Lightweight corrosion-resistant electric soldering bit and preparation method thereof

Abstract

The invention relates to the technical field of electric soldering iron, and discloses a light-weight corrosion-resistant electric soldering bit based on a carbon fiber reinforced phenolic resin carbonized composite material and a preparation method of the light-weight corrosion-resistant electric soldering bit. The light-weight corrosion-resistant electric soldering bit comprises a base body and a surface modification layer. The matrix is prepared from a carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material matrix has a gradient heat conduction structure; the preparation method of the base body comprises the steps that carbon fibers are woven into a carbon fiber woven body according to the shape of an electric soldering bit; dipping the carbon fiber woven body in a phenolic resin solution, carrying out vacuum-assisted dipping, and then carrying out gradient heating curing to obtain a material blank; and in an inert atmosphere, carrying out gradient sintering on the material blank, and cooling to obtain the matrix. According to the gradient heat conduction structure, efficient heat transfer is achieved, and the temperature rising speed and the temperature stability of the electric soldering bit are improved. The surface modification layer further optimizes the wear resistance and the oxidation resistance of the electric soldering bit, and the service life can be remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the field of soldering iron technology, and more specifically, to a lightweight, corrosion-resistant soldering iron tip based on a carbon fiber reinforced phenolic resin carbonized composite material and its preparation method. Background Technology

[0002] A soldering iron is an essential tool for electronics manufacturing and appliance repair, primarily used for soldering components and wires. The soldering tip is an accessory for the soldering iron, and its performance directly affects the quality and efficiency of the soldering process.

[0003] Currently, most mainstream soldering iron tips are made of metallic materials such as copper, iron-nickel alloys, or surface-plated alloys. However, traditional materials have drawbacks such as heavy weight, poor corrosion resistance, and thermal degradation, affecting soldering efficiency and quality. To overcome the shortcomings of traditional materials, existing technologies also use non-metallic materials such as ceramics and graphite to prepare soldering iron tips. However, non-metallic materials generally suffer from high brittleness, poor resistance to mechanical impact, difficulty in processing and shaping, and high cost, making them difficult to widely apply in practical industrial scenarios.

[0004] Therefore, it is of great significance to develop a new type of soldering iron tip material that is lightweight, has excellent mechanical strength and corrosion resistance. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problems of traditional metal soldering iron tip materials, such as heavy weight, easy corrosion, and rapid thermal performance decay, as well as the problems of non-metallic soldering iron tip materials, such as high brittleness, difficulty in processing, and high cost. Therefore, this invention provides a lightweight, corrosion-resistant soldering iron tip based on carbon fiber reinforced phenolic resin carbonized composite material and its preparation method.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a lightweight and corrosion-resistant soldering iron tip, comprising a substrate and a surface modification layer; The matrix is ​​prepared from a carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material matrix has a gradient thermal conductivity structure. The method for preparing the matrix is ​​as follows: Step 1: According to the shape of the soldering iron tip, the carbon fiber is woven into a carbon fiber braid; Step 2: Impregnate the carbon fiber braid in a phenolic resin solution using vacuum-assisted impregnation, followed by gradient temperature curing to obtain a blank; Step 3: Under an inert atmosphere, the blank is gradient sintered and cooled to obtain the matrix.

[0007] Furthermore, in step 1, the carbon fiber volume ratio of the carbon fiber braid is 40-60%.

[0008] Furthermore, in step 2, the impregnation process applies a pressure of 0.5~2.0 MPa.

[0009] Furthermore, in step 2, the gradient temperature curing refers to: First stage: Increase the temperature to 60-80°C at a rate of 0.5-1.0°C / min, and hold for 60-120 minutes; Second stage: Increase the temperature to 100-120°C at a rate of 0.3-0.5°C / min, and hold for 120-180 min; The third stage: Increase the temperature to 160-180°C at a rate of 0.2-0.3°C / min, and hold for 180-240 minutes.

[0010] Furthermore, in step 2, pressure is applied during the gradient temperature curing process: First stage: Apply pressure of 0.1~0.5MPa; Second stage: Apply pressure of 1.0~2.0 MPa; Third stage: Apply pressure of 1.5~2.5MPa.

