RESEARCH AND DEVELOPMENT OF NEW FILLER MATERIALS FOR JOINING DIFFERENT MATERIALS BY ISOTHERMAL SOLIDIFICATION

等温凝固连接不同材料的新型填充材料的研发

• 批准号: 09555227
• 负责人: SASAGURI Nobuya
• 金额: $ 3.78万
• 依托单位: Kurume National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555227/
• 关键词: Cu-Mn alloy; Brazing; Isothermal solidification; Bond-strength; Ductile cast iron; High chromium cast iron; Ni-hard cast iron; Ag-Cu合金フィラ; Cu-Zn合金フィラ

For the purpose of developing a new filler metal with lower melting point and giving higher bond-strength, several kind of filler metals made of Cu-X alloys and Cu-X-Y alloys (X : Mn or Ag, Y : Fe, Cr or Al) were produced and applied to brazing of a ductile cast iron (DCI) and a mild steel. Irrespective of the kind of filler metal, alloyed phases precipitated at the DCI side and grew toward the steel side by isothermal solidification. In case of using Cu-25% Mn filler metal, a DCI and a steel could be joined at lower temperature of 1223K, and the same bond-strength (about 300 MPa) as brazed with pure copper could be obtained when the DCI and steel was brazed at the temperature (1300 K) lowered by about 80K compared with the usual temperature of copper brazing. When the Cu-25% Mn filler metal was applied to brazing of a high chromium cast iron and a steel, alloyed phases precipitated and the bond-strength showed about 220 MPa. In case of brazing of a Ni-hard cast iron and a steel at 1300K, the bond-strength of about 300 MPa was obtained. The effects of addition of third element to Cu-25% Mn filler metal was observed. Based on the above results, it can be said that the Cu-25% Mn alloy is a promising filler metal with lower melting point for joining cast iron and steel.

为了开发一种熔点更低、结合强度更高的新型钎料，生产了几种由Cu-X合金和Cu-X-Y合金（X：Mn或Ag，Y：Fe、Cr或Al）制成的钎料，并将其应用于球墨铸铁（DCI）和低碳钢的钎焊。无论填充金属的种类如何，合金相都在 DCI 侧析出，并通过等温凝固向钢侧生长。在使用Cu-25%Mn钎料的情况下，DCI和钢可以在1223K的较低温度下连接，并且当DCI和钢在比通常的铜钎焊温度低约80K的温度（1300K）进行钎焊时，可以获得与纯铜钎焊相同的结合强度（约300MPa）。将Cu-25%Mn钎料应用于高铬铸铁与钢的钎焊时，合金相析出，结合强度约为220 MPa。在 1300K 温度下钎焊镍硬铸铁和钢时，可获得约 300 MPa 的结合强度。观察了 Cu-25%Mn 钎料中添加第三种元素的影响。基于以上结果，可以说Cu-25%Mn合金是一种很有前途的低熔点焊料，用于连接铸铁和钢。