The mechanism of spontaneous growth of Pb nano-whiskers on the surfaces of brasses
| Project/Area Number |
20510092
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental technology/Environmental materials
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
SUN Zhengming National Institute of Advanced Industrial Science and Technology, サステナブルマテリアル研究部門, 主任研究員 (70344190)
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| Co-Investigator(Kenkyū-buntansha) |
HASHIMOTO Hitoshi 独立行政法人産業技術総合研究所, 東北産学官連携センター, 総括主幹 (70357771)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2009: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2008: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 人間生活環境 / Cu-Zn合金 / 鉛毒性 / 応力 / 再結晶 / 鉛 / ウィスカー / 自然発生 / 環境 / 健康 / 低融点金属 |
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| Research Abstract |
Spontaneous growth of lead whiskers at ambient temperature in various brass alloys were observed on the cut or ground surfaces. Residual stresses were measured on the surfaces but were found irrelevant to the whisker growth from the alloys. The results of thermal analysis demonstrated that while well-defined endothermic peaks, caused by melting of lead, were measured during heating, no well-defined exothermic peak during cooling was observed. This implies the possibility of the existence of supercooled lead in brasses, which is responsible for the spontaneous lead whisker growth. Long term exposure to air at 60℃ did not affect the whisker formation.
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Report
(4 results)
Research Products
(7 results)
