Preparation method of copper-based composite / titanium alloy bimetal

Abstract

This invention discloses a method for preparing a copper-based composite material / titanium alloy bimetallic sample, specifically following these steps: Step 1, processing the WB2 / CuSn10 composite material and TC6 titanium alloy into cylinders, and grinding the contact surfaces to 2000#; Step 2, pickling the treated titanium alloy and WB2 / CuSn10 composite material; subsequently, cleaning and drying the two materials to obtain pretreated WB2 / CuSn10 composite material and TC6 titanium alloy; Step 3, placing the pretreated TC6 titanium alloy and WB2 / CuSn10 composite material obtained in Step 2 sequentially into a hot pressing mold, and placing the hot pressing mold into a vacuum rapid hot pressing sintering furnace for rapid hot pressing connection to obtain a WB2 / CuSn10 composite material and titanium alloy bimetallic sample. This bimetallic sample achieves high strength, high wear resistance, and lightweight while updating the materials and processes of high-pressure plunger pump cylinders.

Description

Technical Field

[0001] This invention belongs to the field of bimetal preparation technology, and relates to a method for preparing copper-based composite material / titanium alloy bimetal. Background Technology

[0002] High-pressure plunger pump cylinder blocks are primarily used under harsh conditions such as high load, high speed, and high wear. The cylinder block material is prone to fatigue failure, cracking, and ultimately fracture and failure. Copper / titanium bimetallic materials combine the high strength of titanium alloys with the friction-reducing and wear-resistant properties of copper alloys, effectively extending the service life of high-pressure plunger pump cylinder blocks.

[0003] The piston pump cylinder body primarily uses lead-tin bronze as the wear-resistant lining material. However, this material generates lead vapor under high-speed operating conditions, causing irreversible harm to human health and the environment. In response to the national green and environmentally friendly development concept, a novel copper-based composite material is needed to replace lead-tin bronze. By adding wear-resistant ceramic phase particles to replace the lead element in the lead-tin bronze alloy, the friction-reducing and wear-resistant properties of the copper-based composite material can be maintained while reducing environmental pollution. However, there is a significant difference in the physicochemical properties between copper-based composite materials and titanium alloys, and the traditional vacuum hot pressing process is inefficient and results in poor bonding strength. Therefore, a new process method is needed to achieve a reliable connection between WB2 / CuSn10 composite materials and titanium alloys. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing copper-based composite material / titanium alloy bimetal. The WB2 / CuSn10 composite material and TC6 titanium alloy bimetal prepared by this method have good wear resistance, achieving high strength, high wear resistance and lightweight while updating the materials and processes of high-pressure plunger pump cylinders.

[0005] The technical solution adopted in this invention is a method for preparing copper-based composite material / titanium alloy bimetal, which specifically includes the following steps: Step 1: Process the WB2 / CuSn10 composite material and TC6 titanium alloy into cylinders, and polish the surface of the cylinders. Step 2: Pickling is performed on the WB2 / CuSn10 composite material and TC6 titanium alloy after Step 1. Then, the WB2 / CuSn10 composite material and TC6 titanium alloy are cleaned and dried respectively to obtain the pretreated WB2 / CuSn10 composite material and TC6 titanium alloy. Step 3: Place the pretreated TC6 titanium alloy and WB2 / CuSn10 composite material obtained in Step 2 into a hot press mold in sequence, and place the hot press mold into a rapid hot press sintering furnace for rapid hot press connection to obtain a bimetallic sample of WB2 / CuSn10 composite material and TC6 titanium alloy.

[0006] The invention is further characterized by: In step 1, the specific grinding process is as follows: the WB2 / CuSn10 composite material and TC6 titanium alloy are ground multiple times on 400~2000# sandpaper to remove surface impurities.

[0007] In step 2, the pickling process is as follows: TC6 titanium alloy and WB2 / CuSn10 composite material are immersed in nitric acid and deionized water solutions with a volume ratio of 1:5 for 50-70 seconds.

[0008] In step 2, use anhydrous ethanol for ultrasonic cleaning for 10-15 minutes.

