High-strength bonding alloy wire and process for producing the same

Abstract

The application relates to the technical field of bonding gold wires, in particular to a high-strength bonding gold wire and a production process thereof, which comprises the following steps: taking raw materials according to weight percentages: copper 0.002-0.003 wt%, magnesium 0.001-0.002 wt%, calcium 0.0002-0.0008 wt%, palladium 0.0005-0.002 wt%, cerium-boron additive 0.001-0.002 wt%, and the balance being gold. The bonding gold wire of the application adopts copper, magnesium, calcium and other raw materials to be blended, and cerium-boron additive is added to cooperate and synergize, then the bonding gold wire is subjected to melting, single-crystal continuous casting, immersion treatment in a lubricating liquid, multi-pass wire drawing, reheat adjustment and improvement treatment, and finally the bonding strength, elongation rate and resistivity performance of the obtained bonding gold wire are remarkably improved; meanwhile, the product is excellent in oxidation resistance and corrosion resistance, and the comprehensive coordination of the product is excellent.

Description

Technical Field

[0001] This invention relates to the field of bonding wire technology, specifically to a high-strength bonding wire and its manufacturing process. Background Technology

[0002] Bonding wires are important components in semiconductors, often used as internal leads in microelectronic packaging. They are essential basic materials for integrated circuits and semiconductor components. In actual production, bonding wires are mainly divided into several types: JC2, JC3, JE1, and JE2, which have different chemical compositions, electrical properties, and mechanical properties.

[0003] Existing bonding wires, in order to optimize the bonding strength of the product, tend to reduce the product's elongation and resistivity, resulting in poor product compatibility. At the same time, the product has poor oxidation resistance and corrosion resistance, which further limits the product's efficiency. Based on this, the present invention further improves the product. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the purpose of this invention is to provide a high-strength bonding alloy wire and its manufacturing process to solve the problems mentioned in the background art.

[0005] The present invention solves the technical problem by adopting the following technical solution:

[0006] This invention provides a manufacturing process for high-strength bonding alloy wire, comprising the following steps:

[0007] Step 1: Weigh the raw materials according to the following weight percentages: copper 0.002~0.003wt%, magnesium 0.001~0.002wt%, calcium 0.0002~0.0008wt%, palladium 0.0005~0.002wt%, cerium-boron additive 0.001~0.002wt%, and the balance is gold;

[0008] Step 2: Add the above raw materials to the melting machine and melt them completely. Then, perform single-crystal continuous casting to obtain a single-crystal gold rod. Immerse the single-crystal gold rod in a sufficient amount of lubricating liquid for wetting treatment. After the treatment is completed, a lubricated gold rod body is obtained.

[0009] Step 3: The lubricated gold rod is drawn into wire multiple times and then heat-treated to improve its properties, thus obtaining a high-strength bonded gold wire.

[0010] Preferably, the single crystal continuous casting uses a circulating cooling water cooling crystallizer, and the continuous casting speed is controlled at 10~15cm / min, forming a single crystal gold rod with a diameter of 5~10mm by pull casting;

[0011] The specific process of multi-pass wire drawing is as follows:

[0012] The single-crystal gold rod was subjected to coarse pulling, intermediate pulling, fine pulling, and final pulling in sequence. The target diameter for coarse pulling was 900~1000μm, and the speed was 12~15m / min; the target diameter for intermediate pulling was 400~500μm, and the speed was 110~120m / min; the target diameter for fine pulling was 100~150μm, and the speed was 300~350m / min; the target diameter for final pulling was 8~18μm, and the speed was 500~550m / min.

[0013] The impregnation pressure for the impregnation treatment is 15~20MPa, the impregnation time is 1h, and the ultrasonic power for impregnation is 350~450W.

[0014] Preferably, the preparation method of the cerium-boron additive is as follows:

[0015] S01: Add 3-5 parts by weight of lanthanum chloride solution and 2-4 parts by weight of bismuth oxide to 8-12 parts by weight of sodium dodecylbenzenesulfonate solution and stir until homogeneous to obtain a mixed solution;

[0016] S02: Silica, niobium powder and indium powder are mixed evenly in a weight ratio of (5~7):(3~5):3 to obtain a blend; the blend and 8% sodium citrate solution are stirred thoroughly in a weight ratio of (5~8):12 to obtain silica liquid;

[0017] 4-7 parts by weight of cerium powder and 8-12 parts by weight of silica liquid are mixed evenly to obtain an additive; the additive and the blending liquid are stirred at a weight ratio of (5-8):11. After stirring, a cerium-based additive-blended liquid is obtained.

[0018] S03: The cerium-based additive solution and boron feed were ball-milled at a weight ratio of (11~15):5, with a ball milling speed of 1000~1500 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain the cerium-boron additive.

[0019] Preferably, the lanthanum chloride solution has a mass fraction of 5-8%; the sodium dodecylbenzenesulfonate solution has a mass fraction of 10-15%; and the stirring speed is 450-550 r / min for 1 h.

[0020] Preferably, the method for preparing the boron feedstock is as follows:

[0021] β-Cyclodextrin, silane coupling agent KH550, and ethanol solution are thoroughly mixed at a weight ratio of (3~5):1:(6~8) to obtain β-cyclodextrin solution; 2~5 parts by weight of boron powder, 1~3 parts by weight of vanadium powder, and 2~4 parts by weight of yttrium nitrate solution are mixed evenly, and then 2~5 parts by weight of β-cyclodextrin solution are added for ultrasonic treatment, followed by filtration and drying to obtain boron feed.

