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Physico-Mechanical Properties and Structual Features of an Al–α–Al2O3 Cermet Obtained Using Corundum Microspheres by Sintering in Vacuum

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Refractories and Industrial Ceramics Aims and scope

A cermet of the Al-α-Al2O3 composition (90 vol.%) was prepared using hollow corundum microspheres (HCM) of a narrow fraction of 40 – 70 μm, which were obtained by plasma spheroidization, and PAP-2 aluminum powder. During liquid-phase sintering of the starting powder materials, adhesive bonding was created along the boundary between HCM and PAP-2 as a result of crystallization of the Al–Al4C3 eutectic melt. The resulting cermet demonstrates the following characteristics: density 2.67 – 2.89 g/cm3, open porosity 19 – 11%, bending strength 47 – 70 MPa, compression strength 100 – 150 MPa, Vickers microhardness 1550 – 1960 MPa, impact bending strength 3.53 × 103 – 4.27 × 103 J/m2, and fracture toughness 1.7 – 2.9 MPa·m1/2. The developed material can be recommended as an abrasive tool for smoothing the surface of metal and metal alloy parts during their finishing treatment.

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Authors and Affiliations

  1. Moscow Aviation Institute, Moscow, Russia

    D. A. Ivanov & L. V. Fedorova

  2. Kit-Stroy Ltd., Saint Petersburg, Russia

    D. A. Tarasov & M. N. Kudryash

Authors
  1. D. A. Ivanov
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  2. D. A. Tarasov
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  3. M. N. Kudryash
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  4. L. V. Fedorova
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Correspondence to D. A. Ivanov.

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Translated from Novye Ogneupory, No. 4, pp. 20 – 26, April, 2022.

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Ivanov, D.A., Tarasov, D.A., Kudryash, M.N. et al. Physico-Mechanical Properties and Structual Features of an Al–α–Al2O3 Cermet Obtained Using Corundum Microspheres by Sintering in Vacuum. Refract Ind Ceram 63, 209–214 (2022). https://doi.org/10.1007/s11148-022-00708-7

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  • DOI: https://doi.org/10.1007/s11148-022-00708-7

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