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原位合成Cr2Nb/CuCr復(fù)合材料及其真空電特性
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國家自然科學(xué)基金（50834003，51174161）；陜西省自然科學(xué)基金（2010GZ007）；陜西省重點(diǎn)學(xué)科建設(shè)專項(xiàng)資金


In-Situ Synthesis and the Vacuum Electrical Performances of Cr2Nb/CuCr Composite
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    摘要:

    采用真空燒結(jié)熔滲法制備不同Cr2Nb含量的Cr2Nb/CuCr復(fù)合材料。通過XRD和SEM研究復(fù)合材料的組織結(jié)構(gòu)，采用SEM和高速攝影研究原位合成的Cr2Nb對(duì)復(fù)合材料表面電弧運(yùn)動(dòng)及表面燒蝕形貌的影響。結(jié)果表明：隨著Cr-Nb復(fù)合粉末添加量的增加，Cr2Nb/CuCr復(fù)合材料的硬度、電導(dǎo)率、截流值、電弧壽命和耐電壓強(qiáng)度均有明顯改善，當(dāng)Cr-Nb復(fù)合粉末的添加量為7%（質(zhì)量分?jǐn)?shù)）時(shí)，Cr2Nb/CuCr復(fù)合材料的陰極斑點(diǎn)更為分散，截流值顯著降低，電弧壽命明顯延長。與常規(guī)CuCr合金性能相比，Cr2Nb/CuCr復(fù)合材料表現(xiàn)出較好的綜合性能。

    Abstract:

    The Cr2Nb/CuCr composites with different Cr2Nb contents were prepared by the vacuum sintering and infiltration method. The microstructure of the composites was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), and the effects of in-situ synthesized Cr2Nb on the surface arc motion and erosion morphology of the composites were studied by high speed photography and scanning electron microscope (SEM). The results show that the addition of Cr-Nb composite powder causes a significant improvement in the hardness, conductivity, chopping current, arcing life and breakdown strength. The addition of 7wt% Cr-Nb composite powder can make the cathode spots of the Cr2Nb/CuCr composite distribute more dispersively, decrease the chopping current and prolong the arcing life obviously. In comparison with conventional CuCr alloys, the Cr2Nb/CuCr composites present better overall performance.

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肖 鵬,尤 君,鄒軍濤.原位合成Cr2Nb/CuCr復(fù)合材料及其真空電特性[J].稀有金屬材料與工程,2012,41(9):1666~1671.[Xiao Peng, You Jun, Zou Juntao. In-Situ Synthesis and the Vacuum Electrical Performances of Cr2Nb/CuCr Composite[J]. Rare Metal Materials and Engineering,2012,41(9):1666~1671.]
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  • 收稿日期:2011-09-10
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