[0022] Lanthanum chloride, bismuth oxide, and sodium dodecylbenzenesulfonate in the blending solution play a dispersing and stabilizing role. Sodium dodecylbenzenesulfonate, as a surfactant, reduces the interfacial tension of each component, allowing lanthanum chloride and bismuth oxide to be evenly dispersed, laying the foundation for subsequent bonding with the cerium-based system.

[0023] In the boron feed preparation, the inclusion effect of β-cyclodextrin, combined with the compatibility optimization of silane coupling agent KH550, makes it difficult for boron powder and vanadium powder to agglomerate; ultrasonic treatment further disperses fine particles, ensuring that boron is evenly distributed in the additive; high-speed ball milling achieves deep fusion of cerium-based additive liquid and boron feed, resulting in uniform particle size of the final additive particles, and no local enrichment of components after addition to the gold matrix;

[0024] The combination of cerium powder and molten silica allows silica to provide a carrier for cerium, enabling it to form uniformly distributed "anti-oxidation sites" in the alloy. The rare earth properties of cerium can quickly generate a dense oxide film, preventing the gold matrix from being oxidized. The synergistic effect of boron powder, vanadium powder, and yttrium nitrate enhances the chemical stability of the alloy surface, while the yttrium in the vanadium powder and yttrium nitrate helps optimize the oxide film structure, making the oxide film denser and less prone to peeling off, significantly improving the corrosion resistance of the alloy wire in high-temperature and humid environments.

[0025] The composite system of silica, niobium powder, and indium powder can serve as a heterogeneous nucleation core during alloy melting and solidification, refining the grain size of the gold matrix and reducing internal defects. The uniform dispersion of the additives makes the grain refinement effect more comprehensive. Combined with subsequent wire drawing and heat treatment processes, it further enhances the bonding strength and toughness of the alloy wire, achieving a synergistic effect of "high strength + high elongation".

[0026] Preferably, the ethanol solution has a mass fraction of 85-90%; the yttrium nitrate solution has a mass fraction of 4-6%; the ultrasonic power for ultrasonic treatment is 450-550W, and the ultrasonic treatment lasts for 2 hours.

[0027] Preferably, the method for preparing the wetting fluid is as follows:

[0028] S11: Mix 1-2 parts by weight of silane coupling agent KH560, 3-5 parts by weight of sodium lignosulfonate solution with a mass fraction of 4-7%, 2-3 parts by weight of ethanol and 1-2 parts by weight of sorbitan monooleate to obtain a mediator liquid.

[0029] S12: Carbon nanotubes and hydroxyapatite liquid are stirred evenly at a weight ratio of 3:(5~8), then filtered and dried to obtain carbon nanotube agent; The preparation method of the hydroxyapatite liquid is as follows: hydroxyapatite, silicon carbide and sodium alginate solution with a mass fraction of 5~7% are stirred thoroughly at a weight ratio of (2~4):(1~2):7 to obtain hydroxyapatite liquid;

[0030] S13: Stir boron nitride in a sufficient amount of 8% potassium permanganate solution until homogeneous, then wash with water, filter, and dry to obtain dry boron nitride; 4-7 parts by weight of dry boron nitride, 2-5 parts by weight of carbon nanotube agent and 3-5 parts by weight of mullite whiskers are blended and sintered for 1 hour. After sintering, a sintered body is obtained; the sintered body and the medium liquid are stirred evenly at a weight ratio of 5:(8-11) to obtain a wettable liquid.

[0031] The synergistic effect of the composite surfactants in the mediator fluid, with the combination of sorbitan monooleate (nonionic) and sodium lignosulfonate (anionic), significantly reduces the surface tension of the lubricating fluid and improves the wetting and spreading properties on the gold rod surface. Ethanol, as a co-solvent, further optimizes the fluidity of the lubrication system. Boron nitride is activated and improved with potassium permanganate solution, and then combined with mullite whiskers and carbon nanotube agents for synergistic effect. The carbon nanotubes, hydroxyapatite, and silicon carbide in the carbon nanotube agent are blended and optimized. Through the co-combination and synergistic effect of the raw materials, and after sintering improvement, they enhance each other. The sintered body, combined with the mediator fluid in the system, further enhances the interfacial effect of the product. At the same time, with the addition of heat conditioning improvement treatment, the grains are refined and the functional effect of the product is optimized, thereby further improving the product performance.

[0032] Preferably, the sintering temperature of the blending sintering is 245~255℃.

[0033] Preferably, the specific method for the thermal adjustment improvement treatment is as follows:

[0034] First, heat the material to 580-600℃ at a rate of 10-15℃ / min and hold for 15-20 minutes. Then, cool it to 480-490℃ at a rate of 5-10℃ / min and hold for 20 minutes. Next, cool it to 300-320℃ at a rate of 8-12℃ / min and hold for 30-40 minutes. Finally, cool it to room temperature at a rate of 3-5℃ / min.

