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

Abstract

The invention discloses a high-heat-resistance tellurium-copper alloy strip and a preparation process thereof, and relates to the technical field of tellurium-copper alloys. The method comprises the steps that 1, electrolytic copper, pure tellurium, pure selenium and a copper-cerium intermediate alloy are mixed, smelted and subjected to semi-continuous casting; obtaining a basic casting; and 2, the basic casting is sequentially subjected to homogenizing annealing, hot rolling, solution annealing, aging treatment, secondary rolling and stress relief annealing, and the high-heat-resistance tellurium-copper alloy strip is obtained. The high-heat-resistance tellurium-copper alloy strip comprises the following components: 0.1 wt%-0.5 wt% of tellurium, 0.01 wt%-0.03 wt% of cerium, 0.05 wt%-0.15 wt% of selenium, less than 0.3 wt% of impurities and the balance of copper. Through regulation and control of selenium and cerium, mechanical properties and high-temperature stability are synergistically improved; and through surface laser cladding of the enhancement layer, on the basis of ensuring the conductivity, the high temperature resistance is further improved, and reliable guarantee is provided for application of the alloy strip in a high-temperature complex environment.

Description

Technical Field

[0001] The invention relates to the technical field of tellurium-copper alloys, in particular to a high-heat-resistant tellurium-copper alloy strip and a preparation process thereof. Background Art

[0002] In the modern industrial field, the performance requirements for metal materials in electronic devices or high-end equipment are gradually increasing; among them, tellurium copper alloy, as a metal material with good conductivity and good processing formability, occupies an important position in many industries and is widely used in electronics, electrical, machinery manufacturing and other industries.

[0003] In the prior art, the heat resistance and mechanical properties of tellurium copper alloys still have certain limitations. Traditional tellurium copper alloys are mainly composed of basic metal elements such as copper and tellurium. Under high temperature conditions, the thermal motion of atoms inside the alloy intensifies, and the stability of the atomic arrangement in the crystal structure is destroyed. On the one hand, the dislocation movement inside the alloy becomes more frequent and disordered, resulting in a significant reduction in the strength and hardness of the alloy; on the other hand, the atomic diffusion effect caused by high temperature causes the elements at the grain boundaries to segregate, weakening the grain boundary bonding force and further reducing the overall mechanical properties of the alloy. For example, in the heat dissipation module of high-power electronic equipment, when the chip is in a high-temperature working state for a long time, the heat sink made of traditional tellurium copper alloy cannot continuously and efficiently conduct heat away due to insufficient heat resistance, which will not only cause the operating temperature of the equipment to be too high, causing the performance of electronic components to decline, but also affect the stability of the internal structure 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 connection parts will increase significantly after being heated for a long time, resulting in reduced power transmission efficiency and even causing local overheating, posing serious safety hazards.

[0004] In summary, it is of great significance to solve the above problems and prepare a high heat-resistant tellurium copper alloy strip. Summary of the invention

[0005] The object of the present invention is to provide a high heat-resistant tellurium-copper alloy strip and a preparation process thereof, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A preparation process of a high heat-resistant tellurium-copper alloy strip comprises the following steps:

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

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

[0010] More optimally, the high heat-resistant tellurium-copper alloy strip comprises the following components: 0.1wt% to 0.5wt% tellurium, 0.01 to 0.03wt% cerium, 0.05 to 0.15wt% selenium, impurity content <0.3wt%, and the rest is copper.

[0011] More optimally, in the mixed smelting process, copper-phosphorus alloy and calcium hexaboride in a mass ratio of 0.2:9.8 are used as deoxidizers, charcoal and graphite phosphorus in a mass ratio of 1:4 are used as covering agents, and the smelting temperature is 1150-1250°C; in the semi-continuous casting process, the pouring temperature is 1100-1200°C, the casting rate is 40-60 mm / min, and the crystallizer temperature is 200-300°C.

[0012] More optimally, during the homogenization annealing process, the temperature is 900-950°C and the time is 3-8 hours; during the hot rolling process, the hot rolling temperature is 950-980°C, the rolling rate is 200-300m / min, water-cooled quenching, and the total processing rate is 90-95%; during the solution annealing process, the temperature is 1000-1100°C, the rate is 100-150m / min; during the aging treatment process, the aging temperature is 300-500°C, 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°C, and the rate is 50-100m / min.