[0011] Furthermore, in step 3, the gradient sintering refers to: First stage: Increase the temperature to 300-400°C at a rate of 1.0-3.0°C / min and hold for 1-2 hours; Second stage: Increase the temperature to 600-800°C at a rate of 2.0-5.0°C / min and hold for 2-4 hours; The third stage: Increase the temperature to 1000-1200°C at a rate of 3.0-8.0°C / min and hold for 4-6 hours.

[0012] Furthermore, in step 3, during the gradient sintering process, the pressure is controlled at 0.1~0.2MPa and the inert gas flow rate is 100~200mL / min.

[0013] Secondly, the present invention provides a method for preparing the lightweight and corrosion-resistant soldering iron tip, comprising the following steps: S1, Preparation of the matrix; S2, a micron-scale SiC antioxidant layer is formed on the substrate surface by chemical vapor deposition to obtain the soldering iron tip.

[0014] Furthermore, the specific steps of S2 are as follows: Using methyltrichlorosilane as the silicon and carbon source, and hydrogen as the carrier gas and reducing agent, a SiC antioxidant layer is formed on the substrate surface. During the process, the temperature was controlled at 1000~1100°C, the pressure was controlled at 4.5~5.0 kPa, the molar ratio of hydrogen to methyltrichlorosilane was (9~10):1, and the deposition time was 4~6 h.

[0015] Furthermore, the soldering iron tip obtained in S2 is subjected to plasma treatment by introducing a mixture of tetrafluoromethane and hydrogen gas with a volume ratio of 4:1, a treatment power of 80~100W, a time of 20~30min, and a control pressure of 45~50Pa.

[0016] In summary, the present invention has the following beneficial effects: 1. The present invention prepares a matrix by combining carbon fiber braid with phenolic resin and then performing gradient sintering. By combining the properties of carbon fiber and resin with a gradient thermal conductivity design, the heat distribution of the soldering iron tip is more uniform during operation, which effectively improves the soldering efficiency.

[0017] 2. In the present invention, the carbon fiber volume ratio in the matrix is ​​controlled at 40-60%. While ensuring the material is lightweight, the internal stress is reduced and the mechanical properties of the soldering iron tip are improved through gradient temperature curing and gradient sintering processes.

[0018] 3. The surface modification layer in this invention adopts a combination of chemical vapor deposition of SiC anti-oxidation layer and plasma treatment, which significantly improves the high-temperature oxidation resistance of soldering iron tip; the fluorine-containing groups introduced by plasma treatment further optimize the surface corrosion resistance. Detailed Implementation

[0019] The technical solutions and effects of the present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely for explaining the invention and are not intended to limit the invention.

[0020] Example 1 This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which includes a substrate and a surface modification layer; The matrix is ​​prepared from carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material matrix has a gradient thermal conductivity structure.

[0021] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows: Step 1: Based on the shape of the soldering iron tip, a three-dimensional orthogonal braid of T700 carbon fiber is used, in which the carbon fiber accounts for 40% of the volume. Step 2: The carbon fiber braid is impregnated in a phenolic resin solution (65% solid content) by vacuum-assisted impregnation. A pressure of 0.5 MPa is applied during the impregnation process, followed by gradient temperature curing to obtain a blank. Gradient temperature curing refers to: First stage: Heat to 60°C at a rate of 0.5°C / min, hold for 60 min, and apply a pressure of 0.1 MPa; Second stage: Heat to 100°C at a rate of 0.3°C / min, hold for 120 min, and apply a pressure of 1.0 MPa; The third stage: the temperature is increased to 160°C at a rate of 0.2°C / min, held for 180min, and a pressure of 1.5MPa is applied. Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix; Gradient sintering refers to: First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour; Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours; Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours; During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min. Step 4: Using chemical vapor deposition, a SiC antioxidant layer is formed on the substrate surface with methyltrichlorosilane as the silicon and carbon source and hydrogen as the carrier gas and reducing agent. During the process, the temperature was controlled at 1000°C, the pressure was controlled at 4.5 kPa, the molar ratio of hydrogen to methyltrichlorosilane was 9:1, and the deposition time was 4 hours to obtain the soldering iron tip.

[0022] Example 2 This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which includes a substrate and a surface modification layer; The matrix is ​​prepared from carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material matrix has a gradient thermal conductivity structure.

