A method for preparing a SiC fiber reinforced copper alloy matrix composite by vacuum hot pressing

Abstract

The application belongs to the technical field of metal matrix composites, and particularly discloses a method for preparing SiC fiber reinforced copper alloy composite material by vacuum hot pressing, which comprises the following steps: (1) preparing as-cast copper alloy, hot rolling the as-cast copper alloy into sheet-shaped copper alloy material, and cutting the sheet-shaped copper alloy material into several pieces according to requirements; (2) stacking the several sheet-shaped copper alloy materials, laying a layer of SiC fibers between two adjacent sheet-shaped copper alloy materials, and obtaining multilayer sheet-shaped copper alloy material containing SiC fibers; (3) vacuum hot pressing the prepared multilayer sheet-shaped copper alloy material containing SiC fibers, and obtaining SiC fiber reinforced copper alloy composite material; and (4) annealing and heat treating the SiC fiber reinforced copper alloy composite material. The SiC fibers with excellent comprehensive performance are introduced into the copper alloy material as the reinforcing phase, and the SiC fibers and the copper alloy matrix are combined well. The SiC fiber reinforced copper alloy composite material has good mechanical properties, and the process is simple, the cost is low, and the SiC fiber reinforced copper alloy composite material has a wide application prospect.

Description

Technical Field

[0001] This invention belongs to the field of metal matrix composite technology, specifically relating to a method for preparing SiC fiber-reinforced copper alloy composites using vacuum hot pressing. Background Technology

[0002] Copper alloys are widely used in electronics, power, aerospace, and transportation due to their excellent electrical and thermal conductivity, ductility, corrosion resistance, and low cost. However, with the rapid development of science and technology, modern industry requires copper alloys to possess better mechanical properties in addition to their existing performance characteristics to meet the requirements of various high-tech fields.

[0003] Introducing reinforcing phases into copper alloys to form copper alloy matrix composites is an effective method to improve the performance of copper alloys. Currently, the reinforcing phases used mainly include SiC particles, carbon nanotubes, and SiO2 particles. Among them, SiC fiber is a high-performance ceramic fiber with advantages such as high strength, stiffness, and modulus, low density, small coefficient of thermal expansion, and good corrosion resistance. It has been successfully applied in aluminum-based, nickel-based, and titanium-based metal matrix composites, which can significantly enhance the comprehensive performance of the materials. However, to date, SiC fiber, as a high-performance reinforcing phase, has rarely been used in copper alloy matrix composites. The main reasons are as follows: the coefficients of thermal expansion of copper alloys and SiC fibers are mismatched. Copper alloys have a large coefficient of thermal expansion, while SiC fibers have a small coefficient of thermal expansion. This mismatch may lead to problems such as cracking of the composite material at high temperatures; there is a chemical reaction between copper alloys and SiC fibers. Copper is easily oxidized at high temperatures, while SiC fibers form oxidized SiC particles under the action of strong oxidizing agents such as nitric acid. Inappropriate chemical reactions may occur between the two; the interfacial bond strength between SiC fibers and copper alloys is low. The bond strength between SiC fibers and copper alloys is relatively low, making them prone to cracking at the interface. Therefore, the application of SiC fibers in copper alloy-based composites faces several technical challenges. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the existing technology and provide a method for preparing SiC fiber reinforced copper alloy composite materials using vacuum hot pressing technology. By combining SiC fibers with copper alloys through vacuum hot pressing, SiC fiber reinforced copper alloy matrix composite materials are prepared, which successfully improves the mechanical properties of the materials and has very important theoretical significance and broad application prospects.

[0005] To achieve the above objectives, one of the technical solutions of the present invention is: a method for preparing SiC fiber-reinforced copper alloy composite materials using vacuum hot pressing technology, comprising the following steps:

[0006] (1) Prepare cast copper alloy, hot roll the cast copper alloy into sheet copper alloy material, and then cut it into several sheet copper alloy materials as needed;

[0007] (2) Stack several sheets of copper alloy material, and lay a layer of SiC fiber between two adjacent sheets of copper alloy material to obtain a multilayer sheet of copper alloy material containing SiC fiber.

[0008] (3) The multilayer sheet copper alloy material containing SiC fibers obtained in step (2) is vacuum hot-pressed to obtain SiC fiber reinforced copper alloy composite material.

[0009] (4) The SiC fiber reinforced copper alloy composite material in step (3) is subjected to annealing heat treatment.

[0010] In a preferred embodiment of the present invention, the cast copper alloy in step (1) comprises, by weight percentage: 57-73 wt% copper, 20-32 wt% zinc, 4-8 wt% aluminum, and 2-4 wt% iron.

[0011] In a preferred embodiment of the present invention, the hot rolling temperature in step (1) is 850-950°C.

[0012] In a preferred embodiment of the present invention, the thickness of the hot-rolled sheet copper alloy material in step (1) is 0.5-1 mm, and the number of sheets cut is 2-5.

[0013] In a preferred embodiment of the present invention, the number of layers of the multilayer sheet copper alloy material in step (2) is 2-5.

