformed into carbon onions. High resolution TEM observation is employed to confirm the formation of carbon onions that have near-spherical and multi-layered concentric structure. The particle size of these carbon onions ranges from 5 to 10 nm that corresponds to the original size of the diamond clusters. This preparation technique is also applied to diamond particles less than 0.5 mum in diameter to produce larger carbon onions. Tribological properties of the carbon onions are examined by ball-on-disc type friction testing using a silicon wafer and a steel ball. Carbon onions, which are spread on the silicon wafer without adhesive, exhibit stable friction coefficients lower than 0.1 both in air and in vacuum at room temperature. The wear rates of steel balls sliding on the silicon wafer on which carbon onions are distributed are much lower than wear rates for sliding on a wafer over which graphite powder is spread. Moreover, it is found that the larger carbon onions prepared from diamond particles show low friction property on the rough surface of silicon discs. (C) 2004 Elsevier Ltd. All rights reserved.