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INFLUENCE OF IMPURITIES OF Si AND Na ON INTERFACE STRUCTURE OF W-Ni-Fe HEAVY ALLOY

Zhou Guoan,Liu yong,Deng Xin,Huang Jihua  
In this paper,the effect of impurities of Si and Na of W-Ni-Fe interface structure of heavy alloy is studied by adding trace amount of Na to heavy alloy artificially.It is found that the importing Si and Na result in the formation of pore at the interface of W-Ni-Fe and W-W.In addition,layer SiO2 impurity phase comes into being due to the segregation of Si and Na at W-Ni-Fe interface.The pore and impurity phase damage the bondage of W and Ni,Fe severely and produce microfracture during cooling.This is an imporant factor lowering the properties of heavy alloy.
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