A Novel and Effective PM Phosphorus Modifier

Zhang Zhonghua  Zhang Jingxiang  Bian Xiufang  Liu Xiangfa

doi:10.15980/j.tzzz.2000.02.005

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A Novel and Effective PM Phosphorus Modifier
Issue 2, Pages: 13-15(2000)
Published： 2000 ，
DOI： 10.15980/j.tzzz.2000.02.005

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[1]张忠华,张景祥,边秀房,刘相法,张宝荣,杨守仁,刘国栋.新型高效PM磷变质剂[J].特种铸造及有色合金,2000(02):13-15.

Zhang Zhonghua Zhang Jingxiang Bian Xiufang Liu Xiangfa. A Novel and Effective PM Phosphorus Modifier. [J]. Special Casting & Nonferrous Alloys (2):13-15(2000)
[1]张忠华,张景祥,边秀房,刘相法,张宝荣,杨守仁,刘国栋.新型高效PM磷变质剂[J].特种铸造及有色合金,2000(02):13-15. DOI： 10.15980/j.tzzz.2000.02.005.

Zhang Zhonghua Zhang Jingxiang Bian Xiufang Liu Xiangfa. A Novel and Effective PM Phosphorus Modifier. [J]. Special Casting & Nonferrous Alloys (2):13-15(2000) DOI： 10.15980/j.tzzz.2000.02.005.

摘要

论述了一种新型高效的磷变质剂。试验结果表明 :用 PM对 Al-2 0 Si过共晶合金进行处理后

具有良好的变质效果

变质前

初晶 Si呈粗大六角形板片状

共晶 Si呈粗大针状

平均晶粒尺寸约为 2 50μm;变质后

初晶 Si和共晶 Si都很细小

呈块状和短棒状

晶粒尺寸干砂型为 4 0～ 50 μm

金属型为 2 0～ 30 μm。用 PM变质后

熔体氢含量减少

Abstract

A novel and effective phosphorus modifier——PM is studied.The results show that PM has a good modification effect on Al 20Si hypereutectic alloy.Before modification

the primary Si phase with bulky hexagonal plate and eutectic Si phase with coarse acicular appearance.Average grain size of primary Si phase is about 250 μm.After modification

both primary Si phase and eutectic Si phase appear nubbly and club shaped respectively.Average grain size is 40

0 and 20

0 μm in dry sand mold and permanent mold respectively.Hydrogen content decreases in the melt with PM modification treatment and the mechanism of PM modification is analysed.