High-heat-resistant tellurium-copper alloy strip and preparation process thereof

Abstract

The application discloses a high-heat-resistance tellurium-copper alloy strip and a preparation process thereof, and relates to the technical field of tellurium-copper alloys. Step 1: electrolytic copper, pure tellurium, pure selenium and copper-cerium intermediate alloy are mixed, smelted and semi-continuously cast to obtain a base casting; step 2: the base casting is sequentially subjected to homogenization annealing, hot rolling, solid solution annealing, aging treatment, two-rolling and stress relief annealing to obtain the high-heat-resistance tellurium-copper alloy strip. The high-heat-resistance tellurium-copper alloy strip comprises the following components: 0.1wt%-0.5wt% of tellurium, 0.01wt%-0.03wt% of cerium, 0.05wt%-0.15wt% of selenium, impurity content <0.3wt% and the rest of copper. In the application, the mechanical properties and high-temperature stability are synergistically improved by regulating and controlling selenium and cerium; and the high-temperature resistance is further improved on the basis of ensuring the electric conductivity through a surface laser cladding enhancement layer, thereby providing reliable guarantee for the application of the alloy strip in a high-temperature complex environment.

Description

Technical Field

[0001] This invention relates to the field of tellurium copper alloy technology, specifically a high heat-resistant tellurium copper alloy strip and its preparation process. Background Technology

[0002] In modern industry, the performance requirements of metal materials in electronic devices or high-end equipment are gradually increasing. Among them, tellurium copper alloy, as a metal material with good electrical conductivity and good processability, occupies an important position in many industries and is widely used in electronics, electrical, and machinery manufacturing.

[0003] In existing technologies, the heat resistance and mechanical properties of tellurium copper alloys still have certain limitations. Traditional tellurium copper alloys are mainly composed of basic metallic elements such as copper and tellurium. Under high-temperature environments, the thermal motion of atoms inside intensifies, and the stability of the atomic arrangement in the crystal structure is disrupted. On the one hand, the dislocation movement inside the alloy becomes more frequent and disordered, leading to a significant reduction in the alloy's strength and hardness; on the other hand, the atomic diffusion effect induced by high temperatures promotes element segregation at grain boundaries, weakening the grain boundary bonding force and further reducing the overall mechanical properties of the alloy. For example, in the heat dissipation modules of high-power electronic devices, when the chip is in a high-temperature operating state for a long time, the heat sinks made of traditional tellurium copper alloys are insufficient in heat resistance and cannot continuously and efficiently conduct heat away. This not only leads to excessively high operating temperatures and degrades the performance of electronic components, but also affects the internal structural stability due to thermal deformation of the material. In the field of electrical connections under high-temperature environments, the contact resistance of traditional tellurium copper alloy connecting parts increases significantly after long-term heating, leading to reduced power transmission efficiency and even causing local overheating, posing serious safety hazards.

[0004] In summary, solving the above problems and preparing a high heat-resistant tellurium-copper alloy strip is of great significance. Summary of the Invention

[0005] The purpose of this invention is to provide a high heat-resistant tellurium copper alloy strip and its preparation process to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A process for preparing a high heat-resistant tellurium copper alloy strip includes the following steps:

[0008] Step 1: Mix and smelt electrolytic copper, pure tellurium, pure selenium, and copper-cerium master alloy, and then semi-continuously cast to obtain the basic casting;

[0009] Step 2: The basic casting is subjected to homogenization annealing, hot rolling, solution annealing, aging treatment, second rolling, and stress relief annealing in sequence to obtain high heat-resistant tellurium copper alloy strip.

[0010] In a more optimized form, the high heat-resistant tellurium-copper alloy strip comprises the following components: 0.1wt% to 0.5wt% tellurium, 0.01wt% to 0.03wt% cerium, 0.05wt% to 0.15wt% selenium, impurity content <0.3wt%, and the remainder being copper.

