CN112339365A

CN112339365A - Reinforced metal matrix and preparation method thereof, and metal complex and preparation method thereof

Info

Publication number: CN112339365A
Application number: CN202011283588.8A
Authority: CN
Inventors: 林颖菲; 冯晓伟; 路建宁; 王娟
Original assignee: Meizhou Yueke New Materials And Green Manufacturing Research Institute; Institute Of Materials And Processing Guangdong Academy Of Sciences
Current assignee: Meizhou Yueke New Materials And Green Manufacturing Research Institute; Institute Of Materials And Processing Guangdong Academy Of Sciences
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2021-02-09

Abstract

The invention relates to the technical field of composite materials, in particular to a reinforced metal matrix and a preparation method thereof, and a metal composite and a preparation method thereof. The invention provides a preparation method of a reinforced metal matrix, which comprises the following steps: mixing the silicon carbide reinforcement with silica sol to form a SiC slurry, and then attaching the SiC slurry to the surface of the metal body. The preparation method of the reinforced metal matrix is simple to operate, so that the interlayer interface combination of the metal complex formed subsequently is high, the metal complex is not easy to fall off, and the properties such as yield strength and tensile strength are excellent.

Description

Reinforced metal matrix and preparation method thereof, and metal complex and preparation method thereof

Technical Field

The invention relates to the technical field of composite materials, in particular to a reinforced metal matrix and a preparation method thereof, and a metal composite and a preparation method thereof.

Background

SiC has a series of advantages of high strength, high hardness, oxidation resistance, small thermal expansion coefficient, good fracture toughness, high temperature resistance and the like, and is an ideal choice for the metal composite material reinforcement. The metal composite material is a material compounded by two or more than two components with different performances through a special preparation processing method, and the characteristics of the components can be integrated through design, so that the metal composite material has excellent comprehensive performance incomparable to a single material. Therefore, the silicon carbide reinforcement is introduced into the metal composite material, so that the metal composite material is expected to obtain higher damage tolerance capability and good toughness matching, and the engineering application range of the metal composite material is fully expanded.

However, metal composite materials, particularly layered metal composite materials, are multilayered composite materials, and the layered metal composite materials formed by the layered metal composite materials have poor interface bonding, easy falling of interlayer structures, poor yield strength, poor tensile strength and other properties.

In view of this, the invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a reinforced metal matrix and a preparation method thereof, and a metal composite and a preparation method thereof. The preparation method of the reinforced metal matrix is simple to operate, so that the interlayer interface combination of the metal complex formed subsequently is high, the metal complex is not easy to fall off, and the properties such as yield strength and tensile strength are excellent.

The invention is realized by the following steps:

in a first aspect, the present invention provides a method for preparing a reinforced metal matrix, comprising: mixing the silicon carbide reinforcement with silica sol to form a SiC slurry, and then attaching the SiC slurry to the surface of the metal body.

In an alternative embodiment, forming the SiC slurry comprises: mixing and stirring the silicon carbide reinforcement and the silica sol and performing ultrasonic treatment;

preferably, the power of the ultrasonic wave is 200-;

preferably, the mass ratio of the silicon carbide to the silica sol is 1: 1-4;

preferably, the silica sol is a silica sol having a solid content of silica of 20 to 40%.

In an alternative embodiment, the silicon carbide reinforcement is decontaminated prior to forming the SiC slurry;

preferably, the step of removing impurities comprises: mixing the silicon carbide reinforcement with an acid solution for reaction, then filtering, and washing and drying a filter cake obtained by filtering;

preferably, the silicon carbide reinforcement is in the form of at least one of particles, whiskers, and nanowires;

preferably, the particles have an average particle size of 0.3 to 10 microns, the whiskers have a diameter of 0.1 to 1 micron and a length of 20 to 50 microns, and the nanowires have a diameter of 0.05 to 0.5 micron and a length of 50 to 100 microns;

preferably, the silicon carbide reinforcement is selected from at least one of 3C, 2H, 4H and 6H.

In an alternative embodiment, the metal body is an aluminum metal body, preferably an aluminum metal foil, preferably a pure aluminum foil or an aluminum alloy foil;

preferably, the thickness of the metal body is 0.05-2 mm.

