Nickel element additive for aluminum alloy

Abstract

The invention relates to a nickel element additive for an aluminum alloy, comprising the following components in percentage by mass: 60-90% of atomized nickel powder; 2-8% of calcium fluoride; 0-8% of potassium fluosilicate; 0-8% of potassium carbonate; 7.7%-37.7% of potassium fluoroaluminate; 0.2-0.6% of microcrystalline wax powder; and 0.1-0.5% of calcium stearate. The mixed materials are pressed into a round cake shape through a hydraulic machine, the weight of a single block is 500-1500 g, and the density is 4.0-5.5 g / cm3. According to the nickel element additive, under the condition of 700-740 DEG C, when the Ni content is 0.5-2.3%, the casting yield of 96% or above can be achieved within 10-20 min, the impurity content is low, the melting speed is high, the casting yield is high, the smoke amount is small, and safety is good.

Description

technical field [0001] The invention belongs to the field of aluminum alloys, and relates to aluminum alloy additives, in particular to a nickel element additive for aluminum alloys and a production method thereof. Background technique [0002] Industrial pure aluminum has good electrical conductivity, thermal conductivity, corrosion resistance, plastic processing and other properties. It can be processed into plates, strips, foils and extruded products, etc., but its mechanical properties are low. Aluminum alloys are made by adding alloying elements to aluminum. It can significantly improve mechanical properties such as tensile strength and hardness. Nickel element (Ni) is one of the important alloying elements of aluminum alloy, and NiAl can be formed in aluminum alloy 3 Such as intermetallic compounds, improve the hardness, high temperature strength, volume and dimensional stability of the alloy, and have the tendency to make the compound of iron element (Fe) into a bloc...

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Problems solved by technology

[0005] The currently disclosed patents have one or more of the following deficiencies: ① only announced that the raw material of one of the element additives is nickel powder, and the purity and particle size of the nickel powder are specified, but the preparation process of the nickel powder is not specified. Chinese invention patent CN111270096A The purity of the nickel powder in Example 5 is only 92.30%. It is a nickel alloy powder, which has the problems of low purity and high impurity content, and does not illustrate the application performance indicators such as the melting speed of the nickel element additive; 2. the assistant of Chinese invention patent CN111270096A The flux components are KCl, MgCl 2 , KAlF 4 , where KCl, MgCl 2 It is highly hygroscopic, and the flux used as an additive is prone to moisture absorption and deliquescence during production and storage, and there is a risk of explosion after being put into a furnace; ③Chinese invention patent CN111235416A only mentions the purity of metal powder and aluminum powder and particle size, no examples of nickel element additives are given, and the aluminum powder used is ultrafine aluminum powder of -325 mesh. During the production process of mixing and discharging, the ultrafine aluminum powder is very easy to float into the air, and aluminum dust appears The danger of explosion, and aluminum dust is also harmful to human health; ④The sulfur powder contained in the Chinese invention patent CN101709383A will produce obvious pungent smell after being added to the aluminum liquid, and the environmental protection is poor

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