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金刚石镀层通过活化气相分离,即化学气相沉积法制造。此法在许多领域,如硬质合金涂膜和其它高值涂膜中已广泛应用,并具有相当技术水准。沉积纯碳的方法基于含碳气体,如甲烷、丙酮和一氧化碳的热解作用。在金刚石存在范围的亚稳态区,即低压和低温时,上述热解反应除形成石墨外,生成金刚石的几率有限,因为石墨和金刚石的自由生成在室温时只差0.6kcal/mol。为了得到纯金刚石镀层,必须阻止石墨的生成。可以通过增加反应步骤达到这点,在这些反应中使原子态氢或氧只腐蚀石墨碳相而不
Diamond coatings are produced by activated gas phase separation, chemical vapor deposition. This method has been widely used in many fields, such as cemented carbide coating and other high-value coating, and has a considerable technical level. The method of depositing pure carbon is based on the pyrolysis of carbonaceous gases such as methane, acetone and carbon monoxide. In the metastable region where diamond is present, ie, low pressure and low temperature, the above pyrolysis reaction has a limited chance of forming diamond except for graphite, since the free formation of graphite and diamond is only 0.6 kcal / mol at room temperature. In order to obtain a pure diamond coating, it is necessary to prevent the formation of graphite. This can be achieved by adding reaction steps in which the atomic hydrogen or oxygen only corrodes the graphitic carbon phase