Plasma Oxidation of Alloys

合金的等离子体氧化

• 批准号: 62550523
• 负责人: TAKADA Jun
• 金额: $ 1.22万
• 依托单位: OKAYAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550523/
• 关键词: Plasma; Oxidation; Dispersion Strengthening; Copper Alloys; Silver Allovs; アルミナ; 電気抵抗; 内部酸化; 固溶酸素

In order to make clear a possibility and the mechanism of plasma oxidation of alloys, Cu-Al, Ag-Cd and Ag-Al alloys were oxidized by low temperature plasma. For comperison, oxidation behavior of Ag-Al alloys in air by the usual oxidation method was also studied in the temperature range of 400-900 c.In Ag-0.5-4.5at%Al alloys oxidized in air at 400-900 C a marked increase in hardeness due to oxidation was confirmed. This results from dispersion of Al oxide precipitates small in size. In these alloys, two types of oxidation behavior were found : high temperature oxidation and low tempature oxidation. On the high temperature oxidation the electrical resistivity R decreases, while R increases at low temperatures. This is because Al_2O_3 precipitates have an excess amount of oxygen for the low temperature oxidation, and stoichiometric Al_2O_3 particles are formed at hith temperatures.Low temperature plasma was found to be enable to oxidize both Cu and Ag alloys. In adequate conditions of plasma oxidation, only the internal oxidation layer was formed without the formation of an external oxidation layer. The oxidation rate and the hardeness are much higher for plasma oxidation than for the usual gas oxidation.

为了探讨等离子体氧化合金的可能性和机理，对Cu-Al、Ag-Cd和Ag-Al合金进行了低温等离子体氧化。作为对比，还用常规氧化法研究了Ag-Al合金在400-900 ℃空气中的氧化行为，证实了Ag-0.5-4.5at%Al合金在400-900 ℃空气中氧化后硬度显著提高。这是由于尺寸小的Al氧化物沉淀物分散的结果。在这些合金中，发现两种类型的氧化行为：高温氧化和低温氧化。在高温氧化时，电阻率R减小，而在低温下，电阻率R增大。这是因为Al_2O_3沉淀物中含有过量的氧，在高温下形成化学计量比的Al_2O_3颗粒，低温等离子体能氧化Cu和Ag合金。在适当的等离子体氧化条件下，仅形成内氧化层而不形成外氧化层。等离子体氧化的氧化速率和硬度比通常的气体氧化高得多。

项目成果

Jun TAKADA: "Internal Oxidation of Ag-Al Alloys" Metallurgical Transactions.

Jun TAKADA：“银铝合金的内部氧化”冶金学报。

Jun TAKADA.: Oxidation of Metals.

Jun TAKADA.：金属的氧化。

Kenji Yanagihara: "Internal Oxidation of Cu-Al Alloy by Low Temperature Plasma" Proceedings of 5th Plasma Electronics Symposium on Plasma Processing. 167-170 (1988)

Kenji Yanagihara：“低温等离子体对铜铝合金的内部氧化”第五届等离子体电子学等离子体处理研讨会论文集。

Nobuyuki YOSHIDA: Transactions of the Japan Institute of Metals. 29. 693-694 (1988)

Nobuyuki YOSHIDA：日本金属学会汇刊。

Nobuyuki YOSHIDA.: Transactions tye Japan Insitite of Metals. 29. 693-694 (1988)

Nobuyuki YOSHIDA.：交易涉及日本金属协会。