[0013] Preferably, the base casting is pre-clad with a reinforcement layer, and the specific process of step 2 is: (1) preheating the base casting to 500-650°C; spraying boron carbide composite powder; laser cladding to form a reinforcement layer; obtaining a coated casting; (2) subjecting the coated casting to homogenization annealing, hot rolling, solution annealing, aging treatment, secondary rolling, and stress relief annealing in sequence to obtain a high heat-resistant tellurium copper alloy strip.

[0014] More optimally, the spraying is plasma spraying, the powder feeding rate is 10-15g / min, and the nozzle distance is 10-20mm; 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.

[0015] More optimally, the preparation method of the boron carbide composite powder is as follows: (1) placing boron carbide in an alkaline solution, a roughening solution, a sensitizing solution, and an activating solution for treatment in sequence; then transferring it to a nickel plating solution, stirring it at 80 to 85° C. for 1 to 2 hours, washing it, and vacuum drying it at 120 to 150° C. to obtain modified boron carbide; (2) grinding and mixing electrolytic copper powder, modified boron carbide, silicon powder, and zirconium powder to obtain a boron carbide composite powder.

[0016] More optimally, the nickel plating solution includes 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 water, and 500-520g deionized water.

[0017] More optimally, the boron carbide composite powder includes the following components by mass: 100 parts of electrolytic copper powder, 1.5-2.5 parts of modified boron carbide, 0.5-1 parts of silicon powder, and 1-2 parts of zirconium powder.

[0018] A high heat-resistant tellurium-copper alloy strip is prepared by a preparation process of the high heat-resistant tellurium-copper alloy strip.

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

[0020] Among them, selenium can produce Cu2Se dispersed particles in copper, organize dislocation movement and grain growth, improve the refinement and density of the internal structure of the alloy, thereby effectively strengthening the tellurium copper alloy and enhancing the mechanical properties. The introduction of this element can effectively hinder atomic diffusion and dislocation movement at high temperatures, thereby inhibiting deformation at high temperatures. Cerium is a rare earth element that can promote nucleation particles and facilitate grain refinement, thereby purifying copper grain boundaries, reducing the segregation of harmful elements such as impurities at grain boundaries, and promoting the mechanical properties of tellurium copper alloys. At the same time, it can improve oxidation resistance, form a dense oxide film under high temperature conditions, and further oxidize the internal structure. The introduction of both requires regulation due to their solid solubility. If the ratio is inappropriate, it may lead to an increase in brittle phases, which in turn reduces the mechanical properties and heat shock resistance of the material.

[0021] Among them, a reinforcement layer is formed on its surface by laser cladding technology; while improving the strength of the tellurium copper alloy strip, the thermal conductivity is effectively enhanced, thereby improving the heat resistance and increasing its service life. In the scheme, the base casting is preheated, which is equivalent to thermal activation, which can not only effectively buffer the internal stress of the spraying, but also promote the physical and chemical reaction between the surface and the spraying powder, promote the powder deposition efficiency, and increase the bonding strength; the temperature needs to be limited. If it is too low, there will be a temperature difference, which is easy to produce cracks and affect the overall strength. At the same time, a static magnetic field is set in the laser cladding, which can make the surface reinforcement layer more evenly distributed, reduce segregation, and improve the uniformity of the coating. At the same time, when the laser is mutually dissolved under the action of the magnetic field, a finer surface structure can be grown, pores and defects can be reduced, thereby effectively improving the surface strength, heat resistance and conductivity. In addition, the laser cladding is a boron carbide composite powder, which is obtained by mixing electrolytic copper powder with a certain proportion of modified boron carbide, silicon powder and zirconium powder. The surface of the modified boron carbide carries nickel and silver, which helps to improve its contact with the metal interface and improve the bonding strength of the reinforcement layer. The introduction of modified boron carbide can significantly improve the strength of the composite layer, effectively improve thermal conductivity, and enhance high temperature resistance. In addition, under high-power laser cladding, boron carbide can form ZrB with zirconium and silicon. 2 -SiC; due to ZrB 2 It has better electrical conductivity and heat resistance; it effectively promotes the improvement of the comprehensive performance of tellurium copper alloy strip by the surface layer. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that the following parts are calculated by weight, and the purchasing manufacturers of all raw materials involved in the present invention are exemplified without any special restrictions: in the following embodiments, the purity of electrolytic copper is 99.99%, the purity of pure tellurium is 99.99%, the copper-cerium intermediate 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, which are purchased from Aladdin; the above and other raw materials are commercially purchased.

