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Electromagnetic casting method for aluminium-1% silicon fine wire masterbatch for integrated circuit linkage

An integrated circuit and electromagnetic casting technology, which is used in the field of preparation of metal and alloy bonding wire masterbatches, can solve the problems of coarse internal structure grains, low wire elongation, wire breakage, etc. High elongation and smooth surface

Inactive Publication Date: 2003-01-22
黄国兴
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  • Summary
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  • Claims
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AI Technical Summary

Problems solved by technology

In the past, conventional vacuum melting, horizontal continuous casting, continuous casting and rolling or hot top semi-continuous casting (DC method) were mostly used. These methods not only have rough surface and many hidden dangers of cracks, but also have serious component segregation, coarse grains in the internal structure, pinholes, inclusions, etc. Severe, low wire elongation
In the production process, wire breakage is serious when drawing integrated circuit bonding wires with a diameter of less than 0.03mm and integrated circuit bonding packaging. caused by defects in the masterbatch

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] The grade of the prepared alloy is aluminum-1% silicon, the diameter of the alloy ingot is required to be 60 mm, and the weight of the charge is 25 kg. Its electromagnetic continuous casting process is:

[0008] 1. The inductor is made. The induction coil is wound with a φ6mm hollow copper tube with an inner diameter of φ65mm and a height of 65mm, and the number of turns is 8 turns.

[0009] 2. Turn on the 2500Hz, 40-100V power supply, adjust the power, so that the electromagnetic intensity in the sensor is 25mT-100mT. (When a stirring coil is added, adjust the electromagnetic strength of the stirring induction coil to 10-80mT, and this example program does not add a stirring sensor)

[0010] 3. Melt the aluminum alloy and put it into the tundish for refining, degassing and impurity removal for later use.

[0011] 4. Connect to the cooling water channel.

[0012] 5. Adjust the dummy base to the lower end of the crystallizer. Operating procedures:

[0013] Turn on t...

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Abstract

The present invention relates to MF and HF continuous elecromagnetic casting and LF electromagnetic stirring process for preparing aluminum -1% silicon fine wire masterbatch for IC linkage. Into one special 6-120 mm inner diameter induction crystallizer, current of 1000-100000 Hz and current of 5-100 Hz are separately fed to generate electromagnetic field, so that liquid metal is suspended insidethe crystallizer. Under the action of strong electromagnetic stirring and strong water spraying cooling, liquid metal is oriented and solidified fast to realize continuous casting. The features includes excellent surface quality, homogeneous element components without segregation, compact and fine crystal structure, good ventilation, less pinhole and less oxide inclusion.

Description

Technical field [0001] The invention relates to a method for preparing an integrated circuit bonding wire masterbatch and other metal and alloy bonding wire masterbatches. Background technique [0002] Bonding wires for integrated circuits mainly refer to gold wire, silver and its alloy wire, aluminum-silicon, aluminum-magnesium, copper and its alloy, nickel, palladium alloy, etc. Because the above-mentioned metal matrix composite materials are composed of various metal elements with different melting points and different specific gravity. In the past, conventional vacuum melting, horizontal continuous casting, continuous casting and rolling or hot top semi-continuous casting (DC method) were mostly used. These methods not only have rough surface and many hidden dangers of cracks, but also have serious component segregation, coarse grains in the internal structure, pinholes, inclusions, etc. Seriously, the wire elongation is low. In the production process, wire breakage is...

Claims

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Application Information

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IPC IPC(8): B22D11/049
Inventor 黄国兴赵伟旦
Owner 黄国兴
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