In an alternative embodiment, the metal body is pre-treated before the SiC slurry is attached to the metal body;

preferably, the step of pre-treating comprises: sequentially carrying out oil removal, oxide film removal and surface roughening treatment;

preferably, the step of removing oil comprises: soaking the metal body in an organic solvent for ultrasonic treatment, and then drying;

preferably, the power of the ultrasound is 200-;

preferably, the step of removing the oxide film includes: mixing and soaking the deoiled metal body with an alkali solution, and then drying;

preferably, the time for mixing the aqueous alkali with the aqueous alkali is 2-10 minutes, the temperature is 50-60 ℃, and the mass concentration of the aqueous alkali is 8-10%;

preferably, the surface roughening treatment includes: and polishing the metal body with the oxide film removed.

In an alternative embodiment, the method of attaching the SiC slurry to the surface of the metal body includes: any one of spraying, rolling and brushing;

preferably, the SiC slurry is attached to the metal body by air spraying;

preferably, the air spraying pressure is 0.2-0.8MPa, the spraying distance is 100-400mm, and the spraying times are 2-10.

In a second aspect, the present invention provides a reinforced metal matrix obtained by the method of preparing a reinforced metal matrix according to any one of the preceding embodiments, the reinforced metal matrix having a thickness of 0.06 to 2.1 mm; the thickness of the connecting layer formed by the SiC slurry is 10-100 microns. In a third aspect, the present invention provides a metal composite comprising at least 2 of the reinforced metal matrices provided in the previous embodiments, each of the reinforced metal matrices being connected in series, and a connection layer formed of SiC slurry being provided spaced apart from the metal body.

In a fourth aspect, the present invention provides a method of preparing a metal composite body, comprising: sequentially stacking the reinforced metal matrixes to form a composite blank, and then hot rolling; and the connecting layer formed by the SiC slurry in the blank body is arranged at intervals with the metal body.

In an alternative embodiment, the step of hot rolling comprises: preheating the composite blank, and then carrying out rolling deformation treatment;

preferably, the temperature of preheating is 250-500 ℃; the time is 10-30 min;

preferably, the rolling deformation treatment is multi-pass hot rolling;

preferably, the temperature of each hot rolling is 250-500 ℃, the heat preservation time is 10-30min, the rotating speed of a roller is 15-20r/min, and the hot rolling reduction is 20-50%;

preferably, the deformation range of the rolling deformation treatment is 20-80%;

preferably, the preparation method further comprises the steps of: straightening, trimming and surface polishing are sequentially carried out after rolling deformation treatment;

preferably, the ends of the composite body are fixed prior to hot rolling;

preferably, the ends of the composite body are fixed by riveting prior to hot rolling.

The embodiment of the invention has the following beneficial effects: (1) the silica sol can uniformly adsorb the silicon carbide reinforcement, so that the silicon carbide reinforcement is strongly attached to the metal body, the performance of the metal body by the silicon carbide reinforcement is promoted, the performance of a metal composite formed by subsequent hot rolling can also be promoted, each layer in the metal composite is not easy to fall off, and the silicon carbide reinforcement has excellent yield strength, tensile strength and the like.

(2) The silica sol has certain anti-fouling capability, so that when the silicon carbide reinforcement is attached to the metal body, impurities such as dust in the environment can be prevented from being attached to the surface of the metal body, and the silica sol can also be used as an oxygen insulator to prevent metal oxides such as aluminum oxide from being produced in the subsequent hot rolling process.

(3) Furthermore, the silica sol forms Si-O bond after drying, has certain bonding strength, and can effectively avoid the possibility of interlayer sliding displacement in the subsequent hot rolling process. The film-forming shrinkage volume of the silica sol is large, so that a certain A1-Al bonding area is reserved after the silica sol in the SiC slurry is air-dried and formed into a film, the subsequent hot rolling process is facilitated, and the performance of the formed metal complex is ensured.

(4) The preparation method of the reinforced metal matrix can realize the controllable introduction of the multi-specification and multi-form silicon carbide reinforcement, wherein the silicon carbide reinforcement is embedded into the metal body, the formed SiC thin layer is of a quasi-continuous structure and is well combined with the interface of the metal body, and then the shape and the structure, such as the thickness, of the metal complex are easy to control by hot rolling the reinforced metal matrix.

