CN114921678B - Ultrahigh-strength gold material, and preparation method and equipment thereof - Google Patents
Ultrahigh-strength gold material, and preparation method and equipment thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/02—Alloys based on gold
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
- B22D23/06—Melting-down metal, e.g. metal particles, in the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/14—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of noble metals or alloys based thereon
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
- F27B14/061—Induction furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/14—Arrangements of heating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B2014/0837—Cooling arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B2014/0887—Movement of the melt
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses an ultrahigh strength gold material, a preparation method and equipment thereof, wherein a vacuum double-frequency smelting magnetic stirring technology is adopted to ensure homogeneous distribution of a beryllium-cobalt-nickel dispersion strengthening phase, effective heat treatment control is adopted, material rolling and rolling welding are not influenced, a product is subjected to aging treatment to obtain crystal boundary solid solution precipitation strengthening, the hardness reaches HRC (Rockwell hardness) of more than 40, the yield strength is more than 1100MPa, the elongation is 30-50, the oxidation and discoloration resistance is good, a novel functional category of noble metals is developed, and a superhard special elastic functional application prospect is developed.
Description
Technical Field
The invention relates to the technical field of gold preparation, in particular to an ultrahigh-strength gold material, and a preparation method and equipment thereof.
Background
Gold (Gold) is the elemental form of the chemical element Gold (Au), a soft, golden, corrosion-resistant noble metal. Gold belongs to a face-centered cubic lattice structure, has low yield strength (150 MPa), high elongation rate (> 500%), has bright appearance characteristics which are always used in the field of craft ornaments by people, and has high oxidation resistance so as to play an extremely good role in jewelry application and be bright and beautiful and bright. The inelasticity is shown due to the extremely low yield strength of the gold, so that the gold product lacks dynamic texture and can only keep silence and silence. Only by greatly increasing the yield ratio is the only measure for improving and changing the gold. Thus, the metal material technology learns that the goldenrain crystal and the dislocation are effective means for strengthening the crystal lattice. Because gold recovery recrystallization temperature is very low (< 45 ℃), slightly above room temperature can make hardening ineffective, and goldenrain crystal process is ineffective for gold strengthening. Currently, an effective strengthening process for gold is also lacking.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an ultrahigh-strength gold material, a manufacturing method and equipment, which take dislocation strengthening as an entry point and effectively realize the strengthening of the gold material.
In order to achieve the purpose, the invention adopts the following technical scheme:
the ultrahigh-strength gold material is characterized by comprising, by mass, 1.85-2.15% of Be, 0.85-1.05% of Co0.0-1.4% of Ni, 0.13-0.15% of Si and the balance of Au.
The invention also provides a preparation method of the ultrahigh-strength gold material, which is characterized by comprising the following specific steps:
s1, degreasing and purifying all raw materials, weighing according to the metering requirement, and then loading into a graphite boat;
s2, filling the graphite boat into a furnace, and pre-vacuumizing, dehumidifying and degassing;
s3, alloying smelting: controlling the heating rate to be not more than 50 ℃/min under the vacuum degree of 3-10Pa, heating to 800 ℃, filling argon to control the equilibrium pressure to be 500-800Pa, heating and controlling the temperature to be 1150 ℃; in the smelting process, the graphite boat is heated by adopting the double-frequency alternative induction of the single induction coil, and the stirring effect is achieved;
s4, high-speed solid melting: after the smelting is finished, rapidly and directionally cooling molten-state gold liquid in the graphite boat to solidify the molten-state gold liquid to form a solid solution;
s5, annealing: isothermal annealing the solid solution obtained in the step S4 in an ammonia decomposition heat treatment furnace at 780 ℃, and then discharging from the furnace by water cooling;
s6, rolling the solid solution after the water is cooled and discharged from the furnace in the step S5;
s7, manufacturing a product;
s8, aging: and (4) performing low-temperature aging treatment on the product obtained in the step (S7) at the temperature of 300-320 ℃ to realize solid solution strengthening.
