TiN-TiAl複合体の機械的特性

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  • TiN TiAl フクゴウタイ ノ キカイテキ トクセイ
  • Mechanical Properties of TiN-TiAl Composites

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TiN-TiAl ceramics/intermetallic composites containing no additives were hot-pressed from a mixture of TiN, Ti and Al powders containing 5 up to 100massl%TiAl (5, 20, 40, 60, 80, 100mass%TiAl), which were formed from a reaction between Ti and Al. Hot-pressing was conducted at 1000℃ for 7.2 ks under a pressure of 13.9 MPa in an Ar gas atmosphere. The mechanical and electrical properties were examined as a function of compositional change from 5 to 100mass%TiAl. TiN-TiAl composites containing 60～100mass%TiAl had a relative density of 67.3～71.1%, bulk density of 2380～2830kg m^<-3>, Vickers hardness of 506～2771MPa, flexural strength of 50～123MPa, Young's modulus of 45.9～82.4GPa, and electrical conductivity of 606～778k S・m^<-1>. The sufficient densification was not necessarily performed because the reaction from Ti and Al to TiAl phase was not completed by the use of coase Ti and Al powders.

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