(5) Meanwhile, compared with the preparation method of the layered metal complex in the prior art, the preparation method of the metal complex provided by the embodiment of the invention reduces the preparation process of the complex body and simplifies the process flow.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a flow chart of a process for preparing a metal composite according to example 1 of the present invention;

FIG. 2 is a microstructure diagram of a metal composite provided in example 1 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

The embodiment of the invention provides a preparation method of a reinforced metal matrix, which comprises the following steps:

s1, removing impurities from the silicon carbide reinforcement;

mixing the silicon carbide reinforcement with an acid solution for reaction, reacting impurities such as metallic iron, ferric oxide, magnesium, aluminum and the like in the silicon carbide reinforcement with the acid solution, and then removing the impurities, wherein the adopted acid solution can be a hydrochloric acid solution or a sulfuric acid solution, or other acid solutions capable of reacting with metal and metal oxide in the prior art. The mass concentration of the acid solution is 8-12%.

Specifically, mixing and stirring a silicon carbide reinforcement and an acid solution, standing and soaking, then filtering, and washing and drying a filter cake obtained by filtering; wherein the stirring speed is 200-500r/min, the stirring time is 10-30min, then the standing soaking time is 1-3h, the washing time is 1-2h, the drying temperature is 60-80 ℃ during drying, and the drying time is 30min-2 h. By adopting the process and the conditions, impurities contained in the silicon carbide reinforcement can be fully removed, so that the purity of the silicon carbide reinforcement for subsequently forming SiC slurry is improved by filtering, the performance of the SiC slurry is improved, and finally the performance of the metal composite is improved.

Secondly, the form of the silicon carbide reinforcement is at least one of particles, whiskers and nanowires; wherein the average particle size of the particles is 0.3-10 microns, the diameter of the whiskers is 0.1-1 micron, the length of the whiskers is 20-50 microns, the diameter of the nanowires is 0.05-0.5 micron, and the length of the nanowires is 50-100 microns; specifically, the silicon carbide reinforcement is selected from at least one of 3C, 2H, 4H, and 6H.

It is understood that the purging operation may not be performed if the purity of the silicon carbide reinforcement employed is satisfactory or if the impurities contained therein do not affect the properties of the subsequent SiC slurry, the reinforcement metal matrix, and the metal composite.

S2, preprocessing the metal body;

sequentially carrying out oil removal, oxide film removal and surface roughening treatment on the metal body; and then the combination effect of the metal body and the subsequent SiC sizing agent is improved, and the performance of the reinforced metal matrix and the metal complex is improved.

Specifically, the metal body is soaked in an organic solvent for ultrasonic treatment and then dried; wherein the power of the ultrasonic wave is 200-400W, and the time of the ultrasonic wave is 10-30 min; the organic solvent can be acetone, ethanol, methanol and other alcohol solvents or other organic solvents.

Then mixing and soaking the deoiled metal body with an alkaline solution, removing an oxide film on the surface of the metal body, washing with deionized water, washing out substances such as residual alkali on the surface of the metal body and the oxide film after reaction, and drying; wherein the time for mixing with the alkali solution is 2-10 minutes, the temperature is 50-60 ℃, and the mass concentration of the alkali solution is 8-10%; the adopted alkaline solution is a mixed solution formed by mixing a substance capable of forming an alkaline environment with water, the substance can be selected from sodium hydroxide, potassium hydroxide, sodium oxide, sodium peroxide and the like, and the deionized water washing time is 20min-1 h.

And then, polishing the metal body without the oxide film, specifically, polishing and roughening the metal body by using a steel wire brush, wherein the direction of the stripes formed by polishing is vertical to the direction of subsequent rolling, so that the performance of the subsequently formed metal composite is excellent.

Further, the metal body is an aluminum metal body, preferably an aluminum metal foil, preferably a pure aluminum foil or an aluminum alloy foil; the thickness of the metal body is 0.05-2 mm. The thickness of injecing the metal body can guarantee follow-up metal complex's formation, and guarantees that each layer reinforcing metal matrix in the metal complex, the metal body and the connecting layer that the SiC thick liquids formed etc. are difficult for droing, guarantees metal complex's performance then.

Note that, S1 and S2 do not represent a single step sequence, and S2 may be performed first and S1 may be performed later, or S1 and S2 may be performed simultaneously.