The invention also provides equipment for realizing the manufacturing method, which comprises an ultrasonic cleaning machine, a vacuum double-frequency induction rapid-setting ingot casting machine, an ammonia decomposition heat treatment furnace and a double-roller mill; the ultrasonic cleaning machine is used for degreasing and purifying the raw materials; the ammonia decomposition heat treatment furnace is used for carrying out isothermal annealing; the double-roller mill is used for rolling;
the vacuum double-frequency induction rapid-solidification ingot casting machine comprises an outer furnace body, a directional water cooling mechanism, a graphite fiber heat-insulating layer, a double-frequency induction coil and a graphite boat; a graphite boat is arranged in the outer furnace body, and an upper cover of the graphite boat is arranged at an opening at the top of the graphite boat; the graphite fiber heat-insulating layer is arranged around the graphite boat; the double-frequency induction coil is arranged on the outer side of the graphite boat, is connected to a double-frequency power supply and is used for heating the graphite boat and achieving the stirring effect through alternate induction of two frequencies; the directional water cooling mechanism is arranged at the bottom of the graphite boat and used for realizing rapid directional cooling of the graphite boat by controlling the flow rate of cooling water.
Further, the outer furnace body comprises a furnace body upper cover and a furnace body; when the furnace body upper cover is arranged on the furnace body, the furnace body upper cover and the furnace body enclose an inner space of the outer furnace body.
Furthermore, the directional water cooling mechanism comprises a rotary lifting shaft, a water flow heat dissipation plate and a lifting motor, the water flow heat dissipation plate is arranged below the graphite boat, the bottom of the water flow heat dissipation plate is connected to the rotary lifting shaft, the rotary lifting shaft is connected with the lifting motor, and the lifting motor can drive the rotary lifting shaft to lift, so that the water flow heat dissipation plate is driven to rise to be in contact with the bottom of the graphite boat or fall to be separated from the bottom of the graphite boat; and a circulating water channel is arranged in the rotary lifting shaft, and two ends of the circulating water channel are respectively communicated with the inside of the water flow heat dissipation plate and the excessive cold water source pump.
The invention has the beneficial effects that:
1. the method can be used for preparing the superhard gold material, the special antioxidant splendid gloss and excellent yield resistance of the superhard gold material show excellent elastic characteristics, so that the superhard gold material can be realized on a fine wire sheet gold product, the casting is crisp and pleasant, and a gold ringing accessory can be manufactured. The superhard gold belongs to a 23K gold sequence. The invention successfully completes the manufacture of the full-base material and has wide application prospect.
2. The aging solid solution strengthening process is a process route established on the basis of the optimization of a strengthening basic process of integrating various materials, and has unique process advantages.
3. The invention maintains the basic physical characteristics of the gold alloy through double-frequency induction heating stirring, high-speed solidification and low-temperature aging solid solution strengthening, can be processed by cold deformation and hot type precision casting, has good soft ductility and high hard yield ratio, and has wide popularization prospect.
4. The vacuum double-frequency induction rapid-solidification furnace is initiated in China, perfectly solves the segregation phenomenon generated when multi-component alloy is solidified, has excellent dispersion and uniform distribution performance, and has the advantages that the optimal technological parameters of magnetic stirring rapid-solidification are innovative technologies and are stabilized.
5. The invention gives full play to the self-oxidation resistance of gold, so that the solid melting strengthening procedure is easy to realize in a low-cost protective atmosphere furnace, and the basic problem of oxidation and discoloration resistance in the heating process is solved. The technical equipment is miniaturized and the cost is reduced.
6. According to the invention, the experience accumulation is produced according to the K gold product, the produced gold material is expected to form a new high-elasticity elastic product system, and the full-series K gold high-strength hardening standard is completed and established according to the market demand.
In general, the homogeneous distribution of the beryllium-cobalt-nickel dispersion strengthening phase is ensured by the vacuum double-frequency smelting and magnetic stirring technology, effective heat treatment control is carried out, the rolling, rolling and welding of the material are not influenced, the product is subjected to aging treatment to obtain crystal boundary solid solution precipitation strengthening, the hardness reaches HRC (Rockwell hardness) of more than 40, the yield strength of more than 1100MPa, the elongation of 30-50, the oxidation and discoloration resistance is good, the novel functional range of noble metal is expanded, and a superhard special elastic functional application prospect is developed.
Drawings
FIG. 1 is a schematic structural diagram of a vacuum dual-frequency induction rapid solidification furnace in embodiment 3 of the present invention;
FIG. 2 is a schematic representation of solid solution morphology.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.
Example 1
The embodiment provides an ultrahigh-strength gold material which comprises, by mass, be 2%, co 0.95%, ni 1.2%, si 0.14% and the balance of Au.
The gold content of the gold material prepared from the raw materials is equivalent to 23K gold.
