Joining Tungsten Alloy-molybdenum Layered Flier plates by Hot press Sintering

By inserting a mixture of W-Wo powders between the tungsten alloy plate and molybdenum plate,a kind of layered foier-plate(LFP) with high parallelism and excellent densification was fabricated by hot-press sintering at 1 573 K.Using sintering additives 4Ni-3Cu,dense W-Mo alloys can be achieved and the bonding of W to Mo was accomplished simultaneously.The mechanism of densification of W-Mo alloys and interfacial joining of this LFP was then investigated.It was found that at the sintering temperature,some sintering activitor Ni could exist in liquid form due to the addition of Cu.This strengthened the sintering action of Ni on W and Mo,and thus enhanced the densification of W-Mo alloys.At the same time,liquid appeared at both interfaces of W/W-Mo and W-Mo/Mo during the sintering process,which resulted in the diffusion of W and Mo through the interfaces by liquid and finally the joining of the tungsten alloy-molybdenum LFP.