A diamond soldering iron and its preparation method

Abstract

A diamond electric soldering iron and a preparation method thereof, the present invention aims to solve the problems that the existing metal soldering iron tip is easy to oxidize at high temperature, does not stick to tin, is corroded by acidic soldering flux, etc. The preparation method of the diamond electric soldering iron: 1. Place the diamond block on the sample table of the laser cutting machine, and use the laser to cut the diamond block into strips; 2. Use the laser to cut one end of the soldering iron tip base into a multi-faceted pyramid as the contact end of the soldering iron tip; 3. Use a grinder to grind the sharp pyramid of the contact end of the soldering iron tip base into a rounded corner; 4. Plate a titanium film or a tungsten film on the surface of the soldering iron tip base, and then anneal it in situ at 600-900°C in an inert atmosphere; 5. Assemble the metallized soldering iron tip base with the heat unit and the shell. The present invention uses diamond to prepare the electric soldering iron tip, so that the electric soldering iron tip has the advantages of corrosion resistance and oxidation resistance, high thermal conductivity and fast thermal effect, ultra-high hardness and wear resistance, easy to stick to tin, insulation without inductance, and no damage to electronic components.

Description

Technical Field

[0001] The invention belongs to the technical field of superhard materials, and in particular relates to a diamond electric soldering iron used in electronic circuits and a preparation method thereof. Background Art

[0002] The tip of the soldering iron is usually made of steel, and the working temperature is usually not more than 500℃. When the power is on, the tip will oxidize at high temperature, causing the surface to turn black. The high temperature oxidation of the probe will lose its wettability to the solder, and the use of acidic flux will also accelerate the corrosion of the tip. Since the traditional steel tip has limited heat conduction, a large amount of heat energy is lost and wasted, resulting in a lifespan of only 5-20 hours. It does not support long-term use and is a consumable item.

[0003] In order to solve the above problems, a new type of thermocouple with corrosion resistance, oxidation resistance and high thermal conductivity is needed.

[0004] There are some heat transfer probes made of special processes or materials on the market. After being designed with the method of use, they can achieve certain anti-oxidation functions and have certain wear resistance to extend the service life. For example, the patent application number is CN202122900274.4, and the patent name is "A multifunctional electric soldering iron anti-oxidation protection tooling convenient for tinning" discloses that the soldering iron tip is placed inside the liquid tin to isolate oxygen for oxidation prevention. However, this patent can only prevent the soldering iron tip from oxidation during non-working periods, and during the high-temperature working period after power is turned on, high-temperature oxidation of the soldering iron tip is still inevitable.

[0005] With the widespread use of electronic circuits and other fields and the expansion of application areas, higher requirements are placed on the quality and service life of soldering iron tips. Diamond is an atomic crystal composed entirely of carbon atoms, with sp 3 Hybrid bonding, strong sp 3 The bond makes diamond have the highest hardness and thermal conductivity in nature. It is also resistant to acid and alkali corrosion, not easy to oxidize, and has a high breakdown field strength. It is often used as drilling tools, precision tool heads, heat dissipation substrates, insulating substrates, etc. The graphitization temperature of diamond in atmospheric environment is 800℃, which is much higher than the working temperature range of electric soldering irons; and the thermal conductivity of diamond at room temperature can reach up to 2400Wm -1 K -1 . Summary of the invention

[0006] The present invention aims to solve the problems that the existing metal soldering iron tip is easily oxidized at high temperature, does not stick to tin, is corroded by acidic soldering flux, and the like, and provides a diamond electric soldering iron and a preparation method thereof.

[0007] The soldering iron tip of the diamond electric soldering iron of the present invention is made of diamond material, the surface of the diamond material is coated with a titanium film or a tungsten film, and the diamond material coated with the titanium film or the tungsten film is then in-situ annealed at 600-900° C. in an inert atmosphere to obtain a metallized soldering iron tip substrate, wherein the diamond material is single crystal diamond, polycrystalline diamond or polycrystalline diamond.

[0008] The preparation method of the diamond electric soldering iron of the present invention is achieved by the following steps:

[0009] 1. Place the diamond block on the sample table of the laser cutting machine and use the laser to cut the diamond block into strips to obtain the soldering iron tip base;

[0010] Second, use a laser to cut one end of the soldering iron tip base into a polygonal pyramid shape as the contact end of the electric soldering iron tip, and the other end of the soldering iron tip base as the fixed end;

[0011] 3. Use a grinder to grind the sharp pyramid at the contact end of the soldering iron tip base into a rounded corner to obtain the processed soldering iron tip base;

[0012] Fourth, placing the processed soldering iron tip substrate into a magnetron sputtering device, coating the surface of the processed soldering iron tip substrate with a titanium film or a tungsten film, and then in-situ annealing treatment at 600-900° C. in an inert atmosphere to obtain a metallized soldering iron tip substrate;

[0013] 5. Assemble the metallized soldering iron tip base with the heat unit and the shell to complete the preparation of the diamond soldering iron and obtain an oxidation-resistant and wear-resistant diamond soldering iron.