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

[0025] Embodiment 1: A process for preparing 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) placing boron carbide in a 1 mol / L sodium hydroxide aqueous solution and stirring for 10 minutes, filtering, washing and drying; transferring to a roughening solution containing 1 g / mL hydrogen peroxide and 1 g / mL nitric acid and stirring for 5 minutes, filtering, washing and drying; transferring to a sensitizing solution containing 0.025 g / mL stannous chloride and 0.1 g / mL hydrochloric acid and stirring for 5 minutes, filtering, washing and drying; transferring to an activation solution containing 0.03 g / mL nickel chloride, 0.03 g / mL sodium hypophosphite and 0.6 g / mL ethanol and stirring for 10 minutes, filtering, washing and drying; then transferring to a nickel plating solution, stirring at 80°C for 2 hours, washing, and vacuum drying at 150°C to obtain modified boron carbide; wherein the nickel plating solution comprises 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°C, add electrolytic copper, deoxidizer, and covering agent; add pure tellurium, pure selenium, and copper-cerium master alloy in sequence, mix and melt at 1200°C, and then perform semi-continuous casting, during which: the casting temperature is 1180°C, the casting rate is 60mm / min, and the crystallizer temperature is 280°C; obtain the basic casting; wherein the deoxidizer accounts for 0.5wt% of the total amount of all metals; the covering agent accounts for 0.3wt% of the total amount of all metals;

[0028] Step 2: (1) preheat the base casting to 600°C; 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 reinforcement layer; obtain the plated casting; (2) perform homogenization annealing on the plated casting in sequence, during which the temperature is 950°C and the time is 5 hours; hot rolling , process: hot rolling temperature is 980℃, rolling rate is 200m / min, water cooling quenching, total processing rate is 95%; solution annealing, process: temperature is 1000℃, rate is 150m / min; aging treatment, process: aging temperature is 450℃, aging time is 3 hours; second rolling, process is cold rolling, total processing rate is 65%; stress relief annealing, process: temperature is 380℃, rate is 60m / min, high heat-resistant tellurium copper alloy strip is obtained;

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

[0030] Embodiment 2: A process for preparing 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) placing boron carbide in a 1 mol / L sodium hydroxide aqueous solution and stirring for 10 minutes, filtering, washing and drying; transferring to a roughening solution containing 1 g / mL hydrogen peroxide and 1 g / mL nitric acid and stirring for 5 minutes, filtering, washing and drying; transferring to a sensitizing solution containing 0.025 g / mL stannous chloride and 0.1 g / mL hydrochloric acid and stirring for 5 minutes, filtering, washing and drying; transferring to an activation solution containing 0.03 g / mL nickel chloride, 0.03 g / mL sodium hypophosphite and 0.6 g / mL ethanol and stirring for 10 minutes, filtering, washing and drying; then transferring to a nickel plating solution, stirring at 80°C for 2 hours, washing, and vacuum drying at 150°C to obtain modified boron carbide; wherein the nickel plating solution comprises 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°C, add electrolytic copper, deoxidizer, and covering agent; add pure tellurium, pure selenium, and copper-cerium master alloy in sequence, mix and melt at 1200°C, and then perform semi-continuous casting, during which: the casting temperature is 1180°C, the casting rate is 60mm / min, and the crystallizer temperature is 280°C; obtain the basic casting; wherein the deoxidizer accounts for 0.5wt% of the total amount of all metals; the covering agent accounts for 0.3wt% of the total amount of all metals;

[0033] Step 2: (1) preheat the base casting to 500°C; 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 reinforcement layer; obtain the plated casting; (2) perform homogenization annealing on the plated casting in sequence, during which the temperature is 900°C and the time is 8 hours; hot rolling , process: hot rolling temperature is 950℃, rolling rate is 200m / min, water cooling quenching, total processing rate is 95%; solution annealing, process: temperature is 1100℃, rate is 100m / min; aging treatment, process: aging temperature is 500℃, aging time is 3 hours; second rolling, process is cold rolling, total processing rate is 65%; stress relief annealing, process: temperature is 250℃, rate is 50m / min, high heat-resistant tellurium copper alloy strip is obtained;

