Method for refining grains of lead-tin alloy cast structure

A technology of grain refinement and alloy casting, applied in the direction of improving process efficiency, etc., can solve the problems of composition segregation, complex equipment, high cost, etc., achieve grain structure refinement, improve mechanical properties and thermal fatigue performance, and prevent rapid Attenuation effect

Active Publication Date: 2016-01-06
HARBIN INST OF TECH
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  • Description
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that existing chemical method refines the lead-tin alloy casting structure, which easily causes component segregation and affects the electrical properties of the lead-tin alloy, and the physical method refines the lead-tin alloy casting structure, which has complex equipment, large energy consumption and high cost In order to solve the problem that the effect of grain refinement is not large, a method for grain refinement of lead-tin alloy casting structure is provided

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  • Method for refining grains of lead-tin alloy cast structure
  • Method for refining grains of lead-tin alloy cast structure
  • Method for refining grains of lead-tin alloy cast structure

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specific Embodiment approach 1

[0014] Specific embodiment 1: This embodiment is a method for grain refinement of the lead-tin alloy casting structure. The lead-tin alloy is only subjected to ultrasonic treatment in the preparation of the lead-tin alloy melt, and the lead-tin alloy is only poured in the lead-tin alloy melt. Ultrasonic treatment or lead-tin alloy is applied during the process of preparing the lead-tin alloy melt and the process of pouring the lead-tin alloy melt.

[0015] The advantage of this implementation mode:

[0016] One, this embodiment adopts the method of ultrasonic vibration to refine the casting microstructure of lead-tin alloy; due to the application characteristics of lead-tin alloy in the microelectronics industry, the amount of lead-tin alloy is very small when forming components each time, which is beneficial to Prevent the rapid attenuation of ultrasonic vibration in the alloy melt, and realize uniform vibration everywhere inside the lead-tin alloy melt;

[0017] 2. In this ...

specific Embodiment approach 2

[0021] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: the described lead-tin alloy only applies ultrasonic treatment in the preparation of the lead-tin alloy melt, which is completed according to the following steps:

[0022] 1. Melting and stirring the lead-tin alloy at a melting temperature of 400°C to 450°C to obtain a lead-tin alloy melt;

[0023] 2. Heat the lead-tin alloy melt at a temperature of 320°C to 380°C for 10 minutes to 30 minutes, then remove the scum on the surface of the lead-tin alloy melt, and obtain the lead-tin alloy melt after heat preservation and standing and removal of scale. body;

[0024] 3. Put the ultrasonic horn into the lead-tin alloy melt after heat preservation and standing and removing the scale, and then ultrasonically treat it for 50s~120s at the ultrasonic power of 200W~1000W and the ultrasonic frequency of 20000Hz~50000Hz to obtain ultrasonic waves. Treated lead-tin alloy melt;

[0025] 4. Po...

specific Embodiment approach 3

[0028] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the lead-tin alloy is only subjected to ultrasonic treatment during the pouring process of the lead-tin alloy melt, which is completed according to the following steps:

[0029] 1. Melting and stirring the lead-tin alloy at a melting temperature of 400°C to 450°C to obtain a lead-tin alloy melt;

[0030] 2. Heat the lead-tin alloy melt at a temperature of 320°C to 380°C for 10 minutes to 30 minutes, then remove the scum on the surface of the lead-tin alloy melt, and obtain the lead-tin alloy melt after heat preservation and standing and removal of scale. body;

[0031] 3. Apply the ultrasonic horn to the copper mold, and then pour the lead-tin alloy melt into the copper mold under the ultrasonic power of 200W ~ 1000W and the ultrasonic frequency of 20000Hz ~ 50000Hz. Cooling in the mold to obtain a lead-tin alloy ingot with refined grains, that is, a method for grain refinement of a lead...

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Abstract

The invention provides a method for refining grains of a lead-tin alloy cast structure, and relates to a method for refining grains of an alloy cast structure. The method aims at solving the problems that a method for chemically refining the lead-tin alloy cast structure easily causes composition segregation and affects electrical properties of the lead-tin alloy, and a method for physically refining the lead-tin alloy cast structure has the disadvantages of equipment complexity, high energy consumption, high cost and poor grain refinement effect. The method for refining the grains of the lead-tin alloy cast structure is characterized in that ultrasonic treatment is applied to the lead-tin alloy only in a lead-tin alloy melt preparation process, ultrasonic treatment is applied to the lead-tin alloy only in a lead-tin alloy melt pouring process, or ultrasonic treatment is applied to the lead-tin alloy only both in the lead-tin alloy melt preparation process and in the lead-tin alloy melt pouring process. The grain size of the lead-tin alloy cast structure treated by the method is 20 micrometers to 50 micrometers. The method for refining the grains of the lead-tin alloy cast structure can be obtained.

Description

technical field [0001] The invention relates to a grain refinement method of an alloy cast structure. Background technique [0002] Lead-tin alloy is widely used in the microelectronics industry, but its grain casting is often coarse, which makes its mechanical properties and thermal fatigue properties poor. For this reason, it is urgent to refine the casting structure of lead-tin alloy. Traditional alloy grain refinement methods include chemical and physical methods, such as adding nucleating agents, grain growth inhibitors, mechanical stirring, electromagnetic stirring, and gas stirring. However, these methods have disadvantages: chemical methods will introduce impurity elements, which may easily cause defects such as composition segregation; physical methods generally require high equipment, high energy consumption, and limited grain refinement effect. Ultrasonic vibration has been gradually applied to refine the grains of metals and alloys in recent years, but the ultr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22B9/02
CPCY02P10/20
Inventor 李邦盛周扬李绍荣晋玺
Owner HARBIN INST OF TECH
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