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

Hyunji Kang; Heun Joo Kim; Ju-Yeon Han; Yunju Lee; Young-Keun Jeong; Sung-Tag Oh

doi:10.3740/MRSK.2018.28.9.511

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Fabrication of Densified W-Ti by Reaction Treatment and Spark Plasma Sintering of WO₃-TiH₂ Powder Mixtures WO₃-TiH₂ 혼합분말의 반응처리 및 방전 플라스마 소결에 의한 W-Ti 치밀체 제조

September 2018. pp. 511-515

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Abstract

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

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 28
No :9
Pages :511-515
Received Date : 2018-08-03
Revised Date : 2018-08-20
Accepted Date : 2018-08-27
DOI :https://doi.org/10.3740/MRSK.2018.28.9.511

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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