[0023] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows: Step 1: Based on the shape of the soldering iron tip, a three-dimensional orthogonal braid of T700 carbon fiber is used, in which the carbon fiber accounts for 50% of the volume. Step 2: The carbon fiber braid is impregnated in a phenolic resin solution (65% solid content) by vacuum-assisted impregnation. A pressure of 0.5 MPa is applied during the impregnation process, followed by gradient temperature curing to obtain a blank. Gradient temperature curing refers to: First stage: Increase the temperature to 60°C at a rate of 0.5°C / min, hold for 60 min, and apply a pressure of 0.1~0.5MPa; Second stage: Heat to 100°C at a rate of 0.3°C / min, hold for 120 min, and apply a pressure of 1.0~2.0 MPa; The third stage: the temperature is increased to 160°C at a rate of 0.2°C / min, held for 180min, and a pressure of 1.5MPa is applied. Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix; Gradient sintering refers to: First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour; Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours; Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours; During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min. Step 4: Using chemical vapor deposition, a SiC antioxidant layer is formed on the substrate surface with methyltrichlorosilane as the silicon and carbon source and hydrogen as the carrier gas and reducing agent. During the process, the temperature was controlled at 1000°C, the pressure was controlled at 4.5 kPa, the molar ratio of hydrogen to methyltrichlorosilane was 9:1, and the deposition time was 4 hours to obtain the soldering iron tip.

[0024] Example 3 This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which includes a substrate and a surface modification layer; The matrix is ​​prepared from carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material matrix has a gradient thermal conductivity structure.

[0025] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows: Step 1: Based on the shape of the soldering iron tip, a three-dimensional orthogonal braid of T700 carbon fiber is used, in which the carbon fiber accounts for 60% of the volume. Step 2: The carbon fiber braid is impregnated in a phenolic resin solution (65% solid content) by vacuum-assisted impregnation. A pressure of 0.5 MPa is applied during the impregnation process, followed by gradient temperature curing to obtain a blank. Gradient temperature curing refers to: First stage: Increase the temperature to 60°C at a rate of 0.5°C / min, hold for 60 min, and apply a pressure of 0.1~0.5MPa; Second stage: Heat to 100°C at a rate of 0.3°C / min, hold for 120 min, and apply a pressure of 1.0~2.0 MPa; The third stage: the temperature is increased to 160°C at a rate of 0.2°C / min, held for 180min, and a pressure of 1.5MPa is applied. Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix; Gradient sintering refers to: First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour; Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours; Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours; During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min. Step 4: Using chemical vapor deposition, a SiC antioxidant layer is formed on the substrate surface with methyltrichlorosilane as the silicon and carbon source and hydrogen as the carrier gas and reducing agent. During the process, the temperature was controlled at 1000°C, the pressure was controlled at 4.5 kPa, the molar ratio of hydrogen to methyltrichlorosilane was 9:1, and the deposition time was 4 hours to obtain the soldering iron tip.

[0026] Example 4 This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which includes a substrate and a surface modification layer; The matrix is ​​prepared from carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material matrix has a gradient thermal conductivity structure.

[0027] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows: Step 1: Based on the shape of the soldering iron tip, a three-dimensional orthogonal braid of T700 carbon fiber is used, in which the carbon fiber accounts for 40% of the volume. Step 2: The carbon fiber braid is impregnated in a phenolic resin solution (65% solid content) by vacuum-assisted impregnation. A pressure of 1.5 MPa is applied during the impregnation process, followed by gradient temperature curing to obtain a blank. Gradient temperature curing refers to: First stage: Heat to 80°C at a rate of 1.0°C / min, hold for 120 min, and apply a pressure of 0.5 MPa; Second stage: Heat to 120°C at a rate of 0.5°C / min, hold for 180 min, and apply a pressure of 2.0 MPa; The third stage: the temperature is increased to 180°C at a rate of 0.3°C / min, held for 240 min, and a pressure of 2.5 MPa is applied. Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix; Gradient sintering refers to: First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour; Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours; Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours; During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min. Step 4: Using chemical vapor deposition, a SiC antioxidant layer is formed on the substrate surface with methyltrichlorosilane as the silicon and carbon source and hydrogen as the carrier gas and reducing agent. During the process, the temperature was controlled at 1000°C, the pressure was controlled at 4.5 kPa, the molar ratio of hydrogen to methyltrichlorosilane was 9:1, and the deposition time was 4 hours to obtain the soldering iron tip.

