论文部分内容阅读
稀土元素的原子序数是从57到71,它们是在1788年由Gadolin发现的,距今已一百八十多年,试验室里的人对它们非常注意,因为它们的化学反应性很强,因为它们之间的化学性质非常相似。它们的分离方法和净化方法是从1940年以后发明的,现在已能生产特别高纯度稀土氧化物,几乎要多少就能生产多少。稀土用于核工业,通常是成为密度很大的硬颗粒,弥散在一种金属基体(常常是铝或不锈钢)中。为了防腐蚀,弥散体通常包一层合金,合金的成分与基体的成分相同。已经研制成很多种弥散体成分,现在都能买到,有的价钱已
The rare earth elements have atomic numbers from 57 to 71, which were discovered by Gadolin in 1788 and have been in the laboratory for more than 180 years. People in the laboratory are paying great attention to them because of their high chemical reactivity, Because of the very similar chemical nature between them. Their method of separation and decontamination was invented from 1940 onwards, and it is now possible to produce very high purity rare earth oxides, almost how much can be produced. Rare earths are used in the nuclear industry, usually as dense, hard particles dispersed in a metallic matrix, often aluminum or stainless steel. In order to prevent corrosion, the dispersion usually consists of an alloy with the same composition as the matrix. Has developed a variety of dispersion components, and now can buy, and some price has been