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

[0035] Embodiment 3: A process for preparing 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) placing boron carbide in a 1 mol / L sodium hydroxide aqueous solution and stirring for 10 minutes, filtering, washing and drying; transferring to a roughening solution containing 1 g / mL hydrogen peroxide and 1 g / mL nitric acid and stirring for 5 minutes, filtering, washing and drying; transferring to a sensitizing solution containing 0.025 g / mL stannous chloride and 0.1 g / mL hydrochloric acid and stirring for 5 minutes, filtering, washing and drying; transferring to an activation solution containing 0.03 g / mL nickel chloride, 0.03 g / mL sodium hypophosphite and 0.6 g / mL ethanol and stirring for 10 minutes, filtering, washing and drying; then transferring to a nickel plating solution, stirring at 80°C for 2 hours, washing, and vacuum drying at 150°C to obtain modified boron carbide; wherein the nickel plating solution comprises 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°C, add electrolytic copper, deoxidizer, and covering agent; add pure tellurium, pure selenium, and copper-cerium master alloy in sequence, mix and melt at 1200°C, and then perform semi-continuous casting, during which: the casting temperature is 1180°C, the casting rate is 60mm / min, and the crystallizer temperature is 280°C; obtain the basic casting; wherein the deoxidizer accounts for 0.5wt% of the total amount of all metals; the covering agent accounts for 0.3wt% of the total amount of all metals;

[0038] Step 2: (1) preheating the base casting to 650°C; spraying boron carbide composite powder, during which the powder feeding rate is 15 g / min and the nozzle distance is 15 mm; laser cladding, during which the auxiliary static magnetic field is 0.5 T, the laser power is 1800 W, the scanning speed is 6 mm / s, and the spot diameter is 3 mm, to form a reinforcement layer; obtaining a plated casting; (2) homogenizing annealing the plated casting in sequence, during which the temperature is 950°C and the time is 3 hours; hot rolling, During the process: hot rolling temperature is 980℃, rolling rate is 300m / min, water cooling quenching, total processing rate is 95%; during solution annealing, temperature is 1000℃, rate is 150m / min; during aging treatment, aging temperature is 300℃, aging time is 4 hours; second rolling, process is cold rolling, total processing rate is 65%; during stress relief annealing, temperature is 400℃, rate is 100m / min, and high heat-resistant tellurium copper alloy strip is obtained;

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

[0040] Comparative Example 1: The components and process of the basic casting are the same as those of Example 1, and the subsequent operations are directly carried out with the basic casting, with the following specific differences:

[0041] Step 2: homogenizing annealing the basic casting in sequence, during which the temperature is 950°C and the time is 5 hours; hot rolling, during which the hot rolling temperature is 980°C, the rolling rate is 200m / min, water cooling quenching, and the total processing rate is 95%; solution annealing, during which the temperature is 1000°C and the rate is 150m / min; aging treatment, during which the aging temperature is 450°C and the aging time is 3 hours; 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°C and the rate is 60m / min, to obtain a high heat-resistant tellurium copper alloy strip;

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

[0043] Comparative Example 2: The process of the basic casting and the process of step 2 are the same as those in Example 1, the metal composition is changed, and the rest is the same as in Example 1, with the following specific differences: 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 rest is copper.

[0044] Comparative Example 3: The components and process of the basic casting are the same as those of Example 1, the preheating temperature before spraying is reduced, and no aging treatment is provided; the specific differences are as follows:

[0045] Step 2: (1) preheating the base casting to 300°C; spraying boron carbide composite powder, during the process: the powder feeding rate is 15g / min, the nozzle distance is 15mm; laser cladding, during the process: 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 reinforcement layer; obtain the plated casting; (2) the plated casting is subjected to homogenization annealing in sequence, during the process: the temperature is 950°C and the time is 5 hours; hot rolling, during the process: the hot rolling temperature is 980°C, the rolling rate is 200m / min, water cooling quenching, and the total processing rate is 95%; solution annealing, during the process: the temperature is 1000°C and the rate is 150m / min; second rolling, the process is cold rolling, and the total processing rate is 65%; stress relief annealing, during the process: the temperature is 380°C and the rate is 60m / min, and a high heat-resistant tellurium copper alloy strip is obtained;

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

[0047] Comparative Example 4: The components and process of the basic casting are the same as those of Example 1, and no static magnetic field is set during the laser plating process; the specific differences are as follows:

[0048] Step 2: (1) preheating the base casting to 600°C; spraying boron carbide composite powder, during which the powder feeding rate is 15 g / min and the nozzle distance is 15 mm; laser cladding, during which the laser power is 1800 W, the scanning speed is 6 mm / s, and the spot diameter is 3 mm, to form a reinforcement layer; obtaining a plated casting; (2) homogenizing annealing the plated casting in sequence, during which the temperature is 950°C and the time is 5 hours; hot rolling, during which: The hot rolling temperature is 980°C, the rolling rate is 200m / min, the water-cooled quenching is performed, and the total processing rate is 95%; during the solution annealing, the temperature is 1000°C and the rate is 150m / min; during the aging treatment, the aging temperature is 450°C and the aging time is 3 hours; the second rolling process is cold rolling and the total processing rate is 65%; during the stress relief annealing, the temperature is 380°C and the rate is 60m / min, and a high heat-resistant tellurium copper alloy strip is obtained;

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

[0050] Comparative Example 5: The components and process of the basic casting are the same as those of Example 1, and 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 modified boron carbide.