[0028] Example 5 This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which includes a substrate and a surface modification layer; The matrix is ​​prepared from carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material matrix has a gradient thermal conductivity structure.

[0029] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows: Step 1: Based on the shape of the soldering iron tip, a three-dimensional orthogonal braid of T700 carbon fiber is used, in which the carbon fiber accounts for 40% of the volume. Step 2: The carbon fiber braid is impregnated in a phenolic resin solution (65% solid content) by vacuum-assisted impregnation. A pressure of 0.5 MPa is applied during the impregnation process, followed by gradient temperature curing to obtain a blank. Gradient temperature curing refers to: First stage: Heat to 60°C at a rate of 0.5°C / min, hold for 60 min, and apply a pressure of 0.1 MPa; Second stage: Heat to 100°C at a rate of 0.3°C / min, hold for 120 min, and apply a pressure of 1.0 MPa; The third stage: the temperature is increased to 160°C at a rate of 0.2°C / min, held for 180min, and a pressure of 1.5MPa is applied. Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix; Gradient sintering refers to: First stage: Increase the temperature to 400°C at a rate of 3.0°C / min and hold for 2 hours; Second stage: Increase the temperature to 800°C at a rate of 5.0°C / min and hold for 4 hours; Third stage: Increase the temperature to 1200°C at a rate of 8.0°C / min and hold for 6 hours; During gradient sintering, the pressure was controlled at 0.2 MPa and the inert gas flow rate was 200 mL / min. Step 4: Using chemical vapor deposition, a SiC antioxidant layer is formed on the substrate surface with methyltrichlorosilane as the silicon and carbon source and hydrogen as the carrier gas and reducing agent. During the process, the temperature was controlled at 1000°C, the pressure was controlled at 4.5 kPa, the molar ratio of hydrogen to methyltrichlorosilane was 9:1, and the deposition time was 4 hours to obtain the soldering iron tip.

[0030] Example 6 This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which includes a substrate and a surface modification layer; The matrix is ​​prepared from carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material matrix has a gradient thermal conductivity structure.

[0031] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows: Step 1: Based on the shape of the soldering iron tip, a three-dimensional orthogonal braid of T700 carbon fiber is used, in which the carbon fiber accounts for 40% of the volume. Step 2: The carbon fiber braid is impregnated in a phenolic resin solution (65% solid content) by vacuum-assisted impregnation. A pressure of 0.5 MPa is applied during the impregnation process, followed by gradient temperature curing to obtain a blank. Gradient temperature curing refers to: First stage: Heat to 60°C at a rate of 0.5°C / min, hold for 60 min, and apply a pressure of 0.1 MPa; Second stage: Heat to 100°C at a rate of 0.3°C / min, hold for 120 min, and apply a pressure of 1.0 MPa; The third stage: the temperature is increased to 160°C at a rate of 0.2°C / min, held for 180min, and a pressure of 1.5MPa is applied. Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix; Gradient sintering refers to: First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour; Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours; Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours; During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min. Step 4: Using chemical vapor deposition, a SiC antioxidant layer is formed on the substrate surface with methyltrichlorosilane as the silicon and carbon source and hydrogen as the carrier gas and reducing agent. During the process, the temperature was controlled at 1100°C, the pressure was controlled at 5.0 kPa, the molar ratio of hydrogen to methyltrichlorosilane was 10:1, and the deposition time was 6 hours to obtain the soldering iron tip.

[0032] Example 7 This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which includes a substrate and a surface modification layer; The matrix is ​​prepared from carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material matrix has a gradient thermal conductivity structure.

