Lightweight corrosion-resistant electric soldering iron tip and preparation method thereof

Abstract

The present application relates to the technical field of electric soldering iron, and discloses a light-weight corrosion-resistant electric soldering iron tip based on carbon fiber reinforced phenolic resin carbonized composite material and a preparation method thereof.The light-weight corrosion-resistant electric soldering iron tip comprises a base and a surface modification layer; the base is prepared from carbon fiber reinforced phenolic resin carbonized composite material, and the base has a gradient heat conduction structure; the base is prepared by weaving carbon fibers into a carbon fiber woven body according to the shape of the electric soldering iron tip; the carbon fiber woven body is immersed in a phenolic resin solution, vacuum-assisted impregnation is performed, and then gradient temperature curing is performed to obtain a green body; the green body is gradient sintered in an inert atmosphere, and then cooled to obtain the base.The gradient heat conduction structure of the present application realizes efficient heat transfer, and improves the heating speed and temperature stability of the electric soldering iron tip.The surface modification layer further optimizes the wear resistance and oxidation resistance of the electric soldering iron tip, and can significantly prolong the service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric soldering iron, more particularly, it relates to a light-weight corrosion-resistant electric soldering iron tip based on carbon fiber reinforced phenolic resin carbonized composite material and a preparation method thereof. BACKGROUND

[0002] Electric soldering iron is an essential tool for electronic manufacturing and electrical appliance maintenance, and is mainly used for welding components and wires. The performance of the soldering iron tip, which is a matching product of the electric soldering iron, directly affects the welding quality and efficiency.

[0003] At present, the mainstream electric soldering iron tip is made of copper, iron-nickel alloy or surface plated alloy metal materials. However, the traditional materials have the disadvantages of heavy weight, poor corrosion resistance and thermal performance decay, which affect the welding efficiency and quality. In order to overcome the defects of traditional materials, ceramic and graphite non-metallic materials are also used to prepare the soldering iron tip in the prior art. However, the non-metallic materials generally have the problems of large brittleness, poor mechanical impact resistance, difficult processing and high cost, which are difficult to be widely applied in actual industrial scenes.

[0004] Therefore, it is of great significance to develop a new type of electric soldering iron tip material with light weight, excellent mechanical strength and corrosion resistance. SUMMARY

[0005] The present application aims to solve the technical problems of heavy weight, easy corrosion and fast thermal performance decay of traditional metal electric soldering iron tip materials, and the problems of large brittleness, difficult processing and high cost of non-metallic electric soldering iron tip materials. Therefore, the present application provides a light-weight corrosion-resistant electric soldering iron tip based on carbon fiber reinforced phenolic resin carbonized composite material and a preparation method thereof.

[0006] In order to achieve the above-mentioned application purposes, the present application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a light-weight corrosion-resistant electric soldering iron tip, which comprises a base body and a surface modification layer.

[0008] The base body is prepared from carbon fiber reinforced phenolic resin carbonized composite material, and the carbon fiber reinforced phenolic resin carbonized composite material base body has a gradient heat conduction structure.

[0009] The preparation method of the base body is as follows:

[0010] Step 1: According to the shape of the electric soldering iron tip, carbon fibers are woven into a carbon fiber woven body.

[0011] Step 2: The carbon fiber woven body is immersed in a phenolic resin solution, vacuum assisted impregnation is performed, and then gradient temperature curing is performed to obtain a green body.

[0012] Step 3, gradient sintering the green body under inert atmosphere, and cooling to obtain the matrix.

[0013] Further, in step 1, the carbon fiber volume fraction of the carbon fiber woven body is 40-60%.

[0014] Further, in step 2, the impregnation process applies a pressure of 0.5-2.0 MPa.

[0015] Further, in step 2, the gradient temperature curing refers to:

[0016] First stage: heating at a rate of 0.5-1.0°C / min to 60-80°C, and holding for 60-120 min;

[0017] Second stage: heating at a rate of 0.3-0.5°C / min to 100-120°C, and holding for 120-180 min;

[0018] Third stage: heating at a rate of 0.2-0.3°C / min to 160-180°C, and holding for 180-240 min.

[0019] Further, in step 2, the gradient temperature curing process applies a pressure:

[0020] First stage: applying a pressure of 0.1-0.5 MPa;

[0021] Second stage: applying a pressure of 1.0-2.0 MPa;

[0022] Third stage: applying a pressure of 1.5-2.5 MPa.

[0023] Further, in step 3, the gradient sintering refers to:

[0024] First stage: heating at a rate of 1.0-3.0°C / min to 300-400°C, and holding for 1-2 h;

[0025] Second stage: heating at a rate of 2.0-5.0°C / min to 600-800°C, and holding for 2-4 h;

[0026] Third stage: heating at a rate of 3.0-8.0°C / min to 1000-1200°C, and holding for 4-6 h.

