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Materials Research

versão impressa ISSN 1516-1439versão On-line ISSN 1980-5373

Resumo

GHASALI, Ehsan; YAZDANI-RAD, Rahim; RAHBARI, Ali  e  EBADZADEH, Touradj. Microwave Sintering of Aluminum-ZrB2 Composite: Focusing on Microstructure and Mechanical Properties. Mat. Res. [online]. 2016, vol.19, n.4, pp.765-769.  Epub 13-Maio-2016. ISSN 1980-5373.  https://doi.org/10.1590/1980-5373-MR-2015-0799.

Microwave assisted rapid sintering was carried out to fabricate aluminum-ZrB2 metal matrix composites containing 1 wt% cobalt and 10, 15 and 20 wt% ZrB2 as the reinforcements at temperatures of 600, 700 and 800°C. The results showed that the highest values of density and bending strength (97% of theoretical density and 240 MPa, respectively) were obtained in a composite containing 15 wt% ZrB2 and 1 wt% Co sintered at 600°C. Furthermore, the optimum values of compressive strength and hardness (350 MPa and 63 Vickers, respectively) were measured for a composite containing 20 wt% ZrB2 sintered at 600°C. At all sintering temperatures, XRD analysis revealed ZrB2 and aluminum as the only crystalline phases. Microstructure investigations demonstrated a homogeneous distribution of ZrB2 particles in the aluminum matrix.

Palavras-chave : Aluminum; Zirconium diboride; Microwave sintering; Metal matrix composites.

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