[0011] In a more optimized manner, during the mixed smelting process, a copper-phosphorus alloy and calcium hexaboride with a mass ratio of 0.2:9.8 are used as deoxidizers, charcoal and graphite phosphorus with a mass ratio of 1:4 are used as covering agents, and the smelting temperature is 1150–1250℃; during the semi-continuous casting process, the pouring temperature is 1100–1200℃, the casting speed is 40–60 mm / min, and the crystallizer temperature is 200–300℃.

[0012] In a more optimized manner, the homogenization annealing process is carried out at a temperature of 900–950℃ for 3–8 hours; the hot rolling process is carried out at a temperature of 950–980℃, a rolling speed of 200–300 m / min, water quenching, and a total processing rate of 90–95%; the solution annealing process is carried out at a temperature of 1000–1100℃ and a speed of 100–150 m / min; the aging treatment process is carried out at an aging temperature of 300–500℃ and an aging time of 3–4 hours; the second rolling is cold rolling with a total processing rate of 60–65%; and the stress-relief annealing process is carried out at a temperature of 250–400℃ and a speed of 50–100 m / min.

[0013] In a more optimized manner, the basic casting is pre-clad with a reinforcing layer. The specific process of step 2 is as follows: (1) preheat the basic casting to 500-650℃; spray boron carbide composite powder; laser cladding to form a reinforcing layer; and obtain a plated casting; (2) perform homogenization annealing, hot rolling, solution annealing, aging treatment, second rolling, and stress relief annealing on the plated casting in sequence to obtain a high heat-resistant tellurium copper alloy strip.

[0014] In a more optimized manner, the spraying is plasma spraying, with a powder feeding rate of 10-15 g / min and a nozzle distance of 10-20 mm; during the laser cladding process, the auxiliary static magnetic field is 0.2-0.5 T, the laser power is 1500-1800 W, the scanning speed is 4-6 mm / s, and the spot diameter is 3-5 mm.

[0015] In a more optimized manner, the preparation method of the boron carbide composite powder is as follows: (1) boron carbide is placed in an alkaline solution, a roughening solution, a sensitizing solution and an activation solution for treatment in sequence; then it is transferred to a nickel plating solution, stirred at 80-85°C for 1-2 hours, washed, and vacuum dried at 120-150°C to obtain modified boron carbide; (2) electrolytic copper powder, modified boron carbide, silicon powder and zirconium powder are ground and mixed to obtain boron carbide composite powder.

[0016] In a more optimized manner, the nickel plating solution comprises the following components: 12-15g nickel sulfate, 3-5g silver nitrate, 14-16g sodium hypophosphite, 12-15g sodium acetate, 6-8g lactic acid, 3-5g ammonia, and 500-520g deionized water.

[0017] In a more optimized manner, the boron carbide composite powder comprises the following components by weight: 100 parts electrolytic copper powder, 1.5 to 2.5 parts modified boron carbide, 0.5 to 1 part silicon powder, and 1 to 2 parts zirconium powder.

[0018] A process for preparing a high heat-resistant tellurium copper alloy strip.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: by regulating selenium and cerium, the mechanical properties and high-temperature stability are synergistically improved; on the other hand, by using a surface laser cladding reinforcement layer, the high-temperature resistance is further improved while ensuring conductivity, providing a reliable guarantee for the application of alloy strips in high-temperature and complex environments.

[0020] Selenium in copper can generate Cu₂Se dispersed particles, promoting dislocation movement and grain growth, thus refining and densifying the internal structure of the alloy, effectively strengthening the tellurium copper alloy and enhancing its mechanical properties. The introduction of this element can effectively hinder atomic diffusion and dislocation movement at high temperatures, thereby suppressing deformation at high temperatures. Cerium, a rare earth element, can promote nucleation, facilitating grain refinement, purifying copper grain boundaries, reducing the segregation of impurities and other harmful elements at grain boundaries, and promoting the mechanical properties of tellurium copper alloys. It also improves oxidation resistance, forming a dense oxide film at high temperatures, further oxidizing the internal structure. The combined introduction of both elements requires careful control due to their solid solution properties; improper proportions may lead to an increase in brittle phases, conversely reducing the material's mechanical properties and thermal shock resistance.

