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A kind of chromium additive for aluminum alloy

An additive and aluminum alloy technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of slow melting speed of chromium additives, unfavorable quality control of aluminum alloy, complicated production process, etc., achieve less burning loss, fast melting speed, Effect of Dendrite Segregation Reduction

Active Publication Date: 2018-04-24
CANGZHOU DONGZHONG SPECIAL ALLOY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The melting speed of common chromium additives in the melting and casting process is relatively slow, the actual yield is relatively low, and the production process is relatively complicated
When the melting temperature is higher than 880°C, the melting time needs to be as long as 1 hour, which causes serious burning loss of aluminum, and is particularly easy to form infusible residual impurities, which is extremely unfavorable to the quality control of aluminum alloys

Method used

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  • A kind of chromium additive for aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (a) Crushing of raw materials: 85kg of chromium powder, 4kg of aluminum powder, 0.03kg of magnesium powder, 0.3kg of iron powder and 0.3kg of manganese powder are crushed under nitrogen protection to a particle size of 80~325 mesh; in terms of mass fraction, 80~100 Mesh accounted for 42.5%, 100~150 mesh accounted for 38.5%, 150~200 mesh accounted for 15.5%, 200~325 mesh accounted for 3.5%;

[0042] (b) Compounding: Add 0.1 kg of zinc stearate as a release agent and 0.2 kg of modified starch as a binder to the crushed raw materials in step (a), and add water to stir in a horizontal powder stirring device 20 minutes; the amount of water added is 1% of the total mass of raw materials, that is, 0.9kg;

[0043] (c) Compression: Press the mixture compounded in step (b) into a round cake under 20MPa;

[0044] (d) Drying: Dry the round cake obtained in step (c) in a desiccator under the protection of nitrogen at a temperature of 200°C for 50 minutes to obtain a finished produc...

Embodiment 2

[0046] (a) Crushing of raw materials: 95kg of chromium powder, 13kg of aluminum powder, 0.03kg of magnesium powder, 0.3kg of iron powder and 0.3kg of manganese powder are crushed under nitrogen protection to a particle size of 80-325 mesh; in terms of mass fraction, 80-100 Mesh accounted for 42.5%, 100~150 mesh accounted for 38.5%, 150~200 mesh accounted for 15.5%, 200~325 mesh accounted for 3.5%;

[0047] (b) Compounding: Add 0.2 kg of zinc stearate as a release agent and 0.4 kg of modified starch as a binder to the crushed raw materials in step (a), and add water to stir in a horizontal powder stirring device 30 minutes; the amount of water added is 3% of the total mass of raw materials, that is, 3.3kg;

[0048] (c) Compression: Press the mixture compounded in step (b) into a round cake at 30MPa;

[0049] (d) Drying: Dry the round cake obtained in step (c) in a desiccator under the protection of nitrogen at a temperature of 280°C for 70 minutes to obtain a finished product....

Embodiment 3

[0051] (a) Crushing of raw materials: 88kg of chromium powder, 7kg of aluminum powder, 0.03kg of magnesium powder, 0.3kg of iron powder and 0.3kg of manganese powder are crushed under nitrogen protection to a particle size of 80~325 mesh; in terms of mass fraction, 80~100 Mesh accounted for 42.5%, 100~150 mesh accounted for 38.5%, 150~200 mesh accounted for 15.5%, 200~325 mesh accounted for 3.5%;

[0052](b) Compounding: Add 0.14 kg of zinc stearate as a release agent and 0.25 kg of modified starch as a binder to the crushed raw materials in step (a), and add water to stir in a horizontal powder stirring device 25 minutes; the amount of water added is 2% of the total mass of raw materials, that is, 1.9kg;

[0053] (c) Compression: compress the mixture compounded in step (b) into granules under 22MPa;

[0054] (d) Drying: Dry the granules obtained in step (c) in a drier under the protection of nitrogen at a temperature of 220°C for 55 minutes to obtain a finished product.

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Abstract

The invention relates to a chromium additive for aluminum alloys, which comprises the following components: 85-95 parts by weight of chromium powder, 4-13 parts by weight of aluminum powder, 0.1-0.2 parts by weight of a release agent, and 0.2-0.4 parts by weight of an adhesive , 0.03 parts by weight of magnesium powder, 0.3 parts by weight of iron powder and 0.3 parts by weight of manganese powder; and are prepared by crushing, compounding, pressing and drying raw materials. The product of the invention has high actual yield, low melting temperature, good melting property and stability.

Description

technical field [0001] The invention relates to the field of metal additives for aluminum alloys, in particular to a chromium additive for aluminum alloys and a preparation method thereof. Background technique [0002] Aluminum and aluminum alloys are widely used in civil, construction and aerospace, and aluminum smelting and processing technology represents the country's industrial development level. [0003] According to different needs, metal components need to be added in the aluminum alloy production process to increase the alloy element composition in aluminum alloy products, and chromium plays a vital role in the aluminum industry and steel industry. [0004] The melting speed of common chromium additives is relatively slow in the melting and casting process, the actual yield is relatively low, and the production process is relatively complicated. When the melting temperature is higher than 880°C, the melting time needs to be as long as 1 hour, which causes serious b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C1/06C22C21/00B22F1/00B22F3/02
CPCC22C1/026C22C1/06C22C21/00B22F3/02B22F1/10
Inventor 张忠华
Owner CANGZHOU DONGZHONG SPECIAL ALLOY MFG CO LTD
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