High-strength titanium alloy key for mobile phone and preparation process of high-strength titanium alloy key

Abstract

The invention relates to the technical field of mobile phone keys, in particular to a high-strength mobile phone titanium alloy key and a preparation process thereof.The preparation process comprises the following steps of raw material preparation, alloy smelting, refining and degassing, precise forming, laser texturing treatment, ion implantation strengthening, anodic oxidation and micro-arc oxidation composite treatment, heat treatment and stress release. Carrying out surface lubrication and antibacterial treatment, and carrying out quality inspection and performance test; the high-strength mobile phone titanium alloy key and the preparation process thereof have the beneficial effects that the strength and wear resistance of the titanium alloy key are remarkably improved through reasonable alloy element proportioning and addition of nano materials such as the carbon nano tubes, so that the titanium alloy key can resist friction and wear in daily use, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the field of mobile phone keys, and in particular to a high-strength mobile phone titanium alloy key and a preparation process thereof. Background Art

[0002] With the rapid development of mobile communication technology, smartphones have become an indispensable part of people's daily lives. As an important interface for human-computer interaction, the performance and quality of mobile phone buttons are directly related to the user experience and satisfaction. Traditional mobile phone buttons are mostly made of materials such as plastic, stainless steel or ordinary alloys, which have certain limitations in terms of strength, wear resistance, corrosion resistance and touch. Especially in the high-end mobile phone market, users have higher requirements for the material, feel and durability of buttons.

[0003] Titanium alloy is a lightweight, high-strength, corrosion-resistant metal material. It has been widely used in aerospace, medical equipment and other fields due to its excellent physical and chemical properties. However, the application of titanium alloy in the field of mobile phone keys faces many challenges. On the one hand, titanium alloy is difficult to process and has high cost; on the other hand, how to improve the wear resistance, touch and hygiene performance of titanium alloy keys while ensuring strength is also an urgent problem to be solved. Summary of the invention

[0004] The purpose of the present invention is to provide a high-strength mobile phone titanium alloy key and a preparation process thereof to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a high-strength mobile phone titanium alloy key, wherein the raw materials of the high-strength mobile phone titanium alloy key include, by mass percentage: a titanium alloy body (94.0%-96.5%), aluminum (Al, 1.5%-3.5%), vanadium (V, 0.5%-1.2%), molybdenum (Mo, 0.3%-0.9%), niobium (Nb, 0.02%-0.08%), zirconium (Zr, 0.02%-0.08%), trace rare earth elements lanthanum (La, 0.002%-0.008%) and carbon nanotubes (CNTs, 0.05%-0.2%), which improve the strength and wear resistance of the titanium alloy and maintain good toughness and conductivity.

[0006] A preparation process for a high-strength titanium alloy key for a mobile phone, the preparation process comprising the following steps: a) raw material preparation: preparing raw materials according to the raw material composition, and ensuring that the purity of the raw materials is higher than 99.7wt%; the carbon nanotubes in the raw materials need to be surface modified to improve their bonding strength with the titanium alloy matrix;

[0007] b) Alloy smelting: carried out in a vacuum induction melting furnace, the vacuum degree in the furnace chamber is evacuated to below 1×10^-5Pa, and then filled with high-purity argon as a protective atmosphere, the melting temperature is 2600-3000℃, and the melting time is 5-7 minutes;

[0008] c) Refining and degassing: magnesium-aluminum alloy is used as a refining agent, the refining time is 3-5 minutes, followed by at least three degassing operations, each degassing time is 1.5-2.5 minutes. Preferably, the smelting process also includes at least four flipping operations, and the smelting state is maintained for 2-3 minutes after each flipping to achieve sufficient mixing and homogenization of the alloy liquid.

[0009] Preferably, the method further comprises the following steps:

[0010] d) Precision molding: Seven-axis CNC machining technology is used to process the smelted and refined titanium alloy material into the shape of a key. The machining accuracy is controlled within ±0.003mm and the surface roughness Ra≤0.1μm.

[0011] Preferably, the method further comprises the following steps:

[0012] e) Laser texturing: The surface of the titanium alloy key is laser textured after forming. The laser power is 30-40W, the scanning speed is 1500-2000mm / s, and the texture depth is controlled within the range of 0.07-0.15mm to enhance the touch and visual effect of the key.

