In Situ Synthesizing of Fe-V（C,N）Composite
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摘要: 采用粉末冶金方法原位合成Fe-V(C,N)复合材料。应用SEM和XRD分析了复合材料显微组织和物相结构。发现在1200℃烧结时,活性的碳、氮原子降低了σ-(Fev)相的稳定性,生成了α-Fe相和均匀分布在基体中的V(C,N)颗粒。氮气的存在抑制了原位合成的V(C,N)颗粒在烧结后期的长大,最终V(C,N)颗粒尺寸在0.5~3μm之间,体积分数超过50%。在重负荷干滑动磨损试验中表现出很高的耐磨性。Abstract: A reinforced iron matrix composite with in situ V(C,N) particulates was synthesized by powder metallurgical technique.The microstructure and phase of the composite were tested with SEM and XRD.It was found that the stability of σ-(FeV) was reduced due to the presence of the activated atoms of carbon and nitrogen,and the σ-Fe consisting of V(C,N) particles well-distributed in the matrix were synthesized at 1200℃under the nitrogen condition.The growing up of in situ V(C,N) particulates were inhibited presumably due to the effect of nitrogen in reducing solubility of the particles in the matrix.The volume fraction of V(C,N) particles was up to 50% with particle sizes in the range 0.5~3μm.The composite possesses great wear-resistance under the condition of dry slipping with a heavy load.
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Key words:
- powder metallurgy /
- in situ synthesize /
- Fe-V(C,N) /
- V(C,N) /
- composite
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