Example 2
The embodiment provides a method for manufacturing an ultrahigh-strength gold material in embodiment 1, which comprises the following specific steps:
s1, degreasing and purifying all raw materials, weighing according to the metering requirement, and then loading into a graphite boat;
s2, filling the graphite boat into a furnace, and pre-vacuumizing, dehumidifying and degassing;
s3, alloying smelting: controlling the heating rate to be not more than 50 ℃/min under the vacuum degree of 3-10Pa, heating to 800 ℃, filling argon to control the equilibrium pressure to be 500-800Pa, heating and controlling the temperature to be 1150 ℃; in the smelting process, the graphite boat is heated by adopting the double-frequency alternative induction of the single induction coil, and the stirring effect is achieved;
specifically, the double-frequency alternating induction has a stirring effect, and specifically, a single induction coil is adopted, and melt is forced to agglomerate to achieve a stirring effect by means of time-division wide shear of 100KHz and 40KHz under the same power output condition according to the time interval of 1-10 seconds.
S4, high-speed solid melting: after the smelting is finished, rapidly and directionally cooling molten-state gold liquid in the graphite boat to solidify the molten-state gold liquid to form a solid solution;
s5, annealing: isothermal annealing the solid solution obtained in the step S4 in an ammonia decomposition heat treatment furnace at 780 ℃, and then discharging from the furnace by water cooling;
s6, rolling the solid solution after the water cooling in the step S5: in the embodiment, bidirectional free rolling is adopted, and the feeding amount is 0.2-0.5mm.
S7, manufacturing a product: according to the conventional process, the product is prepared by die pressing, precision casting, tailor welding, extruding, forging and surface decoration polishing.
S8, aging: and (4) performing low-temperature aging treatment on the product obtained in the step (S7) at the temperature of 300-320 ℃ to realize solid solution strengthening.
It should be noted that in the molten metal (the molten metal is equal to the high-temperature solution, and the room-temperature solid is called solid solution), because of different materials, different specific gravities and different solubilities, segregation phenomenon occurs in the slow solidification process, which causes uneven composition. The segregation defect can be effectively solved by adopting double-frequency magnetic stirring and directional rapid solidification in the process of the embodiment. The face-centered cubic structure of gold should obtain (fig. 2 (b)) ordered structural arrangement when being co-fused with infinite mutual soluble elements, actually, the added elements have various lattice structures, the solid solution is easy to obtain partial replacement (fig. 2 (a)) structures and gap (fig. 2 (c)) structures, and as long as the solid solution is ensured to be uniformly distributed, the foundation can be laid for later strengthening. Table 1 shows the lattice radius of the metallic starting material of the gold material of this example.
TABLE 1
Secondly, the practical theory of dislocations is often abbreviated as pinning effect and lattice distortion. Due to different solubilities, the added elements intentionally cause the generation of slip distortion in lattice constants to harden (primary hardening), and part of strengthening elements are precipitated from supersaturated grains to grain boundaries in the aging process to generate a pinning effect (secondary hardening), so that the yield ratio of the material is greatly improved. Practice proves that the yield strength of the material can be improved by 6-10 times through solid solution (intragranular) and aging (grain boundary) strengthening treatment. After the primary solid solution strengthening of gold is finished, the solid solution elements are precipitated and agglomerated along the grain boundary through the isothermal aging strengthening at 300-320 ℃, so that the strengthening effect is achieved, the maximum yield limit can reach 1200MPa, and the hardness is HRC44.
It should be noted that the molten elemental metal is added with the second or multiple metal non-metals to form an alloy, which exists in a solid state form at normal temperature, called solid solution for short, and the added element cannot be completely fused with the main element to form an alloy due to its own physicochemical properties, and is often fused into the crystal in an abnormal bonding form and is retained in the lattice gap. The primary solid solution is a solid solution based on a pure metal, and the secondary solid solution is a solid solution based on an alloy.
It is generally accepted that disordered solid solution atomic arrangements in a thermodynamically equilibrium state are macroscopically homogeneous and microscopically inhomogeneous. Under certain conditions, ordered arrays are often referred to as superlattices.
The noble metal is an element in IB and VIII groups, the metal compound (alloy) belongs to an electron valence compound, the valence rule is not followed, and the electron concentration determines the crystal structure of the noble metal. The electron valence compound is the obtained mesophase compound. Has the characteristics of metal, intermetallic compound with high melting point, high hardness and poor plasticity, and is properly matched with solid solution to strengthen the alloy.