[0021] The process involves forming a reinforcing layer on the surface of the copper tellurium alloy strip using laser cladding technology. This enhances the strength of the tellurium alloy strip while simultaneously improving its thermal conductivity, thereby increasing its heat resistance and service life. The preheating of the base casting, essentially a thermal activation process, effectively buffers internal stress during spraying and promotes physicochemical interactions between the surface and the sprayed powder, improving powder deposition efficiency and bonding strength. Temperature control is crucial; excessively low temperatures can lead to temperature differences, causing cracks and affecting overall strength. A static magnetic field is incorporated into the laser cladding process, resulting in a more uniform distribution of the surface reinforcing layer, reducing segregation and improving coating uniformity. Furthermore, the laser's mutual dissolution under the magnetic field promotes the growth of a finer surface structure, reducing porosity and defects, thus effectively improving surface strength, heat resistance, and electrical conductivity. The laser cladding uses boron carbide composite powder, obtained by electrolyzing a mixture of modified boron carbide, silicon powder, and zirconium powder in specific proportions. The modified boron carbide surface is loaded with nickel and silver, which helps improve its contact with the metal interface and enhances the bonding strength of the reinforcing layer. Furthermore, the introduction of modified boron carbide can significantly improve the strength of the composite layer, effectively enhance thermal conductivity, and improve high-temperature resistance. In addition, under high-power laser cladding, boron carbide can form ZrB2-SiC with zirconium and silicon; since ZrB2 has better electrical conductivity and heat resistance, it effectively promotes the improvement of the overall performance of tellurium copper alloy strip by the surface layer. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that the following proportions are by weight. There are no special restrictions on the purchasers of any of the raw materials involved in this invention. Exemplary examples include: in the following embodiments, the electrolytic copper has a purity of 99.99%, the pure tellurium has a purity of 99.99%, the copper-cerium master alloy is copper-10% cerium, and the pure selenium is Se powder with a purity of 99.9% and a particle size of 200 mesh, purchased from Aladdin; all the above and other raw materials are commercially available.

[0024] In Examples 1-3, the deoxidizer consisted of a copper-14.3% phosphorus alloy and calcium hexaboride in a mass ratio of 0.2:9.8; the covering agent consisted of charcoal and graphite phosphorus in a mass ratio of 1:4. The high heat-resistant tellurium-copper alloy strip contained the following components: 0.31 wt% tellurium, 0.018 wt% cerium, 0.11 wt% selenium, 0.008 wt% boron, 0.002 wt% phosphorus, 0.013 wt% oxygen, with the remainder being copper.

[0025] Example 1: A preparation process for a high heat-resistant tellurium copper alloy strip, comprising the following steps:

[0026] Pre-preparation: The preparation method of modified boron carbide is as follows: (1) Place boron carbide in a 1 mol / L sodium hydroxide aqueous solution and stir for 10 minutes, filter, wash and dry; transfer to a roughening solution containing 1 g / mL hydrogen peroxide and 1 g / mL nitric acid and stir for 5 minutes, filter, wash and dry; transfer to a sensitizing solution containing 0.025 g / mL stannous chloride and 0.1 g / mL hydrochloric acid and stir for 5 minutes, filter, wash and dry; transfer to an activation solution containing 0.03 g / mL nickel chloride, 0.03 g / mL sodium hypophosphite and 0.6 g / mL ethanol and stir for 10 minutes, filter, wash and dry; then transfer to a nickel plating solution, stir at 80°C for 2 hours, wash, and vacuum dry at 150°C to obtain modified boron carbide; wherein, the nickel plating solution includes the following components: 15 g nickel sulfate, 5 g silver nitrate, 15 g sodium hypophosphite, 12 g sodium acetate, 6 g lactic acid, 4.5 g ammonia water and 500 g deionized water;

[0027] Step 1: Preheat the electric furnace to 600℃, add electrolytic copper, deoxidizer, and covering agent; then add pure tellurium, pure selenium, and copper-cerium master alloy in sequence, mix and melt at 1200℃, and then carry out semi-continuous casting. During the process, the casting temperature is 1180℃, the casting speed is 60mm / min, and the crystallizer temperature is 280℃; the basic casting is obtained; wherein, the deoxidizer accounts for 0.5wt% of the total metal content; and the covering agent accounts for 0.3wt% of the total metal content.

