TiC–30 wt % Fe Composite by Pressure-Assisted Electrothermal Explosion

V.T. Telepa, V.A. Shcherbakov, A.V. Shcherbakov

Abstract

Explored was the possibility for fabrication of net-shape refractory TiC-based cermet items by using the technique of forced electrothermal explosion (ETE). The items of high-melting ceramics are difficult to prepare by conventional powder metallurgy. Since in the ETE process we can attain temperatures as high as 3500 K, this technique seems rather promising for the purpose. In our conditions, the Ti melting point (3054 K) could be reached when the ETE process was carried out under pressure (up to 50 MPa). In this case, the synthesis of ceramic item and its densification (hot pressing) can be carried out in a one-stage process. Pressure-assisted electrothermal explosion in Ti–C–Fe blends (T ≈ 3500 K) was used to fabricate TiC–30 wt % Fe composite (ρ = 5.15 g/cm3, HV 19.4 GPa). At the heating rate w = 150 deg/s (j = 14 МА/m2), the reaction time was 7-10 s. In our mold, SHS reactions can be carried out under the following condition: Т ≈ 3500 K, P = 50 MPa, and w = 150 deg/s. According to XRD and SEM data, the combustion product represented a TiC–30 wt Fe composite, with Fe acting as a binder. Our method can be recommended for production of ceramic items with desired configuration in a one-stage technological process.

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