[0035] The present invention also provides a high-strength bonding wire, which is produced by the manufacturing process of the aforementioned high-strength bonding wire.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The bonding wire of this invention is made from a blend of copper, magnesium, and calcium, with cerium-boron additives added for synergistic enhancement. After melting, single-crystal continuous casting, and wetting in a lubricating solution, followed by multiple drawing passes and heat treatment, the resulting bonding wire exhibits significantly improved bonding strength, elongation, and resistivity. Furthermore, the product demonstrates excellent oxidation and corrosion resistance, exhibiting superior overall performance. The combination of palladium and cerium-boron additives refines the grain structure and reduces internal defects, allowing the alloy wire to maintain both high strength and good elongation, meeting the requirements of the encapsulation process. To address the bending and bonding requirements, a heat treatment process is used to specifically eliminate internal stress: a segmented heating-holding-cooling heat treatment process gradually releases the internal stress generated by multiple wire drawing processes, optimizes the metal microstructure, avoids "hardening and embrittlement," and achieves a balance between strength and toughness; the rare earth properties of cerium can form a dense oxide film, preventing the gold matrix from being oxidized; boron works synergistically with other components to improve the surface stability of the alloy and reduce the risk of corrosion from corrosive media; the auxiliary strengthening of palladium, with the addition of a small amount of palladium, further enhances the chemical inertness of the alloy and optimizes the performance stability of the product. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. 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.

[0039] The production process of a high-strength bonding alloy wire according to this embodiment includes the following steps:

[0040] Step 1: Weigh the raw materials according to the following weight percentages: copper 0.002~0.003wt%, magnesium 0.001~0.002wt%, calcium 0.0002~0.0008wt%, palladium 0.0005~0.002wt%, cerium-boron additive 0.001~0.002wt%, and the balance is gold;

[0041] Step 2: Add the above raw materials to the melting machine and melt them completely. Then, perform single-crystal continuous casting to obtain a single-crystal gold rod. Immerse the single-crystal gold rod in a sufficient amount of lubricating liquid for wetting treatment. After the treatment is completed, a lubricated gold rod body is obtained.

[0042] Step 3: The lubricated gold rod is drawn into wire multiple times and then heat-treated to improve its properties, thus obtaining a high-strength bonded gold wire.

[0043] In this embodiment, the single crystal continuous casting uses circulating cooling water to cool the crystallizer, and the continuous casting speed is controlled at 10~15cm / min, forming a single crystal gold rod with a diameter of 5~10mm by pulling and casting.

[0044] The specific process of multi-pass wire drawing is as follows:

[0045] The single-crystal gold rod was subjected to coarse pulling, intermediate pulling, fine pulling, and final pulling in sequence. The target diameter for coarse pulling was 900~1000μm, and the speed was 12~15m / min; the target diameter for intermediate pulling was 400~500μm, and the speed was 110~120m / min; the target diameter for fine pulling was 100~150μm, and the speed was 300~350m / min; the target diameter for final pulling was 8~18μm, and the speed was 500~550m / min.

[0046] The impregnation pressure for the impregnation treatment is 15~20MPa, the impregnation time is 1h, and the ultrasonic power for impregnation is 350~450W.

[0047] The preparation method of the cerium-boron additive in this embodiment is as follows:

[0048] S01: Add 3-5 parts by weight of lanthanum chloride solution and 2-4 parts by weight of bismuth oxide to 8-12 parts by weight of sodium dodecylbenzenesulfonate solution and stir until homogeneous to obtain a mixed solution;

[0049] S02: Silica, niobium powder and indium powder are mixed evenly in a weight ratio of (5~7):(3~5):3 to obtain a blend; the blend and 8% sodium citrate solution are stirred thoroughly in a weight ratio of (5~8):12 to obtain silica liquid;

[0050] 4-7 parts by weight of cerium powder and 8-12 parts by weight of silica liquid are mixed evenly to obtain an additive; the additive and the blending liquid are stirred at a weight ratio of (5-8):11. After stirring, a cerium-based additive-blended liquid is obtained.

[0051] S03: The cerium-based additive solution and boron feed were ball-milled at a weight ratio of (11~15):5, with a ball milling speed of 1000~1500 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain the cerium-boron additive.

[0052] In this embodiment, the lanthanum chloride solution has a mass fraction of 5-8%; the sodium dodecylbenzenesulfonate solution has a mass fraction of 10-15%; and the stirring speed is 450-550 r / min for 1 h.

[0053] The method for preparing the boron feed in this embodiment is as follows:

[0054] β-Cyclodextrin, silane coupling agent KH550, and ethanol solution are thoroughly mixed at a weight ratio of (3~5):1:(6~8) to obtain β-cyclodextrin solution; 2~5 parts by weight of boron powder, 1~3 parts by weight of vanadium powder, and 2~4 parts by weight of yttrium nitrate solution are mixed evenly, and then 2~5 parts by weight of β-cyclodextrin solution are added for ultrasonic treatment, followed by filtration and drying to obtain boron feed.

[0055] In this embodiment, the ethanol solution has a mass fraction of 85-90%; the yttrium nitrate solution has a mass fraction of 4-6%; the ultrasonic power for ultrasonic treatment is 450-550W, and the ultrasonic treatment lasts for 2 hours.

[0056] The preparation method of the wetting fluid in this embodiment is as follows:

[0057] S11: Mix 1-2 parts by weight of silane coupling agent KH560, 3-5 parts by weight of sodium lignosulfonate solution with a mass fraction of 4-7%, 2-3 parts by weight of ethanol and 1-2 parts by weight of sorbitan monooleate to obtain a mediator liquid.

[0058] S12: Carbon nanotubes and hydroxyapatite liquid are stirred evenly at a weight ratio of 3:(5~8), then filtered and dried to obtain carbon nanotube agent; The preparation method of the hydroxyapatite liquid is as follows: hydroxyapatite, silicon carbide and sodium alginate solution with a mass fraction of 5~7% are stirred thoroughly at a weight ratio of (2~4):(1~2):7 to obtain hydroxyapatite liquid;

[0059] S13: Stir boron nitride in a sufficient amount of 8% potassium permanganate solution until homogeneous, then wash with water, filter, and dry to obtain dry boron nitride; 4-7 parts by weight of dry boron nitride, 2-5 parts by weight of carbon nanotube agent and 3-5 parts by weight of mullite whiskers are blended and sintered for 1 hour. After sintering, a sintered body is obtained; the sintered body and the medium liquid are stirred evenly at a weight ratio of 5:(8-11) to obtain a wettable liquid.