[0028] Step 2: (1) Preheat the base casting to 600℃; spray boron carbide composite powder, during which the powder feeding rate is 15g / min and the nozzle distance is 15mm; laser cladding, during which the auxiliary static magnetic field is 0.5T, the laser power is 1800W, the scanning speed is 6mm / s, and the spot diameter is 3mm to form a reinforcing layer; obtain the plated casting; (2) perform homogenization annealing on the plated casting in sequence, during which the temperature is 950℃ and the time is 5 hours; hot rolling The process involves: hot rolling at 980℃, rolling speed at 200m / min, water quenching, and a total processing rate of 95%; solution annealing at 1000℃ and a speed of 150m / min; aging treatment at 450℃ and for 3 hours; second rolling, cold rolling, with a total processing rate of 65%; and stress-relief annealing at 380℃ and a speed of 60m / min, resulting in a high-heat-resistant tellurium copper alloy strip.

[0029] The boron carbide composite powder comprises the following components by weight: 100 parts electrolytic copper powder, 2 parts modified boron carbide, 0.8 parts silicon powder, and 1.6 parts zirconium powder.

[0030] Example 2: A preparation process for a high heat-resistant tellurium copper alloy strip, comprising the following steps:

[0031] Pre-preparation: The preparation method of modified boron carbide is as follows: (1) Place boron carbide in a 1 mol / L sodium hydroxide aqueous solution and stir for 10 minutes, filter, wash and dry; transfer to a roughening solution containing 1 g / mL hydrogen peroxide and 1 g / mL nitric acid and stir for 5 minutes, filter, wash and dry; transfer to a sensitizing solution containing 0.025 g / mL stannous chloride and 0.1 g / mL hydrochloric acid and stir for 5 minutes, filter, wash and dry; transfer to an activation solution containing 0.03 g / mL nickel chloride, 0.03 g / mL sodium hypophosphite and 0.6 g / mL ethanol and stir for 10 minutes, filter, wash and dry; then transfer to a nickel plating solution, stir at 80°C for 2 hours, wash, and vacuum dry at 150°C to obtain modified boron carbide; wherein, the nickel plating solution includes the following components: 15 g nickel sulfate, 5 g silver nitrate, 15 g sodium hypophosphite, 12 g sodium acetate, 6 g lactic acid, 4.5 g ammonia water and 500 g deionized water;

[0032] Step 1: Preheat the electric furnace to 600℃, add electrolytic copper, deoxidizer, and covering agent; then add pure tellurium, pure selenium, and copper-cerium master alloy in sequence, mix and melt at 1200℃, and then carry out semi-continuous casting. During the process, the casting temperature is 1180℃, the casting speed is 60mm / min, and the crystallizer temperature is 280℃; the basic casting is obtained; wherein, the deoxidizer accounts for 0.5wt% of the total metal content; and the covering agent accounts for 0.3wt% of the total metal content.

[0033] Step 2: (1) Preheat the base casting to 500℃; spray boron carbide composite powder, during which the powder feeding rate is 15g / min and the nozzle distance is 15mm; laser cladding, during which the auxiliary static magnetic field is 0.2T, the laser power is 1800W, the scanning speed is 6mm / s, and the spot diameter is 3mm to form a reinforcing layer; obtain the plated casting; (2) perform homogenization annealing on the plated casting in sequence, during which the temperature is 900℃ and the time is 8 hours; hot rolling The process involves: hot rolling at 950℃ and a rolling speed of 200m / min, followed by water quenching and a total processing rate of 95%; solution annealing at 1100℃ and a speed of 100m / min; aging treatment at 500℃ and for 3 hours; second rolling, which is cold rolling with a total processing rate of 65%; and stress-relief annealing at 250℃ and a speed of 50m / min, resulting in a high-heat-resistant tellurium copper alloy strip.

[0034] The boron carbide composite powder comprises the following components by weight: 100 parts electrolytic copper powder, 1.5 parts modified boron carbide, 0.5 parts silicon powder, and 1 part zirconium powder.

