CN109355520A

CN109355520A - A kind of Al-Ti-C-B intermediate alloy and preparation method thereof

Info

Publication number: CN109355520A
Application number: CN201811423214.4A
Authority: CN
Inventors: 江鸿翔; 赵九洲
Original assignee: Institute of Metal Research of CAS
Current assignee: Institute of Metal Research of CAS
Priority date: 2018-11-27
Filing date: 2018-11-27
Publication date: 2019-02-19
Anticipated expiration: 2038-11-27
Also published as: CN109355520B

Abstract

The invention discloses a kind of Al-Ti-C-B intermediate alloys and preparation method thereof, belong to the preparation technical field of contained aluminium-base intermediate alloy.The preparation method is used in coverture (potassium fluoroaluminate, CaF₂、MgF₂) protect lower K₂TiF₆、KBF₄, carbon nanotubes mixture and Al melt obtain Al-Ti-C-B alloy melts in 1000 DEG C~1200 DEG C methods reacted, alloy melt, which is finally poured into cooling in mold, can be obtained Al-Ti-C-B intermediate alloy.Preparing Al-Ti-C-B intermediate alloy, simple process and low cost, and prepared Al-Ti-C-B intermediate alloy using this method has excellent grain refining effect to commercial-purity aluminium, possesses good prospects for commercial application.

Description

A kind of Al-Ti-C-B intermediate alloy and preparation method thereof

Technical field

The present invention relates to the preparation technical fields of contained aluminium-base intermediate alloy, and in particular to a kind of Al-Ti-C-B intermediate alloy and Preparation method.

Background technique

Al-Ti-B, Al-Ti-C intermediate alloy are current industrial widely used aluminum grain refiners, to raising The quality and performance of aluminium and aluminium alloy are particularly important.In recent years, the aluminum grain refiners such as Al-Ti-B, Al-Ti-C are ground Study carefully the important topic that always domestic and foreign scholars extremely pay close attention to.With the continuous development of industrial technology, to above-mentioned intermediate alloy matter The requirement of amount increasingly improves.Al-Ti-B alloy refinement ability is stronger under normal conditions, but TiB in alloy₂Particle is coarse, easy In reuniting, and thinning effect is influenced by (murder by poisoning) of solute element Zr, Cr, Si etc.；TiC particle is more in Al-Ti-C alloy Divergence is higher, but the thermal stability of TiC is poor, it was reported that long-time heat preservation at high temperature, the TiC in aluminum melt can be changed into Al₃C₄, so as to cause detailed performance decline, these all limit the industrial development and application of high-quality aluminum alloy grain refiner. Therefore, the production technology for developing high-quality aluminum alloy grain refiner meets aluminium to improve the quality of aluminum grain refiner Demand of the alloy production industry to high quality aluminum grain refiner, has great importance.

Summary of the invention

The object of the present invention is to provide a kind of Al-Ti-C-B intermediate alloys and preparation method thereof, to meet in industrial production Demand to high quality aluminum grain refiner.

The technical scheme is that

A kind of preparation method of Al-Ti-C-B intermediate alloy, this method comprises the following steps:

(1) technical pure aluminium ingot, heating fusing are added into crucible, and aluminum melt is warming up to 1000 DEG C~1200 DEG C；

(2) in coverture (potassium fluoroaluminate, CaF₂、MgF₂) protection under, K₂TiF₆、KBF₄With mixing for carbon source (carbon nanotubes) It closes material to be reacted with Al melt, Al-Ti-C-B alloy melt is obtained after reaction；

(3) villiaumite for pouring out bath surface after being stirred to alloy melt, is poured into cooling in mold, that is, is obtained Al-Ti-C-B intermediate alloy ingot.

In above-mentioned steps (2), by K₂TiF₆、KBF₄It is uniformly mixed with the mixed material of carbon source (carbon nanotubes) with coverture After be covered on Al bath surface.

