由上海交通大学540教研组研制成功并由新南中学校办工厂生产的JDSB——1型双色变质块(以下简称双色变质块),是一种适用于AI——Si系合金的长效变质剂,采用Na盐和K盐合理组合压实成型,按不同熔点分成上、下二层,在Al-Si系合金液变质时,充分利用了变质块中的有效成份,延长变质反应时间,简化了变质操作。与散状变质剂相比,双色变质块有以下优点: 1、变质效果稳定,反应平稳,变质有效时间长达三小时。 2、变质块便于组织专门生产、运输,保管方便,免去了使用工厂配制散状变质剂时的 The JDSB - 1 two - color metamorphic mass (hereinafter referred to as two - color metamorphic mass), which was successfully developed by Shanghai Jiaotong University 540 teaching and research institute and produced by Xinnan Middle School, is a long - acting modifier suitable for AI - Si alloys. The Na salt and K salt are compacted and compacted to form upper and lower layers according to different melting points. When the Al-Si alloy fluid is deteriorated, the effective components in the metamorphic blocks are fully utilized to prolong the deterioration reaction time and simplify the deterioration operating. Compared with the bulk modifier, the two-color metamorphic block has the following advantages: 1. The metamorphic effect is stable, the reaction is stable and the metamorphism is valid for up to three hours. 2, metamorphic blocks facilitate the organization of specialized production, transportation, storage convenience, eliminating the need to use the factory preparation of bulk modifier