S3, preparing SiC slurry;

the silicon sol adopted in the embodiment of the invention is nontoxic, large in specific surface area and strong in adsorption force, so that the silicon carbide reinforcement and the metal body have good bonding effect, and meanwhile, the silicon sol can be used as an oxygen-isolating agent to avoid forming an oxidation film in the subsequent formation of a metal complex, for example, the reinforced metal matrix made of aluminum foil is prevented from forming Al by hot rolling₂O₃. Meanwhile, the silica sol forms Si-O bond after drying, has certain bonding strength, and can effectively avoid the possibility of displacement between the reinforced metal matrixes or between the metal body and the SiC slurry forming connecting layer in the subsequent hot rolling process. And the film-forming shrinkage volume of the silica sol is larger, so that a certain A1-Al bonding area is reserved after the silica sol in the SiC slurry is air-dried and formed into a film, and the hot rolling compounding of the metal matrix is enhanced. The silica sol uniformly adsorbs SiC, and plays a certain role in dispersing the silicon carbide reinforcement; the silica sol also has certain anti-pollution capability, and when the SiC sizing agent is attached to the metal body, impurities such as micro-dust and the like in the environment can be effectively prevented from covering the surface of the metal body.

Specifically, the silicon carbide reinforcement is mixed with the silica sol and stirred and ultrasonically treated; wherein the power of the ultrasonic wave is 200-; by adopting the conditions, the uniform mixing of all substances in the SiC slurry can be ensured, so that the dispersion of the silicon sol into the silicon carbide reinforcement is facilitated, and the effect of the silicon carbide reinforcement and the metal body is facilitated.

The mass ratio of the silicon carbide to the silica sol is 1: 1-4; the silica sol is silica sol with the solid content of 20-40% of silicon dioxide, and the SiC slurry prepared by adopting the silica sol with the content and the proportion can be beneficial to improving the performance of a reinforced metal matrix and further improving the performance of a metal composite.

S4, attaching the SiC slurry to the surface of the metal body;

and then attaching the SiC slurry to the surface of the metal body, specifically, attaching the SiC slurry to the metal body by air spraying, wherein the air spraying pressure is 0.2-0.8MPa, the spraying distance is 100-400mm, and the spraying frequency is 2-10 times. The SiC slurry is attached to the surface of the metal body and then dried, and then a connection layer is formed on the metal body. In addition to the above spraying, the SiC slurry may be attached to the surface of the metal body by means of a roll, brush, or the like.

The embodiment of the invention also provides a reinforced metal matrix, which is prepared by the preparation method, wherein the thickness of the reinforced metal matrix is 0.06-2.1 mm; the thickness of the connecting layer formed by the SiC slurry is 10-100 microns.

In this case, the thicknesses of the reinforcing metal matrix and the connection layer are the thicknesses of the connection layer and the reinforcing metal matrix after drying without rolling, that is, after spraying the SiC slurry. When the metal composite is prepared subsequently, rolling is needed, the thicknesses of the connecting layer and the reinforced metal matrix are reduced during rolling, generally, the thickness of the connecting layer after rolling is 5-40 micrometers, and the thickness of the reinforced metal matrix is 0.03-1 millimeter.

The embodiment of the invention also provides a metal composite body which comprises at least 2 reinforced metal substrates, wherein each reinforced metal substrate is connected in sequence, and a connecting layer formed by SiC slurry is arranged at intervals with the metal substrate. Namely, the connection mode of two adjacent reinforced metal matrixes is that the connection layer of one reinforced metal matrix is connected with the metal body of the other reinforced metal matrix. And the content of SiC in the metal composite is 2-10%.

The embodiment of the invention also provides a preparation method of the metal composite, which comprises the following steps:

and sequentially laminating the reinforced metal substrates to form a composite blank, wherein a connecting layer formed by the SiC slurry in the composite blank is arranged at intervals with the metal body. And then, fixing the end part of the composite blank, so that the movement of the laminated reinforced metal matrix is prevented in the subsequent hot rolling process, and the performance of the formed metal composite is ensured.

The end of the composite blank may be riveted or otherwise secured as disclosed in the prior art.

