阅读说明：本技术 一种Al-Ti-C-SiC复合材料及其制备方法 (Al-Ti-C-SiC composite material and preparation method thereof ) 是由 温志高 于欢 于 2019-11-12 设计创作，主要内容包括：本发明提供了一种Al-Ti-C-SiC复合材料及其制备方法,解决了现有技术中的Al-Ti-C中间合金在作为细化剂使用时,铝合金材料的细化处理效果不理想的技术问题。它由下述重量百分比的原料制成：Al粉：48%-53.3%；Ti粉：36%-40%；C粉：6%-6.7%；SiC粉：0-10%；各原料的重量百分比之和为100%。本发明制备的Al-Ti-C-SiC复合材料包含纳米SiC和微细TiC颗粒,在使用的过程中,可以使用到晶粒细化处理中和变质处理中,晶粒细化效果良好。(The invention provides an Al-Ti-C-SiC composite material and a preparation method thereof, and solves the technical problem that the refining effect of an aluminum alloy material is not ideal when an Al-Ti-C intermediate alloy is used as a refiner in the prior art. The composite material is prepared from the following raw materials in percentage by weight: al powder: 48% -53.3%; ti powder: 36% -40%; c, powder C: 6 to 6.7 percent; SiC powder: 0 to 10 percent; the sum of the weight percentages of the raw materials is 100 percent. The Al-Ti-C-SiC composite material prepared by the invention contains nano SiC and fine TiC particles, and can be used in grain refinement treatment and modification treatment in the using process, so that the grain refinement effect is good.)

1. An Al-Ti-C-SiC composite material, which is characterized in that: the composite material is prepared from the following raw materials in percentage by weight: al powder: 48% -53.3%; ti powder: 36% -40%; c, powder C: 6 to 6.7 percent; SiC powder: 2 to 10 percent; the sum of the weight percentages of the raw materials is 100 percent.

2. The Al-Ti-C-SiC composite material according to claim 1, characterized in that: the weight percentages of the raw materials are respectively as follows: al powder: 48% -51.7%; ti powder: 37% -39%; c, powder C: 6.1% -6.5%; SiC powder: 3% -10%; the sum of the weight percentages of the raw materials is 100 percent.

3. The Al-Ti-C-SiC composite material according to claim 1 or 2, characterized in that: the weight percentages of the raw materials are respectively as follows: al powder: 50.7 percent; ti powder: 38 percent; c, powder C: 6.3 percent; SiC powder: 5 percent.

4. A method of preparing an Al-Ti-C-SiC composite material according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:

(1) pretreating the nano SiC particles: sequentially carrying out surface oxidation treatment, acid washing, primary washing, alkali washing, secondary washing, drying and ball milling on the nano SiC particles to obtain pretreated nano SiC powder;

(2) weighing Al powder, Ti powder, C powder and the pretreated nano SiC powder obtained in the step (1) according to the proportion, then mixing and ball-milling the Al powder, the Ti powder, the C powder and the nano SiC powder, and pressing the ball-milled mixed powder into a pressing blank;

(3) heating the pressed blank obtained in the step (2) by using a laser under the protection of argon, enabling the pressed blank to generate a self-propagating reaction, and naturally cooling after the self-propagating reaction is finished; thus obtaining the Al-Ti-C-SiC composite material.

5. The method for producing an Al-Ti-C-SiC composite material according to claim 4, wherein: the surface oxidation treatment in the step (1) is specifically as follows: the nanometer SiC particles are roasted for 2 to 3 hours at the temperature of 1150 to 1200 ℃.

6. The method for producing an Al-Ti-C-SiC composite material according to claim 5, characterized in that: the acid washing in the step (1) is specifically as follows: and (3) pickling the nano SiC particles subjected to surface oxidation treatment in 4-5 vol% HF solution for 25-35 min.

7. The method for producing an Al-Ti-C-SiC composite material according to claim 6, characterized in that: the alkali washing in the step (1) is specifically as follows: and (3) putting the acid-washed nano SiC particles into a saturated NaoH solution at the temperature of 95-100 ℃ for treatment for 1.5-2.5 h.

