Researches on the Materials Science for the Ancient Bronze Mirrors focused on the Heat Treatment.

古代铜镜的材料科学研究主要集中在热处理方面。

基本信息

批准号：
12480029
负责人：
YOKOTA Masaru
金额：
$ 8.32万
依托单位：
Takaoka National College
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12480029/
关键词：
Cultural Metal Assets Science of Cultural Properties Ancient Bronze Mirror Materials Science Heat Treatment Mechanical Properties Corrosion in Clay Microbially Influenced Corrosion (MIC)金属製文化財青銅器材料工学金相学腐食生成物古代青銅器純Cu析出

项目摘要

We carried out researches into the heat treatment technique to ancient bronze mirrors for the aim at improvement of toughness, farther, corrosion of ancient bronze mirrors in clay. We obtained the following principal results.1. Toughness of the home made high tin bronze alloy was improved remarkably when, for example, water quenching from 720℃ of solution treatment and 20 minutes holding was performed.2. The rates of density reduction obtained from the measured and the calculated densities corresponded to the degree of corrosion of the mirrors.3. The shapes of appearances of pure copper lumps in the mirrors show various modes, i.e., depositions like layers, large or fine particles, or depositions like string or flash of lightning just burring the cracks in the mirrors.4. The oxide copper (Cu_2O) layers and particles were observed in the mirrors showing just the same shapes as those of pure copper depositions.5. Amorphous SiO_2 had formed in the outermost corroded layer.6. Cu_2O (cuprite) and Cu (OH)_2 had formed in the middle layer of corrosion, which comprise the first two internal layers adjacent to the layer.7. Cu-Sn-Pb-complex oxide had formed in the middle layer corrosion, the next internal layer. Small amounts of PbSO_4 and an Sn-organic compound were also detected. We observed that Cu_2S (chalcocite) forms like mold on the polished surface of the corroded layers, especially notable on layer IV, after being mechanically polished and left to stand for about one month. Cu_2S is presumed to be the resultant of sulfate reducing bacteria.8. Numerous pure copper lumps appeared in layers or particles and tended to form in the vicinity of the middle corrosion layer.9. The evidence from these analyses suggests that microorganisms could have been the cause of the corrosion found in ancient bronze mirrors excavated from clay.

我们对古代青铜镜进行热处理技术进行了研究，目的是改善韧性，更远的粘土中古代青铜镜的腐蚀。我们获得了以下主要结果。1。例如，当从720°溶液处理和20分钟的固定中进行水淬火时，家用制成的高锡青铜合金得到了明显改善。2。从测得的和计算的密度获得的密度降低速率对应于镜子的腐蚀程度3。镜子中纯铜灯的外观形状显示出各种模式，即，诸如层，大或细颗粒等沉积，或闪电的丝状或闪电的闪光等沉积，只是埋在镜子中的裂缝。4。在镜子中观察到氧化铜（Cu_2O）层和颗粒，显示与纯铜沉积的形状相同的形状。5。无定形SIO_2在最外层腐蚀层中形成6。 Cu_2O（库）和Cu（OH）_2在腐蚀的中间层中形成，其中包括与该层相邻的前两个内部层。7。 Cu-Sn-Pb复合物氧化物在中间层腐蚀中形成了下一个内部层。还检测到少量的PBSO_4和SN和有机化合物。我们观察到腐蚀层的抛光表面上的cu_2s（chalcocit）形式（例如霉菌）在机械抛光后，尤其是在IV层上值得注意的表面，并保持了大约一个月的时间。 Cu_2s表示为硫酸盐还原细菌的产生。8。许多纯铜灯以层或颗粒的形式出现，并在中间腐蚀层附近形成。9。这些分析的证据表明，微生物可能是在古老的青铜镜中发现的腐蚀的原因。