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Ag-Sn-La合金粉末的氧化組織研究
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中央高?；究蒲袠I(yè)務(wù)費專項資金（2012QNZT003）；國家“十一五”科技支撐計劃（2006BAE03B03）；廣東省教育部產(chǎn)學(xué)研結(jié)合項目（2006D90404015）


Oxidation Microstructure of Ag-Sn-La Alloy Powder
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    摘要:

    采用X 射線衍射儀、金相顯微鏡和掃描電鏡，研究了Ag-Sn-La合金粉末的氧化組織。結(jié)果表明：Ag-Sn-La系合金粉末氧化后主要由Ag、SnO2和La2Sn2O7 3種相組成；合金元素含量不同，Ag-Sn-La合金粉末具有不同的氧化動力學(xué)特征、氧化組織和氧化機制。Ag-5.2Sn-3.4La合金粉末的起始氧化溫度為350 ℃，氧化速度較快，元素La和Sn發(fā)生原位氧化，但柱狀晶上La的快速優(yōu)先氧化使得合金內(nèi)部出現(xiàn)條狀的氧化物；Ag-6.87Sn-1.28La合金粉末從加熱一開始便發(fā)生緩慢氧化，在300 ℃以后開始快速氧化，元素La和Sn發(fā)生原位氧化，原位生成的氧化物顆粒彌散分布在銀基體上；Ag-9.26Sn-0.44La合金粉末的起始氧化溫度為567 ℃且氧化速度較慢，元素La發(fā)生原位氧化，而部分Sn在濃度梯度的驅(qū)動下向外擴散，生成的氧化錫顆粒主要分布在粉末邊界，而La的氧化物則彌散分布在銀基體上。

    Abstract:

    The microstructure of Ag-Sn-La alloy powder after oxidation was investigated by XRD, OM and SEM. The results show that Ag, SnO2 and La2Sn2O7 phases are formed in Ag-Sn-La alloy powder after oxidation. Ag-Sn-La alloy powder has different oxidation kinetic characters, oxidation microstructures and oxidation mechanisms due to the different contents of alloying agent. The starting oxidation temperature of Ag-5.2Sn-3.4La alloy powder is 350 oC and the oxidation velocity is fast. Both element Sn and La are oxidized in situ and strip oxides are formed due to the fast oxidation of element La during the oxidation of Ag-5.2Sn-3.4La alloy powder. The oxidation velocity of Ag-6.87Sn-1.28La alloy powder is slow when the temperature is from room temperature to 300 oC and that is fast when the temperature is above 300 oC. Both element Sn and La are oxidized in situ and the formed oxides are uniformly distributed in the silver matrix. The starting oxidation temperature of Ag-9.26Sn-0.44La alloy powder is 567 oC and the oxidation velocity is slow. Element La is oxidized in situ and element Sn diffuses from the inner to the surface due to the driving of concentration gradient. La oxides are uniformly distributed in the silver matrix and Sn oxides are mainly distributed on the grain boundary after Ag-9.26Sn-0.44La alloy powder oxidation.

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吳春萍,易丹青,許燦輝,周孑民,甕 桅. Ag-Sn-La合金粉末的氧化組織研究[J].稀有金屬材料與工程,2013,42(6):1310~1315.[Wu Chunping, Yi Danqing, Xu Canhui, Zhou Jiemin, Weng Wei. Oxidation Microstructure of Ag-Sn-La Alloy Powder[J]. Rare Metal Materials and Engineering,2013,42(6):1310~1315.]
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  • 收稿日期:2012-06-28
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