A kind of preparation method of aluminium-titanium-carbon master alloy
Technical field
The invention belongs to metal material field, particularly a kind of preparation method who is used for the aluminium-titanium-carbon master alloy of refinement aluminium and aluminium alloy crystal grain.
Background technology
The aluminium-titanium-carbon master alloy is the ternary master alloy fining agent that proposes prior to aluminium-titanium-boron master alloy, is the important topic that Chinese scholars is extremely paid close attention to its research always.But since the wettability extreme difference between carbon and the aluminium, the alloying difficulty, and the preparation of aluminium-titanium-carbon for a long time all is a technical barrier.Last century the forties, Britain scholar Cibula just attempts ining all sorts of ways adding carbon in aluminium-titanium solution, wishes to obtain to contain a large amount of TiC particulate aluminium-titanium-carbon master alloys, but does not all have successfully.Up to 1985, Banerji and Reif have obtained the breakthrough of aluminium-titanium-carbon master alloy preparation by the violent stirring method, but at high temperature long-time violent stirring molten aluminium can make, and alloy is seriously air-breathing, oxidization burning loss, a large amount of inclusiones of generation, and energy consumption increases, and has increased production cost greatly; Because the carbon reaction is incomplete, often contain free carbon in the master alloy of preparation in addition, so strict condition and requirement have limited its application in actual production.The patent No. is the production method that 98119378 Chinese patent has been reported a kind of aluminium-titanium-carbon master alloy: aluminum-titanium alloy is melted to 1000-1200 ℃, adds activator, add Graphite Powder 99 again, pour into a tablet form the aluminium-titanium-carbon master alloy then.The characteristics of this technology are to prepare aluminum-titanium alloy earlier, and then with it remelting, and need to add activator, its technology is more complicated also, and the cost height.Document (Journal of Alloys and Compounds, 2005,396:143-150) reported and used K
2TiF
6With the method that Graphite Powder 99 is produced the aluminium-titanium-carbon master alloy, the shortcoming of this method is to emit a large amount of KF and AlF in the production process
3Deng toxic gas, contaminate environment, and often contain salt type impurity etc. in the master alloy, thus polluted aluminium alloy.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide that a kind of cost is low, technology is simple and the preparation method of the aluminium-titanium-carbon master alloy of free of contamination suitable suitability for industrialized production.
The present invention realizes in the following manner:
A kind of preparation method of aluminium-titanium-carbon master alloy is characterized in that may further comprise the steps:
(1) at first be ready to prepare the required raw material of aluminium-titanium-carbon master alloy by following mass percent:
The aluminium of the aluminium of 5.00%-40.00%-carbon binary master alloy, 10.00%-60.00%-titanium binary master alloy, surplus is fine aluminium; The content (wt%) of carbon is 0.50-30.00 in wherein used aluminium-carbon master alloy, and the content (wt%) of titanium is 2.00-40.00 in used aluminium-titanium master alloy;
(2) aluminium-titanium master alloy of reserving 5%-30% places remaining aluminium-titanium master alloy the induction furnace fusing and is warming up to 900-1300 ℃ together with fine aluminium as cold burden;
(3) ready aluminium-carbon master alloy is joined in the melt, insulation and mechanical stirring 2-30 minute, aluminium-titanium master alloy of add reserving then makes melt be chilled to 700-900 ℃ soon, directly casting ingot-forming or be prepared into wire rod.
With consisting of of the aluminium-titanium-carbon master alloy of this method preparation:
Component content (wt%)
Aluminium (Al) 65.00-99.00
Titanium (Ti) 0.20-30.00
Carbon (C) 0.01-6.00
The present invention is that the source of carbon prepares the aluminium-titanium-carbon master alloy with aluminium-carbon binary master alloy, because carbon wherein and compound thereof react with the dissolved titanium than simple substance carbon is easier, thereby preparation process can carry out under lower temperature, and the specific absorption height of carbon, reacts completely; Need not specific installation in the preparation process, preparation technology is simple, production efficiency is high, cost is low; The aluminium-titanium-carbon master alloy thinning effect of preparation has high efficiency and long-lasting, is fit to scale operation and application.
Embodiment
Provide three most preferred embodiments of the present invention below:
Embodiment 1
(1) at first is ready to raw material: 8.00% aluminium-carbon master alloy and aluminium-titanium master alloy of 50.00% by following mass percent, surplus is fine aluminium, the content (wt%) of carbon is 5.00 in wherein used aluminium-carbon master alloy, and the content (wt%) of titanium is 10.00 in used aluminium-titanium master alloy;
(2) reserve aluminium-titanium master alloy of 15% as cold burden, in induction furnace with remaining aluminium-titanium master alloy together with the fine aluminium fusing and be warming up to 1050 ℃;
(3) ready aluminium-carbon master alloy is joined in the melt, insulation and mechanical stirring add aluminium-titanium master alloy of reserving after 15 minutes makes melt be chilled to 850 ℃ soon, direct casting ingot-forming or be prepared into wire rod.
Consisting of of made aluminium-titanium-carbon master alloy:
Component content (wt%)
Aluminium (Al) 94.60
Titanium (Ti) 5.00
Carbon (C) 0.40
Embodiment 2
(1) at first is ready to raw material: 25.00% aluminium-carbon master alloy and aluminium-titanium master alloy of 50.00% by following mass percent, surplus is fine aluminium, the content (wt%) of carbon is 20.00 in wherein used aluminium-carbon master alloy, and the content (wt%) of titanium is 30.00 in used aluminium-titanium master alloy;
(2) reserve aluminium-titanium master alloy of 10% as cold burden, in induction furnace with remaining aluminium-titanium master alloy and fine aluminium fusing and be warming up to 1300 ℃;
(3) ready aluminium-carbon master alloy is joined in the melt, insulation and mechanical stirring add aluminium-titanium master alloy of reserving after 20 minutes makes melt be chilled to 900 ℃ soon, direct casting ingot-forming or be prepared into wire rod.
Consisting of of made aluminium-titanium-carbon master alloy:
Component content (wt%)
Aluminium (Al) 80.00
Titanium (Ti) 15.00
Carbon (C) 5.00
Embodiment 3
(1) at first is ready to raw material: 20.00% aluminium-carbon master alloy and aluminium-titanium master alloy of 80.00% by following mass percent, the content (wt%) of carbon is 10.00 in wherein used aluminium-carbon master alloy, and the content (wt%) of titanium is 10.00 in used aluminium-titanium master alloy;
(2) reserve aluminium-titanium master alloy of 10% as cold burden, in induction furnace with remaining aluminium-titanium master alloy fusing and be warming up to 1150 ℃;
(3) ready aluminium-carbon master alloy is joined in the melt, insulation and mechanical stirring add aluminium-titanium master alloy of reserving after 20 minutes makes melt be cooled to 900 ℃, direct casting ingot-forming or be prepared into wire rod.
Consisting of of made aluminium-titanium-carbon master alloy:
Component content (wt%)
Aluminium (Al) 90.00
Titanium (Ti) 8.00
Carbon (C) 2.00