Preparation of 90W-7Ni-3Fe Heavy Alloy Sheet by Tape-casting

90W-7Ni-3Fe heavy alloy thin plate, with the thickness less than 0.1 mm, was prepared by the process of tape-casting, laminating, rubber discharging, sintering and cold rolling. Scanning electron microscope was used to observe the tapes. The mixed metal particles are evenly distributed in the binder. Comprehensive thermal analysis was carried out to get the binder remove scheme. The results of the carbon/sulfur analysis show that the binder in W-Ni-Fe alloy is almost removed, and the carbon content is 0.012%similar to 0.018%. The morphology, relative density and hardness of 90W-7Ni-3Fe plates with different sintering temperatures were analyzed. When the sintering temperature is 1450 degrees C, the degree of densification increases and the grain size of W does not grow too large. The sintered 90W-7Ni-3Fe plates were treated by cold rolling. The W grains are elongated into the oblate ellipsoidal shape along the rolling direction, while the Ni-Fe phase which has better toughness than W grains is also stretched and lengthened in the rolling direction, and pores are eliminated, improving the density and hardness of the plate effectively.