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Fused salt material and preparation method and application thereof

A molten salt and rare earth technology, applied in the field of molten salt material and its preparation, can solve the problems of inability to simultaneously metamorphose treatment, difficult to control the preparation process, poor effect of the modifier, etc., so as to save the steps of removing slag and degassing and improve the metamorphic treatment. Efficiency, the effect of improving smelting efficiency

Active Publication Date: 2019-06-11
ANHUI POLYTECHNIC UNIV MECHANICAL & ELECTRICAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention: Aiming at the problem that in the current hypoeutectic aluminum-silicon alloy smelting process, simultaneous modification, slag and gas removal, and the poor effect of commonly used modifiers, the present invention provides a molten salt material to solve the above-mentioned problems. At the same time, it overcomes the defects of slow melting, long incubation period, and difficult control of the preparation process of the casting intermediate alloy modifier, and quickly dissolves and disperses the rare earth elements ytterbium and thulium, manganese, lithium, tungsten, magnesium and other elements directly from the molten salt material. In the aluminum alloy melt, enhance the metamorphic effect and improve the mechanical properties of aluminum alloy castings

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  • Fused salt material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: prepare and apply molten salt material as follows:

[0033] 1. Preparation of raw materials:

[0034] Sodium phosphate, aluminum chloride, manganese fluoride, manganese acetate, manganese nitrate, sodium fluoride, sodium fluorosilicate, lithium fluoride, potassium chloride, tungsten carbide, magnesium oxide, zinc oxide have no crystal water, and the purity is uniform More than 99.9wt%, the particle size is 120 mesh;

[0035] The composition of chlorite powder is: Al 2 o 3 is 17.88wt%, loss on ignition is 10.35wt%, FeO is 16.98wt%, MgO is 9.45wt%, CaO is 0.11wt%, TiO 2 0.27wt%, K 2 O+Na 2 O is 0.07wt%, the balance is SiO 2 , the particle size of the chlorite powder is 100 mesh; asphalt is natural asphalt;

[0036] The composition of the hypoeutectic aluminum-silicon alloy is Si 6.5%, Fe 0.04%, Mg 0.25% by weight, the total amount of other impurity elements is ≤0.5%, and the balance is Al;

[0037] 2. Preparation of molten salt materials

[0038] (1...

Embodiment 2

[0046] Embodiment 2: prepare and apply molten salt material as follows:

[0047] 1. Preparation of raw materials:

[0048] Sodium phosphate, aluminum chloride, manganese fluoride, manganese acetate, manganese nitrate, sodium fluoride, sodium fluorosilicate, lithium fluoride, potassium chloride, tungsten carbide, magnesium oxide, zinc oxide have no crystal water, and the purity is uniform More than 99.9wt%, the particle size is 240 mesh;

[0049] The composition of chlorite powder is: Al 2 o 3 is 22.85wt%, loss on ignition is 12.17wt%, FeO is 23.77wt%, MgO is 17.65wt%, CaO is 0.42wt%, TiO 2 1.30wt%, K 2 O+Na 2 O is 0.83wt%, the balance is SiO 2 , the particle size of the chlorite powder is 140 mesh; the pitch is coal tar pitch;

[0050] The composition of the hypoeutectic aluminum-silicon alloy is Si 7.5%, Fe 0.12%, Mg 0.45% by weight, the total amount of other impurity elements is ≤0.5%, and the balance is Al;

[0051] 2. Preparation of molten salt materials

[0052] ...

Embodiment 3

[0060] Embodiment 3: prepare and apply molten salt material as follows:

[0061] 1. Preparation of raw materials:

[0062] Sodium phosphate, aluminum chloride, manganese fluoride, manganese acetate, manganese nitrate, sodium fluoride, sodium fluorosilicate, lithium fluoride, potassium chloride, tungsten carbide, magnesium oxide, zinc oxide have no crystal water, and the purity is uniform More than 99.9wt%, the particle size is 180 mesh;

[0063] The composition of chlorite powder is: Al 2 o 3 is 20.56wt%, loss on ignition is 11.17wt%, FeO is 20.45wt%, MgO is 13.42wt%, CaO is 0.25wt%, TiO 2 0.84wt%, K 2 O+Na 2 O is 0.44wt%, the balance is SiO 2 , the particle size of the chlorite powder is 120 mesh; the asphalt is petroleum asphalt;

[0064] The composition of the hypoeutectic aluminum-silicon alloy is Si 7.0%, Fe 0.08%, Mg 0.35% by weight, the total amount of other impurity elements is ≤0.5%, and the balance is Al;

[0065] 2. Preparation of molten salt materials

[0...

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Abstract

The invention discloses a fused salt material and a preparation method and application thereof, and relates to the field of aluminum alloy modifiers. The fused salt material is prepared from followingraw materials by weight: 13-18% of sodium phosphate, 5-9% of aluminium chloride, 0.6-1.2% of manganous fluoride, 5-8% of manganese acetate, 3-6% of manganese nitrate, 11-15% of sodium fluoride, 3-7%of sodium fluosilicate, 0.2-0.6% of lithium fluoride, 2-7% of ceramic powder and the balance potassium chloride. Through the cooperation of rare earth ytterbium, thulium, sodium, lithium and other multiple modifying elements, the modifying effect is excellent. Chlorite powder in the raw materials can serve as a modifier carrier for degassing and deslagging, the smelting steps are simplified, the smelting efficiency is improved, and the alloy hardness can be remarkably improved through rich aluminium oxide and silicon oxide. A fused salt electrolytic deposition process and a modifying smeltingprocess are combined, the excellent modifying effect of the fused salt material is fully exerted, and the strength, the plasticity and the hardness of an aluminum alloy casting can be remarkably improved.

Description

technical field [0001] The invention relates to the field of aluminum alloy modifiers, in particular to a molten salt material and its preparation method and application. Background technique [0002] The silicon structure of aluminum alloy is composed of coarse five-lobed star-shaped primary silicon and long needle-shaped eutectic silicon. These silicon phases will severely split the Al matrix and cause stress concentration at the tip and corners of the Si phase. The alloy is easy to form cracks along the grain boundaries, or the plate-shaped Si itself cracks, which makes the alloy brittle, the mechanical properties, especially the elongation, are significantly reduced, and the cutting performance is not good. In order to change the existing state of silicon and improve the mechanical properties of the alloy, a modifier is generally added to the alloy to refine the primary silicon and eutectic silicon. [0003] There are many studies on aluminum alloy modifiers at home and...

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/02
Inventor 赵浩峰夏俊于鹏张椿英
Owner ANHUI POLYTECHNIC UNIV MECHANICAL & ELECTRICAL COLLEGE
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