The K₂TiF₆、KBF₄In the mixed material of carbon source, K₂TiF₆Additional amount account for Al melt weight 10%~ 50%, KBF₄Additional amount account for the 2.5%~12.5% of Al melt weight, the additional amount of carbon source accounts for the 0.2% of Al melt weight ~1%；The carbon source is carbon nanotube.

The coverture is potassium fluoroaluminate, CaF₂And MgF₂Mixture, in which: potassium fluoroaluminate, CaF₂And MgF₂Addition Amount accounts for 5%~10%, 0.025%~0.1% and the 0.025%~0.1% of Al melt weight respectively.

Reaction temperature in above-mentioned steps (2) is 1000 DEG C~1200 DEG C, reaction time 15-30min.

The chemical component of prepared Al-Ti-C- intermediate alloy are as follows: Ti 2.0~10.0%, C 0.2~1.0%, B 0.2~1.0%, Al are surplus.

In the Al-Ti-C- intermediate alloy, TiC particle and TiB₂Uniform particle Dispersed precipitate is in Al matrix, and TiC Son and TiB₂The size of particle is between 50-1500nm.

Also containing blocky and/or strip TiAl in the Al-Ti-C- intermediate alloy₃Phase, TiAl₃The size of phase is 4.0- Between 120 μm.

It advantages of the present invention and has the beneficial effect that:

Contain a large amount of even dispersions in the Al-Ti-C-B Master alloy refiners that the preparation method obtains through the invention Ground is distributed in TiC and TiB in matrix₂Particle, size are distributed between 50nm~500nm mostly.In addition, in the alloy also In the presence of blocky or strip TiAl₃Phase.After carrying out inoculation to pure aluminum or aluminum alloy using prepared intermediate alloy, close Jin Jing's particle size is obviously refined.

Detailed description of the invention

Fig. 1 is the tissue topography of the Al-5.0Ti-0.5C-0.25B intermediate alloy prepared by 1 the method for embodiment；Its In: (a) and (b) is different observation multiples.

Fig. 2 is that the Al-5.0Ti-0.5C-0.25B alloy refinement prepared through 1 the method for embodiment handles postindustrial fine aluminium Grain structure.

Fig. 3 is the tissue topography of the Al-5.0Ti-0.4C-0.3B intermediate alloy prepared by 2 the method for embodiment；Its In: (a) and (b) is different observation multiples.

Fig. 4 is that the Al-5.0Ti-0.4C-0.3B alloy refinement prepared through 2 the method for embodiment handles postindustrial fine aluminium Grain structure.

Specific embodiment

Below in conjunction with attached drawing and two embodiments, the present invention is further described, but protection scope of the present invention and apply model It encloses and is not limited to following embodiment.

Embodiment 1

2 kilograms of commercial-purity aluminiums are melted in inductive crucible and are heated to 1000 DEG C~1200 DEG C, by 520 grams of K₂TiF₆、60 Gram KBF₄, 10g carbon nanotubes, 150 grams of K₃AlF₆, 1 gram of CaF₂With 1 gram of MgF₂Powder is covered in aluminium melt surface after mixing, 30min is kept the temperature at 1000 DEG C~1200 DEG C, pours out bath surface villiaumite, after being stirred to alloy melt, is poured into metal Mould forms Al-5Ti-0.5C-0.25B intermediate alloy ingot.

Fig. 1 is embodiment Al-5Ti-0.5C-0.25B alloy structure pattern obtained.Analysis shows developed TiAl in Al-5Ti-0.5C-0.25B alloy₃For particle size about between 5.2~103 μm, average-size is about 22 μm, TiB₂/ TiC particle size is between 50nm~1.2 μm, and average-size is 0.14 μm, and Slag inclusion content is very low in alloy.

Fig. 2 is the grain structure that the Al-5Ti-0.5C-0.25B alloy refinement prepared through this technology handles postindustrial fine aluminium, Analysis shows the average grain size after refinement is at 100 μm or less.As it can be seen that the Al-5Ti-0.5C- of the art of this patent preparation 0.25B alloy has very strong Grain Refinement Effect.

