Al-Er-B heat-resisting alloy filament and preparation method thereof

Abstract

The invention provides an Al-Er-B heat-resisting alloy filament and a preparation method thereof. The alloy filament is prepared from the following alloy elements in percentage by weight: 0.01%-0.02%of B, 0.08%-0.15% of Er, less than or equal to 0.06% of Si, less than or equal to 0.2% of Fe, less than or equal to 0.012% of (V+Ti+Cr+Mn), and the balance of aluminum and other inevitable impurities.Trace alloy elements are added into an alloy, the alloy is modified by adding trace rare earth Er elements, and the alloy element contents are optimized and adjusted. The alloy mechanical propertiesare guaranteed, the electric conductivity is improved, the filament electric conductivity is greater than or equal to 62.3% IACS at 20 DEG C, the strength of extension is greater than or equal to 161MPa, the ductility is 2.5%, the strength survival rate is greater than or equal to 90% after heat preservation for 1h at 230 DEG C, and the requirement of 150 DED C of a long-time operational temperature is met.

Description

technical field [0001] The invention belongs to the technical field of transmission line overhead conductor manufacturing, and specifically relates to an Al-Er-B heat-resistant alloy monofilament and a preparation method thereof. Background technique [0002] The research and application of alloy material overhead wires has been in the course of a century. Due to its high strength, light weight, and good electrical conductivity, the United States began to use aluminum alloy materials as conductors in 1921. [0003] The existing power grid construction has higher and higher requirements for overhead transmission wires, and new transmission lines with long distance, large capacity and long span are showing a growing trend. High voltage, long-distance and large-capacity transmission lines have higher and higher requirements on the heat resistance and strength of transmission lines. Vertically, zirconium, titanium, etc. are usually added to electrical pure aluminum to increase ...

AI Technical Summary

Problems solved by technology

This reduction in the number of electrons conducted has undoubtedly led to a reduction in the conductivity of the aluminum conductor.

The puffing treatment causes the impurity elements to react, transforming them from a solid state to a combined state and depositing them at the bottom of the solution, which improves the conductivity of the aluminum alloy to a certain extent, but the existence of zirconium and titanium alloy elements will produce a certain amount of crystallization with excessive B. The effect of grain refinement reduces the high-temperature strength of the alloy and deteriorates the heat resistance

[0005] No. 2015102005542.9 Chinese patent titled a high-conductivity heat-resistant aluminum alloy monofilament and its preparation method, although heat resistance is guaranteed, but the conductivity of the alloy is reduced

Images