[0027] Further, in step 3, during the gradient sintering process, the controlled pressure is 0.1-0.2 MPa, and the inert gas flow rate is 100-200 mL / min.

[0028] In a second aspect, the present application provides a preparation method of the light-weight corrosion-resistant electric soldering iron tip, comprising the following steps:

[0029] S1, preparing a substrate;

[0030] S2, forming a micron-sized SiC oxidation-resistant layer on the surface of the substrate by a chemical vapor deposition method to obtain the electric soldering iron tip.

[0031] Further, the specific steps of S2 are as follows:

[0032] Methyltrichlorosilane is used as a silicon source and a carbon source, and hydrogen is used as a carrier gas and a reducing agent to form the SiC oxidation-resistant layer on the surface of the substrate;

[0033] During the process, the temperature is controlled at 1000-1100°C, the control pressure is 4.5-5.0 KPa, the molar ratio of hydrogen and methyltrichlorosilane is (9-10):1, and the deposition time is 4-6 h.

[0034] Further, the electric soldering iron tip obtained in S2 is subjected to plasma treatment, a mixed gas of tetrafluoromethane and hydrogen is introduced, the volume ratio of tetrafluoromethane and hydrogen is 4:1, the treatment power is 80-100 W, the time is 20-30 min, and the control pressure is 45-50 Pa.

[0035] In summary, the present application has the following beneficial effects:

[0036] 1. The present application prepares a substrate by weaving a carbon fiber body with phenolic resin and gradient sintering, combines the characteristics of carbon fiber and resin, and combines the gradient heat conduction design, so that the heat distribution of the electric soldering iron tip is more uniform during work, and the welding efficiency is effectively improved.

[0037] 2. In the present application, the volume ratio of the carbon fiber body in the substrate is controlled at 40-60%, which ensures lightweight material, reduces internal stress through gradient temperature curing and gradient sintering process, and improves the mechanical properties of the electric soldering iron tip.

[0038] 3. In the present application, the surface modification layer adopts a combination of chemical vapor deposition SiC oxidation-resistant layer and plasma treatment, which significantly improves the high-temperature oxidation resistance of the electric soldering iron tip; the fluorine-containing groups introduced by plasma treatment further optimize the surface corrosion resistance. DETAILED DESCRIPTION

[0039] The technical solutions and effects of the present application are further described in detail in conjunction with the following examples. It can be understood that the specific examples described herein are only used to explain the present application, and not to limit the present application.

[0040] Example 1

[0041] The present application provides a lightweight corrosion-resistant electric soldering iron tip, which comprises a substrate and a surface modification layer.

[0042] 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.

[0043] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows:

[0044] 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.

[0045] 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.

[0046] Gradient temperature curing refers to:

[0047] 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;

[0048] 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;

[0049] 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.

[0050] Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix;

[0051] Gradient sintering refers to:

[0052] First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour;

[0053] Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours;

[0054] Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours;

[0055] During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min.

[0056] 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.

[0057] 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.

[0058] Example 2

[0059] This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which includes a substrate and a surface modification layer;

[0060] 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.

[0061] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows:

[0062] 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.

[0063] 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.

[0064] Gradient temperature curing refers to:

[0065] 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;

[0066] 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;

[0067] 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.

[0068] Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix;

[0069] Gradient sintering refers to:

[0070] First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour;

[0071] Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours;

[0072] Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours;

[0073] During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min.

[0074] 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.

[0075] 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.

[0076] Example 3

[0077] This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which includes a substrate and a surface modification layer;

[0078] 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.

[0079] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows:

[0080] 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.

[0081] 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.

[0082] Gradient temperature curing refers to:

[0083] 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;

[0084] 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;

[0085] 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.

[0086] Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix;

[0087] Gradient sintering refers to:

[0088] First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour;

[0089] Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours;

[0090] Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours;

[0091] During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min.

[0092] 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.

[0093] 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.

[0094] Example 4

[0095] This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which includes a substrate and a surface modification layer;

[0096] 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.

[0097] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows:

[0098] 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.

[0099] 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.

[0100] Gradient temperature curing refers to:

[0101] 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;

[0102] 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;

[0103] 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.

[0104] Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix;

[0105] Gradient sintering refers to:

[0106] First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour;

[0107] Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours;

[0108] Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours;

[0109] During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min.

[0110] 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.

[0111] 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.

[0112] Example 5

[0113] This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which includes a substrate and a surface modification layer;

[0114] 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.

[0115] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows:

[0116] 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.

[0117] 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.