[0033] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows: Step 1: Based on the shape of the soldering iron tip, a three-dimensional orthogonal braid of T700 carbon fiber is used, in which the carbon fiber accounts for 40% of the volume. Step 2: The carbon fiber braid is impregnated in a phenolic resin solution (65% solid content) by vacuum-assisted impregnation. A pressure of 0.5 MPa is applied during the impregnation process, followed by gradient temperature curing to obtain a blank. Gradient temperature curing refers to: First stage: Heat to 60°C at a rate of 0.5°C / min, hold for 60 min, and apply a pressure of 0.1 MPa; Second stage: Heat to 100°C at a rate of 0.3°C / min, hold for 120 min, and apply a pressure of 1.0 MPa; The third stage: the temperature is increased to 160°C at a rate of 0.2°C / min, held for 180min, and a pressure of 1.5MPa is applied. Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix; Gradient sintering refers to: First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour; Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours; Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours; During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min. Step 4: Using chemical vapor deposition, a SiC antioxidant layer is formed on the substrate surface with methyltrichlorosilane as the silicon and carbon source and hydrogen as the carrier gas and reducing agent. During the process, the temperature was controlled at 1000°C, the pressure was controlled at 4.5 kPa, the molar ratio of hydrogen to methyltrichlorosilane was 9:1, and the deposition time was 4 hours to obtain the soldering iron tip. The soldering iron tip is subjected to plasma treatment by introducing a mixture of tetrafluoromethane and hydrogen gas with a volume ratio of 4:1, a treatment power of 100W, a time of 30 minutes, and a controlled pressure of 50Pa.

[0034] Example 8 This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which is prepared in the same way as in Example 1, except that it undergoes two impregnation-curing cycles.

[0035] Comparative Example 1 This embodiment provides a soldering iron tip, which includes a base; The matrix is ​​prepared from carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material matrix has a gradient thermal conductivity structure.

[0036] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows: Step 1: Based on the shape of the soldering iron tip, a three-dimensional orthogonal braid of T700 carbon fiber is used, in which the carbon fiber accounts for 40% of the volume. Step 2: The carbon fiber braid is impregnated in a phenolic resin solution (65% solid content) by vacuum-assisted impregnation. A pressure of 0.5 MPa is applied during the impregnation process, followed by gradient temperature curing to obtain a blank. Gradient temperature curing refers to: First stage: Heat to 60°C at a rate of 0.5°C / min, hold for 60 min, and apply a pressure of 0.1 MPa; Second stage: Heat to 100°C at a rate of 0.3°C / min, hold for 120 min, and apply a pressure of 1.0 MPa; The third stage: the temperature is increased to 160°C at a rate of 0.2°C / min, held for 180min, and a pressure of 1.5MPa is applied. Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix; Gradient sintering refers to: First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour; Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours; Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours; During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min.

[0037] Comparative Example 2 This embodiment provides a soldering iron tip, which includes a substrate and a surface modification layer; The matrix is ​​prepared from carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material matrix has a gradient thermal conductivity structure.

[0038] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows: Step 1: Based on the shape of the soldering iron tip, a three-dimensional orthogonal braid of T700 carbon fiber is used, in which the carbon fiber accounts for 40% of the volume. Step 2: Impregnate the carbon fiber braid in a phenolic resin solution (65% solid content) using vacuum-assisted impregnation. Apply a pressure of 0.5 MPa during the impregnation process, and then heat and cure to obtain a blank. Temperature curing refers to: The temperature was increased to 160°C at a rate of 0.5°C / min, held for 360 min, and a pressure of 1.0 MPa was applied. Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix; Gradient sintering refers to: First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour; Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours; Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours; During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min. Step 4: Using chemical vapor deposition, a SiC antioxidant layer is formed on the substrate surface with methyltrichlorosilane as the silicon and carbon source and hydrogen as the carrier gas and reducing agent. During the process, the temperature was controlled at 1000°C, the pressure was controlled at 4.5 kPa, the molar ratio of hydrogen to methyltrichlorosilane was 9:1, and the deposition time was 4 hours to obtain the soldering iron tip.

[0039] Comparative Example 3 This embodiment provides a soldering iron tip, which includes a substrate and a surface modification layer; The matrix is ​​prepared from carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material matrix has a gradient thermal conductivity structure.