[0035] Example 3: A preparation process for a high heat-resistant tellurium copper alloy strip, comprising the following steps:

[0036] Pre-preparation: The preparation method of modified boron carbide is as follows: (1) Place boron carbide in a 1 mol / L sodium hydroxide aqueous solution and stir for 10 minutes, filter, wash and dry; transfer to a roughening solution containing 1 g / mL hydrogen peroxide and 1 g / mL nitric acid and stir for 5 minutes, filter, wash and dry; transfer to a sensitizing solution containing 0.025 g / mL stannous chloride and 0.1 g / mL hydrochloric acid and stir for 5 minutes, filter, wash and dry; transfer to an activation solution containing 0.03 g / mL nickel chloride, 0.03 g / mL sodium hypophosphite and 0.6 g / mL ethanol and stir for 10 minutes, filter, wash and dry; then transfer to a nickel plating solution, stir at 80°C for 2 hours, wash, and vacuum dry at 150°C to obtain modified boron carbide; wherein, the nickel plating solution includes the following components: 15 g nickel sulfate, 5 g silver nitrate, 15 g sodium hypophosphite, 12 g sodium acetate, 6 g lactic acid, 4.5 g ammonia water and 500 g deionized water;

[0037] Step 1: Preheat the electric furnace to 600℃, add electrolytic copper, deoxidizer, and covering agent; then add pure tellurium, pure selenium, and copper-cerium master alloy in sequence, mix and melt at 1200℃, and then carry out semi-continuous casting. During the process, the casting temperature is 1180℃, the casting speed is 60mm / min, and the crystallizer temperature is 280℃; the basic casting is obtained; wherein, the deoxidizer accounts for 0.5wt% of the total metal content; and the covering agent accounts for 0.3wt% of the total metal content.

[0038] Step 2: (1) Preheat the base casting to 650℃; spray boron carbide composite powder, during which the powder feeding rate is 15g / min and the nozzle distance is 15mm; laser cladding, during which the auxiliary static magnetic field is 0.5T, the laser power is 1800W, the scanning speed is 6mm / s, and the spot diameter is 3mm to form a reinforcing layer; obtain the plated casting; (2) perform homogenization annealing on the plated casting in sequence, during which the temperature is 950℃ and the time is 3 hours; hot rolling, The process involves: hot rolling at 980℃ and a rolling speed of 300m / min, followed by water quenching and a total processing rate of 95%; solution annealing at 1000℃ and a speed of 150m / min; aging treatment at 300℃ and for 4 hours; second rolling, which is cold rolling with a total processing rate of 65%; and stress-relief annealing at 400℃ and a speed of 100m / min, resulting in a high-heat-resistant tellurium copper alloy strip.

[0039] The boron carbide composite powder comprises the following components by mass: 100 parts electrolytic copper powder, 2.5 parts modified boron carbide, 1 part silicon powder, and 2 parts zirconium powder.

[0040] Comparative Example 1: The composition and process of the base casting are the same as in Example 1. Subsequent operations are performed directly on the base casting. The specific differences are as follows:

[0041] Step 2: The basic casting is subjected to homogenization annealing in sequence, with the following processes: temperature 950℃, time 5 hours; hot rolling, with the following processes: hot rolling temperature 980℃, rolling speed 200m / min, water quenching, and total machining rate of 95%; solution annealing, with the following processes: temperature 1000℃, speed 150m / min; aging treatment, with the following processes: aging temperature 450℃, aging time 3 hours; second rolling, with the following processes: cold rolling, and total machining rate of 65%; stress-relief annealing, with the following processes: temperature 380℃, speed 60m / min, to obtain high heat-resistant tellurium copper alloy strip;

[0042] The boron carbide composite powder comprises the following components by weight: 100 parts electrolytic copper powder, 2 parts modified boron carbide, 0.8 parts silicon powder, and 1.6 parts zirconium powder.

[0043] Comparative Example 2: The process of the basic casting and the process of step 2 are the same as those of Example 1, except that the metal composition is different. The specific differences are as follows: The high heat-resistant tellurium copper alloy strip includes the following components: 0.33wt% tellurium, 0.14wt% cerium, 0.011wt% boron, 0.006wt% phosphorus, 0.018wt% oxygen, and the remainder is copper.

