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Studies on material science of ancient bronze objects : focusing on heat treatment and corrosion

古代青铜器材料学研究：以热处理与腐蚀为重点

基本信息

批准号：
15300294
负责人：
YOKOTA Masaru
金额：
$ 10.5万
依托单位：
University of Toyama (2005-2006)Takaoka National College (2003-2004)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

项目摘要

The obtained results of our studies are as follows.(1) Subject 1 : Research on possible use of heat treatment in bronze-mirror manufacture of ancient timesWe investigated the influence of heat-treatment conditions on the microstructure, hardness and compression strength of a hi-tin bronze. Mechanical properties of the heat-treated specimens did not show much improvement compared to the specimen that are not heat-treated. We concluded that bronze mirrors were not heat-treated after casting in ancient times.We had observed about 20 ancient bronze mirrors by optical microscope and found that some have different micro structure from that of the hi-tin bronze cast in this experiment. We are planning to cast hi-tin bronze under various cooling rate and investigate their microstructure and mechanical properties.(2) Subject 2 : Research on corrosion of ancient bronze mirror found in groundIn an early stage of the study, a DNA analysis found the presence of a strain, which is regarded as Xanthomonadaceae of Bacteroidales. Further DNA analysis by cloning found microorganisms which can be presumed to be Acetobacter and Gluconacetobacter. These analyses have shown high possibility of the presence of multiple microorganisms in corroded layers of ancient bronze mirrors. We are planning to cultivate the microorganisms, which live in unusual environment, but we have not found the appropriate medium for cultivating them. We presume that these microorganisms are causing corrosion in bronze objects. In further research, we hope to prove microbiological corrosion of ancient bronze objects.

我们的研究结果如下。(1)受试者1：热处理工艺在古代铜镜制造中的可能性研究本文研究了热处理工艺对高锡青铜显微组织、硬度和抗压强度的影响。热处理试样的机械性能没有显示出很大的改善相比，没有热处理的试样。通过对20余件古铜镜的光学显微镜观察，发现其中一些铜镜的显微结构与本实验所铸高锡青铜镜的显微结构有所不同。我们计划在不同的冷却速度下铸造高锡青铜，并研究其显微组织和力学性能。(2)受试者2：在研究的早期阶段，DNA分析发现了一种菌株的存在，该菌株被认为是拟杆菌目的黄单胞菌科。通过克隆进一步DNA分析发现微生物，可以推测为醋杆菌属和葡糖酸醋杆菌属。这些分析表明，古铜镜腐蚀层中存在多种微生物的可能性很大。我们正计划培养生活在特殊环境中的微生物，但我们还没有找到合适的培养基。我们推测这些微生物是造成青铜器腐蚀的原因。在进一步的研究中，我们希望能证明古代青铜器的微生物腐蚀。