CONSERVATION TREATMENT OF INLAID OBJECT BY PLASMA

在日本古墓发现的许多镶嵌文物上都刻有两把著名的国宝剑。因此，它们为研究历史提供了丰富的数据。近年来，陆续出土了许多碑文器物，其中大部分碑文都是通过除锈等污物成功阅读的，在学术研究上取得了丰硕的成果。然而，传统的去锈层方法存在着字符笔划有失真，造成制造过程数据丢失的风险。用氢等离子体去除嵌体表面的锈层是一种没有这种风险的有效方法。用X射线衍射仪对嵌体表面的锈层进行了分析，发现用氢等离子体和氧等离子体对锈层进行处理，通过观察它们的变化，找出了最佳的处理条件。结果表明：H-…更高的频率：13.56 MHz，高频输出：2kW温度：200kW，进气量：氮气：400ml/ﾟ，氢气：400ml/分钟，Ar：200ml/min。还发现了锈层变得易碎到可以被去除的机理。氢氧化铁和磁铁矿等三价金属的锈层通过与氢等离子体反应而被还原，所产生的锈层体积的变化，加上在压力还原状态下加热的影响，导致了锈层的易碎。用等离子体处理锈层后，用竹签仔细地去除易碎的锈层，同时用体视显微镜观察，就可以揭开镶嵌。这种方法对镶嵌线条没有任何伤害，因此最适合于处理出土文物的镶嵌铭文。经过一系列的实验，该方法已经完全成为一种实用的方法，并已有10多个应用于养护处理的实例。较少

Many of the inlaid artifacts found at ancient tomb in Japan have inscription like a two famous national treasure swords. As such, they supply a wealth of data for studying history. In recent years, a lot of objects with inscriptions have been unearthed one after another, and most of their inscriptions have been successfully read by removing rust and other dirt with rewarding great results in academic research. The conventional method of scraping off rust The layrs, however, has a risk of distorting the strokes of charactrs somewhat and there by losing data of manufacturing processes.Using hydrogen plasma to remove rust layrs from the surfaces of inlay is an effective method free from such a risk.Rust examples taken off inlays were analyzed by X-ray diffraction, and it was found that the rust teratment with hydrogen plasma and oxygen plasma, the rust examples were examined to find out the optimum comditions of treatment through observation of their change. The results were as follows :H … More igh frequency : 13.56MHz,High frequency output : 2kWTemperature : About 200ﾟCInjection amounts of gases :Nitrogen : 400ml/min, Hydrogen : 400ml/min, Argon : 200ml/minThe mechanism of how rust layrs become friable enough to be scrapped off has also been found. Rust of trivalent metal such as iron hydroxide and magnetite is reduced through reaction with hydrogen plasma, and a resultant change in the volume of the rust layrs, coupled with the effect due to heating under a state of pressure redaution, contributes to the friable of the rust layrs.After treating the rust layrs with plasma, it became possible to uncover the inlays by carefully removing the friable layrs of rust with a bamboo stick while observing them with a stereomicroscope. This method is free from any harm to inlaid lines and consequently best-suited for processing the inlaid inscriptions of excavated artifacts. The method has come tobe established fully as a practical method through a series of experiments, and there are already more than 10 actual examples of its application for conservation treatment. Less