[0044] Comparative Example 3: The composition and process of the base casting are the same as in Example 1, but the preheating temperature before spraying is reduced, and no aging treatment is performed; the specific differences are as follows:

[0045] Step 2: (1) Preheat the base casting to 300℃; spray boron carbide composite powder, during which the powder feeding rate is 15g / min and the nozzle distance is 15mm; laser cladding, during which the auxiliary static magnetic field is 0.5T, the laser power is 1800W, the scanning speed is 6mm / s and the spot diameter is 3mm to form an enhancement layer; and obtain the plated casting; (2) perform homogenization annealing on the plated casting in sequence, during which the temperature is 950℃ and the time is 5 hours; hot rolling, during which the hot rolling temperature is 980℃, the rolling speed is 200m / min, water quenching, and the total processing rate is 95%; solution annealing, during which the temperature is 1000℃ and the speed is 150m / min; second rolling, during which the process is cold rolling and the total processing rate is 65%; stress relief annealing, during which the temperature is 380℃ and the speed is 60m / min, to obtain high heat-resistant tellurium copper alloy strip;

[0046] The boron carbide composite powder comprises the following components by weight: 100 parts electrolytic copper powder, 2 parts modified boron carbide, 0.8 parts silicon powder, and 1.6 parts zirconium powder.

[0047] Comparative Example 4: The composition and process of the base casting are the same as in Example 1, but no static magnetic field is set during the laser coating process; the specific differences are as follows:

[0048] Step 2: (1) Preheat the base casting to 600℃; spray boron carbide composite powder, during which: the powder feeding rate is 15g / min and the nozzle distance is 15mm; laser cladding, during which: the laser power is 1800W, the scanning speed is 6mm / s, and the spot diameter is 3mm, to form a reinforcing layer; obtain the plated casting; (2) perform homogenization annealing on the plated casting in sequence, during which: the temperature is 950℃ and the time is 5 hours; hot rolling, during which: The hot rolling process was carried out at a temperature of 980℃ and a rolling speed of 200m / min, followed by water quenching and a total machining rate of 95%. Solution annealing was performed at a temperature of 1000℃ and a speed of 150m / min. Aging treatment was then carried out at a temperature of 450℃ and an aging time of 3 hours. A second rolling process was performed using cold rolling, with a total machining rate of 65%. Stress-relief annealing was then performed at a temperature of 380℃ and a speed of 60m / min, resulting in a high-heat-resistant tellurium copper alloy strip.

[0049] The boron carbide composite powder comprises the following components by weight: 100 parts electrolytic copper powder, 2 parts modified boron carbide, 0.8 parts silicon powder, and 1.6 parts zirconium powder.

[0050] Comparative Example 5: The composition and process of the basic casting are the same as those of Example 1, but the boron carbide composite powder is changed. The specific differences are as follows: The boron carbide composite powder includes the following mass components: 100 parts of electrolytic copper powder and 2 parts of modified boron carbide.

[0051] Performance Test 1: The high heat-resistant tellurium copper alloy strips obtained in Examples 1-3 and Comparative Examples 1-5 were made into samples, and relevant performance tests were performed on them. A universal tensile testing machine was used at a speed of 1 mm / min to test their tensile strength at 20℃ and 400℃. A conductivity meter was used to test their electrical conductivity at 20℃. The obtained data are shown in the table below:

[0052]

[0053]

[0054] Conclusion: The data in the table above show that this application effectively improves the heat resistance of tellurium copper alloy strip through composition adjustment and surface laser cladding reinforcement layer; it also improves the tensile strength at high temperatures. Data from Comparative Examples 1-5 show that: in Comparative Example 1, the lack of a laser cladding reinforcement layer leads to a decrease in relevant properties; in Comparative Example 2, the absence of selenium leads to a decrease in mechanical and heat resistance properties; in Comparative Example 3, the reduced preheating temperature decreases interfacial interaction, resulting in a decrease in relevant properties. In Comparative Example 4, the absence of a static magnetic field reduces orderliness, leading to a decrease in electrical conductivity; in Comparative Example 5, the absence of zirconium and silicon alters the morphology, resulting in a decrease in relevant properties.