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

[0052]

[0053]

[0054] Conclusion: From the data in the above table, it can be seen that: the present application effectively improves the heat resistance of the tellurium copper alloy strip by adjusting the components and the surface laser cladding reinforcement layer; and improves the tensile strength at high temperature. From the data of comparative examples 1 to 5, it can be seen that: in comparison 1, due to the lack of laser cladding reinforcement layer, the relevant performance is reduced; in comparative example 2, due to the lack of introduction of selenium, the mechanical properties and heat resistance are reduced; in comparative example 3, due to the reduction of preheating temperature, the interface effect is reduced, and the relevant performance is reduced. In comparative example 4, due to the lack of setting a static magnetic field, the orderliness is reduced, and the conductivity is reduced; in comparative example 5, due to the lack of introduction of zirconium and silicon, the morphology is changed, and the relevant performance is reduced.

[0055] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A process for preparing a high heat-resistant tellurium-copper alloy strip, characterized in that: The following steps are involved: Step 1: Mix and melt electrolytic copper, pure tellurium, pure selenium and copper-cerium master alloy, and perform semi-continuous casting; Get the basic casting; Step 2: The basic casting is subjected to homogenization annealing, hot rolling, solution annealing, aging treatment, secondary rolling, and stress relief annealing in sequence to obtain a high heat-resistant tellurium copper alloy strip.

2. The process for preparing a high heat-resistant tellurium-copper alloy strip according to claim 1, characterized in that: The high heat-resistant tellurium copper alloy strip comprises the following components: 0.1wt% to 0.5wt% of tellurium, 0.01 to 0.03wt% of cerium, 0.05 to 0.15wt% of selenium, impurity content <0.3wt%, and the rest is copper.

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

4. The process for preparing 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° C. and the time is 3-8 hours; during the hot rolling process, the hot rolling temperature is 950-980° C., the rolling rate is 200-300 m / min, water cooling quenching is performed, and the total processing rate is 90-95%; during the solution annealing process, the temperature is 1000-1100° C. and the rate is 100-150 m / min; during the aging treatment process, the aging temperature is 300-500° C. 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° C. and the rate is 50-100 m / min.

5. The process for preparing a high heat-resistant tellurium-copper alloy strip according to claim 1, characterized in that: The base casting is pre-clad with a reinforcement layer, and the specific process of step 2 is: (1) preheating the base casting to 500-650° C.; spraying boron carbide composite powder; laser cladding to form a reinforcement layer; obtaining a coated casting; (2) subjecting the coated casting to homogenization annealing, hot rolling, solution annealing, aging treatment, secondary rolling, and stress relief annealing in sequence to obtain a high heat-resistant tellurium copper alloy strip.

6. The process for preparing a high heat-resistant tellurium-copper alloy strip according to claim 5, characterized in that: The spraying is plasma spraying, the powder feeding rate is 10-15g / min, and the nozzle distance is 10-20mm; 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.

7. The process for preparing a high heat-resistant tellurium-copper alloy strip according to claim 5, characterized in that: The preparation method of the boron carbide composite powder is as follows: (1) placing boron carbide in an alkali solution, a roughening solution, a sensitizing solution, and an activating solution in sequence for treatment; then transferring the boron carbide to a nickel plating solution, stirring at 80 to 85° C. for 1 to 2 hours, washing, and vacuum drying at 120 to 150° C. to obtain modified boron carbide; (2) Grind and mix electrolytic copper powder, modified boron carbide, silicon powder and zirconium powder to obtain boron carbide composite powder.

8. The process for preparing a high heat-resistant tellurium-copper alloy strip according to claim 7, 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 water, and 500-520g deionized water.

9. The process for preparing a high heat-resistant tellurium-copper alloy strip according to claim 7, characterized in that: The boron carbide composite powder comprises the following components by mass: 100 parts of electrolytic copper powder, 1.5 to 2.5 parts of modified boron carbide, 0.5 to 1 part of silicon powder, and 1 to 2 parts of zirconium powder.

10. A high heat-resistant tellurium-copper alloy strip prepared according to the process for preparing a high heat-resistant tellurium-copper alloy strip according to any one of claims 1 to 9.

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