[0009] In step 3, the rapid hot pressing connection process is as follows: after the vacuum degree of the rapid hot pressing sintering furnace reaches 3.76Pa~5.84Pa, heating begins, and the sintering time is 20~50min. Under the synergistic effect of heat and electricity, the temperature reaches 600~850℃ in 5~15min, and then it is held at that temperature for 15~35min. Only during the holding process is a pressure of 0.7~1T applied. The furnace temperature is rapidly reduced using constant temperature circulating cooling water. After the sample is cooled to below 200℃, it is taken out of the furnace to obtain WB2 / CuSn10 composite material / TC6 titanium alloy bimetal.

[0010] The beneficial effects of this invention are as follows: This invention provides a method for preparing a copper-based composite / titanium alloy bimetallic material. Using a WB2 / CuSn10 composite material, the wear-resistant WB2 particles are dispersed within the copper alloy matrix, improving the overall resistance to plastic deformation. The CuSn alloy matrix primarily resists external deformation. The interaction between the wear-resistant particles and the friction material reduces the average friction coefficient of the WB2 / CuSn10 composite material, extending its service life under high-speed friction environments. Simultaneously, this material replaces traditional lead-tin bronze, eliminating lead vapor volatilization during operation and achieving green environmental protection in both production and application. Copper and titanium have significant differences in physical properties; the conventional diffusion bonding shear strength is only 30.52 MPa. The vacuum rapid hot pressing process, under the synergistic effect of heat, force, and electricity, enhances the diffusion ability of atoms on the contact surface during diffusion bonding, reduces diffusion reaction time, and inhibits the formation of intermetallic compounds and cracks at the interface. The vacuum rapid hot pressing equipment uses constant-temperature circulating cooling water, allowing the sample to cool to a low temperature in a short time, preventing further grain growth and greatly improving the interfacial performance of the bimetallic material. This process reduces the high-temperature diffusion reaction time between dissimilar metals, avoiding the reaction between the ceramic phase and the matrix in the WB2 / CuSn10 composite material, as well as the agglomeration of ceramic phase particles. It ensures excellent friction-reducing and wear-resistant properties of the bimetallic material while also possessing good interfacial bonding strength, with an interfacial shear strength reaching up to 151.53 MPa. Attached Figure Description

[0011] Figures 1(a) and (b) are comparison diagrams of the friction and wear properties of copper-based composite material and lead-tin bronze alloy in this invention; Figure 2 This is a comparison diagram of the sintering process parameters of WB2 / CuSn10 composite material and titanium alloy bimetal in Example 1 and Comparative Example 1 of the preparation method of copper-based composite material / titanium alloy bimetal of the present invention; Figure 3 This is a microstructure diagram of the interface between the WB2 / CuSn10 composite material and the titanium alloy bimetal in Example 3 of the preparation method of the copper-based composite material / titanium alloy bimetal of the present invention. Figure 4 This is a schematic diagram of the shear strength curves of WB2 / CuSn10 composite material and titanium alloy bimetal, prepared by the method of preparing copper-based composite material / titanium alloy bimetal of the present invention. Figure 5 The diagram shows the interfacial microstructure of the WB2 / CuSn10 composite material and the titanium alloy bimetal in Comparative Example 1, which is a preparation method of the copper-based composite material / titanium alloy bimetal of the present invention. Detailed Implementation The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0012] The preparation method of the copper-based composite material / titanium alloy bimetal of the present invention is carried out according to the following steps: Step 1, process the WB2 / CuSn10 composite material and TC6 titanium alloy into... The 20×15mm cylinder undergoes multiple polishing processes on its contact surfaces to remove surface oil and impurities. In step 1, the specific grinding process is as follows: the WB2 / CuSn10 composite material and TC6 titanium alloy are ground multiple times on 400~2000# sandpaper to remove surface impurities.