Embodiment 2

2 kilograms of commercial-purity aluminiums are melted in inductive crucible and are heated to 1000 DEG C~1200 DEG C, by 520 grams of K₂TiF₆、72 Gram KBF₄, 8g carbon nanotubes, 120 grams of K₃AlF₆, 0.5 gram of CaF₂With 0.5 gram of MgF₂Powder is covered in aluminium melt surface after mixing, 25min is kept the temperature at 1000 DEG C~1200 DEG C, pours out bath surface villiaumite, after being stirred to alloy melt, is poured into gold Belong to mould, forms Al-5Ti-0.4C-0.3B intermediate alloy ingot.

Fig. 3 is embodiment Al-5Ti-0.4C-0.3B alloy structure pattern obtained.Analysis shows developed TiAl in Al-5Ti-0.4C-0.3B alloy₃Particle size is about between 4.8~106 μm, and average-size is about 24 μm, TiB₂/ TiC particle size is between 60nm~1.3 μm, and average-size is 0.15 μm, and Slag inclusion content is very low in alloy.

Fig. 4 is the grain structure that the Al-5Ti-0.4C-0.3B alloy refinement prepared through this technology handles postindustrial fine aluminium, Analysis shows the average grain size after refinement is at 100 μm or less.As it can be seen that the Al-5Ti-0.4C- of the art of this patent preparation 0.3B alloy has very strong Grain Refinement Effect.

Claims

1. a kind of preparation method of Al-Ti-C-B intermediate alloy, it is characterised in that: this method comprises the following steps:

(2) under the protection of coverture, K₂TiF₆、KBF₄It is reacted with the mixed material of carbon source with Al melt, is obtained after reaction Al-Ti-C-B alloy melt；

(3) villiaumite for pouring out bath surface after being stirred to alloy melt, is poured into cooling in mold, i.e. acquisition Al- Ti-C-B intermediate alloy ingot.

2. the preparation method of Al-Ti-C-B intermediate alloy described in accordance with the claim 1, it is characterised in that:, will in step (2) K₂TiF₆、KBF₄It is covered on Al bath surface after mixing with the mixed material and coverture of carbon source.

3. the preparation method of Al-Ti-C-B intermediate alloy described in accordance with the claim 1, it is characterised in that: the K₂TiF₆、 KBF₄In the mixed material of carbon source, K₂TiF₆Additional amount account for 10%~50%, KBF of Al melt weight₄Additional amount account for Al The 2.5%~12.5% of melt weight, the additional amount of carbon source account for the 0.2%~1% of Al melt weight；The carbon source is carbon nanometer Pipe.

4. the preparation method of Al-Ti-C-B intermediate alloy described in accordance with the claim 1, it is characterised in that: the coverture is Potassium fluoroaluminate, CaF₂And MgF₂Mixture, in which: potassium fluoroaluminate, CaF₂And MgF₂Additional amount account for Al melt weight respectively 5%~10%, 0.025%~0.1% and 0.025%~0.1%.

5. the preparation method of Al-Ti-C-B intermediate alloy described in accordance with the claim 1, it is characterised in that: the reaction of step (2) Temperature is 1000 DEG C~1200 DEG C, reaction time 15-30min.

6. the Al-Ti-C-B intermediate alloy prepared according to claim 1 the method, it is characterised in that: in the Al-Ti-C- Between alloy chemical component are as follows: Ti 2.0~10.0%, C 0.2~1.0%, B 0.2~1.0%, Al are surplus.

7. Al-Ti-C-B intermediate alloy according to claim 6, it is characterised in that: in the Al-Ti-C- intermediate alloy, TiC particle and TiB₂Uniform particle Dispersed precipitate is in Al matrix, TiC particle and TiB₂The size of particle be 50-1500nm it Between.

8. Al-Ti-C-B intermediate alloy according to claim 6, it is characterised in that: in the Al-Ti-C- intermediate alloy Also containing blocky and/or strip TiAl₃Phase, TiAl₃The size of phase is between 4.0-120 μm.