8. The method for producing an Al-Ti-C-SiC composite material according to any one of claims 4 to 7, characterized in that: the mixed ball milling in the step (2) adopts vacuum ball milling, and specifically comprises the following steps: the ball-material ratio is 6:1-8:1, the rotating speed is 200r/min-300r/min, and the ball milling time is 1.5h-2.5 h.

9. The method for producing an Al-Ti-C-SiC composite material according to claim 8, characterized in that: the pressing blank in the step (3) is a cylindrical pressing blank, and the diameter of the cross section circle of the cylindrical pressing blank is 12 mm.

10. The method for producing an Al-Ti-C-SiC composite material according to claim 9, characterized in that: the purity of the Al powder used in the step (2) is 99%, and the granularity is less than 50 μm;

the purity of the Ti powder used in the step (2) is 99%, and the granularity is less than 50 μm;

the purity of the C powder used in the step (2) is 99.9%, and the granularity is less than 40 μm;

the purity of the nano SiC particles used in the step (1) is 99.9%, and the particle size is 40 nm.

Technical Field

The invention relates to a composite material, in particular to an Al-Ti-C-SiC composite material and a preparation method thereof.

Background

The ideal ingot structure is that the whole section of the ingot has uniform and fine equiaxed crystals, because the equiaxed crystals have small anisotropy, uniform deformation, excellent performance and good plasticity during processing, and are beneficial to casting and subsequent plastic processing. To obtain such a structure, it is generally necessary to subject the melt to a grain refining treatment, during which a refiner is required.

The fine TiC particles in the Al-Ti-C intermediate alloy have low aggregation tendency in an aluminum alloy melt, can avoid poisoning caused by elements such as Zr, Cr, Mn and the like, and is a refiner of the aluminum alloy material. However, subject to the conditions of the Al-Ti-C combustion reaction, Al preferentially exothermically reacts with Ti with slow heating. Increasing the temperature in the system, thereby increasing Al in the system₃And the content of Ti and TiC is low, so that the refining effect is not ideal when the Ti and TiC are added into the aluminum alloy material at the later stage.

The applicant has found that the prior art has at least the following technical problems:

1. the adiabatic temperature of the reaction is increased by reducing the Al content in the preparation process of the Al-Ti-C intermediate alloy so as to realize the normal operation of the reaction, but the Ti residue is caused, and the TiC content in the system is reduced;

2. the traditional radiation heating method in the process method can prolong the reaction time and generate adverse effects on the granularity and the shape of TiC particles;

3. when the Al-Ti-C intermediate alloy in the prior art is used as a refiner, the refining effect of the aluminum alloy material is not ideal.

Disclosure of Invention

The invention aims to provide an Al-Ti-C-SiC composite material and a preparation method thereof, and aims to solve the technical problem that the refining effect of an aluminum alloy material is not ideal when an Al-Ti-C intermediate alloy is used as a refiner in the prior art. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides an Al-Ti-C-SiC composite material which is prepared from the following raw materials in percentage by weight: al powder: 48% -53.3%; ti powder: 36% -40%; c, powder C: 6 to 6.7 percent; SiC powder: 2 to 10 percent; the sum of the weight percentages of the raw materials is 100 percent.

Further, the weight percentages of the raw materials are respectively as follows: al powder: 48% -51.7%; ti powder: 37% -39%; c, powder C: 6.1% -6.5%; SiC powder: 3% -10%; the sum of the weight percentages of the raw materials is 100 percent.

Further, the weight percentages of the raw materials are respectively as follows: al powder: 50.7 percent; ti powder: 38 percent; c, powder C: 6.3 percent; SiC powder: 5 percent.

