Ni-Cr合金真空钎焊金刚石的表面石墨化
Surface graphitization on brazed diamond with Ni-Cr alloy in vacuum brazing
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摘要: 以Ni-Cr合金为钎料采用真空钎焊的方法制备了金刚石钎焊试样.运用扫描电镜(SEM)、X射线能谱仪(EDS)及显微激光拉曼光谱仪对钎焊金刚石表面石墨化的形貌、石墨化程度进行了综合分析.结果表明,在Ni-Cr合金钎料真空钎焊金刚石的过程中,金刚石的表面生成了石墨,其厚度约为10μm;而钎焊过程中,金刚石表面C原子结构的破坏、解体以及降温过程中C原子的析出和再结晶是导致金刚石石墨化的原因;钎焊时在金刚石表面先生成石墨后生成碳化物.Abstract: The brazed diamond samples with Ni-Cr filler alloy were prepared by vacuum brazing method.The microstructure of graphite and the degree of graphite on diamond surface were analyzed by scanning electron microscope(SEM), energy dispersion spectrometer(EDS) and laser Raman spectroscopy.The results show that graphite grows on the surface of the diamond during vacuum brazing, diamond with Ni-Cr filler alloy and its thickness is about 10 μm.The reason of graphitization on brazed diamond surface is that there is degradation of atomic carbon on diamond surface in the molten Ni-Cr filler alloy during brazing, and there are precipitation and recrystallization of atomic carbon from the Ni-Cr filler alloy.The formation of graphite is earlier than the formation of carbide during vacuum brazing.
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Keywords:
- Ni-Cr alloy /
- vacuum brazing /
- diamond /
- graphitization
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