Preparation method for AuSn20 alloy brazing filler metal used for packaging integrated circuit and usage thereof
A technology of alloy brazing filler metal and integrated circuit is applied in the field of preparation of AuSn20 alloy brazing filler metal for integrated circuit packaging.
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Embodiment 1
[0038] Example 1: Production of foil strips
[0039] 1) Prepare high-purity (purity is 5N) gold and high-purity (purity is 5N, 5N is 99.999%) tin materials according to the ratio range of Sn: 20% ± 1%, Au: balance calculation, weighing;
[0040] 2) gold and tin are put into the alumina crucible of vacuum casting furnace;
[0041] 3) Seal the furnace and evacuate to 4Pa;
[0042] 4) Heating, control the heating rate to 30°C / min;
[0043] 5) After the gold and tin are completely melted, control the temperature of the melt at 500-600°C, and scouring for 5 minutes to fully alloy and fully degas;
[0044] 6) Casting, the pouring temperature is between 500 and 600°C, pouring in a graphite mold, and obtaining AuSn after cooling 20 alloy rod.
[0045] 7) Processed into strips using the quenching strip technology: using a vacuum quenching strip machine, the AuSn 20 The alloy rod is placed in a quartz tube with a bottom hole and heated by a high-frequency induction coil;
[0046] 8)...
Embodiment 2
[0053] Embodiment 2: disc alloy products
[0054] Step 1) to step 12) are the same as in Example 1, first obtain an AuSn20 alloy thin strip with a thickness of 0.05-0.08mm; then roll and shape it, and the thickness after processing is 0.05±0.005mm, and then carry out stamping processing to prepare Φ2.5mm×thickness 0.1mm wafer product. The processed AuSn 20 Alloy wafer products are cleaned with acidic cleaning solution and alkaline cleaning solution by soaking and stirring methods to remove pollution caused during processing and make the surface of the product clean and bright.
Embodiment 3
[0055] Embodiment 3: disc alloy product
[0056] Step 1) to step 12) are the same as in Example 1, first obtain an AuSn20 alloy thin strip with a thickness of 0.05-0.08mm; then roll and shape it, and the thickness after processing is 0.05±0.005mm, and then carry out stamping processing to prepare Outer diameter Φ1.0mm-inner diameter Φ0.6mm (or other specifications) circular products. The processed AuSn 20 Alloy ring-shaped products are cleaned with acidic cleaning solution and alkaline cleaning solution by soaking and stirring to remove pollution caused during processing and make the surface of the product clean and bright.
[0057] It is a creative point of the present invention to process the AuSn20 alloy brazing filler metal into strips by adopting the technology of quenching and stripping. The linear speed is 30-40m / s; the distance between the bottom hole of the quartz tube and the surface of the copper roller is 1-4mm.
[0058] In each of the above-mentioned embodiment...
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Abstract
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