[0014] In a preferred embodiment of the present invention, the SiC fibers in step (2) account for 1-5 wt% of the weight of the multilayer sheet copper alloy material.

[0015] In a preferred embodiment of the present invention, the vacuum hot pressing temperature in step (3) is 850-950℃, the hot pressing pressure is 20-60MPa, the hot pressing time is 1-6h, and the heating rate is 5-10℃ / min.

[0016] In a preferred embodiment of the present invention, the annealing heat treatment temperature in step (4) is 850-950°C and the annealing heat treatment time is 24-48h.

[0017] To achieve the above objectives, the second technical solution of the present invention is: a SiC fiber reinforced copper alloy composite material prepared by the above-mentioned method of preparing SiC fiber reinforced copper alloy composite material using vacuum hot pressing technology.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This invention successfully introduces SiC fibers with excellent comprehensive performance as a reinforcing phase into copper alloy materials, and the SiC fibers and copper alloy matrix are well bonded.

[0020] 2. The SiC fiber-reinforced copper alloy composite material prepared by this invention has good mechanical properties, and the process is simple and low-cost, with broad application prospects. Attached Figure Description

[0021] Figure 1 This is a SEM image of the SiC fiber-reinforced copper alloy composite material prepared in Example 1.

[0022] Figure 2 The mechanical tensile property curves are for the SiC fiber-reinforced copper alloy composite material prepared in Example 1.

[0023] Figure 3 Metallographic image of the SiC fiber-reinforced copper alloy composite material prepared in Example 2.

[0024] Figure 4 Metallographic image of the SiC fiber-reinforced copper alloy composite material prepared in Example 3. Detailed Implementation

[0025] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited to these embodiments.

[0026] A method for preparing SiC fiber-reinforced copper alloy composites using vacuum hot pressing technology includes the following steps:

[0027] (1) Prepare cast copper alloy, hot roll the cast copper alloy into sheet copper alloy material, and then cut it into several sheets as needed;

[0028] (2) Stack several sheets of copper alloy material, and lay a layer of SiC fiber between two adjacent sheets of copper alloy material to obtain a multilayer sheet of copper alloy material containing SiC fiber.

[0029] (3) The multilayer sheet copper alloy material containing SiC fibers obtained in step (2) is vacuum hot-pressed to obtain SiC fiber reinforced copper alloy composite material.

[0030] (4) The SiC fiber reinforced copper alloy composite material in step (3) is subjected to annealing heat treatment.

[0031] The cast copper alloy in step (1) comprises, by weight percentage: 57-73 wt% copper, 20-32 wt% zinc, 4-8 wt% aluminum, and 2-4 wt% iron.

[0032] The hot rolling temperature in step (1) is 850-950℃.

[0033] In step (1), the thickness of the hot-rolled sheet copper alloy material is 0.5-1mm, and the number of slices cut is 2-5.

[0034] In step (2), the number of layers in the multilayer sheet copper alloy material is 2-5. In step (2), SiC fibers account for 1-5 wt% of the weight of the multilayer sheet copper alloy material.

[0035] In step (3), the vacuum hot pressing temperature is 850-950℃, the hot pressing pressure is 20-60MPa, the hot pressing time is 1-6h, and the heating rate is 5-10℃ / min.

[0036] In step (4), the annealing heat treatment temperature is 850-950℃ and the annealing heat treatment time is 24-48h.

[0037] A SiC fiber-reinforced copper alloy composite material prepared by the above-mentioned method of preparing SiC fiber-reinforced copper alloy composite material using vacuum hot pressing technology.

[0038] Example 1

[0039] (1) Preparation of as-cast Cu 67 Zn 22 Al8Fe3 copper alloy is produced by hot rolling the cast copper alloy at 900℃ into sheet copper alloy material with a thickness of 0.5mm, and then cutting it into 5 sheets of 40×40mm copper alloy material.

[0040] (2) Stack the above 5 sheet copper alloy materials, and lay a layer of SiC fiber between adjacent sheet copper alloy materials. Lay a total of 4 layers of SiC fiber to obtain a five-layer sheet copper alloy material containing SiC fiber. The SiC fiber accounts for 1 wt% of the weight of the five-layer sheet copper alloy material.

[0041] (3) The five-layer sheet copper alloy material containing SiC fibers in step (2) is subjected to vacuum hot pressing. The hot pressing temperature is 850℃, the pressure is 30MPa, the hot pressing time is 6h, and the heating rate is 10℃ / min to obtain SiC fiber reinforced copper alloy composite material.

[0042] (4) The SiC fiber reinforced copper alloy composite material in step (3) is subjected to annealing heat treatment at a temperature of 900°C for 48 hours.

[0043] Figure 1The image shows a SEM image of the prepared SiC fiber-reinforced copper alloy composite. As can be seen from the image, the SiC fibers maintain a good morphology and are uniformly dispersed in the copper alloy matrix. The interface between the SiC fibers and the copper alloy matrix is ​​well-bonded, with no voids or poor adhesion. Figure 2 The mechanical tensile property curves of the obtained SiC fiber reinforced copper alloy composite are shown in the figure. It can be seen from the figure that the ultimate tensile strength, yield strength and total elongation of the SiC fiber reinforced copper alloy composite are approximately 375 MPa, 590 MPa and 3.2%, respectively.

