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Method for modifying SnBi series hypoeutectic alloy and obtained alloy

A hypoeutectic and alloy technology, which is applied in the field of modification of SnBi series hypoeutectic alloys, can solve the problems of increasing the Sn-Bi eutectic phase ratio and not reaching it, and achieves the promotion of alloy nucleation rate, elimination of particles, The effect of suppressing precipitation

Active Publication Date: 2019-03-26
BEIJING COMPO ADVANCED TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has a certain role in solving the problem of solder application, but none of them can inhibit the precipitation of primary β-Sn phase and increase the proportion of Sn-Bi eutectic phase.

Method used

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  • Method for modifying SnBi series hypoeutectic alloy and obtained alloy
  • Method for modifying SnBi series hypoeutectic alloy and obtained alloy
  • Method for modifying SnBi series hypoeutectic alloy and obtained alloy

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Effect test

Embodiment 1

[0038] A method for modifying a SnBi hypoeutectic alloy by using a topological short-range ordered structure. The method induces the transformation of the topological short-range ordered structure through temperature elements. The specific operation steps are: select the SnBi57 hypoeutectic alloy, and select according to the alloy composition Raw materials, each raw material is mixed according to the ratio, vacuum smelted with nitrogen, and borax covering agent is added on the surface of the alloy, the alloy is heated to 400°C for 15-25min, the alloy melt is heated to 950°C, and kept for 20-30min , while adding electromagnetic stirring to make the alloy composition uniform, then cooling down to 400-420 ° C for 20 minutes, and then vacuum casting to prepare the SnBi57 hypoeutectic alloy. The alloy ingot is processed into a cryogenic alloy mold.

Embodiment 2

[0040] A method for modifying a SnBi hypoeutectic alloy using a topological short-range ordered structure. The method induces the transformation of the topological short-range ordered structure through temperature elements. The specific operation steps are: select a SnBi56Cu1.0 hypoeutectic alloy, Select the raw materials for the ingredients, mix the raw materials according to the ratio, vacuum smelt with nitrogen, add boric acid covering agent on the surface of the alloy, heat the alloy to 400°C for 15-25min, heat the alloy melt to 980°C, and keep it warm for 20 ~ 30min, while adding electromagnetic stirring to make the alloy composition uniform, then cooling down to 400-420°C for 30min, and then vacuum casting to prepare a SnBi56Cu1.0 hypoeutectic alloy. The alloy ingots are processed and manufactured into solder sheets for low-temperature brazing of corresponding specifications.

Embodiment 3

[0042] A method for modifying a SnBi hypoeutectic alloy by using a topological short-range ordered structure. The method induces the transformation of the topological short-range ordered structure by temperature elements. The specific operation steps are: select a SnBi45Ag0.3 hypoeutectic alloy, Select the raw materials for the ingredients, mix each raw material according to the ratio, vacuum-fill nitrogen for melting, add boric acid covering agent on the surface of the alloy, heat the alloy to 410°C for 15-25min, raise the temperature of the alloy melt to 1000°C, and keep it warm for 20 ~30min, while adding electromagnetic stirring to make the alloy composition uniform, then cooling down to 400-420°C for 20min, and then vacuum casting to prepare the SnBi45Ag0.3 hypoeutectic alloy. The alloy ingots are smelted and centrifugally atomized to manufacture solder powder for low-temperature brazing of corresponding specifications.

[0043] Such as figure 1 As shown, it is the photo...

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Abstract

The invention relates to a method for modifying a SnBi series hypoeutectic alloy utilizing a topological short-range ordered structure and belongs to the technical field of material modification. According to the method for modifying the SnBi series hypoeutectic alloy utilizing the topological short-range ordered structure, conversion of the topological short-range ordered structure can be realized through temperature factor induction and component factor induction; precipitation of primary beta-Sn is restrained, the proportion of eutectic tissue is greatly increased, and the conversion from hypoeutectic tissue to pseudoeutectic tissue in the alloy solidification process is realized; the method exceeds a traditional microalloy addition modification method in the refinement degree on the alloy crystal particle by several orders of magnitude; and the alloy is guaranteed to have more excellent comprehensive performance, and meanwhile, beneficial utilization on tissue heredity is realizedutilizing the irreversibility of the structure conversion.

Description

technical field [0001] The invention belongs to the technical field of material modification, and in particular relates to a method for modifying a SnBi-based hypoeutectic alloy. Background technique [0002] As a typical binary eutectic alloy with low melting point, the Sn-Bi alloy has a eutectic temperature of 139°C. Due to its low eutectic temperature and low material cost, the Sn-Bi alloy and its based The series of alloys are widely used in the manufacturing fields of soft soldering filler metals and low melting point alloy molds. [0003] However, since Bi in the alloy is a semi-metal element, the lattice structure is a rhombic structure, which is a typical brittle material. Under the action of external force, the Sn-Bi alloy often cracks and fails. Usually, in order to reduce the influence of Bi brittleness on SnBi alloys, Sn-Bi alloys with lower Bi content are selected, and reducing Bi content can improve brittleness. Therefore, SnBi-based hypoeutectic alloys are c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C13/02
CPCC22C1/03C22C13/02
Inventor 张少明贺会军刘希学朱捷王志刚赵朝辉张富文安宁温余苗卢彩涛徐蕾林刚
Owner BEIJING COMPO ADVANCED TECH
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