[0013] Preferably, the method further comprises the following steps:

[0014] f) Ion implantation strengthening: Nitrogen (N) ion implantation technology is used to strengthen the titanium alloy key surface, with an ion energy of 70-90keV and an implantation dose of 3×1017ions / cm 2 , to improve the hardness and wear resistance of the key surface.

[0015] Preferably, the method further comprises the following steps:

[0016] g) Composite treatment of anodizing and micro-arc oxidation: The key surface is anodized to form a dense aluminum oxide protective film, followed by micro-arc oxidation to enhance the thickness and density of the protective film; the anodizing voltage is 30-40V, and the oxidation time is 60-120 minutes; the micro-arc oxidation voltage is 300-400V, and the treatment time is 10-20 minutes.

[0017] Preferably, the method further comprises the following steps:

[0018] h) Heat treatment and stress release: The titanium alloy keys after anodizing and micro-arc oxidation composite treatment are heated to 550-650°C, kept warm for 4-6 hours, and then naturally cooled to room temperature to eliminate internal stress and improve the stability and service life of the keys.

[0019] Preferably, the method further comprises the following steps:

[0020] i) Surface lubrication and antibacterial treatment: The surface of the titanium alloy key after heat treatment is lubricated with a fluorine-containing lubricant for 8-12 minutes; then an antibacterial treatment is performed with a silver ion antibacterial agent for 5-10 minutes to improve the hygienic performance of the key.

[0021] Preferably, the method further comprises the following steps:

[0022] j) Quality inspection and performance testing: The final high-strength mobile phone titanium alloy buttons are subjected to quality inspection and performance testing, including wear resistance testing: wear loss ≤ 0.003mg / cm 2 , corrosion resistance test: no corrosion in salt spray test for 96 hours, strength test: tensile strength ≥1000MPa, yield strength ≥800MPa, touch test: key pressing force ≤1.0N and antibacterial performance test: killing rate of Escherichia coli and Staphylococcus aureus ≥99% to ensure that the product meets the design requirements and usage standards.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The high-strength mobile phone titanium alloy keypad and its preparation process proposed in the present invention significantly improve the strength and wear resistance of the titanium alloy keypad through a reasonable alloy element ratio and the addition of nanomaterials such as carbon nanotubes, so that the keypad can withstand friction and wear in daily use and extend its service life.

[0025] Laser texturing treatment creates a delicate texture on the titanium alloy key surface, enhancing the touch and visual effects and improving the user experience. At the same time, ion implantation treatment further improves the hardness and wear resistance of the key surface, making it more durable.

[0026] Through the composite treatment of anodizing and micro-arc oxidation, a dense protective film is formed on the surface of the titanium alloy key, which effectively improves its corrosion resistance and anti-pollution ability. In addition, the antibacterial treatment further improves the hygiene performance of the key and reduces the risk of bacterial growth.

[0027] Through reasonable alloy element ratio and heat treatment process, it is ensured that titanium alloy keys have good toughness and conductivity while maintaining high strength and wear resistance, meeting the comprehensive requirements of mobile phone keys for material properties.

[0028] The use of advanced seven-axis linkage CNC processing technology and optimized preparation technology has improved the processing accuracy and production efficiency of titanium alloy buttons, reduced production costs, and made them more suitable for large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit 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.

[0031] For example, see Figure 1 The present invention provides a technical solution: a preparation process of a high-strength titanium alloy key for a mobile phone, the preparation process comprising the following steps:

[0032] Raw materials: titanium alloy body (95.0%), aluminum (2.5%), vanadium (0.8%), molybdenum (0.5%), niobium (0.05%), zirconium (0.05%), trace rare earth element lanthanum (0.02%) and carbon nanotubes (0.1%). The carbon nanotubes are surface-modified and modified with silane coupling agents to improve their bonding strength with the titanium alloy matrix.

[0033] Alloy smelting: It is carried out in a vacuum induction melting furnace, and the vacuum degree in the furnace chamber is evacuated to 5×10^-6Pa. High-purity argon gas is filled as a protective atmosphere, and the smelting temperature is 2800℃. The smelting time is 6 minutes, during which 5 flipping operations are performed, and the smelting state is maintained for 2.5 minutes after each flip. Refining and degassing: Magnesium-aluminum alloy is used as a refining agent, and the refining time is 4 minutes. Four degassing operations are performed, and the degassing time is 2 minutes each time.

[0034] Subsequent processing: Precision molding: Using seven-axis linkage CNC processing technology, the processing accuracy is controlled at ±0.003mm, and the surface roughness Ra=0.08μm. Laser texturing: The laser power is 35W, the scanning speed is 1800mm / s, and the texture depth is 0.1mm.