Further studies were made of the effective alloying of the two different materials without the occurrence of excessive alloy phases. This is a zone welding process, using a short range diffusion bonding mechanism to control dissimilar materials. The empirical formula is as follows:
in the formula: k is the precipitation constant of the reaction phase;
A effect(s) of promoting digestion -an effective activation energy of the process;
e-the activation energy of a certain precipitation component atom;
r is gas constant;
t-absolute temperature.
t 0 Is the time for nucleation of the intermetallic compound, the epitaxial film formation thickness y increases with time.
Wherein Q is the growth activation energy of the reaction phase.
According to the particularity of the phase change diffusion connection, the established mathematical model of the generation and growth behaviors of the intermetallic compound phase is good in agreement with the actual experience verification of the model, and the practice proves that the ordered generation of the gold-based intermediate phase is controllable.
By combining the principle of metallurgy and practice verification, the process successfully applies the intermetallic compound to strengthening the gold matrix, improves the gold strength to a brand-new height, fundamentally changes the gold perception concept and fills the blank of inelastic gold. Table 2 shows the comparison between the performance of the ultra-high strength gold material prepared in this example and 24K gold.
TABLE 2
Example 3
The embodiment provides equipment for realizing the method in the embodiment 2, which comprises an ultrasonic cleaning machine, a vacuum double-frequency induction rapid-setting ingot casting machine, an ammonia decomposition heat treatment furnace and a double-roller mill, wherein the ultrasonic cleaning machine is used for cleaning the ingot casting machine; the ultrasonic cleaning machine is used for carrying out degreasing and purification treatment on the raw materials; the ammonia decomposition heat treatment furnace is used for carrying out isothermal annealing; the double-roller mill is used for rolling;
the vacuum double-frequency induction rapid-solidification ingot casting machine is shown in figure 1 and comprises an outer furnace body, a directional water cooling mechanism 20, a graphite fiber heat-insulating layer 30, a double-frequency induction coil 40 and a graphite boat 50; a graphite boat 50 (consisting of a graphite boat outer wall 51 and a graphite platform 52 at the bottom) is arranged in the outer furnace body, and a graphite boat upper cover 41 is arranged at the top opening of the graphite boat 50; the graphite fiber heat-insulating layer 30 is arranged around the graphite boat 50; the dual-frequency induction coil 40 is arranged outside the graphite boat 50, connected to a dual-frequency power supply, and used for heating the graphite boat 50 and achieving a stirring effect (in the embodiment, 100KHz and 40KHz alternate induction) through alternate induction of two frequencies; the directional water cooling mechanism 20 is arranged at the bottom of the graphite boat 50 and is used for realizing rapid directional cooling of the graphite boat 50 by controlling the flow rate of cooling water;
in the embodiment, the outer furnace body comprises a furnace body upper cover 11 and a furnace body 12; when the furnace body upper cover 11 is covered on the furnace body 12, an inner space of the outer furnace body is enclosed between the furnace body upper cover 11 and the furnace body 12.
In this embodiment, the graphite fiber insulating layer 30 is surrounded by an insulating layer upper cover 31, an insulating layer rim 32 and an insulating layer lower layer 33, and is supported by an insulating layer framework 34.
In this embodiment, the directional water cooling mechanism 20 includes a rotary lifting shaft 21, a water flow heat dissipation plate 22, and a lifting motor 24, wherein the water flow heat dissipation plate 22 is disposed below the graphite boat 50, the bottom of the water flow heat dissipation plate 22 is connected to the rotary lifting shaft 21, the rotary lifting shaft 21 is connected to the lifting motor 24, and the lifting motor 24 can drive the rotary lifting shaft 21 to lift, so as to drive the water flow heat dissipation plate 22 to lift to contact with the bottom of the graphite boat 50 or to lift to separate from the bottom of the graphite boat 50; the inside of rotatory lift axle 21 is equipped with circulation water course 211, the both ends of circulation water course 211 respectively with the inside of rivers heating panel 22 with cross cold water source pump 60 intercommunication.
After the smelting is finished, the lifting motor 24 is started to drive the water flow heat dissipation plate 22 to ascend to be in contact with the bottom of the graphite boat 50, the cold water source pump 60 is started to start inputting circulating cooling water to the water flow heat dissipation plate 22, the graphite boat 50 is cooled rapidly and directionally, and therefore rapid condensation of molten metal is achieved.
