期刊
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
卷 72, 期 -, 页码 149-156出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2017.12.022
关键词
Composite materials; Microstructure; Powder technology; Sintering
资金
- Key Projects of the State Key Research and Development Plan [2017YFB0302100]
- National Natural Science Foundation of China [51672070]
- Science & Technology Project of Henan Province [152102410037]
Metal-matrix composite powders of W with Al2O3 reinforcements were synthesized by a novel hydrothermal route, which includes calcination and hydrogen reduction steps. It was found that the pH value and reactant concentration in the hydrothermal reaction had a significant influence on the morphology and particle size of the powders produced. The precursor powder particle size was the smallest for pH values of < 1.0 and a reactant concentration of 0.5 g/ml. The addition of Al2O3 led to significant refinement of W particles produced via this route, and these particles gradually become more spherical with increasing Al2O3 content. Subsequently, bulk Al2O3-reinforced W composites were fabricated by spark plasma sintering. The Al2O3 content was varied from 0 to 15 vol%, and sintering was performed under 30 MPa pressure for 5 min at temperatures of 1800-2100 degrees C. The density of the sintered samples increased with sintering temperature, reaching a value of about 97% of the theoretical value for a sintering temperature of 1900 degrees C. An increase in the Al2O3 content from 0 to 6 vol% resulted in an increase in the micro-hardness of the sintered composite samples from 278 to 423 HV and a decrease in the W grain size from 4.25 to 2.78 mu m.
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