一、前言铝,特别是压延用材料,在熔融、铸造中,除掉其熔体中的氢和杂质,对熔体进行处理是不可缺少的。其背景是近年来随着从数量到质量的变化,了出现产品优质化的趋向。过去忽视的问题是较大的夹杂物和熔体凝固时产生金属间化合物造成制品产生缺陷、使材料性能降低,因此,塑性加工,热处理工序以前的质量控制正受到重视。图1示出了以板 I. INTRODUCTION Aluminum, especially for calendering, is indispensable for the melt handling in melting and casting to remove the hydrogen and impurities in its melt. The background is that in recent years, with the change from quantity to quality, the trend of product quality appears. In the past, the problems that were neglected were that larger inclusions and the intermetallic compounds produced during the solidification of the melt caused defects in the product and reduced the properties of the material. Therefore, quality control prior to the plastic working and heat treatment processes has drawn great attention. Figure 1 shows the board