Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 68, Issue -, Pages 145-150Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2017.07.008
Keywords
Tungsten nanopowder; Solution combustion synthesis; Hydrogen reduction; Sintering
Funding
- National Natural Science Foundation Program of China [51574031, 51574029, 51604239]
- Natural Science Foundation Program of Beijing [2162027]
- Natural Science Foundation of Fujian Province [2016J05139]
- Education Department of Fujian Province [JA15362]
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In this work, tungsten nanopowder was prepared by solution combustion synthesis (SCS) and hydrogen reduction. First, needle-like W18O49 as precursor was fabricated by SCS. Subsequently, hydrogen reduction of as synthesized precursor was utilized to prepare tungsten nanopowder. The precursor synthesized by SCS exhibits high reduction reactivity and can be completely reduced to pure tungsten nanopowder at as low as 700 degrees C for 2 h. The tungsten particles reduced at 700 degrees C are spherical or elliptical and the particle size is 20-30 nm. The sintering behavior of the as-prepared tungsten nanopowder was investigated by analyzing the sintered compacts obtained at different sintering temperatures. 93.3% of relative density of the compact could be obtained at sintering temperature of 1200 degrees C. The microhardness of the compact sintered at 1500 degrees C reached the highest point of 587.14 Hv(0.2).
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