[0055] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A preparation process for a high heat-resistant tellurium copper alloy strip, characterized in that: Includes the following steps: Step 1: Mix and smelt electrolytic copper, pure tellurium, pure selenium, and copper-cerium master alloy, and then semi-continuously cast to obtain the basic casting; Step 2: (1) Preheat the base casting to 500-650℃; spray boron carbide composite powder; laser cladding to form a reinforcing layer; obtain the plated casting; (2) perform homogenization annealing, hot rolling, solution annealing, aging treatment, second rolling, and stress relief annealing on the plated casting in sequence to obtain high heat-resistant tellurium copper alloy strip. The high heat-resistant tellurium copper alloy strip comprises the following components: 0.1wt% to 0.5wt% tellurium, 0.01wt% to 0.03wt% cerium, 0.05wt% to 0.15wt% selenium, impurity content <0.3wt%, and the remainder being copper; During the laser cladding process, the auxiliary static magnetic field is 0.2-0.5T, the laser power is 1500-1800W, the scanning speed is 4-6mm / s, and the spot diameter is 3-5mm. The preparation method of the boron carbide composite powder is as follows: (1) Boron carbide is placed in alkaline solution, roughening solution, sensitizing solution and activation solution in sequence for treatment; then it is transferred to nickel plating solution, stirred at 80-85℃ for 1-2 hours, washed, and vacuum dried at 120-150℃ to obtain modified boron carbide. (2) Electrolytic copper powder, modified boron carbide, silicon powder and zirconium powder are ground and mixed to obtain boron carbide composite powder.

2. The preparation process of a high heat-resistant tellurium copper alloy strip according to claim 1, characterized in that: In the mixed smelting process, a copper-phosphorus alloy and calcium hexaboride with a mass ratio of 0.2:9.8 are used as deoxidizers, and charcoal and graphite phosphorus with a mass ratio of 1:4 are used as covering agents. The smelting temperature is 1150-1250℃. In the semi-continuous casting process, the pouring temperature is 1100-1200℃, the casting speed is 40-60mm / min, and the crystallizer temperature is 200-300℃.

3. The preparation process of a high heat-resistant tellurium copper alloy strip according to claim 1, characterized in that: During the homogenization annealing process, the temperature is 900–950℃ and the time is 3–8 hours; during the hot rolling process, the hot rolling temperature is 950–980℃, the rolling speed is 200–300 m / min, water quenching is performed, and the total processing rate is 90–95%; during the solution annealing process, the temperature is 1000–1100℃ and the speed is 100–150 m / min; during the aging treatment process, the aging temperature is 300–500℃ and the aging time is 3–4 hours; the second rolling is cold rolling, and the total processing rate is 60–65%; during the stress-relief annealing process, the temperature is 250–400℃ and the speed is 50–100 m / min.

4. The preparation process of a high heat-resistant tellurium copper alloy strip according to claim 1, characterized in that: The spraying is plasma spraying, with a powder feeding rate of 10-15 g / min and a nozzle distance of 10-20 mm.

5. The preparation process of a high heat-resistant tellurium copper alloy strip according to claim 1, characterized in that: The nickel plating solution comprises the following components: 12-15g nickel sulfate, 3-5g silver nitrate, 14-16g sodium hypophosphite, 12-15g sodium acetate, 6-8g lactic acid, 3-5g ammonia, and 500-520g deionized water.

6. The preparation process of a high heat-resistant tellurium copper alloy strip according to claim 1, characterized in that: The boron carbide composite powder comprises the following components by weight: 100 parts electrolytic copper powder, 1.5 to 2.5 parts modified boron carbide, 0.5 to 1 part silicon powder, and 1 to 2 parts zirconium powder.

7. The high heat-resistant tellurium copper alloy strip prepared by the preparation process of the high heat-resistant tellurium copper alloy strip according to any one of claims 1 to 6.

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