2 (體積分數(shù))和 42.5%Nb+42.5%Mo+10.5%ZrB2+4.5% SiC (體積分數(shù))。使用掃描電鏡、能譜儀、X射線衍射法測定了微觀結(jié)構(gòu)和相組成,使用顯微硬度計和液壓式萬能試驗機測定機械性能。實驗觀察到,在鈮鉬固溶體基體上均勻分布著ZrB顆粒。未發(fā)現(xiàn)SiC顆粒。兩種材料最大的抗壓強度與鈮鉬固溶體基體1380.15MPa相比,提高到了1974.17MPa。屈服強度提高到了1664.13MPa,硬度也是鈮鉬固溶體基體的3~5倍。復合材料強度和硬度的提高主要是因為固溶強化機制以及ZrB顆粒與鈮鉬固溶體基體良好的結(jié)合性。"/>

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鋯硼化物增強鈮鉬固溶體基復合材料的制備和性能的實驗研究
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華北電力大學能源動力與機械工程學院,,華北電力大學能源動力與機械工程學院,華北電力大學能源動力與機械工程學院,華北電力大學能源動力與機械工程學院

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TG148

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國家自然科學基金項目(面上項目,重點項目,重大項目)


An experimental study on preparation and properties of Zirconium boride reinforced NbMo-matrix composites
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    用熱壓燒結(jié)法,在30MPa壓力,1600℃,Ar氣氛保護狀態(tài)下,設定兩種保溫時間,燒結(jié)制成了鋯硼化物增強鈮鉬固溶體基復合材料。兩種材料的原始成分分別是 42.5%Nb+42.5%Mo+15%ZrB2 (體積分數(shù))和 42.5%Nb+42.5%Mo+10.5%ZrB2+4.5% SiC (體積分數(shù))。使用掃描電鏡、能譜儀、X射線衍射法測定了微觀結(jié)構(gòu)和相組成,使用顯微硬度計和液壓式萬能試驗機測定機械性能。實驗觀察到,在鈮鉬固溶體基體上均勻分布著ZrB顆粒。未發(fā)現(xiàn)SiC顆粒。兩種材料最大的抗壓強度與鈮鉬固溶體基體1380.15MPa相比,提高到了1974.17MPa。屈服強度提高到了1664.13MPa,硬度也是鈮鉬固溶體基體的3~5倍。復合材料強度和硬度的提高主要是因為固溶強化機制以及ZrB顆粒與鈮鉬固溶體基體良好的結(jié)合性。

    Abstract:

    Zirconium boride reinforced NbMo-matrix composites with a composition of 42.5%Nb+42.5%Mo+15%ZrB2 (Vol.%) and SiC doped with a composition of 42.5%Nb+42.5%Mo+10.5%ZrB2+4.5% SiC (Vol.%) was fabricated by hot-pressing under an uniaxial load of 30 MPa at 1600℃ in Ar atmosphere with two kind of holding time. The microstructure and phase compositions were analyzed by means of scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The mechanical properties were measured by Micro Vickers and hydraulic universal tester. NbMo solid solution was observed with small ZrB particles distributed uniformly in it. No SiC particle was founded. The compressive strength was improved to 1974.17MPa compared to the NbMo solid solution 1380.15MPa. The yield stress was improved to 1664.13MPa and the hardness was 3~5 times higher than NbMo. The increase in strength and hardness of the composites is a consequence of the solid solution strengthening mechanism and the excellent interface bonding between ZrB and Nb-Mo solid solution.

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王琦,劉宗德,胡慧東,高遠,王永田.鋯硼化物增強鈮鉬固溶體基復合材料的制備和性能的實驗研究[J].稀有金屬材料與工程,2017,46(9):2433~2436.[Qi Wang, Zongde Liu, Huidong Hu, Yuan Gao, Yongtian Wang. An experimental study on preparation and properties of Zirconium boride reinforced NbMo-matrix composites[J]. Rare Metal Materials and Engineering,2017,46(9):2433~2436.]
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  • 收稿日期:2016-06-01
  • 最后修改日期:2017-09-10
  • 錄用日期:2017-02-21
  • 在線發(fā)布日期: 2017-11-29
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