Then, hot rolling is carried out; specifically, the step of hot rolling comprises: preheating the composite blank, and then carrying out rolling deformation treatment; and the rolling deformation treatment is multi-pass hot rolling; wherein the preheating temperature is 250-500 ℃; the time is 10-30 min; the temperature of each hot rolling is 250-; the deformation range of the rolling deformation treatment is 20-80%. By adopting the conditions for hot rolling, each or each layer of reinforced metal matrix can be ensured to have good effect, and then the metal complex is ensured to be not easy to fall off among all layers (among the reinforced metal matrixes, between the metal body and the connecting layer in the reinforced metal matrix) and to have good performance.

And after rolling deformation treatment, straightening, trimming and surface polishing are sequentially carried out, and then the metal composite is obtained.

The features and properties of the present invention are described in further detail below with reference to examples.

Example 1

Referring to fig. 1, the present embodiment provides a method for preparing a metal composite body, including the steps of:

firstly, removing impurities from a silicon carbide reinforcement:

placing the silicon carbide reinforcement in sulfuric acid washing liquor, stirring and soaking, then washing and drying by using deionized water, removing impurities such as metallic iron, ferric oxide, magnesium, aluminum and the like in SiC, and finishing impurity removal of the silicon carbide reinforcement;

the silicon carbide reinforcement is in the form of particles, the average particle size of the particles is 5 microns, and the silicon carbide reinforcement is made of 3C-SiC particles. The mass concentration of sulfuric acid washing liquor for removing impurities from the silicon carbide reinforcement is 12%; stirring at 300r/min for 20 min; pickling and soaking for 2 h; the washing time of the deionized water is 1h, the drying temperature after washing is 80 ℃, and the drying time is 30 min.

Secondly, preparing SiC slurry:

and (3) mixing the silicon carbide reinforcement subjected to impurity removal treatment in the step one with silica sol to obtain mixed slurry, and performing ultrasonic dispersion and stirring homogenization on the mixed slurry to obtain SiC slurry.

The mass ratio of the silicon carbide reinforcement body to the silica sol in the SiC slurry is 1: 3; the silica sol is SiO with the solid content of 30 percent₂Silica sol; the ultrasonic power during ultrasonic dispersion is 400W, and the ultrasonic dispersion time is 10 min; the stirring speed is 300r/min, and the stirring time is 3 h.

Thirdly, aluminum foil surface treatment:

the aluminum foil is placed in absolute ethyl alcohol for ultrasonic soaking to remove oil stains, then natural drying is carried out, then the aluminum foil is placed in sodium hydroxide alkali washing liquor, heat preservation is carried out for 2min at 55 ℃, impurities and natural oxidation films on the surface of the aluminum foil are removed, then deionized water washing and natural air drying are carried out, then the aluminum foil cleaned and subjected to impurity removal is subjected to polishing and roughening treatment by a steel wire brush, the direction of formed polishing stripes is perpendicular to the rolling direction of subsequent hot rolling, and a clean and rough surface to be compounded is obtained.

The aluminum metal foil is pure aluminum, and the thickness of the foil is 0.5 mm; the ultrasonic power is 300W, and the ultrasonic soaking time is 20 min; the concentration of the sodium hydroxide alkaline washing liquor is 10 percent; the deionized water rinsing time is 30 min.

Fourthly, coating the slurry:

coating the SiC slurry on the surface to be compounded of the aluminum metal foil in an air spraying mode; the air spraying pressure is 0.5MPa, the spraying distance is 300mm, and the spraying times are 4.

Fifthly, combining and laminating:

and (3) stacking the aluminum metal foils coated with the SiC sizing agent for 8 layers to obtain a composite blank, and riveting and fixing two sides of the end part of the composite blank by using an aluminum rivet to obtain a combined layered pre-rolled blank.

Sixthly, hot rolling and compounding:

and (2) putting the combined layered pre-rolled blank into a muffle furnace to be preheated for 15min at the heating temperature of 350 ℃, performing rolling deformation treatment by adopting a double-roller mill, wherein the deformation range is 50%, and then performing straightening, trimming and surface polishing to obtain a metal complex, namely the aluminum-based layered hot-rolled composite material.

The hot rolling composite rolling deformation treatment is three times of hot rolling, the heating temperature of each hot rolling is 350 ℃, the heat preservation time is 15min, the rotating speed of a roller is 15r/min, the hot rolling reduction of the first pass and the second pass is 25%, and the hot rolling reduction of the third pass is 20%.