[0060] The sintering temperature for the blending sintering in this embodiment is 245~255℃.

[0061] The specific method for improving thermal regulation in this embodiment is as follows:

[0062] First, heat the material to 580-600℃ at a rate of 10-15℃ / min and hold for 15-20 minutes. Then, cool it to 480-490℃ at a rate of 5-10℃ / min and hold for 20 minutes. Next, cool it to 300-320℃ at a rate of 8-12℃ / min and hold for 30-40 minutes. Finally, cool it to room temperature at a rate of 3-5℃ / min.

[0063] The high-strength bonding wire of this embodiment is produced by the manufacturing process of the aforementioned high-strength bonding wire.

[0064] Example 1: A production process for high-strength bonding alloy wire, comprising the following steps:

[0065] Step 1: Weigh the raw materials according to the following weight percentages: copper 0.002wt%, magnesium 0.001wt%, calcium 0.0002wt%, palladium 0.0005wt%, cerium-boron additive 0.001wt%, and the balance is gold;

[0066] Step 2: Add the above raw materials to the melting machine and melt them completely. Then, perform single-crystal continuous casting to obtain a single-crystal gold rod. Immerse the single-crystal gold rod in a sufficient amount of lubricating liquid for wetting treatment. After the treatment is completed, a lubricated gold rod body is obtained.

[0067] Step 3: The lubricated gold rod is drawn into wire multiple times and then heat-treated to improve its properties, thus obtaining a high-strength bonded gold wire.

[0068] In this embodiment, the single crystal continuous casting uses circulating cooling water to cool the crystallizer, and the continuous casting speed is controlled at 10cm / min, forming a single crystal gold rod with a diameter of 5mm by pulling and casting.

[0069] The specific process of multi-pass wire drawing is as follows:

[0070] The single-crystal gold rod was subjected to coarse pulling, intermediate pulling, fine pulling, and final pulling in sequence. The target diameter for coarse pulling was 900 μm, and the speed was 12 m / min; the target diameter for intermediate pulling was 400 μm, and the speed was 110 m / min; the target diameter for fine pulling was 100 μm, and the speed was 300 m / min; and the target diameter for final pulling was 8 μm, and the speed was 500 m / min.

[0071] The impregnation pressure was 15 MPa, the impregnation time was 1 hour, and the ultrasonic power for impregnation was 350 W.

[0072] The preparation method of the cerium-boron additive in this embodiment is as follows:

[0073] S01: Add 3 parts by weight of lanthanum chloride solution and 2 parts by weight of bismuth oxide to 8 parts by weight of sodium dodecylbenzenesulfonate solution and stir until homogeneous to obtain a mixed solution;

[0074] S02: Silica, niobium powder, and indium powder are mixed evenly in a weight ratio of 5:3:3 to obtain a blend; the blend and 8% sodium citrate solution are stirred thoroughly in a weight ratio of 5:12 to obtain silica liquid;

[0075] Four parts by weight of cerium powder and eight parts by weight of silica liquid were mixed evenly to obtain an additive; the additive and the blending liquid were stirred at a weight ratio of 5:11. After stirring, a cerium-based additive-blended liquid was obtained.

[0076] S03: The cerium-based additive solution and boron feed were ball-milled at a weight ratio of 11:5 at a speed of 1000 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain the cerium-boron additive.

[0077] In this embodiment, the lanthanum chloride solution has a mass fraction of 5%; the sodium dodecylbenzenesulfonate solution has a mass fraction of 15%; the stirring speed is 450 r / min, and the stirring time is 1 h.

[0078] The method for preparing the boron feed in this embodiment is as follows:

[0079] β-Cyclodextrin, silane coupling agent KH550, and ethanol solution were thoroughly mixed at a weight ratio of 3:1:6 to obtain β-cyclodextrin solution. Two parts by weight of boron powder, one part by weight of vanadium powder, and two parts by weight of yttrium nitrate solution were mixed evenly, and then two parts by weight of β-cyclodextrin solution were added and subjected to ultrasonic treatment. After filtration and drying, boron feed was obtained.

[0080] In this embodiment, the ethanol solution has a mass fraction of 85%; the yttrium nitrate solution has a mass fraction of 4%; the ultrasonic power for ultrasonic treatment is 450W, and the ultrasonic treatment lasts for 2 hours.

[0081] The preparation method of the wetting fluid in this embodiment is as follows:

[0082] S11: Mix 1 part by weight of silane coupling agent KH560, 3 parts by weight of 4% sodium lignosulfonate solution, 2 parts by weight of ethanol and 1 part by weight of sorbitan monooleate to obtain a mediator liquid.

[0083] S12: Carbon nanotubes and hydroxyapatite liquid are stirred evenly at a weight ratio of 3:5, then filtered and dried to obtain carbon nanotube agent; The preparation method of the hydroxyapatite liquid is as follows: hydroxyapatite, silicon carbide and 5% sodium alginate solution are stirred thoroughly at a weight ratio of 2:1:7 to obtain hydroxyapatite liquid.