[0013] Step 2: Pickling is performed on the treated TC6 titanium alloy and WB2 / CuSn10 composite material; then the two materials are cleaned and dried to obtain the pretreated WB2 / CuSn10 composite material and TC6 titanium alloy. In step 2, the pickling process is as follows: the titanium alloy and WB2 / CuSn10 composite material are immersed in a solution of nitric acid (60%): deionized water = 1:5 (volume ratio) for 50-70 seconds; the cleaning is performed by ultrasonic cleaning with anhydrous ethanol for 10-15 minutes.

[0014] Step 3: Place the pretreated TC6 titanium alloy and WB2 / CuSn10 composite material obtained in Step 2 into a hot press mold in sequence, and place the hot press mold into a rapid hot press sintering furnace for rapid hot press connection to obtain a bimetallic sample of WB2 / CuSn10 composite material and TC6 titanium alloy.

[0015] In step 3, the rapid hot pressing connection process is as follows: after the vacuum degree of the rapid hot pressing sintering furnace reaches 3.76Pa~5.84Pa, heating begins, and the sintering time is 20~50min. Under the synergistic effect of heat and electricity, the temperature reaches 600~850℃ in 5~15min, and then it is held at that temperature for 15~35min. Only during the holding process is a pressure of 0.7~1T applied, and the furnace temperature is rapidly reduced by constant temperature circulating cooling water, which shortens the sample preparation time to 1 / 5 of the traditional vacuum hot pressing process. After the sample cools down to below 200℃, it is taken out of the furnace to obtain WB2 / CuSn10 composite material / TC6 titanium alloy bimetal.

[0016] Example 1 The friction and wear performance of the WB2 / CuSn10 composite material and lead-tin bronze used in this invention are compared in Figures 1(a) and (b). The friction coefficient of the WB2 / CuSn10 composite material is superior to that of lead-tin bronze. Figure 1(a) shows the wear performance of the WB2 / CuSn10 composite material; Figure 1(b) shows the wear performance of lead-tin bronze.

[0017] The WB2 / CuSn10 composite material (hereinafter referred to as WB2 / CuSn10) and TC6 titanium alloy (hereinafter referred to as TC6) were vacuum stored for later use after surface polishing and pickling. The pretreated TC6 and WB2 / CuSn10 were sequentially assembled and placed into a hot-pressing mold, which was then placed into a vacuum rapid hot-pressing sintering furnace. Heating began once the vacuum level inside the furnace reached 5.32 Pa. The sintering process parameters were as follows: Figure 2 As shown in (b), under the synergistic effect of heat and electricity, the temperature was raised to 600℃ in 7 minutes and held for 30 minutes while a pressure of 0.9T was applied. After the heating and holding process, the furnace temperature was rapidly reduced by constant-temperature circulating cooling water, and the sample was cooled to below 200℃ in 50 minutes. This shortened the sample preparation time to 1 / 5 of the traditional vacuum hot pressing process, resulting in a bimetallic sample of WB2 / CuSn10 composite material and TC6 titanium alloy. Microstructural observation of the sample showed good interfacial bonding without defects such as pores or cracks. Mechanical property testing revealed that... Figure 4 As shown, its interfacial shear strength can reach 85.47 MPa.

[0018] Example 2 After surface grinding and pickling, WB2 / CuSn10 composite material and TC6 titanium alloy were vacuum stored for later use. Pretreated TC6 and WB2 / CuSn10 were sequentially assembled and placed in a hot-pressing mold within a vacuum rapid hot-pressing sintering furnace. Heating began once the vacuum level in the furnace reached 4.57 Pa. Under the combined action of heat and electricity, the temperature reached 800℃ in 8 minutes and was held for 30 minutes while applying a pressure of 0.9T. After the heating and holding processes, a constant-temperature circulating cooling water system rapidly reduced the furnace temperature, cooling the sample to below 200℃ in 50 minutes. This reduced the sample preparation time to 1 / 5 of the traditional vacuum hot-pressing process, yielding a bimetallic sample of WB2 / CuSn10 composite material and TC6 titanium alloy. Metallographic observation revealed good interfacial bonding without defects such as pores or cracks. Mechanical property testing showed that… Figure 4 As shown, its interfacial shear strength can reach 151.53 MPa.