The preparation method of the Al-Ti-C-SiC composite material provided by the invention comprises the following steps:

(1) pretreating the nano SiC particles: sequentially carrying out surface oxidation treatment, acid washing, primary washing, alkali washing, secondary washing, drying and ball milling on the nano SiC particles to obtain pretreated nano SiC powder;

(2) weighing Al powder, Ti powder, C powder and the pretreated nano SiC powder obtained in the step (1) according to the proportion, then mixing and ball-milling the Al powder, the Ti powder, the C powder and the nano SiC powder, and pressing the ball-milled mixed powder into a pressing blank;

(3) heating the pressed blank obtained in the step (2) by using a laser under the protection of argon, enabling the pressed blank to generate a self-propagating reaction, and naturally cooling after the self-propagating reaction is finished; thus obtaining the Al-Ti-C-SiC composite material.

Further, the surface oxidation treatment in the step (1) is specifically: the nanometer SiC particles are roasted for 2 to 3 hours at the temperature of 1150 to 1200 ℃.

Further, the acid washing in the step (1) is specifically as follows: and (3) pickling the nano SiC particles subjected to surface oxidation treatment in 4-5 vol% HF solution for 25-35 min.

Further, the alkali washing in the step (1) is specifically as follows: and (3) putting the acid-washed nano SiC particles into a saturated NaoH solution at the temperature of 95-100 ℃ for treatment for 1.5-2.5 h.

Further, the mixing ball milling in the step (2) adopts vacuum ball milling, specifically: the ball-material ratio is 6:1-8:1, the rotating speed is 200r/min-300r/min, and the ball milling time is 1.5h-2.5 h.

Further, the pressing blank in the step (3) is a cylindrical pressing blank, and the diameter of the cross section circle of the cylindrical pressing blank is 12 mm.

Further, the purity of the Al powder used in the step (2) is 99%, and the granularity is less than 50 μm;

the purity of the Ti powder used in the step (2) is 99%, and the granularity is less than 50 μm;

the purity of the C powder used in the step (2) is 99.9%, and the granularity is less than 40 μm;

the purity of the nano SiC particles used in the step (1) is 99.9%, and the particle size is 40 nm.

Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:

(1) according to the Al-Ti-C-SiC composite material provided by the invention, the prepared Al-Ti-C-SiC composite material contains nano SiC and fine TiC particles, and can be used in grain refinement treatment and modification treatment in the using process; the Al-Ti-C-10SiC and the Al-Ti-C composite material are diluted in equal proportion and then added into the Al-3Cu alloy, the grain sizes of the Al-Ti-C-10SiC and the Al-Ti-C composite material are 104 mu m and 136 mu m respectively, the grain refining effect of the Al-Ti-C-SiC is better, and the grain refining effect of the Al-Ti-C-SiC is better.

(2) The invention provides a preparation method of Al-Ti-C-SiC composite material, which comprises the steps of using laser ignition in the synthesis of Al-Ti-C-SiC composite material, using micron-sized TiC particles as main heterogeneous nucleation particles at the nucleation stage, adopting a laser self-propagating method, rapidly reaching the self-propagating reaction temperature, obviously shortening the self-heat storage process in the reaction process, improving the TiC content, using laser to ignite the material to be synthesized at high energy density through a specific medium (argon), then depending on the reaction heat released by the synthesis reaction to maintain the self-propagating reaction, and finally obtaining the required material, wherein the preparation method has the advantages that ① horizontally flowing high energy can be utilized, the energy can be guided to a determined temperature, the reaction process is controlled, ② transient ignition preheating and reaction time are favorable for obtaining fine TiC particles, and ③ ensures that SiC and Al-Ti-C react at high temperature to form the stable composite material.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a comparative XRD diffraction pattern of example 1, example 2 and comparative example 1 in the experimental examples of the present invention;

FIG. 2 is a scanning electron micrograph of a fracture of a sample obtained in example 1 of the experimental example of the present invention;

FIG. 3 is a scanning electron micrograph of a fracture of a sample obtained in example 2 of the experimental example of the present invention;

FIG. 4 is a scanning electron micrograph of a fracture in a sample obtained in comparative example 1 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Description of raw materials:

al powder: the purity is 99 percent, and the granularity is less than 50 mu m;

ti powder: the purity is 99 percent, and the granularity is less than 50 mu m;

c, powder C: the purity is 99.9 percent, and the granularity is less than 40 mu m;

nano SiC particles: the purity was 99.9% and the particle size was 40 nm.