[0014] There is a large difference in interfacial energy between diamond and liquid solder, resulting in poor wettability of diamond by flux, that is, it is not easy to be tinned. The present invention uses carbide to form metal to metallize the surface of diamond, thereby improving the wettability of diamond by flux.

[0015] The present invention uses diamond to prepare the electric soldering iron tip, so that the electric soldering iron tip has a series of advantages such as corrosion resistance and oxidation resistance, high thermal conductivity and fast heating effect, ultra-high hardness and wear resistance, easy tinning, insulation without inductance, and no damage to electronic components, thereby avoiding the disadvantages of traditional metal soldering iron tips such as easy oxidation at high temperature, low hardness and easy wear, and short life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the diamond soldering iron tip of the present invention;

[0017] Figure 2 This is a three-dimensional schematic diagram of a diamond electric soldering iron tip prepared in the embodiment. DETAILED DESCRIPTION

[0018] Specific implementation method 1: In this implementation method, the soldering iron tip of the diamond electric soldering iron is made of diamond material, and the surface of the diamond material is coated with a titanium film or a tungsten film. The diamond material coated with the titanium film or the tungsten film is then in-situ annealed at 600-900°C in an inert atmosphere to obtain a metallized soldering iron tip substrate, and the diamond material is single crystal diamond, polycrystalline diamond or polycrystalline diamond.

[0019] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the diamond material is prepared by chemical vapor deposition (CVD) or high temperature and high pressure (HTHP).

[0020] Specific implementation method three: The preparation method of the diamond electric soldering iron in this implementation method is implemented according to the following steps:

[0021] 1. Place the diamond block on the sample table of the laser cutting machine and use the laser to cut the diamond block into strips to obtain the soldering iron tip base;

[0022] Second, use a laser to cut one end of the soldering iron tip base into a polygonal pyramid shape as the contact end of the electric soldering iron tip, and the other end of the soldering iron tip base as the fixed end;

[0023] 3. Use a grinder to grind the sharp pyramid at the contact end of the soldering iron tip base into a rounded corner to obtain the processed soldering iron tip base;

[0024] Fourth, placing the processed soldering iron tip substrate into a magnetron sputtering device, coating the surface of the processed soldering iron tip substrate with a titanium film or a tungsten film, and then in-situ annealing treatment at 600-900° C. in an inert atmosphere to obtain a metallized soldering iron tip substrate;

[0025] 5. Assemble the metallized soldering iron tip base with the heat unit and the shell to complete the preparation of the diamond soldering iron and obtain an oxidation-resistant and wear-resistant diamond soldering iron.

[0026] In this embodiment, the diamond cone is coaxial with the diamond strip, and the length is preferably in the range of 1 / 10 to 9 / 10 of the total length of the diamond strip.

[0027] This embodiment proposes an electric soldering iron tip made of diamond and a preparation method thereof, which has a series of advantages such as corrosion resistance and oxidation resistance, high thermal conductivity and rapid thermal effect, ultra-high hardness and wear resistance, insulation without inductance, and no damage to electronic components, and solves the key problems of low thermal conductivity and easy physical and chemical damage of traditional metal thermocouples.

[0028] Specific implementation method 4: This implementation method is different from specific implementation method 3 in that the length of the diamond block in step 1 is 10 to 100 mm.

[0029] Specific implementation mode 5: This implementation mode is different from specific implementation mode 3 or 4 in that in step 2, one end of the soldering iron tip base is cut into a cone, a triangular pyramid, a quadrangular pyramid or a pentagonal pyramid.

[0030] Specific implementation example 6: This implementation example is different from any one of specific implementation examples 3 to 5 in that the thickness of the titanium film or tungsten film on the surface of the soldering iron tip substrate processed in step 4 is 50 nm to 300 nm.

[0031] Specific implementation method 7: This implementation method is different from any one of specific implementation methods 3 to 5 in that the in-situ annealing time in step 4 is 30 to 120 minutes.

[0032] Specific implementation eight: This implementation differs from any one of specific implementations three to seven in that the heat unit described in step four is a ceramic heating core or a nickel-chromium heating wire.

[0033] Specific embodiment 9: This embodiment is different from any one of specific embodiments 3 to 8 in that the processed soldering iron tip base and the heat unit in step 4 are assembled by welding, pasting or plugging.

[0034] In this embodiment, a deep hole can be machined at the end of the diamond bar using laser, and the heat unit can be inserted into the hole of the diamond bar; or there can be a hole inside the heat unit, and the diamond bar is located inside the heat unit.

[0035] Specific implementation example ten: This implementation example is different from any one of specific implementation examples three to nine in that the processed soldering iron tip base and the shell are connected by welding, pasting, plugging or bolting in step four.