[0019] Example 3 After surface grinding and pickling, WB2 / CuSn10 composite material and TC6 titanium alloy were vacuum stored for later use. Pretreated TC6 and WB2 / CuSn10 were sequentially assembled and placed in a hot-pressing mold within a vacuum rapid hot-pressing sintering furnace. Heating began once the vacuum level reached 5.84 Pa. Under the combined action of heat and electricity, the temperature reached 850℃ in 9 minutes, followed by a 30-minute holding period while applying a pressure of 0.9T. After the heating and holding processes, a constant-temperature circulating cooling water system rapidly lowered the furnace temperature, cooling the sample to below 200℃ within 50 minutes. This reduced the sample preparation time to 1 / 5 of the traditional vacuum hot-pressing process, yielding a bimetallic sample of WB2 / CuSn10 composite material and TC6 titanium alloy. Metallographic observation revealed good interfacial bonding without defects such as pores or cracks. Figure 3 As shown. Mechanical property testing revealed, as... Figure 4 As shown, its interfacial shear strength can reach 88.04 MPa.

[0020] Comparative Example 1 After surface grinding and pickling, WB2 / CuSn10 composite material and TC6 titanium alloy were vacuum stored for later use. The pretreated TC6 and WB2 / CuSn10 are sequentially arranged and placed in a hot-pressing mold, then placed in a hot-pressing sintering furnace. When the vacuum degree inside the vacuum hot-pressing sintering furnace reaches 6.80 × 10⁻⁶... -3 Heating begins after Pa, and the sintering process parameters are as follows: Figure 2As shown in (a), after 40 minutes of furnace heating to 750℃, the temperature was held for 30 minutes while a pressure of 0.9T was applied. After heating and holding, the sample was cooled with the furnace to obtain a bimetallic specimen of WB2 / CuSn10 composite material and TC6 titanium alloy. Microstructural observation of the specimens revealed good interfacial bonding without defects such as pores or cracks. However, in the WB2 / CuSn10 composite material, the ceramic phase particles reacted with the matrix, and the wear-resistant phase agglomerated, as shown in (a). Figure 5 As shown, this results in a decrease in the material's friction-reducing and wear-resistant effects.

Claims

1. A method for preparing copper-based composite material / titanium alloy bimetal, characterized in that, Specifically, the steps include the following: Step 1: The WB2 / CuSn10 composite material and TC6 titanium alloy are respectively processed into cylinders, and the surface of the cylinders is polished. The specific polishing process in Step 1 is as follows: The WB2 / CuSn10 composite material and TC6 titanium alloy are polished multiple times on 400~2000# sandpaper to remove surface impurities. Step 2 involves pickling the WB2 / CuSn10 composite material and TC6 titanium alloy treated in Step 1, followed by cleaning and drying to obtain pretreated WB2 / CuSn10 composite material and TC6 titanium alloy. The pickling process in Step 2 involves immersing the TC6 titanium alloy and WB2 / CuSn10 composite material in a 1:5 volume ratio of nitric acid and deionized water for 50-70 seconds. The cleaning process in Step 2 involves ultrasonic cleaning with anhydrous ethanol for 10-15 minutes. Step 3: Place the pretreated TC6 titanium alloy and WB2 / CuSn10 composite material obtained in Step 2 into a hot press mold in sequence, and place the hot press mold into a rapid hot press sintering furnace for rapid hot press connection to obtain a bimetallic sample of WB2 / CuSn10 composite material and TC6 titanium alloy. In step 3, the rapid hot pressing connection process is as follows: after the vacuum degree of the rapid hot pressing sintering furnace reaches 3.76Pa~5.84Pa, heating begins, and the sintering time is 20~50min. Under the synergistic effect of heat and electricity, the temperature reaches 600~850℃ in 5~15min, and then it is held at the temperature for 15~35min. Only during the holding process is a pressure of 0.7~1T applied, and the furnace temperature is rapidly reduced using constant temperature circulating cooling water. After the sample is cooled to below 200℃, it is taken out of the furnace to obtain WB2 / CuSn10 composite material / TC6 titanium alloy bimetal.

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