Mechanical Synthesis and Rapid Consolidation of Nanostructured W-Al2O3 Composite

BooRak Lee; GeolChae Jeong; GeunO Park; In-Jin Shon

Korean Journal of Materials Research, Vol.28, No.6, 343-348, June, 2018

DOI10.3740/MRSK.2018.28.6.343 Export Citation

Mechanical Synthesis and Rapid Consolidation of Nanostructured W-Al2O3 Composite

BooRak Lee, GeolChae Jeong, GeunO Park¹, and In-Jin Shon^{1, †}

Department of Advanced Materials Engineering, Korea Polytechnic University, GyeongGi-Do, Republic of Korea
¹Division of Advanced Materials Engineering, the Research Center of Hydrogen Fuel Cell, Chonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea

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Recently, the properties of nanostructured materials as advanced engineering materials have received great attention. These properties include fracture toughness and a high degree of hardness. To hinder grain growth during sintering, it is necessary to fabricate nanostructured materials. In this respect, a high-frequency induction-heated sintering method has been presented as an effective technique for making nanostructured materials at a lower temperature in a very short heating period. Nanopowders of W and Al2O3 are synthesized from WO3 and Al powders during high-energy ball milling. Highly dense nanostructured W-Al2O3 composites are made within three minutes by high-frequency induction-heated sintering method and materials are evaluated in terms of hardness, fracture toughness, and microstructure. The hardness and fracture toughness of the composite are 1364 kg/mm2 and 7.1 MPa·m1/2, respectively. Fracture toughness of nanostructured W-Al2O3 is higher than that of monolithic Al2O3. The hardness of this composite is higher than that of monolithic W.

Keywords:nanomaterial;sintering;composite;hardness;fracture toughness

[References]

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[1] Smith WF, Structure and Properties of Engineering Alloys, 2nd ed., p.580, McGraw Hill, New York, U.S.A. (1993).

[2] Uray L, Int. J. Refract. Met. Hard Mater., 20, 311 (2002)

[3] Uray L, Int. J. Refract. Met. Hard Mater., 20, 319 (2002)

[4] Malewar R, Kumar KS, Murty BS, Sarma B, Pabi SK, J. Mater. Res., 22, 1200 (2007)

[5] El-Eskandarany MS, J. Alloy. Compd., 305, 225 (2000)

[6] Shon IJ, Int. J. Refract. Met. Hard Mater., 64, 242 (2017)

[7] Shon IJ, Lee SJ, Int. J. Refract. Met. Hard Mater., 65, 69 (2017)

[8] Shon IJ, Korean J. Met. Mater., 54, 826 (2016)

[9] Shon IJ, Int. J. Refract. Met. Hard Mater., 72, 257 (2018)

[10] Lassner E, Schubert WD, Kluwer Academic/Plenum Publishers, New York, pp.255 1999.

[11] Shon IJ, Kwon HJ, Oh HS, Electron. Mater. Lett., 10, 337 (2014)

[12] Suryanarayana C, Norton MG, X-ray diffraction: a practical approach, Plenum Press, New York, 1998.

[13] Shen ZJ, Johnsson M, Zhao Z, Nygren M, J. Am. Ceram. Soc., 85(8), 1921 (2002)

[14] Garay JE, Anselmi-Tamburini U, Munir ZA, Glade SC, Asoka-Kumar P, Appl. Phys. Lett., 85, 573 (2004)

[15] Shon IJ, Ceram. Int., 42, 15113 (2016)

[16] Shon IJ, Ceram. Int., 42, 13314 (2016)

[17] Kim WB, Roh KM, Lim JM, Oh HS, Shon IJ, J. Alloy. Compd., 574, 260 (2013)

[18] Niihara K, Morena R, Hasselman DPH, Mater. Sci. Lett., 1, 13 (1982)

[19] Rahaman MN, Yao AH, Bal BS, Garino JP, Ries MD, J. Am. Ceram. Soc., 90(7), 1965 (2007)