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The proportion of tantalum and niobium in the quaternary solid solution.

2017-07-05

 The proportion of tantalum and niobium in the quaternary solid solution

 Although we talk about tantalum and niobium with many similarities, but they are not the same material, which also makes the use of niobium in the process can not be replaced by tantalum. Here we talk about an aspect of the problem, previously mentioned, because (Ta, Nb) C by the poor wetness of Co, they rely on solid solution with the WC, so the alloy powder can not be unlimited to increase tantalum and niobium content. And the atomic weight of Ta is 180.95 and niobium is 92.91, which means that the same weight percentage of niobium is nearly doubled from the number of tantalum atoms, and their solid solution with Ti and W is the replacement solution. Related to the number of atoms. Therefore, the original alloy powder in the tantalum content can not be unlimited with niobium instead. So how much is it appropriate, I think TaC: NbC 8: 2 the most appropriate (specific ratio to the use of alloy performance). Because according to this ratio of the performance of the alloy with the original completely containing tantalum alloy performance is very close or even no difference. In addition, the density of the alloy, the shrinkage coefficient of the compact, the sintering system and so will not have much change.

The proportion of tantalum and niobium in the quaternary solid solution.  I think TaC: NbC 8: 2 the most appropriate (specific ratio to the use of alloy performance). Because according to this ratio of the performance of the alloy with the original completely containing tantalum alloy performance is very close or even no difference.

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