[0036] In this embodiment, the plug-in uses a slot or a mortise and tenon structure for fixed connection.

[0037] Embodiment: The preparation method of the diamond electric soldering iron of this embodiment is implemented according to the following steps:

[0038] 1. Place the diamond block on the sample table of the laser cutting machine, and use the laser to cut the diamond block into a quadrangular prism with a length of 40 mm, a width of 3 mm, and a height of 3 mm to obtain the soldering iron tip base;

[0039] Second, use laser to cut one end of the soldering iron tip base into a quadrangular pyramid with a length of 10 mm, which is used as the contact end of the electric soldering iron tip. The other end of the soldering iron tip base is used as the fixed end. Use laser to cut a φ2.1 mm penetration hole perpendicular to the long side of the diamond strip at the fixed end.

[0040] 3. Use a grinder to grind the sharp pyramid at the contact end of the soldering iron tip base into a rounded corner to obtain the processed soldering iron tip base;

[0041] Fourth, the processed soldering iron tip substrate is placed in a magnetron sputtering device, a titanium film is plated on the surface of the processed soldering iron tip substrate, the thickness of the titanium film is 100 nm, and then an in-situ annealing treatment is performed at 900° C. for 30 minutes in an inert atmosphere to obtain a metallized soldering iron tip substrate;

[0042] 5. Bring the metallized soldering iron tip base into thermal contact with the resistance wire. After the resistance wire is connected to the temperature control circuit and the power cord, use a bolt to pass through the penetration hole in step 2 to assemble the processed soldering iron tip base with the shell handle to obtain an oxidation-resistant and wear-resistant diamond soldering iron.

[0043] In step 1 of this embodiment, the diamond block is selected from a piece of CVD polycrystalline diamond with a uniform and complete surface, a diameter of 80 mm, a thickness of 5 mm, and a grain size of 30 to 70 μm.

[0044] The working temperature of the electric soldering iron prepared in this embodiment is 200-500°C. The use of CVD polycrystalline diamond as the soldering iron tip has the advantages of high temperature oxidation resistance, wear resistance, acid and alkali corrosion resistance, fast heat transfer, high thermal effect, easy tinning, no inductance, and no damage to electronic components, which can significantly extend the working life of the soldering iron tip and reduce the cost of daily maintenance and update. Traditional metal soldering iron tips are prone to oxidation at high temperatures, no tinning, corrosion by acidic flux, etc., have a short service life and need to be replaced frequently.

Claims

1. A method for preparing a diamond electric soldering iron, wherein the tip of the diamond electric soldering iron is made of diamond material, the surface of the diamond material is coated with a titanium film, the diamond material coated with the titanium film is then in-situ annealed at 900° C. in an inert atmosphere to obtain a metallized soldering iron tip substrate, wherein the diamond material is single crystal diamond, polycrystalline diamond or polycrystalline diamond; characterized in that The preparation method of the diamond soldering iron is achieved by the following steps:

1. Place the diamond block on the sample table of the laser cutting machine and use the laser to cut the diamond block into strips to obtain the soldering iron tip base; Second, use a laser to cut one end of the soldering iron tip base into a polygonal pyramid shape as the contact end of the electric soldering iron tip, and the other end of the soldering iron tip base as the fixed end; 3. Use a grinder to grind the sharp pyramid at the contact end of the soldering iron tip base into a rounded corner to obtain the processed soldering iron tip base; Fourth, the processed soldering iron tip substrate is placed in a magnetron sputtering device, a titanium film with a thickness of 100 nm is plated on the surface of the processed soldering iron tip substrate, and then an in-situ annealing treatment is performed at 900° C. for 30 minutes in an inert atmosphere to obtain a metallized soldering iron tip substrate; 5. Assemble the metallized soldering iron tip base with the heat unit and the shell to complete the preparation of the diamond soldering iron and obtain an oxidation-resistant and wear-resistant diamond soldering iron.

2. The method for preparing a diamond electric soldering iron according to claim 1, characterized in that In step 1, the length of the diamond block is 10-100 mm.

3. The method for preparing a diamond electric soldering iron according to claim 1, characterized in that In step 2, one end of the soldering iron tip base is cut into a triangular pyramid, a quadrangular pyramid or a pentagonal pyramid.

4. The method for preparing a diamond electric soldering iron according to claim 1, characterized in that The heat unit described in step five is a ceramic heating core or a nickel-chromium heating wire.

5. The method for preparing a diamond electric soldering iron according to claim 1, characterized in that In step 5, the metallized soldering iron tip base and the heat unit are assembled by welding, pasting or plugging.

6. The method for preparing a diamond electric soldering iron according to claim 1, characterized in that In step 5, the metallized soldering iron tip base and the shell are connected by welding, pasting, plugging or bolting.

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