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Grain fining agent for casting aluminium alloy, preparation process and application thereof

A grain refiner and casting aluminum alloy technology, which is applied in the field of aluminum alloy, can solve the problems of unsatisfactory aluminum alloy matrix refinement effect and insufficient improvement of alloy comprehensive performance, so as to increase interfacial energy and comprehensive performance Improvement, wear performance and service life improvement effect

Inactive Publication Date: 2006-11-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]The current aluminum alloy grain refiner is a rod-shaped or block-shaped Al-Ti-B grain refiner, but the rod-shaped or block-shaped Al-Ti-B grain refiner is added to the aluminum alloy smelting The bulk Al-Ti-B grain refiner still has casting defects, and the overall performance of the alloy cannot be greatly improved
CN 98119378.1 "composite grain refiner for aluminum and aluminum alloy and its preparation process" and CN02138361.8 "composite grain refiner for aluminum and aluminum alloy and its preparation process" disclose The grain refiner composed of rare earth or rare earth elements and alkaline earth elements, this kind of aluminum alloy grain refiner is smelted by ordinary smelting process, the grain size of the refiner is not nano-scale, so the aluminum alloy matrix The thinning effect is not ideal

Method used

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  • Grain fining agent for casting aluminium alloy, preparation process and application thereof
  • Grain fining agent for casting aluminium alloy, preparation process and application thereof
  • Grain fining agent for casting aluminium alloy, preparation process and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A nanocrystalline ribbon-shaped grain refiner composed of Cu-P master alloy and Al-Ti-B master alloy was prepared by the rapid quenching strip method:

[0025] Weigh 350 grams of commercially available Cu-P master alloy and 650 grams of Al-Ti-B master alloy, break them into small pieces, put them in the water-cooled copper crucible of the vacuum quick quenching furnace, put the small pieces at the bottom, and put the larger pieces into small pieces. Put the block on it, adjust the position of the electrode so that the distance between it and the alloy particles in the crucible is 0.5mm, close the furnace door, the inlet and outlet, and the gas release valve, and after vacuuming to higher than 5×10-3Pa, use argon gas Wash the furnace, then fill it with argon gas to 0.04Pa, adjust the arc current to gradually increase to 500A after the arc is started, and melt the alloy. On the wheel, the surface temperature of the molybdenum wheel is 10°C. After the molten liquid alloy c...

Embodiment 2

[0027] A nanocrystalline ribbon-shaped grain refiner composed of Cu-P master alloy and Al-Ti-B master alloy was prepared by the rapid quenching strip method:

[0028] Take by weighing 400 grams of Cu-P master alloy and 600 grams of Al-Ti-B master alloy of embodiment 1, they are broken into fritters, put into the water-cooled copper crucible of vacuum quenching furnace, fritters are placed on the bottom, Put the larger piece on top, adjust the position of the electrode so that the distance between it and the alloy particles in the crucible is 1.0mm, close the furnace door, the inlet and outlet, and the air release valve, and after the vacuum is higher than 5×10-3Pa, use Wash the furnace with argon gas, then fill it with argon gas to 0.045Pa, adjust the arc current to gradually increase to 550A after the arc is started, and melt the alloy. On the water-cooled molybdenum wheel, the surface temperature of the molybdenum wheel is 12.5°C. After the molten liquid alloy contacts with ...

Embodiment 3

[0030] A nanocrystalline ribbon-shaped grain refiner composed of Cu-P master alloy and Al-Ti-B master alloy was prepared by the rapid quenching strip method:

[0031]Take by weighing 450 grams of Cu-P master alloy and 550 grams of Al-Ti-B master alloy of Example 1, they are broken into fritters, put into the water-cooled copper crucible of vacuum quick quenching furnace, fritter is placed on the bottom, Put the larger block on it, adjust the position of the electrode so that the distance between it and the alloy particles in the crucible is 1.5mm, close the furnace door, the inlet and outlet, and the air release valve, and after vacuuming to higher than 5×10-3Pa, use Wash the furnace with argon gas, then fill it with argon gas to 0.05Pa, adjust the arc current to gradually increase to 600A after the arc is started, and melt the alloy. On the water-cooled molybdenum wheel, the surface temperature of the molybdenum wheel is 15°C. After the molten liquid alloy contacts it, it sol...

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Abstract

This invention relates to the crystal grain refining agent which is used to produce aluminium alloy and the method of preparation and application thereof. It is composed of intermediate alloy Cu-P and Al-Ti-B and the crystal grain refine reagent has nanometer crystal band, the weight ratio of the alloy Cu-P to alloy Al-Ti-B is 0.35-0.45:0.65-0.55, the average thickness of bank is 0.3-0.6mm, and the average width is 0.4-1.2mm. The bank is made by quickly quenching flailing. It can be applied to the plunger of the combustion engine by melting metal casting. During the production of aluminium alloy by melting metal, the primary crystal silicon and eutectic silicon can be refined by adding into the crystal grain refine reagent, this increases the energy of interface, so it can decrease the flaw of casting, the over-all properties of the aluminium alloy can be increased. At last, the mechanical property of plunger which is made of aluminium alloy, the abrasion of it and the lifetime of it can improve distinctly.

Description

technical field [0001] The technical solution of the invention relates to aluminum alloys, in particular to a grain refiner for casting aluminum alloys and its preparation and application methods. Background technique [0002] With the continuous development of the engine towards high speed and high pressure, more and more stringent requirements are put forward for the performance of the piston. Many scholars have done a lot of experimental research on how to improve the high-temperature mechanical properties and wear properties of aluminum alloy pistons. In the general aluminum-silicon alloy structure, the eutectic silicon is in the form of thick flakes, and the primary silicon is in the form of thick polygonal blocks and plates. The coarse silicon phase severely splits the matrix and reduces the strength and plasticity of the aluminum alloy. It is an effective way to improve the performance of aluminum-silicon alloys by refining the grains of aluminum alloys to change th...

Claims

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Application Information

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IPC IPC(8): C22C1/06B22D11/16B22F9/08C22C21/00C22F1/04
Inventor 崔春翔董天顺刘双进孙继兵戚玉敏杨伟
Owner HEBEI UNIV OF TECH
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