This study focus on urgent demand for large-size high-homogeneous tungsten heavy alloy (WHA) applied to high-end equipment development in fields of modern medical treatment, nuclear power and etc., and have successively conducted a serial of research, such as alloy design, powder characteristics control technology, accurate control technology of internal stress, inclusions and defects during the forming and sintering process of large-size compacts, crack formation and propagation mechanism in impact fracture, alloy densification, synergistic enhancement of homogeneity and impact resistance and industrial manufacturing technology of large-size high-homogeneous WHA for high-end equipment. It has solved the problems of microstructure control in sintering, residual stress elimination in heat treatment and properties synergistic improvement. Breakthrough the key technics of alloy design, material preparation, forming and sintering of large-size WHA. Illustrate crack formation and propagation mechanism in impact fracture. Establish the principle of density, uniformity and mechanical properties synergistic enhancement. Obtain preparation technology and finally built industry production line with 2000 tons per year.
Two kinds of large-size WHA product are prepared, one is cone shape with 4 tons weight, tensile strength≥900MPa, elongation≥15%, the other one is thin-wall pipe product for security, with φ910/φ850×1005mm size, and properties could meet requirements. These preparation technics are all at international leading level.