The aluminum-based layered composite material prepared in the embodiment has the density of 2.73g/cm through detection³The content of the silicon carbide reinforcement is 4 percent, the yield strength is 130MPa, the tensile strength is 170MPa, the elongation after fracture is 25 percent, and the silicon carbide reinforcement does not have fracture or fracture after bending testInterlayer debonding or peeling phenomena. Fig. 2 is a microstructure picture of the aluminum-based layered composite material prepared in example 1, in fig. 2, a is an aluminum metal layer, B is a connection layer of a silicon carbide reinforcement, and it can be seen that the connection layer and the aluminum metal layer are alternately arranged and have a layered structure. The thickness of the connecting layer before rolling is 25 micrometers, the thickness of the reinforced base body before rolling is 0.525 millimeters, the thickness of the connecting layer after rolling is 10-15 micrometers, the thickness of the reinforced metal base body after rolling is 160-200 micrometers, and the thickness of the metal composite body is 2 millimeters.

Example 2

The present embodiment provides a method for preparing a metal composite, including the steps of:

firstly, removing impurities from a silicon carbide reinforcement:

the silicon carbide reinforcement is placed in sulfuric acid washing liquor, stirred and soaked, and then washed and dried by deionized water. The silicon carbide reinforcement is in the form of whiskers, the diameter of the silicon carbide reinforcement is 0.1-1 micrometer, the length of the silicon carbide reinforcement is 20-50 micrometers, and the silicon carbide reinforcement is made of a 3C and 2H SiC whisker combination. The concentration of the sulfuric acid washing liquor is 10 percent; the pickling stirring speed is 300r/min, and the stirring time is 30 min; pickling and soaking for 1.5 h; the washing time of the deionized water is 0.5h, the drying temperature after washing is 70 ℃, and the drying time is 1 h.

Secondly, preparing SiC slurry:

The mass ratio of the silicon carbide reinforcement body to the silica sol in the SiC slurry is 1: 2; the silica sol is SiO with the solid content of 40 percent₂Silica sol; the ultrasonic power during ultrasonic dispersion is 300W, and the ultrasonic dispersion time is 20 min; the stirring speed for stirring homogenization is 500r/min, and the stirring time is 2 h.

Thirdly, aluminum foil surface treatment:

the aluminum foil is placed in absolute ethyl alcohol for ultrasonic soaking, then natural drying is carried out, then the aluminum foil is placed in sodium hydroxide alkaline washing liquor, the temperature is kept at 60 ℃ for soaking for 2min, then deionized water washing and natural air drying are carried out, then the aluminum foil cleaned and subjected to impurity removal is subjected to polishing and roughening treatment by a steel wire brush, the direction of formed polishing stripes is perpendicular to the rolling direction, and a clean and rough surface to be compounded is obtained.

The aluminum metal foil is pure aluminum, and the thickness of the foil is 0.5 mm; the ultrasonic power of ultrasonic soaking is 400W, and the ultrasonic soaking time is 10 min; the mass concentration of the sodium hydroxide alkaline washing liquid is 8 percent; the deionized water washing time is 1 h.

Fourthly, coating the slurry:

coating the SiC slurry on the surface to be compounded of the aluminum metal foil in an air spraying mode; the air spraying pressure is 0.8MPa, the spraying distance is 400mm, and the spraying times are 4.

Fifthly, combining and laminating:

and (3) stacking the aluminum metal foils coated with the SiC sizing agent for 10 layers to obtain a composite blank, and riveting and fixing two sides of the end part of the composite blank by using an aluminum rivet to obtain a combined layered pre-rolled blank.

Sixthly, hot rolling and compounding:

and (2) putting the combined layered pre-rolled blank into a muffle furnace to be preheated for 10min at the heating temperature of 400 ℃, performing rolling deformation treatment by adopting a double-roller mill, wherein the deformation range is 60%, and then performing straightening, trimming and surface grinding to obtain the aluminum-based layered hot-rolled composite material, namely the metal composite.

The hot rolling composite rolling deformation treatment is three times of hot rolling, the heating temperature of each hot rolling is 400 ℃, the heat preservation time is 10min, the rotating speed of a roller is 20r/min, the hot rolling reduction of the first pass and the second pass is 30%, and the hot rolling reduction of the third pass is 20%.