[0040] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows: Step 1: Based on the shape of the soldering iron tip, a three-dimensional orthogonal braid of T700 carbon fiber is used, in which the carbon fiber accounts for 40% of the volume. Step 2: The carbon fiber braid is impregnated in a phenolic resin solution (65% solid content) by vacuum-assisted impregnation. A pressure of 0.5 MPa is applied during the impregnation process, followed by gradient temperature curing to obtain a blank. Gradient temperature curing refers to: First stage: Heat to 60°C at a rate of 0.5°C / min, hold for 60 min, and apply a pressure of 0.1 MPa; Second stage: Heat to 100°C at a rate of 0.3°C / min, hold for 120 min, and apply a pressure of 1.0 MPa; The third stage: the temperature is increased to 160°C at a rate of 0.2°C / min, held for 180 min, and a pressure of 1.5 MPa is applied. Step 3: Sinter the blank under an inert atmosphere (argon) and cool it to obtain the matrix; Sintering refers to: The temperature was increased to 1000°C at a rate of 1.0°C / min and held for 7 hours. During the sintering process, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min; Step 4: Using chemical vapor deposition, a SiC antioxidant layer is formed on the substrate surface with methyltrichlorosilane as the silicon and carbon source, and hydrogen as the carrier gas and reducing agent. During the process, the temperature was controlled at 1000°C, the pressure was controlled at 4.5 kPa, the molar ratio of hydrogen to methyltrichlorosilane was 9:1, and the deposition time was 4 hours to obtain the soldering iron tip.

[0041] The soldering iron tips prepared in Examples 1-8 and Comparative Examples 1-3, as well as the traditional copper soldering iron tips, were tested to measure their weight, bending strength, acid resistance, and thermal response performance.

[0042] Weight test method: Weigh using an electronic balance at room temperature.

[0043] Bending strength test method: Refer to the method in GB / T 1449-2005.

[0044] Acid resistance test method: Prepare a 10% (w / w) dilute sulfuric acid solution to simulate a strong acid environment; place the sample in a 120°C drying oven for 2 hours, remove it and cool it to room temperature in a desiccator, and weigh its initial mass using an analytical balance; completely immerse the sample in a sealed glass container containing sufficient 10% dilute sulfuric acid solution, and place the container in an 80°C constant temperature water bath to accelerate the corrosion process; after soaking for 168 hours (7 days), remove the sample, ultrasonically clean it with deionized water for 5 minutes to remove surface adhering substances, dry it at 120°C for 2 hours, cool it and weigh it; calculate the mass loss rate.

[0045] Thermal response performance test method: Securely mount the soldering iron tip to the heating element and record the time required for the tip temperature to rise from room temperature to 300°C.

[0046] The results are shown in Table 1: Table 1 Weight (g) Bending strength (MPa) Mass loss rate (%) Time (s) Example 1 16.2 285 0.12 7.2 Example 2 19.8 352 0.15 6.8 Example 3 23.1 398 0.18 6.5 Example 4 16.3 310 0.10 7.5 Example 5 16.3 266 0.16 6.2 Example 6 16.2 290 0.08 7.8 Example 7 16.0 287 0.01 7.3 Example 8 16.1 322 0.05 7.0 Comparative Example 1 16.0 270 3.50 7.0 Comparative Example 2 17.5 180 0.98 8.5 Comparative Example 3 16.1 156 0.60 9.3 Conventional copper bit 80.1 220 Severe corrosion 15.5 As shown in Table 1, the lightweight and corrosion-resistant soldering iron tip prepared by this invention exhibits significant advantages in terms of weight, bending strength, acid resistance, and thermal response performance.

[0047] Compared with traditional copper soldering iron tips, the soldering iron tips of each embodiment are significantly lighter, weighing only about 20-25% of traditional copper soldering iron tips. This effectively achieves weight reduction, making it easier for operators to use for extended periods and reducing hand fatigue.

[0048] In terms of bending strength, most embodiments exceed 280 MPa, with embodiment 3 reaching 398 MPa, which is significantly better than the 220 MPa of traditional copper soldering iron tips, indicating that its structural stability and durability have been significantly improved.

[0049] In the acid resistance test, the mass loss rate of the examples was generally less than 0.2%, with Example 7 at only 0.01%, while Comparative Example 1, which did not form a SiC antioxidant layer, had a mass loss rate as high as 3.50%, and the traditional copper soldering iron tip was severely corroded. This shows that the SiC antioxidant layer formed by chemical vapor deposition and subsequent plasma treatment processes of the present invention can effectively improve the acid corrosion resistance of the soldering iron tip.

