钨合金-钼叠层飞片的热压烧结连接

Joining Tungsten Alloy molybdenum Layered Flier plates by Hot press Sintering

通过在W、Mo连接板材间均匀铺填W -Mo粉末中间层 ,并加入 4Ni- 3Cu烧结剂 ,在实现W -Mo合金的热压烧结致密化的同时 ,完成了难熔金属W -Mo的低温连接 (15 73K) ,并制备出平行精度高、平面度好、致密度高的钨合金 -钼叠层飞片材料。其间详细探讨了W -Mo合金的烧结致密化机理和叠层飞片的界面连接机理。试验结果表明 ,由于低熔点Cu的添加 ,部分活性烧结剂Ni以液态形式存在 ,使元素W、Mo更易向Ni中溶解和扩散 ,增强了Ni对W、Mo的活化烧结作用 ,从而实现了W -Mo合金的烧结致密化 ;同时在烧结过程中 ,W/W -Mo和W/Mo -Mo的界面处也出现了液相 ,有利于W、Mo向界面处相互扩散 ,并完成了界面的连接。

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.lt 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.