Microalloying gold and tin alloy material and preparation method thereof

Abstract

The invention discloses a microalloying gold and tin alloy material and a preparation method thereof and belongs to the field of new materials. According to the microalloying gold and tin alloy material and the preparation method thereof, due to the fact that trace elements are added into a gold and tin eutectic alloy, a microalloying gold and tin eutectic alloy is prepared through high-frequencyinduction smelting, cold mold casting is performed, nodulizing annealing is performed, and after constant temperature hot rolling, a microalloying gold and tin alloy foil strip material can be obtained. The method is simple in preparation process, an alloy structure is controllable, the heat processing performance is good, the production process and the material itself are free of pollution to theenvironment, and scale production can be achieved easily.

Description

technical field [0001] The invention relates to a tin alloy material, in particular to a microalloyed gold-tin alloy and a preparation method thereof, belonging to the field of new materials. Background technique [0002] Gold-tin eutectic (Au-20wt.%Sn) alloy has the advantages of high welding strength, good wettability, high electrical and thermal conductivity, good corrosion resistance and oxidation resistance, and is suitable as a brazing material for high-reliability microelectronics device and optoelectronic device packaging. The soldering temperature of Au-20wt.%Sn solder is about 300℃, and the temperature is moderate and easy to solder. It is the best solder for gradient packaging at present. However, the eutectic reaction L→ζ-Au occurred at 280°C during the solidification process of the Au-20wt.%Sn alloy containing 20 wt.% Sn 5 Sn+δ-AuSn, formed by ζ’-Au 5 The eutectic structure composed of two hard and brittle phases of Sn and δ-AuSn, and the solidified structure...

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Problems solved by technology

[0004] CN1026394C discloses the preparation of gold-tin foil by laminated composite method, but the relative content of Au and Sn in the foil prepared in this method will change, and it is difficult to meet the requirements of eutectic composition

This method requires multiple thermal compressions from the alloy ingot to the sheet. After each thermal compression, it must be annealed between passes in the range of 240°C to 260°C. Each annealing time is more than 20min, which has high energy consumption and high efficiency. Low

[0007] CN101428390A proposes pouring molten gold-tin alloy liquid into a quartz casting mold, and then hot-rolling the ingot at 250°C. This method can refine the as-cast structure grains of the alloy, but coarse grains still appear in the as-cast structure. Dendrites, which are not conducive to the processing and formability of gold-tin alloys

The rolling pass deformation is less than 0.5%, the heating time is more than 10 minutes, and the production efficiency needs to be improved

[0008] CN106834782A utilizes continuous casting equipment and crystallizers to prepare gold-tin alloy wire rods. CN104785957A proposes to melt gold-tin alloys and cast them into rods, and then roll them into wires with a hot wire rolling machine, but these two processes are only suitable for preparing gold-tin alloys. Alloy wire, gold-tin alloy foil cannot be prepared

This method needs to first deposit Ti / Pt / Au or Ni / Pt / Au as the underlying metal film on the CuW sub-heat sink. The process is complicated and requires the use of a variety of high-purity metal targets. increase production cost

[0011] With regard to the rapid solidification method of the strip: CN102114584A discloses a method for preparing the gold-tin eutectic alloy by the rapid solidification of the strip, which requires the whole preparation process to be carried out under vacuum conditions, and has strict requirements on vacuum degree and equipment, which is not conducive to industry mass production

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