In this embodiment, a furnace body supporting frame 71 is arranged at the bottom of the furnace body 12, and the upper end of the rotary lifting shaft 22 passes through the furnace body supporting frame 71 and extends into the furnace body 12 to be connected with the water flow heat dissipation plate 22, and is connected with the furnace body supporting frame 71 through a bearing seat 13; and a sealing bearing seat 70 is arranged on the outer side of the furnace body supporting frame 71.
Various corresponding changes and modifications can be made by those skilled in the art based on the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.
Claims (5)
1. The ultrahigh-strength gold material is characterized in that the raw materials comprise, by mass, 1.85-2.15% of Be, 0.85-1.05% of Co0, 1.0-1.4% of Ni, 0.13-0.15% of Si and the balance of Au; the ultrahigh strength gold material has the hardness of HRC (Rockwell hardness) of more than 40, yield strength of more than 1100MPa and elongation of 30-50.
2. The method for preparing the ultrahigh-strength gold material according to claim 1 is characterized by comprising the following specific steps of:
s1, degreasing and purifying all raw materials, weighing according to the metering requirement, and then loading into a graphite boat;
s2, filling the graphite boat into a furnace, and pre-vacuumizing, dehumidifying and degassing;
s3, alloying smelting: controlling the heating rate to be not more than 50 ℃/min under the vacuum degree of 3-10Pa, heating to 800 ℃, filling argon to control the equilibrium pressure to be 500-800Pa, heating and controlling the temperature to be 1150 ℃; in the smelting process, the graphite boat is heated by adopting double-frequency alternate induction of a single induction coil, and the stirring effect is achieved;
s4, high-speed solid melting: after the smelting is finished, rapidly and directionally cooling molten-state gold liquid in the graphite boat to solidify the molten-state gold liquid to form a solid solution;
s5, annealing: isothermal annealing the solid solution obtained in the step S4 in an ammonia decomposition heat treatment furnace at 780 ℃, and then discharging from the furnace by water cooling;
s6, rolling the solid solution after the water is cooled and discharged from the furnace in the step S5;
s7, manufacturing a product;
s8, aging: and (4) performing low-temperature aging treatment on the product obtained in the step (S7) at the temperature of 300-320 ℃ to realize solid solution strengthening.
3. The equipment for realizing the manufacturing method of claim 2 is characterized by comprising an ultrasonic cleaning machine, a vacuum double-frequency induction rapid-setting ingot casting machine, an ammonia decomposition heat treatment furnace and a double-roller mill; the ultrasonic cleaning machine is used for carrying out degreasing and purification treatment on the raw materials; the ammonia decomposition heat treatment furnace is used for carrying out isothermal annealing; the double-roller mill is used for rolling;
the vacuum double-frequency induction rapid-solidification ingot casting machine comprises an outer furnace body, a directional water cooling mechanism, a graphite fiber heat-insulating layer, a double-frequency induction coil and a graphite boat; a graphite boat is arranged in the outer furnace body, and an upper cover of the graphite boat is arranged at an opening at the top of the graphite boat; the graphite fiber heat-insulating layer is arranged around the graphite boat; the double-frequency induction coil is arranged on the outer side of the graphite boat, is connected to a double-frequency power supply and is used for heating the graphite boat through alternate induction of two frequencies and achieving the effect of stirring; the directional water cooling mechanism is arranged at the bottom of the graphite boat and used for realizing rapid directional cooling of the graphite boat by controlling the flow speed of cooling water.
4. The apparatus of claim 3, wherein the outer furnace body comprises a furnace body upper cover and a furnace body; when the furnace body upper cover is arranged on the furnace body, the furnace body upper cover and the furnace body enclose an inner space of the outer furnace body.
5. The apparatus of claim 3, wherein the directional water cooling mechanism comprises a rotary lifting shaft, a water flow heat dissipation plate and a lifting motor, the water flow heat dissipation plate is arranged below the graphite boat, the bottom of the water flow heat dissipation plate is connected to the rotary lifting shaft, the rotary lifting shaft is connected with the lifting motor, and the lifting motor can drive the rotary lifting shaft to lift, so that the water flow heat dissipation plate is driven to rise to be in contact with the bottom of the graphite boat or fall to be separated from the bottom of the graphite boat; and a circulating water channel is arranged in the rotary lifting shaft, and two ends of the circulating water channel are respectively communicated with the inside of the water flow heat dissipation plate and the supercooled water source pump.
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| CN114686719B (en) * | 2022-03-28 | 2023-04-28 | 重庆材料研究院有限公司 | High-strength gold wire material and preparation method thereof |
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