[0044] Example 2

[0045] (1) Preparation of as-cast Cu 67 Zn 22 Al8Fe3 copper alloy, the cast copper alloy is hot rolled into sheet copper alloy material with a thickness of 0.5mm, and then cut into 4 sheets of 35×40mm copper alloy material;

[0046] (2) Stack the above 4 sheet copper alloy materials, and lay a layer of SiC fiber between adjacent sheet copper alloy materials. Lay a total of 3 layers of SiC fiber to obtain a four-layer sheet copper alloy material containing SiC fiber. The SiC fiber accounts for 5wt% of the weight of the four-layer sheet copper alloy material.

[0047] (3) The four-layer sheet copper alloy material containing SiC fibers in step (2) is subjected to vacuum hot pressing. The hot pressing temperature is 900℃, the pressure is 60MPa, the hot pressing time is 6h, and the heating rate is 10℃ / min to obtain SiC fiber reinforced copper alloy composite material.

[0048] (4) The SiC fiber reinforced copper alloy composite material in step (3) is subjected to annealing heat treatment at a temperature of 900°C for 24 hours.

[0049] Figure 3 The image shows a metallographic image of the prepared SiC fiber reinforced copper alloy composite material. As can be seen from the image, each SiC fiber layer is flat and continuous, and the average spacing between them is about 255 μm.

[0050] Example 3

[0051] (1) Preparation of as-cast Cu 67 Zn 22 Al8Fe3 copper alloy, the cast copper alloy is hot rolled into sheet copper alloy material with a thickness of 0.5mm, and then cut into 4 sheets of 35×40mm copper alloy material;

[0052] (2) Stack the above 4 sheet copper alloy materials, and lay a layer of SiC fiber between adjacent sheet copper alloy materials. Lay a total of 3 layers of SiC fiber to obtain a four-layer sheet copper alloy material containing SiC fiber. The SiC fiber accounts for 4wt% of the weight of the four-layer sheet copper alloy material.

[0053] (3) The four-layer sheet copper alloy containing SiC fibers in step (2) is subjected to vacuum hot pressing at a temperature of 950°C, a pressure of 60MPa, a hot pressing time of 6h, and a heating rate of 10°C / min to obtain a SiC fiber reinforced copper alloy composite material.

[0054] (4) The SiC fiber reinforced copper alloy composite material in step (4) is subjected to annealing heat treatment at a temperature of 900°C for 24 hours.

[0055] Figure 4 The image shows a metallographic image of the prepared SiC fiber reinforced copper alloy composite material. It can be seen from the image that the SiC fibers are well bonded to the matrix, but the SiC fiber layer is no longer continuous.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing SiC fiber-reinforced copper alloy composite materials using vacuum hot pressing technology, characterized in that, Includes the following steps: (1) Prepare cast copper alloy by hot rolling the cast copper alloy into sheet copper alloy material, and then cutting it into several sheets as needed; the cast copper alloy comprises, by weight percentage: copper 57-73 wt%, zinc 20-32 wt%, aluminum 4-8 wt%, iron 2-4 wt%; (2) Stack several sheets of copper alloy material, and lay a layer of SiC fiber between two adjacent sheets of copper alloy material to obtain a multilayer sheet of copper alloy material containing SiC fiber; the SiC fiber accounts for 1-5 wt% of the weight of the multilayer sheet of copper alloy material; the number of layers of the multilayer sheet of copper alloy material is 2-5. (3) The multilayer sheet copper alloy material containing SiC fibers obtained in step (2) is subjected to vacuum hot pressing to obtain SiC fiber reinforced copper alloy composite material; the vacuum hot pressing temperature is 850-950℃, the hot pressing pressure is 20-60 MPa, the hot pressing time is 1-6 h, and the heating rate is 5-10℃ / min. (4) The SiC fiber reinforced copper alloy composite material in step (3) is subjected to annealing heat treatment; the annealing heat treatment temperature is 850-950℃ and the annealing heat treatment time is 24-48 h.

2. The method for preparing SiC fiber-reinforced copper alloy composite material using vacuum hot pressing technology as described in claim 1, wherein the hot rolling temperature in step (1) is 850-950℃.

3. The method for preparing SiC fiber-reinforced copper alloy composite material using vacuum hot pressing technology as described in claim 1, wherein the thickness of the hot-rolled sheet copper alloy material in step (1) is 0.5-1 mm.

4. The method for preparing SiC fiber-reinforced copper alloy composite material using vacuum hot pressing technology as described in claim 1, wherein the number of slices cut in step (1) is 2-5 slices.

5. A SiC fiber-reinforced copper alloy composite material prepared by the method for preparing SiC fiber-reinforced copper alloy composite material using vacuum hot pressing technology as described in any one of claims 1-4.

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