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Micro Machining by an Element Selective Corrosion Action of Thiobacillus Genus Bacterium

硫杆菌属细菌的元素选择性腐蚀作用的微加工

基本信息

批准号：
11650732
负责人：
KAMIYA Osamu
金额：
$ 2.3万
依托单位：
Akita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

The possibility of metal processing by a bacterium was studied in this research. Paying attention to iron oxidation bacteria called Thiobacillus-ferrooxidans (TFO) it examined about micro processing of iron and steel. At the first, TFO of the various kinds that it gathered from a mine waste fluid were used. Next, the pure bacteria that were analyzed on gene were used. It understood that ferrite is processed preferentially mainly a microstructure of ferrite-pearlite steel dipping in TFO with the sulfuric acid culture medium (9K type) of PH2. Pearlite i s composed of a laminar structure of fine ferrite and cementite. The cementite mainly remains without being processed. In other words, micro solids structure that is composed of bone unit structure of cementite able to be formed. Hyper-eutectic steel was done the dipping test to inspect the remaining of cementite furthermore. As a result, processing speed of raw bacteria becomes over 8 times of unbacteria case and understood that also cementite remained obviously in the case of live bacteria. TFO is getting active by utilizing energy that occurs when iron ions of 2 values oxidized in 3 values. An iron ion of 3 values hardly exists on unbacteria field, although strong oxidation nature is shown. A ferrite was easily processed by iron ions of 3 values with TFO, cementite was difficult to process because it was compound between iron and carbon. The possibility of metal structural selective micro machining of TFO was inspected.

本研究研究了细菌加工金属的可能性。它关注于称为氧化亚铁硫杆菌（TFO）的铁氧化细菌，研究了钢铁的微加工。最初，使用从矿井废液中收集的各种 TFO。接下来，使用进行基因分析的纯细菌。据了解，铁素体优先加工主要是铁素体-珠光体钢在PH2的硫酸培养基（9K型）中浸入TFO中的显微组织。珠光体由细小的铁素体和渗碳体的层状结构组成。渗碳体主要是未经加工而残留的。换句话说，能够形成由渗碳体的骨单元结构组成的微固体结构。对过共晶钢进行浸渍试验，进一步检查渗碳体的残留情况。其结果是，生菌的处理速度是无菌情况的8倍以上，可知在活菌的情况下渗碳体也明显残留。 TFO利用2价铁离子氧化成3价时产生的能量而变得活跃。 3值的铁离子虽然表现出强氧化性，但在非细菌场中几乎不存在。铁素体很容易被3价铁离子用TFO加工，而渗碳体则很难加工，因为它是铁和碳之间的化合物。考察了TFO金属结构选择性微加工的可能性。