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Coating TiAl film on the surface of diamond by self-propagation high temperature reaction

MU Yun-cha

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Abstract

TiAl bonded diamond composites were fabricated by self-propagation high-temperature reaction from Ti / Al / Diamond powders. Effects of different raw materials ratio and ignited temperature on bonding status between diamond and binders were studied. The samples were analyzed by XRD,SEM with EDS. The result showed that SHS reaction occurred if igniting at 700 ℃. TiAl phases were obtained by SHS. Meanwhile, the coating was formed on the surface of diamond. When the mass fraction of diamond was around 25 % with n( Ti) ∶ n( Al) = 3∶ 1,the coating was denser with the TiAl phase better developed.

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What this paper is about

TiAl bonded diamond composites were fabricated by self-propagation high-temperature reaction from Ti / Al / Diamond powders. Effects of different raw materials ratio and ignited temperature on bonding status between diamond and binders were studied. The samples were analyzed by XRD,SEM with EDS. The result showed that SHS reaction occurred if igniting at 700 ℃. TiAl phases were obtained by SHS. Meanwhile, the coating was formed on the surface of diamond. When the mass fraction of diamond was around 25 % with n( Ti) ∶ n( Al) = 3∶ 1,the coating was denser with the TiAl phase better developed.

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Available abstract

TiAl bonded diamond composites were fabricated by self-propagation high-temperature reaction from Ti / Al / Diamond powders. Effects of different raw materials ratio and ignited temperature on bonding status between diamond and binders were studied. The samples were analyzed by XRD,SEM with EDS. The result showed that SHS reaction occurred if igniting at 700 ℃. TiAl phases were obtained by SHS. Meanwhile, the coating was formed on the surface of diamond. When the mass fraction of diamond was around 25 % with n( Ti) ∶ n( Al) = 3∶ 1,the coating was denser with the TiAl phase better developed.

Key concepts: Materials science, Diamond, Coating, Mass fraction, Composite material, Self-propagating high-temperature synthesis, Phase (matter), Diamond cubic

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