[0084] S13: Boron nitride is stirred evenly in a sufficient amount of 8% potassium permanganate solution, then washed with water, filtered, and dried to obtain dry boron nitride; 4 parts by weight of dry boron nitride, 2 parts by weight of carbon nanotube agent and 3 parts by weight of mullite whiskers are blended and sintered for 1 hour. After sintering, a sintered body is obtained; the sintered body and the medium liquid are stirred evenly at a weight ratio of 5:8 to obtain a wettable liquid.

[0085] The sintering temperature for the blending sintering in this embodiment is 245°C.

[0086] The specific method for improving thermal regulation in this embodiment is as follows:

[0087] First, heat the material to 580℃ at a rate of 10℃ / min and hold for 15 minutes. Then, cool it to 480℃ at a rate of 5℃ / min and hold for 20 minutes. Next, cool it to 300℃ at a rate of 8℃ / min and hold for 30 minutes. Finally, cool it to room temperature at a rate of 3℃ / min.

[0088] The high-strength bonding wire of this embodiment is produced by the manufacturing process of the aforementioned high-strength bonding wire.

[0089] Example 2: A production process for a high-strength bonding alloy wire, comprising the following steps:

[0090] Step 1: Weigh the raw materials according to the following weight percentages: copper 0.003wt%, magnesium 0.002wt%, calcium 0.0008wt%, palladium 0.002wt%, cerium-boron additive 0.002wt%, and the balance is gold;

[0091] Step 2: Add the above raw materials to the melting machine and melt them completely. Then, perform single-crystal continuous casting to obtain a single-crystal gold rod. Immerse the single-crystal gold rod in a sufficient amount of lubricating liquid for wetting treatment. After the treatment is completed, a lubricated gold rod body is obtained.

[0092] Step 3: The lubricated gold rod is drawn into wire multiple times and then heat-treated to improve its properties, thus obtaining a high-strength bonded gold wire.

[0093] In this embodiment, the single crystal continuous casting uses circulating cooling water to cool the crystallizer, and the continuous casting speed is controlled at 15cm / min, forming a single crystal gold rod with a diameter of 10mm by pulling and casting.

[0094] The specific process of multi-pass wire drawing is as follows:

[0095] The single-crystal gold rod was subjected to rough pulling, intermediate pulling, fine pulling, and final pulling in sequence. The target diameter for rough pulling was 1000 μm, and the speed was 15 m / min; the target diameter for intermediate pulling was 500 μm, and the speed was 120 m / min; the target diameter for fine pulling was 150 μm, and the speed was 350 m / min; the target diameter for final pulling was 18 μm, and the speed was 550 m / min.

[0096] The impregnation pressure was 20 MPa, the impregnation time was 1 hour, and the ultrasonic power of the impregnation was 450 W.

[0097] The preparation method of the cerium-boron additive in this embodiment is as follows:

[0098] S01: Add 5 parts by weight of lanthanum chloride solution and 4 parts by weight of bismuth oxide to 12 parts by weight of sodium dodecylbenzenesulfonate solution and stir until homogeneous to obtain a mixed solution;

[0099] S02: Silica, niobium powder and indium powder are mixed evenly in a weight ratio of 7:5:3 to obtain a blend; the blend and 8% sodium citrate solution are stirred thoroughly in a weight ratio of 8:12 to obtain silica liquid;

[0100] Seven parts by weight of cerium powder and 12 parts by weight of silica liquid were mixed evenly to obtain an additive; the additive and the blending liquid were stirred at a weight ratio of 8:11. After stirring, a cerium-based additive-blended liquid was obtained.

[0101] S03: The cerium-based additive solution and boron feed were ball-milled at a weight ratio of 15:5 at a speed of 1500 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain the cerium-boron additive.

[0102] In this embodiment, the lanthanum chloride solution has a mass fraction of 8%; the sodium dodecylbenzenesulfonate solution has a mass fraction of 15%; the stirring speed is 550 r / min, and the stirring time is 1 h.

[0103] The method for preparing the boron feed in this embodiment is as follows:

[0104] β-Cyclodextrin, silane coupling agent KH550, and ethanol solution were thoroughly mixed at a weight ratio of 5:1:8 to obtain β-cyclodextrin solution. 5 parts by weight of boron powder, 3 parts by weight of vanadium powder, and 4 parts by weight of yttrium nitrate solution were mixed evenly, and then 5 parts by weight of β-cyclodextrin solution were added and subjected to ultrasonic treatment. After filtration and drying, boron feed was obtained.

[0105] In this embodiment, the ethanol solution has a mass fraction of 90%; the yttrium nitrate solution has a mass fraction of 6%; the ultrasonic power for ultrasonic treatment is 550W, and the ultrasonic treatment lasts for 2 hours.

[0106] The preparation method of the wetting fluid in this embodiment is as follows:

[0107] S11: Mix 2 parts by weight of silane coupling agent KH560, 5 parts by weight of sodium lignosulfonate solution with a mass fraction of 7%, 3 parts by weight of ethanol and 2 parts by weight of sorbitan monooleate to obtain a mediator liquid.

[0108] S12: Carbon nanotubes and hydroxyapatite liquid are stirred evenly at a weight ratio of 3:8, then filtered and dried to obtain carbon nanotube agent; The preparation method of the hydroxyapatite liquid is as follows: hydroxyapatite, silicon carbide and 7% sodium alginate solution are stirred thoroughly at a weight ratio of 4:2:7 to obtain hydroxyapatite liquid.

