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Effect of TiB2 Particle Size on Erosion Behavior of Ag-4wt% TiB2 Composite
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Effect of TiB2 Particle Size on Erosion Behavior of Ag-4wt% TiB2 Composite
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National Natural Science Foundation of China (51274163); Shaanxi Province Key Laboratory Project (13JS076); the China Scholarship Council and Shaanxi Provincial Project of Special Foundation of Key Disciplines (2011HBS2S009)

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    摘要:

    為了研究不同粒度TiB2對Ag-TiB2復(fù)合材料電弧侵蝕行為的影響，通過機(jī)械球磨和粉末冶金的方法制備不同粒度的TiB2增強(qiáng)Ag-4%TiB2(質(zhì)量分?jǐn)?shù))復(fù)合材料。對Ag-4%TiB2復(fù)合材料的組織進(jìn)行了分析，定量分析了TiB2的分布。用TDR240A單晶爐改裝的設(shè)備進(jìn)行真空電弧侵蝕實驗，采用掃描電子顯微鏡(SEM)表征了電弧侵蝕后試樣表面形貌，測量了電弧侵蝕前后的質(zhì)量損失，采用TDS-2014雙通道數(shù)字示波器記錄了每次電弧的持續(xù)時間，并且對電弧侵蝕機(jī)理進(jìn)行了討論。結(jié)果顯示，隨著TiB2顆粒粒度的減小，TiB2顆粒在Ag基體分布更均勻，Ag-4%TiB2觸頭材料表現(xiàn)出小的質(zhì)量損失，短的電弧持續(xù)時間，大的侵蝕區(qū)域以及淺的侵蝕坑。說明了細(xì)小TiB2顆粒更能有效改善Ag-4%TiB2觸頭材料的耐電弧侵蝕性能。

    Abstract:

    In order to clarify the effect of TiB2 particle size on the arc erosion behavior of Ag-TiB2 composite, Ag-4wt%TiB2 composite reinforced by different grain-sized TiB2 particles was prepared by mechanical milling and powder metallurgy. The microstructures of Ag-4wt%TiB2 composites were analyzed, and the global distribution of TiB2 particles was quantitatively evaluated by the enumeration method. The vacuum arc erosion of Ag-4wt%TiB2 composite was tested in a modified TDR240A single crystal furnace. The surface morphology of the Ag-4wt%TiB2 composite after arc erosion was characterized. The mass losses before and after arc erosion were measured. The arc duration was determined by the discharged waveform recorded by a Tektronix TDS-2014 dual channel digital memory oscilloscope, and the arc erosion mechanism was discussed as well. The results show that with the decrease of TiB2 particle size, the TiB2 particles are more uniformly dispersed in the Ag matrix, and Ag-4wt%TiB2 composite presents less mass loss, shorter arc duration, larger arc erosion area and shallower erosion pits. It suggests that fine TiB2 particle can effectively improve the arc erosion resistance of the Ag-4wt%TiB2 composite.

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王獻(xiàn)輝,楊 浩,梁淑華,劉馬寶,劉啟達(dá). Effect of TiB2 Particle Size on Erosion Behavior of Ag-4wt% TiB2 Composite[J].稀有金屬材料與工程,2015,44(11):2612~2617.[Wang Xianhui, Yang Hao, Liang Shuhua, Liu Mabao, Liu Qida. Effect of TiB2 Particle Size on Erosion Behavior of Ag-4wt% TiB2 Composite[J]. Rare Metal Materials and Engineering,2015,44(11):2612~2617.]
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  • 收稿日期:2014-11-21
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  • 在線發(fā)布日期: 2016-07-29
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