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Cr3C2/Ni3Al復(fù)合材料的微觀組織和室溫耐磨性
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TB333

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國家高技術(shù)研究發(fā)展計劃(863計劃)


Microstructure and Room-Temperature Wear-Resistance of Cr3C2/Ni3Al Composites
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    摘要:

    采用藥芯焊絲法制得Ni-Al-Cr3C2復(fù)合焊絲,將該焊絲堆焊于工件表面,在堆焊過程中,利用氬弧物理熱和Ni-Al反應(yīng)熱,Ni與Al化合反應(yīng)生成Ni3Al金屬間化合物,Cr3C2則發(fā)生分解,除少部分[C]與[Cr]固溶于Ni3Al基體中外,大部分反應(yīng)重新析出細小的Cr3C2相,均勻地分布于Ni3Al基體中.室溫磨粒磨損和微動磨損實驗結(jié)果表明,Cr3C2/Ni3Al復(fù)合材料的耐磨性為Stellite12合金的2倍左右,較高的硬度、高的碳化物體積分數(shù)以及碳化物與Ni3Al基體間良好的界面結(jié)合力是Cr3C2/Ni3Al復(fù)合材料耐磨性優(yōu)良的主要原因.

    Abstract:

    Ni-A1l-Cr3C2 welding wire was produced by metal - powder - core technique. When the welding wires were welded on the surface of carbon steel, carbide particles reinforced Ni3Al base composite was formed due to the physical heat of arc and Ni-Al exothermic reaction. Ni reacted with Al to form Ni3Al and Cr3C2 was dissolved during welding. Most of [Cr] and [C] reacted to form small-dispersed Cr3C2 phase except that a few dissolved into Ni3Al matrix, which strengthened the matrix significantly. The room-temperature abrasive wear and fretting wear tests showed that the wear-resistance of Cr3C2/Ni3Al composite is about two times higher than Stellitel2 alloy that is the typical conventional high-temperature wear-resistant materials. The good wear resistance of Cr3C2/Ni3Al composite coating can be attributed to large volume fraction of carbides, high hardness, and good phases interface bond.

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李尚平,駱合力,曹栩,顧國榮,張喜娥,馮滌. Cr3C2/Ni3Al復(fù)合材料的微觀組織和室溫耐磨性[J].稀有金屬材料與工程,2008,37(1):115~118.[Li Shangping, Luo Heli, Cao Xu, Gu Guorong, Zhang Xie, Feng Di. Microstructure and Room-Temperature Wear-Resistance of Cr3C2/Ni3Al Composites[J]. Rare Metal Materials and Engineering,2008,37(1):115~118.]
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  • 收稿日期:2007-01-29
  • 最后修改日期:2007-01-29
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