阅读说明：本技术 粉末冶金铝合金焊接用铝合金焊料及其制备方法 (Aluminum alloy welding material for powder metallurgy aluminum alloy welding and preparation method thereof ) 是由 王学刚 袁兴栋 于 2019-09-04 设计创作，主要内容包括：本发明公开了一种用于粉末冶金铝合金焊接的铝合金焊料及其制备方法,其重量百分比组成为：铝80%~90%,硅5%~11%,铜2.1%~8.5%,镁1%~3.5%,钽0.05%~0.12%。本发明的铝合金焊料可以消除粉末冶金铝合金焊接接头区的孔洞,形成连续均匀的接头,接头抗拉强度达到母材水平,可以广泛应用于各类粉末冶金铝合金制品的焊接。(The invention discloses an aluminum alloy welding material for welding powder metallurgy aluminum alloy and a preparation method thereof, wherein the aluminum alloy welding material comprises the following components in percentage by weight: 80-90% of aluminum, 5-11% of silicon, 2.1-8.5% of copper, 1-3.5% of magnesium and 0.05-0.12% of tantalum. The aluminum alloy welding material can eliminate holes in a welding joint area of powder metallurgy aluminum alloy, form continuous and uniform joints, and can be widely applied to welding of various powder metallurgy aluminum alloy products, and the tensile strength of the joints reaches the level of a base metal.)

1. The aluminum alloy welding material for welding the powder metallurgy aluminum alloy is characterized by comprising the following components in percentage by weight: 80-90% of aluminum, 5-11% of silicon, 2.1-8.5% of copper, 1-3.5% of magnesium and 0.05-0.12% of tantalum.

2. The aluminum alloy solder for welding powder metallurgy aluminum alloy according to claim 1, wherein the aluminum alloy solder comprises the following components in percentage by weight: 82% of aluminum, 7% of silicon, 8.5% of copper, 2.4% of magnesium and 0.1% of tantalum.

3. The aluminum alloy solder for welding powder metallurgy aluminum alloy according to claim 1, wherein the aluminum alloy solder comprises the following components in percentage by weight: 88% of aluminum, 8% of silicon, 2.1% of copper, 1.84% of magnesium and 0.06% of tantalum.

4. The method for preparing an aluminum alloy solder for welding of powder metallurgy aluminum alloy according to any one of claims 1 to 3, wherein the aluminum alloy foil is prepared by weighing the components in a prescribed weight percentage, fully mixing the powders, pressing the mixture into a powder blank, sintering the powder blank under the protection of nitrogen, and finally adopting a hot rolling process to prepare the sintered body into the aluminum alloy foil strip.

5. The aluminum alloy solder for welding powder metallurgy aluminum alloy according to claim 1, wherein the thickness of the aluminum alloy solder foil strip is 80mm to 150 mm.

Technical Field

The invention relates to a solder, in particular to a solder suitable for welding powder metallurgy aluminum alloy and a preparation method thereof.

Background

The powder metallurgy aluminum alloy has the advantages of uniform material structure, no macrosegregation, capability of one-step forming and the like, and can gradually replace cast and forged aluminum alloy in the automobile industry and aerospace. However, the inherent hole defects of the sintered powder metallurgy aluminum alloy cause the weldability to be far lower than that of the cast forging aluminum alloy, on one hand, the holes change the heat conductivity, the thermal expansion coefficient and the hardenability of the sintered body, so that cracks are likely to be generated in a welding seam, a heat affected zone and a base metal; on the other hand, the holes adsorb impurities and oxides, which not only causes unstable welding, but also easily forms solidification cracks and layer tears. This limits the manufacture and application of complex and large parts of powder metallurgy aluminum alloys.

chinese patent CN1274458C discloses an aluminum-based intermediate layer alloy for liquid phase diffusion welding, which comprises 60-95% of aluminum, 0.5-10% of silicon, 0.5-35% of copper, 0.5-10% of magnesium, 0.001-1% of gallium and 0.001-0.1% of rare earth. The rare earth element is at least one of lanthanum, cerium and neodymium. The welding flux can realize the welding of cast forging aluminum and aluminum alloy at the temperature lower than the melting point of aluminum, the tensile strength of a joint reaches the level of a base metal, and the bending plasticity reaches the requirement of welding standard. However, when the solder is used for welding powder metallurgy aluminum alloy, welding cracks can be avoided, but holes exist in a joint area, the welding strength is reduced, and the tensile strength of the joint is lower than that of a base metal. Moreover, the aluminum-based intermediate layer gold foil belt prepared by a quenching method has large brittleness and is inconvenient to be practically applied.

Disclosure of Invention

The invention aims to provide an aluminum alloy welding material for powder metallurgy aluminum alloy welding and a preparation method thereof, which can eliminate joint holes and form continuous and uniform joints, wherein the tensile strength of the joints reaches the level of a base metal.

The technical scheme adopted by the invention for solving the technical problems is as follows:

The aluminum alloy welding material for welding the powder metallurgy aluminum alloy comprises the following components in percentage by weight: 80-90% of aluminum, 5-11% of silicon, 2.1-8.5% of copper, 1-3.5% of magnesium and 0.05-0.12% of tantalum.

The aluminum alloy welding material for welding the powder metallurgy aluminum alloy comprises the following components in percentage by weight: 82% of aluminum, 7% of silicon, 8.5% of copper, 2.4% of magnesium and 0.1% of tantalum.

The aluminum alloy welding material for welding the powder metallurgy aluminum alloy comprises the following components in percentage by weight: 88% of aluminum, 8% of silicon, 2.1% of copper, 1.84% of magnesium and 0.06% of tantalum.

The aluminum alloy welding material for welding the powder metallurgy aluminum alloy has the thickness of 80-150 mm.

The aluminum alloy welding material for powder metallurgy aluminum alloy welding is prepared by weighing powder of each component according to specified weight percentage, fully mixing the powder, pressing the powder into a powder blank, sintering and forming under the protection of nitrogen, and finally preparing an aluminum alloy foil strip from a sintered body by adopting a hot rolling process.

The aluminum alloy welding material of the invention adopts the same matrix element aluminum as the powder metallurgy aluminum alloy, eliminates a heterogeneous interface during the welding of the powder metallurgy aluminum alloy, avoids the discontinuity of components and tissues of a joint area, and improves the bonding force between the powder metallurgy aluminum alloy and the aluminum alloy welding material. The silicon and copper elements in the aluminum alloy solder have the rapid diffusion capability in aluminum, and can fill the inherent hole defects in the powder metallurgy aluminum alloy. Magnesium in the aluminum alloy solder can break oxide films on the surfaces of the powder metallurgy aluminum alloys and promote the diffusion of other elements. The tantalum in the aluminum alloy solder can refine crystal grains and promote the diffusion of silicon and copper elements, so that the holes in a joint area can be eliminated, the hot rolling plastic deformation capability of the aluminum alloy solder can be improved, and the aluminum alloy foil belt with good toughness can be obtained.

Compared with the prior art, the aluminum alloy welding material can effectively eliminate holes in a joint area to form a continuous and uniform joint, the tensile strength of the joint reaches the level of a base metal, and the aluminum alloy welding material can be widely applied to welding of various powder metallurgy aluminum alloy products.

Detailed Description

For a better understanding of the present invention, reference is made to the following examples.