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Al-Ti-C crystal grain fining agent and its producing process

A grain refiner and manufacturing process technology, which is applied in the field of metal materials, can solve the problems of difficult stable control of the process, decline in product quality during ingot deformation processing, and sensitive preparation process parameters, etc., to achieve high activity and thermodynamic stability, strong Decline of grain refinement effect, effect of improvement of grain refinement effect

Inactive Publication Date: 2003-09-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the refiner still has the following problems: (1) the metallurgical quality of the Al-Ti-B grain refiner is poor, and the inclusion content is high, which pollutes the aluminum and aluminum alloy grains while refining the aluminum and aluminum alloy grains aluminum alloy
(2) TiB in Al-Ti-B 2 The particle size is large, it is easy to gather and sink in the molten aluminum, and it is easy to be "poisoned" by trace elements such as Zr, Cr, Mn in the molten aluminum, which not only leads to a decline in the quality of the ingot deformed products, but also causes crystals to appear. Grain refinement effect decay phenomenon
(3) Less than 1% of the compounds in Al-Ti-B really act as heterogeneous nucleation substrates, and their nucleation potential is far from being brought into play
(4) The structure of Al-Ti-B is extremely sensitive to the parameters of the preparation process, which affects the stability of its production and application
This smelting method is not only complicated in process, difficult to control the process stably, but also inevitably brings in foreign inclusions, and it is also difficult to prepare Al-Ti-C master alloy refiner with TiC particle content greater than 15%, so it is difficult to achieve high efficiency and cleanliness , Preparation of stable Al-Ti-C grain refiner

Method used

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  • Al-Ti-C crystal grain fining agent and its producing process
  • Al-Ti-C crystal grain fining agent and its producing process
  • Al-Ti-C crystal grain fining agent and its producing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 30%Ti+7%C+63%Al,

[0021] (1) Ball milling and mixing for 24 hours, grinding balls Al 2 o 3 , the ratio of ball to material is 1 / 3;

[0022] (2) The mixture is cold-pressed into a prefabricated block with a relative compactness of 60%;

[0023] (3) Dry the prefabricated blocks at 150° C. for 1 hour.

[0024] In the reaction chamber of high-purity argon gas, a self-propagating reaction occurs to obtain a grain refiner. The size of TiC synthesized in the refiner is 3-4 μm, and the product is relatively dense. When the amount added to the aluminum liquid is 0.5% by weight , The solidified sample has an equiaxed crystal structure, the grain size is refined to about 200 μm, and the stability of the grain refinement effect is about 0.5 hours.

Embodiment 2

[0026] 40%Ti+10%C+50%Al

[0027] (1) Ball milling and mixing for 10 hours, grinding balls Al 2 o 3 , the ratio of ball to material is 1 / 4;

[0028] (2) The mixture is cold-pressed into a prefabricated block with a relative compactness of 50%;

[0029] (3) Dry the prefabricated block at 100° C. for 1 hour.

[0030] The self-propagating reaction is the same as above, and the size of TiC synthesized in the refining agent is 2-3 μm, and the degree of looseness of the product is moderate. When the amount added to the aluminum liquid is 0.2% by weight, the solidified sample has an equiaxed crystal structure, and the grain size Refinement to 150-200μm, the stability of the grain refinement effect is 1 hour.

Embodiment 3

[0032] 56%Ti+14%C+30%Al

[0033] (1) Ball milling and mixing for 12 hours, grinding balls Al 2 o 3 , ball to material ratio 1 / 5,

[0034] (2) The mixture is cold-pressed into a prefabricated block with a relative compactness of 40%,

[0035] (3) The prefabricated blocks were dried at 150° C. for 0.5 hours.

[0036] The self-propagating reaction is the same as above, and the TiC grain size synthesized in the refiner is about 1 μm, and the product is loose and porous, with about 30% of pores. When the amount added to the aluminum liquid is 0.1% by weight, the solidified sample has a fine Equiaxed crystal structure, the grain size is about 150μm.

[0037] figure 1 (a) is the fracture morphology of the refiner, figure 1 (b) Its microstructure shows that TiC is a spherical particle of about 1 μm, and is distributed in an arc in the aluminum matrix, and no aggregation of TiC particles is found.

[0038] Using the synthesized Al-Ti-C grain refiner, the grain refinement effect ...

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Abstract

The present invention relates to the field of metal material technology and aims at providing one technological process of producing crystal grain fining agent for aluminum and aluminum alloy at low cost. The said crystal grain fining agent has the ingredients of: Ti 30-60 wt% and C 7-15 wt% except Al. Its production process inclues the steps: ball milling to mix material, cold pressing of mixed material into lump with 30-60 % relative compactness, stoving the lump at 100-200 deg.c and self-pervasion high temperature composition to form the crystal grain fining agent inside one high pure argon reactor. The technological process is simple, low in power consumption and high in temperature and produce porous crystal grain fining agent with less impurity, high TiC particle content and very high activity and thermodynamic stability.

Description

technical field [0001] The invention belongs to the technical field of metal materials, in particular to a grain refiner for aluminum and aluminum alloys and a manufacturing process thereof. Background technique [0002] The miniaturization of grains is one of the main ways to improve the performance of traditional metal materials. Especially for aluminum and aluminum alloys, the refinement of grains can significantly improve the mechanical properties, casting properties, deformation processing properties and surface quality of materials. Therefore, the grain refinement of aluminum and aluminum alloys is a research topic that is widely valued in the modern aluminum processing industry. [0003] At present, Al-Ti-B master alloy is the most commonly used grain refiner in aluminum and aluminum alloys, and has a good grain refinement effect in some aluminum and aluminum alloys. However, the refiner still has the following problems: (1) the metallurgical quality of the Al-Ti-B ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C21/00
Inventor 严有为魏伯康林汉同
Owner HUAZHONG UNIV OF SCI & TECH
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