[0109] S13: Boron nitride is stirred evenly in a sufficient amount of 8% potassium permanganate solution, then washed with water, filtered, and dried to obtain dry boron nitride; 7 parts by weight of dry boron nitride, 5 parts by weight of carbon nanotube agent and 5 parts by weight of mullite whiskers are blended and sintered for 1 hour. After sintering, a sintered body is obtained; the sintered body and the medium liquid are stirred evenly at a weight ratio of 5:11 to obtain a wettable liquid.

[0110] The sintering temperature for the blending sintering in this embodiment is 255°C.

[0111] The specific method for improving thermal regulation in this embodiment is as follows:

[0112] First, heat the material to 600℃ at a rate of 15℃ / min and hold for 20 min. Then, cool it to 490℃ at a rate of 10℃ / min and hold for 20 min. Next, cool it to 320℃ at a rate of 12℃ / min and hold for 40 min. Finally, cool it to room temperature at a rate of 5℃ / min.

[0113] The high-strength bonding wire of this embodiment is produced by the manufacturing process of the aforementioned high-strength bonding wire.

[0114] Example 3: A production process for a high-strength bonding alloy wire, comprising the following steps:

[0115] Step 1: Weigh the raw materials according to the following weight percentages: copper 0.0025wt%, magnesium 0.0015wt%, calcium 0.0005wt%, palladium 0.001wt%, cerium-boron additive 0.0015wt%, and the balance is gold.

[0116] Step 2: Add the above raw materials to the melting machine and melt them completely. Then, perform single-crystal continuous casting to obtain a single-crystal gold rod. Immerse the single-crystal gold rod in a sufficient amount of lubricating liquid for wetting treatment. After the treatment is completed, a lubricated gold rod body is obtained.

[0117] Step 3: The lubricated gold rod is drawn into wire multiple times and then heat-treated to improve its properties, thus obtaining a high-strength bonded gold wire.

[0118] In this embodiment, the single crystal continuous casting uses circulating cooling water to cool the crystallizer, and the continuous casting speed is controlled at 12.5 cm / min, forming a single crystal gold rod with a diameter of 7.5 mm by pulling and casting.

[0119] The specific process of multi-pass wire drawing is as follows:

[0120] The single-crystal gold rod was subjected to rough pulling, intermediate pulling, fine pulling, and final pulling in sequence. The target diameter for rough pulling was 950 μm, and the speed was 13.5 m / min; the target diameter for intermediate pulling was 450 μm, and the speed was 115 m / min; the target diameter for fine pulling was 125 μm, and the speed was 325 m / min; the target diameter for final pulling was 10 μm, and the speed was 520 m / min.

[0121] The impregnation pressure was 17.5 MPa, the impregnation time was 1 hour, and the ultrasonic power of the impregnation was 400 W.

[0122] The preparation method of the cerium-boron additive in this embodiment is as follows:

[0123] S01: Add 4 parts by weight of lanthanum chloride solution and 3 parts by weight of bismuth oxide to 10 parts by weight of sodium dodecylbenzenesulfonate solution and stir until homogeneous to obtain a mixed solution;

[0124] S02: Silica, niobium powder and indium powder are mixed evenly in a weight ratio of 6:4:3 to obtain a blend; the blend and 8% sodium citrate solution are stirred thoroughly in a weight ratio of 6.5:12 to obtain silica liquid;

[0125] 5.5 parts by weight of cerium powder and 10 parts by weight of silica liquid were mixed evenly to obtain an additive; the additive and the blending liquid were stirred at a weight ratio of 6.5:11. After stirring, a cerium-based additive-blended liquid was obtained.

[0126] S03: The cerium-based additive solution and boron feed were ball-milled at a weight ratio of 13:5 at a speed of 1250 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain the cerium-boron additive.

[0127] In this embodiment, the lanthanum chloride solution has a mass fraction of 6.5%; the sodium dodecylbenzenesulfonate solution has a mass fraction of 12.5%; the stirring speed is 500 r / min, and the stirring time is 1 h.

[0128] The method for preparing the boron feed in this embodiment is as follows:

[0129] β-Cyclodextrin, silane coupling agent KH550, and ethanol solution were thoroughly mixed at a weight ratio of 4:1:7 to obtain β-cyclodextrin solution. 3.5 parts by weight of boron powder, 2 parts by weight of vanadium powder, and 3 parts by weight of yttrium nitrate solution were mixed evenly, and then 3.5 parts by weight of β-cyclodextrin solution were added and subjected to ultrasonic treatment. After filtration and drying, boron feed was obtained.

[0130] In this embodiment, the ethanol solution has a mass fraction of 88%; the yttrium nitrate solution has a mass fraction of 5%; the ultrasonic power for ultrasonic treatment is 500W, and the ultrasonic treatment lasts for 2 hours.

[0131] The preparation method of the wetting fluid in this embodiment is as follows:

[0132] S11: Mix 1.5 parts by weight of silane coupling agent KH560, 4 parts by weight of sodium lignosulfonate solution with a mass fraction of 5.5%, 2.5 parts by weight of ethanol and 1.5 parts by weight of sorbitan monooleate to obtain a mediator liquid.

