WO3-TiH2 혼합분말의 반응처리 및 방전 플라스마 소결에 의한 W-Ti 치밀체 제조

강현지; 김헌주; 한주연; 이윤주; 정영근; 오승탁; Hyunji Kang; Heun Joo Kim; Ju-Yeon Han; Yunju Lee; Young-Keun Jeong; Sung-Tag Oh

Korean Journal of Materials Research, Vol.28, No.9, 511-515, September, 2018

DOI10.3740/MRSK.2018.28.9.511 Export Citation

WO3-TiH2 혼합분말의 반응처리 및 방전 플라스마 소결에 의한 W-Ti 치밀체 제조

Fabrication of Densified W-Ti by Reaction Treatment and Spark Plasma Sintering of WO3-TiH2 Powder Mixtures

강현지, 김헌주, 한주연, 이윤주, 정영근¹, 오승탁 ^†

서울과학기술대학교 신소재공학과
¹부산대학교 융합학부

Hyunji Kang, Heun Joo Kim, Ju-Yeon Han, Yunju Lee, Young-Keun Jeong¹, and Sung-Tag Oh^†

Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
¹Graduate School of Convergence Science, Pusan National University, Busan 46241, Republic of Korea

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W-10 wt% Ti alloys that have a homogeneous microstructure are prepared by thermal decomposition of WO3-TiH2 powder mixtures and spark plasma sintering. The reduction and dehydrogenation behavior of WO3 and TiH2 are analyzed by temperature programmed reduction and a thermogravimetric method, respectively. The X-ray diffraction analysis of the powder mixture, heat-treated in an argon atmosphere, shows W- oxides and TiO2 peaks. Conversely, the powder mixtures heated in a hydrogen atmosphere are composed of W, WO2 and TiO2 phases at 600 °C and W and W-rich β phases at 800 °C. The densified specimen by spark plasma sintering at 1500 °C in a vacuum using hydrogen-reduced WO3-TiH2 powder mixtures shows a Vickers hardness value of 4.6 GPa and a homogeneous microstructure with pure W, β and Ti phases. The phase evolution dependent on the atmosphere and temperature is explained by the thermal decomposition and reaction behavior of WO3 and TiH2.

Keywords:W-Ti alloy;heat treatment of WO3-TiH2 powders;spark plasma sintering;microstructure

[References]

Jonsson LB, Hedlund C, Katardjiev IV, Berg S, Thin Solid Films, 348(1-2), 227 (1999)
Qingxiang W, Shuhua L, Zhikang F, Xin C, Int. J. Refract. Met. Hard Mater., 28, 576 (2010)
Klopp WD, J. Less-Common Met., 42, 261 (1975)
Lassner E, Schubert WD, Tungsten, Kluwer Academic/Plenum Publishers, New York, USA (1999).
Jahangiri H, Sonmez S, Ovecoglu ML, Indian J. Mater. Sci., 2016, 1 (2016)
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Wilken TR, Morcom WR, Wert CA, Woodhouse JB, Metall. Mater. Trans. B-Proc. Metall. Mater. Proc. Sci., 7, 589 (1976)
Bhosle V, Baburaj EG, Miranova M, Salama K, Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process., 356, 190 (2003)
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Froes FH, Titanium, p. 116, ASM International, Ohio, USA (2015).

[Referenced By]

[Related Articles]

[1] Jonsson LB, Hedlund C, Katardjiev IV, Berg S, Thin Solid Films, 348(1-2), 227 (1999)

[2] Qingxiang W, Shuhua L, Zhikang F, Xin C, Int. J. Refract. Met. Hard Mater., 28, 576 (2010)

[3] Klopp WD, J. Less-Common Met., 42, 261 (1975)

[4] Lassner E, Schubert WD, Tungsten, Kluwer Academic/Plenum Publishers, New York, USA (1999).

[5] Jahangiri H, Sonmez S, Ovecoglu ML, Indian J. Mater. Sci., 2016, 1 (2016)

[6] Kecskes LJ, Hall IW, Metall. Mater. Trans. A-Phys. Metall. Mater. Sci., 26, 2407 (1995)

[7] Wang QX, Wang XH, Yang Y, Fan ZK, Int. J. Refract. Met. Hard Mater., 27, 847 (2009)

[8] Kwon NY, Jeong YK, Oh ST, J. Korean Powder Metall. Inst., 24, 384 (2017)

[9] Robertson SD, McNicol BD, De Baas JH, Kloet SC, Jenkins JW, J. Catal., 37, 424 (1975)

[10] Wilken TR, Morcom WR, Wert CA, Woodhouse JB, Metall. Mater. Trans. B-Proc. Metall. Mater. Proc. Sci., 7, 589 (1976)

[11] Bhosle V, Baburaj EG, Miranova M, Salama K, Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process., 356, 190 (2003)

[12] Massalski TB, Okamoto H, Subramanian PR, Kacprzak L, Binary Alloy Phase Diagrams, 2nd ed., ASM International, Ohio, USA (1990).

[13] Kecskes LJ, Hall IW, J. Mater. Process. Technol., 94, 247 (1999)

[14] Froes FH, Titanium, p. 116, ASM International, Ohio, USA (2015).