主要有溶剂萃取、离子交换、真空熔融、真空蒸馏或升华、电迁移以及区域熔炼等。

There are solvent extraction, ion exchange, vacuum melting, vacuum distillation or sublimation, electro migration and regional melting, etc.

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本文对高频真空熔融气相色谱分析仪的测试原理、方法、结构、特点等方面进行了介绍和分析。

The principles, method of the analysis, structure and character of gas chromatographic instrument for vacuum melting furnace with high frequency are introduced and analysed in this paper.

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根据以前工作推导出的计算真空熔融合金中微量元素挥发速率的公式，对铁基合金制作了数表。

On the basis of former formula for calculating vaporization rate constant a digital table was made for iron based alloys.

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