The aluminum-based layered composite material prepared in the embodiment has a density of 2.74g/cm through detection³The content of the silicon carbide reinforcement is 8 percent, the yield strength is 140MPa, the tensile strength is 180MPa, the elongation after fracture is 20 percent, and the silicon carbide reinforcement does not fracture or delaminate after a bending test. The thickness of the connecting layer before rolling is 30 microns, the thickness of the reinforced matrix before rolling is 0.53 mm, the thickness of the connecting layer after rolling is 10-15 microns, the thickness of the reinforced metal matrix after rolling is 130-160 microns, and the thickness of the metal composite body is 160 micronsThe degree is 1.6 mm.

Example 3

firstly, removing impurities from a silicon carbide reinforcement:

placing the silicon carbide reinforcement in a sulfuric acid washing solution, stirring, soaking, and then washing and drying with deionized water; the silicon carbide reinforcement is in the form of nanowires, the diameter of the silicon carbide reinforcement is 0.05-0.5 micrometer, the length of the silicon carbide reinforcement is 50-100 micrometers, and the silicon carbide reinforcement is made of a 3C and 2H SiC nanowire combination. The mass concentration of the sulfuric acid washing liquor is 12 percent; stirring at 200r/min for 30 min; pickling and soaking for 1 h; the washing time of the deionized water is 1.5h, the drying temperature after washing is 60 ℃, and the drying time is 2 h.

Secondly, preparing SiC slurry:

and (3) mixing the silicon carbide reinforcement subjected to impurity removal treatment in the step one with silica sol to obtain mixed slurry, and performing ultrasonic dispersion and stirring homogenization on the mixed slurry to obtain SiC slurry. Wherein the mass ratio of the silicon carbide reinforcement body to the silica sol in the SiC slurry is 1: 4; the silica sol is SiO with the solid content of 20 percent₂Silica sol; the ultrasonic power during ultrasonic dispersion is 400W, and the ultrasonic dispersion time is 20 min; the stirring speed for stirring and homogenizing is 700r/min, and the stirring time is 3 h.

Thirdly, aluminum foil surface treatment:

the aluminum foil is placed in absolute ethyl alcohol for ultrasonic soaking to remove oil stains, then natural drying is carried out, then the aluminum foil is placed in sodium hydroxide alkaline washing liquor, heat preservation is carried out for 2min, impurities and natural oxidation films on the surface of the aluminum foil are removed, then deionized water washing and natural air drying are carried out, then a steel wire brush is adopted to carry out polishing and roughening treatment on the aluminum foil after being cleaned and removed, the direction of formed polishing stripes is perpendicular to the rolling direction, and a clean and rough surface to be compounded is obtained. Wherein the aluminum metal foil is 6063 aluminum alloy, and the thickness of the foil is 0.5 mm; the aluminum metal foil subjected to the surface treatment of the aluminum foil is placed in absolute ethyl alcohol for ultrasonic soaking, the ultrasonic power is 300W, and the ultrasonic soaking time is 20 min; the concentration of sodium hydroxide alkaline washing liquor of the aluminum metal foil is 10 percent; and the deionized water washing time of the aluminum metal foil is 40 min.

Fourthly, coating the slurry:

coating the SiC slurry on the surface to be compounded of the aluminum metal foil in an air spraying mode; the air spraying pressure is 0.6MPa, the spraying distance is 300mm, and the spraying frequency is 8;

fifthly, combining and laminating:

and (3) stacking the aluminum metal foils coated with the SiC slurry for 8 layers to obtain a composite blank, and riveting and fixing two sides of the end part of the composite blank by using aluminum rivets to obtain a combined layered pre-rolled blank.

Sixthly, hot rolling and compounding:

and (3) putting the combined layered pre-rolled blank into a muffle furnace to preheat for 20min at the heating temperature of 300 ℃, performing rolling deformation treatment by adopting a double-roller mill, wherein the deformation range is 50%, and then performing straightening, trimming and surface grinding to obtain the aluminum-based layered hot-rolled composite material.

The hot rolling composite rolling deformation treatment is three times of hot rolling, the heating temperature of each hot rolling is 300 ℃, the heat preservation time is 10min, the rotating speed of a roller is 20r/min, the hot rolling reduction of the first pass and the second pass is 25%, and the hot rolling reduction of the third pass is 20%.

