MICROSTRUCTURE ANALYSIS OF TUNGSTEN HEAVY ALLOYS OBTAINED BY SOLID AND LIQUID PHASE SINTERING
Heavy alloys based tungsten with composition 90W-7Ni-3Fe were homogenized 2 hours and pressed through bilateral compaction in a rigid die, followed by sintering in solid state at 1275 0C, 1h, in hydrogen atmosphere. The dimensions of the tungsten particles were of approximately 3,6 µm and their apparent density of 4 g/cm3. After the sintering in solid state the heavy alloy was sintered with liquid phase at 1500 °C for 30-60 min. The microstructure of the heavy alloy based tungsten, sintered in 2 steps, shows that the spherical particles of W are more fine at the sintering in solid state than that at sintering with liquid phase, has a tensile of 15 % and a tensile strength of 900 MPa.Key words: Heavy alloys, composites, liquid phase sintering.
Lenel, F.V., Powder Metallurgy, Principles and Applications, MPIF, Princeton, NJ, 1980.
German, R.M., Tungsten and Tungsten Alloys-1992, Eds., A. Bose and R.J. Dowding, MPIF, Princeton, NJ, 1992.
Bose, A., Couque, H. and Lankford, Jr., Tungsten and Tungsten Alloys 1992, Eds., A. Bose and Downing R.J., MPIF, Princeton, NJ, 1992.
Gurwell, W.E., Proc.2nd Inter.Conf. On Tungsten and Refractory Metals. Res., 11, 1996.
R. Muresan, Thesis, Tehnical University of Cluj-Napoca, 2000.
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