[0050] In terms of thermal response performance, the time required for each embodiment to rise from room temperature to 300°C is less than 7.8s, with embodiment 5 requiring only 6.2s, which is far lower than the 15.5s of the traditional copper soldering iron tip. This demonstrates good thermal conductivity and rapid heating capability, which helps to improve the efficiency of soldering operations.

[0051] Meanwhile, based on the comparison of various embodiments and comparative examples, it can be seen that gradient temperature curing and gradient sintering processes are very important for improving the bending strength and thermal response performance of soldering iron tips, and can significantly improve overall performance.

[0052] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A lightweight, corrosion-resistant soldering iron tip, characterized in that, Includes the substrate and the surface modification layer; The matrix is ​​prepared from a carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material matrix has a gradient thermal conductivity structure. The method for preparing the matrix is ​​as follows: Step 1: According to the shape of the soldering iron tip, the carbon fiber is woven into a carbon fiber braid; Step 2: Impregnate the carbon fiber braid in a phenolic resin solution using vacuum-assisted impregnation, followed by gradient temperature curing to obtain a blank; Step 3: Under an inert atmosphere, the blank is gradient sintered and cooled to obtain the matrix.

2. The lightweight corrosion-resistant soldering iron tip according to claim 1, characterized in that, In step 1, the carbon fiber volume ratio of the carbon fiber braid is 40-60%.

3. The lightweight corrosion-resistant soldering iron tip according to claim 1, characterized in that, In step 2, the impregnation process applies a pressure of 0.5 to 2.0 MPa.

4. The lightweight corrosion-resistant soldering iron tip according to claim 1, characterized in that, In step 2, the gradient temperature curing refers to: First stage: Increase the temperature to 60-80°C at a rate of 0.5-1.0°C / min, and hold for 60-120 minutes; Second stage: Increase the temperature to 100-120°C at a rate of 0.3-0.5°C / min, and hold for 120-180 min; The third stage: Increase the temperature to 160-180°C at a rate of 0.2-0.3°C / min, and hold for 180-240 minutes.

5. The lightweight corrosion-resistant soldering iron tip according to claim 4, characterized in that, In step 2, pressure is applied during the gradient temperature curing process: First stage: Apply pressure of 0.1~0.5MPa; Second stage: Apply pressure of 1.0~2.0 MPa; Third stage: Apply pressure of 1.5~2.5MPa.

6. The lightweight corrosion-resistant soldering iron tip according to claim 1, characterized in that, In step 3, the gradient sintering refers to: First stage: Increase the temperature to 300-400°C at a rate of 1.0-3.0°C / min and hold for 1-2 hours; Second stage: Increase the temperature to 600-800°C at a rate of 2.0-5.0°C / min and hold for 2-4 hours; The third stage: heat to 1000-1200°C at a rate of 3.0-8.0°C / min and hold for 4-6 hours.

7. The lightweight corrosion-resistant soldering iron tip according to claim 6, characterized in that, In step 3, during the gradient sintering process, the pressure is controlled at 0.1~0.2MPa and the inert gas flow rate is 100~200mL / min.

8. The method for preparing the lightweight corrosion-resistant soldering iron tip according to any one of claims 1-7, characterized in that, Includes the following steps: S1, Preparation of the matrix; S2, a micron-scale SiC antioxidant layer is formed on the substrate surface by chemical vapor deposition to obtain the soldering iron tip.

9. The preparation method according to claim 8, characterized in that, The specific steps of S2 are as follows: Using methyltrichlorosilane as the silicon and carbon source, and hydrogen as the carrier gas and reducing agent, a SiC antioxidant layer is formed on the substrate surface. During the process, the temperature was controlled at 1000~1100°C, the pressure was controlled at 4.5~5.0 kPa, the molar ratio of hydrogen to methyltrichlorosilane was (9~10):1, and the deposition time was 4~6 h.

10. The preparation method according to claim 9, characterized in that, The soldering iron tip obtained in S2 is subjected to plasma treatment by introducing a mixture of tetrafluoromethane and hydrogen gas with a volume ratio of 4:1, a treatment power of 80~100W, a time of 20~30min, and a control pressure of 45~50Pa.