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本文用收缩方程研究了高比容钽块在1600～1800℃烧结收缩问题。得到了收缩率随烧结温度和时间变化的实验方程。当粗粉的压制密度为4.8克/厘米~3,细粉的压制密度为4.0克/厘米~3、4.8克/厘米~3、5.6克/厘米~3时,计算出收缩过程的扩散活化能值为86.34～103.6千卡/克分子。这与原子示踪法测得的体扩散活化能值接近。据此,我们推断钽块烧结收缩时的物质迁移机理主要是体扩散。
In this paper, shrinkage equation was used to study the sintering shrinkage of high specific volume tantalum at 1600-1800 ℃. The experimental equation of shrinkage with sintering temperature and time was obtained. When the compacted density of the coarse powder is 4.8 g / cm3 and the compacted density of the fine powder is 4.0 g / cm3, 3,4.8 g / cm3, and 3.56 g / cm3, the diffusion activation energy The value of 86.34 ~ 103.6 kcal / mole. This is close to the value of bulk diffusion activation energy measured by atomic tracing. Accordingly, we infer that the material migration mechanism of tantalum block shrinkage is mainly body diffusion.