[0133] S12: Carbon nanotubes and hydroxyapatite solution are stirred evenly at a weight ratio of 3:6.5, then filtered and dried to obtain carbon nanotube agent; The preparation method of the hydroxyapatite solution is as follows: hydroxyapatite, silicon carbide and 6% sodium alginate solution are stirred thoroughly at a weight ratio of 3:1.5:7 to obtain hydroxyapatite solution;

[0134] S13: Boron nitride was stirred evenly in a sufficient amount of 8% potassium permanganate solution, then washed with water, filtered, and dried to obtain dry boron nitride; 5.5 parts by weight of dry boron nitride, 3.5 parts by weight of carbon nanotube agent and 4 parts by weight of mullite whiskers were blended and sintered for 1 hour. After sintering, a sintered body was obtained; the sintered body and the medium liquid were stirred evenly at a weight ratio of 5:9 to obtain a wettable liquid.

[0135] The sintering temperature for the blending sintering in this embodiment is 250°C.

[0136] The specific method for improving thermal regulation in this embodiment is as follows:

[0137] First, heat the material to 590℃ at a rate of 12.5℃ / min and hold for 17.5 min. Then, cool it to 485℃ at a rate of 7.5℃ / min and hold for 20 min. Next, cool it to 310℃ at a rate of 10℃ / min and hold for 35 min. Finally, cool it to room temperature at a rate of 4℃ / min.

[0138] The high-strength bonding wire of this embodiment is produced by the manufacturing process of the aforementioned high-strength bonding wire.

[0139] Comparative Example 1:

[0140] Unlike Example 3, no cerium-boron additive was added.

[0141] Comparative Example 2:

[0142] Unlike Example 3, no cerium-based additive solution was added in the preparation method of the cerium-boron additive.

[0143] Comparative Example 3:

[0144] Unlike Example 3, no mixing solution was added in the preparation of the cerium-based additive solution.

[0145] Comparative Example 4:

[0146] Unlike Example 3, no additives were added in the preparation of the cerium-based additive solution.

[0147] Comparative Example 5:

[0148] Unlike Example 3, no silica liquid was added to the additive.

[0149] Comparative Example 6:

[0150] Unlike Example 3, no niobium powder or indium powder was added to the silica liquid.

[0151] Comparative Example 7:

[0152] Unlike Example 3, no boron was added in the preparation method of the cerium-boron additive.

[0153] Comparative Example 8:

[0154] Unlike Example 3, β-cyclodextrin was not added to the boron feed.

[0155] Comparative Example 9:

[0156] Unlike Example 3, no boron powder or vanadium powder was added in the boron feed.

[0157] Comparative Example 10:

[0158] Unlike Example 3, no wetting liquid treatment was used.

[0159] Comparative Example 11:

[0160] Unlike Example 3, no sintered body was added in the preparation of the wettability liquid.

[0161] Comparative Example 12:

[0162] Unlike Example 3, no dried boron nitride and mullite whiskers were added during the preparation of the sintered body.

[0163] Comparative Example 13:

[0164] Unlike Example 3, no carbon nanotube agent was added during the preparation of the sintered body.

[0165] Comparative Example 14:

[0166] Unlike Example 3, the carbon nanotube agent was not treated with hydroxyapatite solution.

[0167] The products of Examples 1-3 and Comparative Examples 1-14 were tested for bond strength, elongation, resistivity, oxidation resistance (oxidation weight gain, placed in air at 200°C for 100 hours, weighing method) and corrosion resistance (corrosion area percentage, 5% NaCl salt spray test, 35°C, 48 hours). The performance test results are shown in Table 1.

[0168] Table 1. Overall performance test results of the product:

[0169]

[0170] As can be seen from Comparative Examples 1-14 and Examples 1-3, the product of Example 3 exhibits excellent performance coordination in terms of bond strength, elongation, resistivity, oxidation resistance, and corrosion resistance, and the overall coordination improvement effect of the product is significant.

[0171] As can be seen from Comparative Examples 1-14 and Example 3, the performance of the products deteriorated significantly when no cerium-boron additives were added or no lubricating liquid treatment was used. The combined effect of cerium-boron additives and lubricating liquid treatment resulted in the most significant performance improvement.

[0172] In the preparation methods of cerium-boron additives, no cerium-based additive solution is added, no blending solution is added in the preparation of cerium-based additive solution, no additives are added in the preparation of cerium-based additive solution, no silica liquid is added in the additive, no niobium powder or indium powder is added in the silica liquid, no boron feed is added in the preparation methods of cerium-boron additives, no β-cyclodextrin liquid is added in the boron feed, and no boron powder or vanadium powder is added in the boron feed. The performance of the products all tend to deteriorate to varying degrees. The product with the best performance is obtained by using the cerium-based additive solution obtained by the specific method of this invention in combination with boron feed.

[0173] The performance of cerium-boron additives obtained by different methods tends to deteriorate. Only the cerium-boron additive obtained by the method of this invention has the most significant performance effect. At the same time, the performance of the cerium-boron additive is significantly deteriorated when boron is not added in the preparation method. The addition of boron has a significant improving effect on the product.

[0174] In the preparation of the lubricating liquid, no sintered body was added, no dried boron nitride and mullite whiskers were added, no carbon nanotube agent was added, and no hydroxyapatite liquid treatment was used in the preparation of the carbon nanotube agent. As a result, the performance of the product also showed a trend of deterioration to varying degrees. The lubricating liquid obtained by improving the sintered body using the specific method of this invention has the most significant performance effect.

