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<p>In the present study, the ceramic-reinforced novel tungsten-iridium alloys have been prepared through powder metallurgy route. W-1wt.% Ir alloys were reinforced with ceramic particles (B<sub>4</sub>C, TiC, HfC, and BN) via mechanical dispersion and compacted by using the cold isostatic press (CIP). Further, to inhibit grain growth a two-step sintering method was utilized to consolidate the developed alloys. Microstructural and morphological characterization was carried out using XRD and SEM techniques, respectively. The results illustrated that CIP and two-step sintering well contributed to enhance the densification and mechanical properties of the developed W-Ir alloys. The cBN-reinforced W-Ir alloys exhibited the highest density (88%) and hardness of 806.5 HV. The wear performance of the W-Ir alloys was also evaluated using pin-on-disk tribometer. Tribological investigations revealed that at load of 30 N, highest friction coefficient value of 0.11 and minimum specific wear rate of 1.64 x 10<sup>− 10</sup> mm<sup>3</sup>/N.m were found in cBN-reinforced W-Ir alloys. The superior mechanical and wear properties of W-Ir alloys make them useful for wear resistance applications.</p>

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Impact of Carbides and BN Addition on the Mechanical and Wear Properties of Pressure-Less-Sintered Novel Tungsten-Iridium Alloys

  • 期刊论文

  • 发表日期：

    2025年3月19日

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  • Zafar Iqbal,
  • Muhammad Zarif,
  • Mahmood Hussain,
  • Abbas Saeed Hakeem,
  • Attaullah Shah,
  • Muhammad Yasir,
  • Syed Mujtaba Ul Hassan,
  • Hafiz Zahid Shafi

摘要

In the present study, the ceramic-reinforced novel tungsten-iridium alloys have been prepared through powder metallurgy route. W-1wt.% Ir alloys were reinforced with ceramic particles (B4C, TiC, HfC, and BN) via mechanical dispersion and compacted by using the cold isostatic press (CIP). Further, to inhibit grain growth a two-step sintering method was utilized to consolidate the developed alloys. Microstructural and morphological characterization was carried out using XRD and SEM techniques, respectively. The results illustrated that CIP and two-step sintering well contributed to enhance the densification and mechanical properties of the developed W-Ir alloys. The cBN-reinforced W-Ir alloys exhibited the highest density (88%) and hardness of 806.5 HV. The wear performance of the W-Ir alloys was also evaluated using pin-on-disk tribometer. Tribological investigations revealed that at load of 30 N, highest friction coefficient value of 0.11 and minimum specific wear rate of 1.64 x 10− 10 mm3/N.m were found in cBN-reinforced W-Ir alloys. The superior mechanical and wear properties of W-Ir alloys make them useful for wear resistance applications.