[0035] Ion implantation enhancement: nitrogen ion energy is 80keV, implantation dose is 5×10^17ions / cm 2. Composite treatment of anodic oxidation and micro-arc oxidation: the anodic oxidation voltage is 35V, the oxidation time is 90 minutes; the micro-arc oxidation voltage is 350V, and the treatment time is 15 minutes.

[0036] Heat treatment and stress release: Heat to 600℃ and keep warm for 5 hours.

[0037] Surface lubrication and antibacterial treatment: fluorine-containing lubricant is used, and the lubrication treatment time is 10 minutes; the silver ion antibacterial agent treatment time is 7 minutes.

[0038] Quality inspection and performance testing: Wear resistance test: Wear loss = 0.002mg / cm 2 . Corrosion resistance test: No corrosion after 96 hours of salt spray test. Strength test: Tensile strength = 1050MPa, yield strength = 850MPa. Touch test: Key press force = 0.9N.

[0039] Antibacterial performance test: Killing rate of Escherichia coli and Staphylococcus aureus = 99.9%.

[0040] Embodiment 2, based on embodiment 1, proposes the following solution:

[0041] The raw material composition is adjusted as follows: titanium alloy main body (94.5%), aluminum (3.0%), vanadium (1.0%), molybdenum (0.3%), and the remaining components are the same as those in Example 1.

[0042] The melting temperature was adjusted to 2700°C and the melting time was adjusted to 5.5 minutes.

[0043] The number of refining and degassing operations was adjusted to 3 times, and the degassing time was adjusted to 2.2 minutes each time. The scanning speed of the laser texturing treatment was adjusted to 1600 mm / s, and the texture depth was adjusted to 0.09 mm. The remaining steps and parameters were the same as those in Example 1.

[0044] Embodiment 3, based on embodiment 1, proposes the following solution:

[0045] The raw material composition is adjusted to: titanium alloy main body (96.0%), aluminum (2.0%), molybdenum (0.7%), niobium (0.08%), and the remaining components are the same as those in Example 1, but vanadium is not included.

[0046] The melting temperature was adjusted to 2900°C and the melting time was adjusted to 6.5 minutes.

[0047] The number of refining and degassing operations was adjusted to 4 times, and the degassing time was adjusted to 1.8 minutes each time. The energy of ion implantation was adjusted to 75keV, and the implantation dose was adjusted to 4×10^17ions / cm 2 .

[0048] Anodizing and micro-arc oxidation composite treatment: The anodizing time was adjusted to 75 minutes, and the micro-arc oxidation treatment time was adjusted to 18 minutes.

[0049] The remaining steps and parameters are the same as those in the first embodiment.

[0050] Embodiment 4, based on embodiment 3, proposes the following solution:

[0051] The raw material composition is adjusted to: titanium alloy main body (94.8%), aluminum (2.8%), vanadium (0.6%), molybdenum (0.4%), niobium (0.04%), zirconium (0.06%), and the remaining components are the same as in Example 1. The smelting temperature is adjusted to 2750° C., and the smelting time is adjusted to 6 minutes.

[0052] The number of refining and degassing operations was 4 times, and the degassing time was adjusted to 2 minutes each time.

[0053] For laser texturing, the laser power was adjusted to 32 W, the scanning speed was adjusted to 1700 mm / s, and the texture depth was adjusted to 0.12 mm.

[0054] Anodic oxidation and micro-arc oxidation composite treatment: The anodic oxidation voltage was adjusted to 38V, and the oxidation time was adjusted to 105 minutes; the micro-arc oxidation voltage was adjusted to 370V, and the treatment time was adjusted to 12 minutes. The heat treatment and stress release heating temperature was adjusted to 580°C, and the holding time was adjusted to 4.5 hours. The remaining steps and parameters were the same as those in Example 1.

[0055] The comparison data parameter table of Examples 1 to 4 and the prior art is as follows:

[0056]

[0057] "N / A" indicates that the parameter has no direct correlation with the prior art in this embodiment. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-strength titanium alloy key for a mobile phone, characterized in that: The raw materials of the high-strength mobile phone titanium alloy keypad include, by mass percentage: a titanium alloy body (94.0%-96.5%), aluminum (Al, 1.5%-3.5%), vanadium (V, 0.5%-1.2%), molybdenum (Mo, 0.3%-0.9%), niobium (Nb, 0.02%-0.08%), zirconium (Zr, 0.02%-0.08%), trace rare earth element lanthanum (La, 0.002%-0.008%) and carbon nanotubes (CNTs, 0.05%-0.2%), which improve the strength and wear resistance of the titanium alloy and maintain good toughness and conductivity.

