Preparation method of high-conductivity aluminum alloy

Abstract

The invention relates to a preparation method of high-conductivity aluminum alloy and belongs to the field of nonferrous metal materials. The preparation method comprises the following steps of: preparing an aluminum ingot comprising the following alloy elements in percentage by weight: 4.5 to 13.5 percent of Si (silicon), 0.1 to 1.5 percent of Mg (magnesium) and not more than 0.1 percent of impurity elements, smelting the aluminum ingot in a furnace, adding 0.1 to 0.3 percent of zirconium which serves as additive for the alloying treatment, uniformly mixing, then adding 0.1 to 1.35 percent of rare-earth element for degeneration, purifying, degassing and deslagging, and covering the surface of aluminum liquid with a solid covering agent; casting to prepare the aluminum alloy conductor material; and carrying out the first-stage aging treatment and the second-stage aging treatment on the aluminum alloy conductor material, discharging and cooling with air. The manufactured aluminum-silicon alloy can meet the requirements on the aluminum alloy material conductivity and the mechanical property; and moreover, the preparation process is simple, the cost is low, and the mass production is easy to realize.

Description

technical field [0001] The invention relates to a method for manufacturing a conductive aluminum alloy, in particular to a high-conductivity aluminum alloy material suitable for manufacturing power transmission and transformation equipment, and belongs to the field of nonferrous metal materials. technical background [0002] In the power industry, aluminum and its aluminum alloys play an important role. Due to the particularity of power transmission materials and power operation requirements, there are high requirements for electrical conductivity, strength and air tightness for important electrical fittings on high-voltage power transmission and transformation equipment. Domestically, more focus is on the research direction of high-purity aluminum alloys, by reducing the impurity content in the matrix alloy as much as possible (si≤1%), so as to improve the conductivity of the alloy. While domestic bauxite resources are very rich, but the grade of aluminum is low, and accom...

AI Technical Summary

Problems solved by technology

However, it has the following disadvantages: (1) The process is complicated, the cycle is long, and the production efficiency is low, which makes large-scale industrial preparation very difficult, and the size of the prepared material is limited, which limits its application field, making its excellent performance unable to be fully obtained. to play

(2) The technology is difficult, and the gas field protection, atomization speed, cooling speed control and other technical requirements are high when the melt is atomized into powder, otherwise there will be problems such as coarse particles and particles sticking into agglomerates, which will directly reduce the total cost. performance

(3) Introduce impurities. During the mechanical grinding process, impurities will be introduced due to the long-term interaction between metal raw materials, grinding balls, and grinding barrels, which will reduce the electrical conductivity of the alloy; (4) Poor repeatability, the performance of the alloy is directly determined by the particle size of the powder , the dispersion of Si and the uniformity of compound distribution, etc., resulting in unstable alloy quality

[0005] Chen Lifen, Zhang Xuhong, Fang Xiaohan, Tian Baoyun published the paper "Process Test and Application of High Conductivity Al-Si Alloy", through strict control of the quality of Si and Mg elements in ZL101A alloy Percentage, and adjust the heat treatment of cast aluminum alloy ZL101A-T6 to T7 (solution treatment plus stabilization treatment), the structure of cast aluminum parts prepared by this process is loose, slag and gas are easy to be included in the casting, and its mechanical properties are greatly lost