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熱壓燒結制備La混雜納米復合AgSnO2電接觸合金
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國家自然科學基金(50471033)；陜西省科學技術研究發(fā)展計劃(2007K06-09)；西安市工業(yè)應用技術研發(fā)項目(CXY08001.4)；陜西省教育廳專項科研計劃(07JK259)；大郎研究生創(chuàng)新基金資助


La-Doped Nanocomposite Ag-SnO2 Contacts Prepared by Hot Pressing
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    摘要:

    利用化學共沉淀和熱壓燒結等方法制備出納米復合Ag-SnO2和La摻雜Ag-SnO2觸頭合金，對合金觸頭進行物理性能測試、真空耐電壓和電弧燒蝕實驗，并利用冷場發(fā)射掃描電鏡(FESEM)對電性能實驗前后組織進行分析。結果發(fā)現(xiàn)：納米復合AgSnO2電接觸合金保持了制粉時納米SnO2顆粒的形貌和粒度，尤其是含La摻雜的電接觸材料，其氧化物粒度更細，分布更均勻。隨氧化物粒度的減小，電接觸材料的硬度和電阻率增加、耐電壓強度降低、耐電弧燒蝕速率減小

    Abstract:

    The nanocomposite Ag-SnO2 and La-doped Ag-SnO2 electrical contact alloys are prepared by chemical co-precipitation method and hot pressing and sintering technique. The main physics performances were measured in this paper. The breakdown field strength of contacts alloys were investigated in vacuum and the microstructures are observed by field emission scanning electron microscopy. The results show that the nanosized SnO2 of the same morphology and grain size as the prepared powders，disperses evenly in the Ag based. Especially for the La-doped nanocomposite Ag-SnO2 contact alloys, the oxide grain size is less, and disperses more evenly. With the oxide grain size decreasing, the hardness and electrical resistivity increase, and the breakdown field strength and the arc erosion rate decrease.

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王俊勃,劉 英,付 翀,楊敏鴿,丁秉鈞.熱壓燒結制備La混雜納米復合AgSnO2電接觸合金[J].稀有金屬材料與工程,2009,38(11):2023~2026.[Wang Junbo, Liu Ying, Fu Chong, Yang Minge, Ding Bingjun. La-Doped Nanocomposite Ag-SnO2 Contacts Prepared by Hot Pressing[J]. Rare Metal Materials and Engineering,2009,38(11):2023~2026.]
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  • 收稿日期:2008-10-30
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