2. The process for preparing a high-strength titanium alloy key for a mobile phone according to claim 1, characterized in that: The preparation process comprises the following steps: a) Raw material preparation: Prepare the raw materials according to the raw material composition, and ensure that the purity of the raw materials is higher than 99.7wt%; the carbon nanotubes in the raw materials need to be surface modified to improve their bonding strength with the titanium alloy matrix; b) Alloy smelting: carried out in a vacuum induction melting furnace, the vacuum degree in the furnace chamber is evacuated to below 1×10^-5Pa, and then filled with high-purity argon as a protective atmosphere, the melting temperature is 2600-3000℃, and the melting time is 5-7 minutes; c) Refining and degassing: magnesium-aluminum alloy is used as a refining agent, the refining time is 3-5 minutes, and then at least three degassing operations are performed, each degassing time is 1.5-2.5 minutes.

3. The process for preparing a high-strength titanium alloy keypad for a mobile phone according to claim 2, characterized in that: The smelting process also includes at least four flipping operations, and the smelting state is maintained for 2-3 minutes after each flipping to achieve sufficient mixing and homogenization of the alloy liquid.

4. The process for preparing a high-strength titanium alloy keypad for a mobile phone according to claim 3, characterized in that: The following steps are also included: d) Precision molding: Seven-axis CNC machining technology is used to process the smelted and refined titanium alloy material into the shape of a key. The machining accuracy is controlled within ±0.003mm and the surface roughness Ra≤0.1μm.

5. The process for preparing a high-strength titanium alloy keypad for a mobile phone according to claim 4, characterized in that: The following steps are also included: e) Laser texturing: The surface of the titanium alloy key is laser textured after forming. The laser power is 30-40W, the scanning speed is 1500-2000mm / s, and the texture depth is controlled within the range of 0.07-0.15mm to enhance the touch and visual effect of the key.

6. The process for preparing a high-strength titanium alloy key for a mobile phone according to claim 5, characterized in that: The following steps are also included: f) Ion implantation strengthening: Nitrogen (N) ion implantation technology is used to strengthen the titanium alloy key surface, with an ion energy of 70-90keV and an implantation dose of 3×1017ions / cm 2 , to improve the hardness and wear resistance of the key surface.

7. The process for preparing a high-strength titanium alloy keypad for a mobile phone according to claim 6, characterized in that: The following steps are also included: g) Composite treatment of anodizing and micro-arc oxidation: The key surface is anodized to form a dense aluminum oxide protective film, followed by micro-arc oxidation to enhance the thickness and density of the protective film; the anodizing voltage is 30-40V, and the oxidation time is 60-120 minutes; the micro-arc oxidation voltage is 300-400V, and the treatment time is 10-20 minutes.

8. The process for preparing a high-strength titanium alloy keypad for a mobile phone according to claim 7, characterized in that: The following steps are also included: h) Heat treatment and stress release: The titanium alloy keys after anodizing and micro-arc oxidation composite treatment are heated to 550-650°C, kept warm for 4-6 hours, and then naturally cooled to room temperature to eliminate internal stress and improve the stability and service life of the keys.

9. The process for preparing a high-strength titanium alloy keypad for a mobile phone according to claim 8, characterized in that: The following steps are also included: i) Surface lubrication and antibacterial treatment: The surface of the titanium alloy key after heat treatment is lubricated with a fluorine-containing lubricant for 8-12 minutes; then an antibacterial treatment is performed with a silver ion antibacterial agent for 5-10 minutes to improve the hygienic performance of the key.

10. The process for preparing a high-strength titanium alloy keypad for a mobile phone according to claim 9, characterized in that: The following steps are also included: j) Quality inspection and performance testing: The final high-strength mobile phone titanium alloy buttons are subjected to quality inspection and performance testing, including wear resistance testing: wear loss ≤ 0.003mg / cm 2 , corrosion resistance test: no corrosion in salt spray test for 96 hours, strength test: tensile strength ≥1000MPa, yield strength ≥800MPa, touch test: key pressing force ≤1.0N and antibacterial performance test: killing rate of Escherichia coli and Staphylococcus aureus ≥99% to ensure that the product meets the design requirements and usage standards.

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