The aluminum-based layered composite material prepared in the embodiment has a density of 2.74g/cm through detection³The content of the silicon carbide reinforcement is 5 percent, the yield strength is 220MPa, the tensile strength is 280MPa, the elongation after fracture is 22 percent, and the silicon carbide reinforcement does not fracture or delaminate after a bending test. The thickness of the connecting layer before rolling is 50 micrometers, the thickness of the reinforced matrix before rolling is 0.55 mm, the thickness of the connecting layer after rolling is 20-30 micrometers, the thickness of the reinforced metal matrix after rolling is 160-200 micrometers, and the thickness of the metal composite is 2.1 mm.

Comparative example 1 a metal composite was prepared according to the method for preparing a metal composite provided in example 1, except that the silica sol was replaced with a thermosetting phenol resin, the other operation steps and conditions were not changed, and the metal composite was likely to undergo interlayer peeling and interlayer bonding after rolling.

Comparative example 2: a metal composite was prepared by referring to the method for preparing a metal composite provided in example 1, except that the silica sol was replaced with a mixture of a thermosetting phenol resin and a silica sol in a ratio of 1:1, the other operation steps and conditions were not changed, and the density of the metal composite after the examination was 2.73g/cm³The content of the silicon carbide reinforcement is 4%, the yield strength is 70MPa, the tensile strength is 100MPa, the elongation after fracture is 10%, and the interlayer debonding phenomenon occurs locally after fracture after a bending test.

Comparative example 3: a metal composite was prepared by referring to the method for preparing a metal composite provided in example 1, except that the mass ratio of silicon carbide to the silica sol was 1:10, the other operation steps and conditions were not changed, and the density of the metal composite after the detection was 2.74g/cm³The content of the silicon carbide reinforcement is 4 percent, the yield strength is 90MPa, the tensile strength is 120MPa, the elongation after fracture is 20 percent, no fracture and interlayer debonding or peeling phenomena exist after a bending test, but the comprehensive mechanical property is lower.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method of preparing a reinforced metal matrix, comprising: mixing the silicon carbide reinforcement with silica sol to form a SiC slurry, and then attaching the SiC slurry to the surface of the metal body.

2. The method of preparing a reinforced metal matrix according to claim 1, wherein forming the SiC slurry comprises: mixing and stirring the silicon carbide reinforcement and the silica sol and performing ultrasonic treatment;

preferably, the power of the ultrasonic wave is 200-;

preferably, the mass ratio of the silicon carbide to the silica sol is 1: 1-4;

3. The method of claim 1, wherein prior to forming the SiC slurry, the silicon carbide reinforcement is decontaminated;

4. The method for the preparation of a reinforced metal matrix according to any of claims 1 to 3, wherein the metal body is an aluminium metal body, preferably an aluminium metal foil, preferably a pure aluminium foil or an aluminium alloy foil;

preferably, the thickness of the metal body is 0.05-2 mm.

5. The method of preparing a reinforced metal matrix according to any of claims 1 to 3, wherein the metal body is pretreated before the SiC slurry is attached to the metal body;

preferably, the power of the ultrasound is 200-;

6. The method of preparing a reinforced metal matrix according to any of claims 1 to 3, wherein the method of attaching the SiC slurry to the surface of the metal body comprises: any one of spraying, rolling and brushing;

preferably, the SiC slurry is attached to the metal body by air spraying;

7. A reinforced metal matrix obtained by the method for producing a reinforced metal matrix according to any one of claims 1 to 6,

preferably, the thickness of the reinforced metal matrix is 0.06-2.1 mm;

preferably, the SiC slurry forms a connecting layer having a thickness of 10-100 microns.

8. A metal composite comprising at least 2 reinforced metal substrates according to claim 7, each of said reinforced metal substrates being connected in series and a connecting layer of SiC slurry being provided spaced apart from the metal body;

preferably, the content of SiC in the metal composite is 2 to 10%.

9. A method of making a metal composite, comprising: sequentially stacking the reinforced metal matrixes to form a composite blank, and then hot rolling; and the connecting layer formed by the SiC sizing agent in the composite blank body is arranged at intervals with the metal body.

10. The method of claim 9, wherein the step of hot rolling comprises: preheating the composite blank, and then carrying out rolling deformation treatment;

preferably, the rolling deformation treatment is multi-pass hot rolling;

preferably, the temperature of each hot rolling is 250-;

preferably, the ends of the composite body are fixed prior to hot rolling;