[0118] Gradient temperature curing refers to:

[0119] 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;

[0120] 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;

[0121] 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.

[0122] Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix;

[0123] Gradient sintering refers to:

[0124] First stage: Increase the temperature to 400°C at a rate of 3.0°C / min and hold for 2 hours;

[0125] Second stage: Increase the temperature to 800°C at a rate of 5.0°C / min and hold for 4 hours;

[0126] Third stage: Increase the temperature to 1200°C at a rate of 8.0°C / min and hold for 6 hours;

[0127] During gradient sintering, the pressure was controlled at 0.2 MPa and the inert gas flow rate was 200 mL / min.

[0128] 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.

[0129] 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.

[0130] Example 6

[0131] This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which includes a substrate and a surface modification layer;

[0132] 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.

[0133] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows:

[0134] 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.

[0135] 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.

[0136] Gradient temperature curing refers to:

[0137] 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;

[0138] 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;

[0139] 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.

[0140] Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix;

[0141] Gradient sintering refers to:

[0142] First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour;

[0143] Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours;

[0144] Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours;

[0145] During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min.

[0146] 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.

[0147] 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.

[0148] Example 7

[0149] This embodiment provides a lightweight, corrosion-resistant soldering iron tip, which includes a substrate and a surface modification layer;

[0150] 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.

[0151] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows:

[0152] 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.

[0153] 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.

[0154] Gradient temperature curing refers to:

[0155] 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;

[0156] 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;

[0157] 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.

[0158] Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix;

[0159] Gradient sintering refers to:

[0160] First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour;

[0161] Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours;

[0162] Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours;

[0163] During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min.

[0164] 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.

[0165] 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.

[0166] 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.

[0167] Example 8

[0168] 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.

[0169] Comparative Example 1

[0170] This embodiment provides a soldering iron tip, which includes a base;

[0171] 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.

[0172] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows:

[0173] 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.

[0174] 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.

[0175] Gradient temperature curing refers to:

[0176] 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;

[0177] 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;

[0178] 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.

[0179] Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix;

[0180] Gradient sintering refers to:

[0181] First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour;

[0182] Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours;

[0183] Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours;

[0184] During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min.

[0185] Comparative Example 2

[0186] This embodiment provides a soldering iron tip, which includes a substrate and a surface modification layer;

[0187] 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.

[0188] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows:

[0189] 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.

[0190] 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.

[0191] Temperature curing refers to:

[0192] 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.

[0193] Step 3: Under an inert atmosphere (argon), the billet is gradient sintered and cooled to obtain the matrix;

[0194] Gradient sintering refers to:

[0195] First stage: Increase the temperature to 300°C at a rate of 1.0°C / min and hold for 1 hour;

[0196] Second stage: Increase the temperature to 600°C at a rate of 2.0°C / min and hold for 2 hours;

[0197] Third stage: Increase the temperature to 1000°C at a rate of 3.0°C / min and hold for 4 hours;

[0198] During gradient sintering, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min.

[0199] 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.

[0200] 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.

[0201] Comparative Example 3

[0202] This embodiment provides a soldering iron tip, which includes a substrate and a surface modification layer;

[0203] 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.

[0204] The method for preparing this lightweight, corrosion-resistant soldering iron tip is as follows:

[0205] 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.

[0206] 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.

[0207] Gradient temperature curing refers to:

[0208] 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;

[0209] 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;

[0210] 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.

[0211] Step 3: Sinter the blank under an inert atmosphere (argon) and cool it to obtain the matrix;

[0212] Sintering refers to:

[0213] The temperature was increased to 1000°C at a rate of 1.0°C / min and held for 7 hours.

[0214] During the sintering process, the pressure was controlled at 0.1 MPa and the inert gas flow rate was 100 mL / min;

[0215] 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.

[0216] 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.

[0217] 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.

[0218] Weight test method: Weigh using an electronic balance at room temperature.

[0219] Bending strength test method: Refer to the method in GB / T 1449-2005.

[0220] 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.

[0221] 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.

[0222] The results are shown in Table 1:

[0223] Table 1

[0224] 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

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] 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.

[0230] 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.

[0231] 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 carbon fiber reinforced phenolic resin carbonized composite material, and the matrix prepared from carbon fiber reinforced phenolic resin carbonized composite material 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 billet is gradient sintered and cooled to obtain the matrix; 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.

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, during the gradient sintering process, the pressure is controlled at 0.1~0.2MPa and the inert gas flow rate is 100~200mL / min.

7. The method for preparing the lightweight corrosion-resistant soldering iron tip according to any one of claims 1-6, 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.

8. The preparation method according to claim 7, 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.

9. The preparation method according to claim 8, 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.