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    • Ti–Zr coating on graphite through powder immersion reaction-assisted coating (PIRAC) and its oxidation kinetics at $T = 1000^{\circ}$C

      S SUASMORO F A R WATI N MUHAIMIN

      Volume 42 Issue 3 June 2019 Article ID 0126

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/042/03/0126

    • Keywords

       

      Coating; graphite; Ti–Zr alloy; oxidation; diffusional mechanism.

    • Abstract

       

      Coating of graphite with a metal alloy Ti–Zr was carried out on a block of graphite sample; the sample was initially dipped in ZrO$_2$ containing a natural starch solution and then proceeded to powder immersion reaction-assisted coating (PIRAC) after drying. Ti powder containing 4 wt% iodine was used as depositing material, and the process was carried out at 850−950$^{\circ}$C for 10 h. The characterizations include X-ray diffraction, scanning electron microscopy and the hardness test. The coating thickness is proportional to the temperature of the PIRAC process, while the percentage of Zr is inversely proportional to the temperature of PIRAC treatment. All the characterizations revealed that the coated layer was a Ti–Zr alloy with hexagonal crystalline symmetry similar to $\alpha$-Ti. An oxidation kinetic assessment at 1000$^{\circ}$C of uncoated graphite shows a burns-off mechanism, while for a coated sample reveals a reaction of Ti with oxygen produces TiO$_2$; the reaction kinetics obey a diffusional mechanism.

    • Author Affiliations

       

      S SUASMORO1 F A R WATI1 N MUHAIMIN1

      1. Department of Physics, Institute of Technology ‘Sepuluh Nopember’ Surabaya, Kampus ITS Sukolilo, Surabaya 60111, Indonesia

    • Dates

       
      Published
      1 June 2019
      Manuscript received
      1 October 2018
      Accepted
      8 December 2018

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