[0175] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0176] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A manufacturing process for high-strength bonding alloy wire, characterized in that, Includes the following steps: Step 1: Weigh the raw materials according to the following weight percentages: copper 0.002~0.003wt%, magnesium 0.001~0.002wt%, calcium 0.0002~0.0008wt%, palladium 0.0005~0.002wt%, cerium-boron additive 0.001~0.002wt%, and the balance is gold; Step 2: Add the above raw materials to the melting machine and melt them completely. Then, perform single-crystal continuous casting to obtain a single-crystal gold rod. Immerse the single-crystal gold rod in a sufficient amount of lubricating liquid for wetting treatment. After the treatment is completed, a lubricated gold rod body is obtained. Step 3: The lubricated gold rod is drawn into wire multiple times and then heat-treated to improve its properties, thus obtaining a high-strength bonded gold wire. The preparation method of the cerium-boron additive is as follows: S01: Add 3-5 parts by weight of lanthanum chloride solution and 2-4 parts by weight of bismuth oxide to 8-12 parts by weight of sodium dodecylbenzenesulfonate solution and stir until homogeneous to obtain a mixed solution; S02: Silica, niobium powder and indium powder are mixed evenly in a weight ratio of (5~7):(3~5):3 to obtain a blend; the blend and 8% sodium citrate solution are stirred thoroughly in a weight ratio of (5~8):12 to obtain silica liquid; 4-7 parts by weight of cerium powder and 8-12 parts by weight of silica liquid are mixed evenly to obtain an additive; the additive and the blending liquid are stirred at a weight ratio of (5-8):

11. After stirring, a cerium-based additive-blended liquid is obtained. S03: The cerium-based additive solution and boron feed were ball-milled at a weight ratio of (11~15):5, with a ball milling speed of 1000~1500 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain the cerium-boron additive. The preparation method of the wettability is as follows: S11: Mix 1-2 parts by weight of silane coupling agent KH560, 3-5 parts by weight of sodium lignosulfonate solution with a mass fraction of 4-7%, 2-3 parts by weight of ethanol and 1-2 parts by weight of sorbitan monooleate to obtain a mediator liquid. S12: Carbon nanotubes and hydroxyapatite liquid are stirred evenly at a weight ratio of 3:(5~8), then filtered and dried to obtain carbon nanotube agent; The preparation method of the hydroxyapatite liquid is as follows: hydroxyapatite, silicon carbide and sodium alginate solution with a mass fraction of 5-7% are stirred thoroughly in a weight ratio of (2-4):(1-2):7 to obtain hydroxyapatite liquid; S13: Stir boron nitride in a sufficient amount of 8% potassium permanganate solution until homogeneous, then wash with water, filter, and dry to obtain dry boron nitride; 4-7 parts by weight of dry boron nitride, 2-5 parts by weight of carbon nanotube agent and 3-5 parts by weight of mullite whiskers are blended and sintered for 1 hour. After sintering, a sintered body is obtained; the sintered body and the medium liquid are stirred evenly at a weight ratio of 5:(8-11) to obtain a wettable liquid.

2. The production process of a high-strength bonding alloy wire according to claim 1, characterized in that, The single crystal continuous casting uses a circulating cooling water to cool the crystallizer, and the continuous casting speed is controlled at 10~15cm / min, forming a single crystal gold rod with a diameter of 5~10mm by pulling and casting. The specific process of the multi-pass wire drawing is as follows: The single crystal gold rod was subjected to rough drawing, intermediate drawing, fine drawing and final drawing in sequence. The target diameter of the rough drawing was 900~1000μm and the speed was 12~15m / min. The target diameter is 400~500μm, and the velocity is 110~120m / min; For the initial pull, the target diameter is 100~150μm, and the speed is 300~350m / min; for the final pull, the target diameter is 8~18μm, and the speed is 500~550m / min. The immersion treatment is performed at an immersion pressure of 15-20 MPa for 1 hour, with an ultrasonic power of 350-450 W.

3. The production process of a high-strength bonding alloy wire according to claim 1, characterized in that, The lanthanum chloride solution has a mass fraction of 5-8%; the sodium dodecylbenzenesulfonate solution has a mass fraction of 10-15%; the stirring speed is 450-550 r / min, and the stirring time is 1 h.

4. The production process of a high-strength bonding alloy wire according to claim 1, characterized in that, The method for preparing the boron feedstock is as follows: β-Cyclodextrin, silane coupling agent KH550, and ethanol solution are thoroughly mixed at a weight ratio of (3~5):1:(6~8) to obtain β-cyclodextrin solution; 2~5 parts by weight of boron powder, 1~3 parts by weight of vanadium powder, and 2~4 parts by weight of yttrium nitrate solution are mixed evenly, and then 2~5 parts by weight of β-cyclodextrin solution are added for ultrasonic treatment, followed by filtration and drying to obtain boron feed.

5. The production process of a high-strength bonding alloy wire according to claim 4, characterized in that, The ethanol solution has a mass fraction of 85-90%; the yttrium nitrate solution has a mass fraction of 4-6%; the ultrasonic power for ultrasonic treatment is 450-550W, and the ultrasonic treatment lasts for 2 hours.

6. The production process of a high-strength bonding alloy wire according to claim 1, characterized in that, The sintering temperature of the blend is 245~255℃.

7. The production process of a high-strength bonding alloy wire according to claim 1, characterized in that, The specific method for the thermal adjustment improvement process is as follows: First, heat the material to 580-600℃ at a rate of 10-15℃ / min and hold for 15-20 minutes. Then, cool it to 480-490℃ at a rate of 5-10℃ / min and hold for 20 minutes. Next, cool it to 300-320℃ at a rate of 8-12℃ / min and hold for 30-40 minutes. Finally, cool it to room temperature at a rate of 3-5℃ / min.

8. A high-strength bonding wire, produced by the manufacturing process of a high-strength bonding wire as described in any one of claims 1 to 7.

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