纳米钨辅助氢气还原氧化钨制备超细钨粉

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Abstract In the temperature range of 900-1 100 ℃, the prepared W powder by hydrogen reduction of pure WO₃ powder will have obvious crystal growth. In order to suppress the growth of W grains, the ultrafine tungsten powders were prepared by 10%-40% (mass fraction) nano-tungsten powder assisting hydrogen reduction of WO₃. The effects of reaction temperature and the additive amount of nano-tungsten W(w(nano-W)) on the morphology and particle sizes of the products were studied, and the reaction mechanism of the two methods was also discussed. The results show that whether nano W is added or not, the particle size of W powder increases with the increase of reduction temperature. Without the addition of nano W powder, it is difficult to control the nucleation and growth of the product due to the chemical vapor transport (CVT) in the reaction process. The particle size of the reduced W powder is 2.10-2.78 μm. However, the addition of nano W can weaken the effect of CVT accompanied with nucleating agent in the reaction process, which makes the particle size of W powder decrease significantly. With the increase of w (nano-W) content, the particle size of reduced tungsten powder decreases gradually. When w (nano-W) is 40%, the particle size of reduced tungsten powder is 0.32-0.51 μm.

Key words： hydrogen reduction ultrafine tungsten powders nucleation and growth CVT (chemical vapour transport) reaction mechanism

Received: 13 July 2020 Published: 18 January 2021

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	ZHANG Yong
	ZHANG Guohua

Cite this article:

ZHANG Yong,ZHANG Guohua. Preparation of ultrafine tungsten powder by nano-tungsten assisting hydrogen reduction of tungsten oxide[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(5): 375-380.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I5/375

[1] ZHANG S W, WEN Y, ZHANG H J.Low temperature preparation of tungsten nanoparticles from molten salt[J]. Powder Technology, 2014, 253: 464-466.
[2] FANG Z Z, WANG X, RYU T, et al.Synthesis, sintering, and mechanical properties of nanocrystalline cemented tungsten carbide-A review[J]. International Journal of Refractory Metals and Hard Materials, 2009, 27(2): 288-299.
[3] WON C W, NERSISYAN H H, WON H I, et al.Refractory metal nanopowders: synthesis and characterization[J]. Current Opinion in Solid State and Materials Science, 2010, 14(3/4): 53-68.
[4] KURISHITA H, AMANO Y, KOBAYASHI S, et al. Development of ultra-fine grained W-TiC and their mechanical properties for fusion applications[J]. Journal of Nuclear Materials, 2007, 367/370: 1453-1457.
[5] WU X W, LUO J S, LU B Z, et al.Crystal growth of tungsten during hydrogen reduction of tungsten oxide at high temperature[J]. Transactions of Nonferrous Metals Society of China, 2009, 19(S3): 785-789.
[6] SCHUBERT W D, LASSNER E.Production and characterization of hydrogen-reduced submicron tungsten powders. Part Ⅱ: Controlled decomposition of APT and hydrogen reduction of the oxides[J]. International Journal of Refractory Metals and Hard Materials, 1991, 10(4): 171-183.
[7] AZIMIRAD R, KHOSRAVI P, MOSHFEGH A Z.Influence of hydrogen reduction on growth of tungsten oxide nanowires[J]. Journal of Experimental Nanoscience, 2012, 7(6): 597-602.
[8] MA J, ZHU S G.Direct solid-state synthesis of tungsten carbide nanoparticles from mechanically activated tungsten oxide and graphite[J]. International Journal of Refractory Metals & Hard Materials, 2010, 28(5): 623-627.
[9] VENABLES D S, BROWN M E.Reduction of tungsten oxides with hydrogen and with hydrogen and carbon[J]. Thermochimica Acta, 1996, 285(2): 361-382.
[10] ZIMMERL T, SCHUBERT W D, BICHERL A, et al.Hydrogen reduction of tungsten oxides: Alkali additions, their effect on the metal nucleation process and potassium bronzes under equilibrium conditions[J]. International Journal of Refractory Metals and Hard Materials, 2017, 62: 87-96.
[11] LENZ M, GRUEHN R.Developments in measuring and calculating chemical vapor transport phenomena demonstrated on Cr, Mo, W and their compounds[J]. Chemical Reviews, 1997, 97(8): 2967-2994.
[12] SUN G D, WANG K F, SONG C M, et al.A low-cost, efficient, and industrially feasible pathway for large scale preparation of tungsten nanopowders[J]. International Journal of Refractory Metals and Hard Materials, 2019, 78: 100-106.
[13] WANG D H, SUN G D, ZHANG G H.Preparation of ultrafine Mo powders via carbothermic pre-reduction of molybdenum oxide and deep reduction by hydrogen[J]. International Journal of Refractory Metals and Hard Materials, 2018, 75: 70-77.
[14] SUN G D, ZHANG G H, JI X P, et al.Size-controlled synthesis of nano Mo powders via reduction of commercial MoO₃ with carbon black and hydrogen[J]. International Journal of Refractory Metals and Hard Materials, 2019, 80: 11-22.
[15] SUN G D, ZHANG G H.Novel pathway to prepare Mo nanopowder via hydrogen reduction of MoO₂ containing Mo nanoseeds produced by reducing MoO₃ with carbon black[J]. JOM, 2019, 72(1): 347-353.
[16] SUN G D, ZHANG G H, JIAO S Q, et al.Shape-controlled synthesis of ultrafine molybdenum crystals via salt-assisted reduction of MoO₂ with H₂[J]. The Journal of Physical Chemistry C, 2018, 122(18): 10231-10239.
[17] SUN G D, WANG K F, JI X P, et al.Preparation of ultrafine/ nano Mo particles via NaCl-assisted hydrogen reduction of different-sized MoO₂ powders[J]. International Journal of Refractory Metals and Hard Materials, 2019, 80: 243-252.
[18] SCHULMEYER W V, ORTNER H M.Mechanisms of the hydrogen reduction of molybdenum oxides[J]. International Journal of Refractory Metals and Hard Materials, 2002, 20(4): 261-269.
[19] WANG L, ZHANG G H, WANG J S, et al.Study on hydrogen reduction of ultrafine MoO₂ to produce ultrafine Mo[J]. The Journal of Physical Chemistry C, 2016, 120(7): 4097-4103.
[20] DANG J, ZHANG G H, CHOU K C.A morphological study of the reduction of MoO₂ by hydrogen[J]. High Temperature Materials and Processes, 2015, 34(5): 417-424.
[21] ZHANG Y, JIAO S Q, CHOU K C, et al.Size-controlled synthesis of Mo powders via hydrogen reduction of MoO₂ powders with the assistance of Mo nuclei[J]. International Journal of Hydrogen Energy, 2020, 45(3): 1435-1443.