A kind of molten salt material and its preparation method and application

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 modify simultaneously, difficult to control the preparation process, and poor effect of modifying agent, so as to save steps of slag and gas removal and improve the modification process Efficiency, the effect of improving smelting efficiency

Active Publication Date: 2020-01-31
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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  • A kind of molten salt material and its preparation method and application
  • A kind of molten salt material and its preparation method and application

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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 7.5% by weight, Si 7.5%, Fe 0.12%, Mg 0.45%, the total amount of other impurity elements is ≤0.5%, and the balance is Al;

[0051] 2. Preparation of molten salt materials

[...

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 molten salt material, a preparation method and application thereof, and relates to the field of aluminum alloy modifiers. The molten salt material is made of the following raw materials in parts by weight: sodium phosphate 13-18%, aluminum chloride 5-9%, manganese fluoride 0.6-1.2%, manganese acetate 5-8%, manganese nitrate 3-6%, fluorine Sodium chloride 11‑15%, sodium fluorosilicate 3‑7%, lithium fluoride 0.2‑0.6%, ceramic powder 2‑7%, the rest is potassium chloride; rare earth ytterbium, thulium, sodium, lithium, etc. The mutual cooperation of elements makes the metamorphic effect excellent. The chlorite powder in the raw material can be used as a modifier carrier to remove gas and slag, simplify the smelting steps, and improve the smelting efficiency. The rich alumina and silicon oxide can significantly increase the hardness of the alloy. Combining the molten salt electrolytic deposition process with the metamorphic smelting process can give full play to the excellent metamorphic effect of molten salt materials, which can significantly improve the strength, plasticity and hardness of aluminum alloy castings.

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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Patent Type & Authority Patents(China)
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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