A kind of preparation method of aluminum-boron master alloy wire for on-line purification of electrical aluminum melt furnace

Abstract

The invention discloses a preparation method of an aluminum boron intermediate alloy wire for electrician aluminum melt purification, and relates to a preparation method of an alloy wire. The method comprises the following process: (1) after industrial pure aluminum with a purity higher than 99.7% is heated to melt in a heating furnace, 2-3 batches of KBF4 powder are added in the molten pure aluminum melt; (2) when the temperature of a molten alloy reaches 780 DEG C, N2 with a purity of 99.95% is filled in the alloy melt to degas and refine the melt; and (3) when the refined alloy melt is at 720-780 DEG C, AL and B in the alloy melt in aluminum boron are prevented from forming a netty structure under continuous stirring of a stirrer with a rotating speed of 220 RPM to prepare an aluminum boron intermediate alloy wire with a diameter of 9.5 mm; and the wire is continuously wound to a coil after cooling. When liquid-state metal is crystallized, the method is high in cooling strength, dense in structure, uniform in grain distribution and stable and reliable in product quality; and a continuous casting extrusion process of the aluminum boron intermediate alloy wire is advanced.

Description

technical field [0001] The invention relates to a method for preparing an alloy wire, in particular to a method for preparing an aluminum-boron intermediate alloy wire for on-line purification outside an electric aluminum melt furnace. Background technique [0002] Aluminum-boron master alloy is an electrical aluminum melt purification material commonly used in the production process of aluminum and aluminum alloy conductive materials. The B in the aluminum-boron master alloy can interact with the alloying element Cr in the aluminum melt that seriously reduces the electrical conductivity of aluminum and aluminum alloy materials. , Mn, V, Ti and other reactions to form CrB 2 、TiB 2 , VB 2 and MnB 2 Compounds are removed by standing and settling to the bottom of the furnace, thereby significantly improving the conductivity of aluminum and aluminum alloy conductors. The fluoride salt reaction method is the most widely used AlB in industrial production. 2 A method for prepa...

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Problems solved by technology

Its biggest disadvantage is: (1) When the boron content of the melt reaches 2% or more during the preparation of aluminum-boron alloy, amorphous AlB is formed in the melt 2 Reticular structure, the melt is paste-like, the fluidity is very poor, and it is basically impossible to cast. It is difficult to prepare an aluminum-boron master alloy wire with a boron content of 3% and a high AL-3%B master alloy. Domestically, iron molds are mainly used for casting. Production of lumps for furnace charging

(2) Mechanical stirring in the preparation of aluminum-boron master alloy can break the interfacial tension to form a cluster structure, which will inevitably form size differences and uneven properties during ingot casting, which will affect the purification effect of aluminum-boron master alloy on the melt ; (3) Boronation in the electric aluminum melt furnace to form CrB2, TiB2, VB2 and MnB2 compounds, after standing still and settling to the bottom of the furnace, it is necessary to regularly pick the furnace or use a large-investment tilting holding furnace to realize the molten aluminum in the furnace All released, affecting production efficiency or increasing equipment investment

my country's electric power construction has put forward higher requirements for aluminum and aluminum alloy wires. At present, the ingot-shaped Al-B master alloy produced in China can no longer meet the needs of domestic conductive material production.

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