CN216107162U - Stirring welding stirring head and diamond-like coating structure thereof - Google Patents
Stirring welding stirring head and diamond-like coating structure thereof Download PDFInfo
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- CN216107162U CN216107162U CN202121208745.9U CN202121208745U CN216107162U CN 216107162 U CN216107162 U CN 216107162U CN 202121208745 U CN202121208745 U CN 202121208745U CN 216107162 U CN216107162 U CN 216107162U
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Abstract
The utility model discloses a stirring welding stirring head and a diamond-like carbon coating structure thereof, and belongs to the field of metal coating structures. The coating structure comprises a substrate and SiO which are arranged in sequence2A bottom layer and a ta-C functional layer; also disclosed is a stir welding tool comprising a clamping zone anda non-clamping area having the coating structure. Through this coating structure of non-centre gripping district coating at the stirring head, effectual improved this stirring head in the use because of the stirring head wearing and tearing seriously and inefficacy, lead to the short problem of working life of stirring head, strengthened the wearability of stirring head, improved the working life of stirring head.
Description
Technical Field
The utility model relates to a metal coating structure, in particular to a diamond-like carbon coating, and also relates to a stirring welding stirring head containing the coating structure.
Background
Friction Stir Welding (FSW) is an advanced green, low cost solid phase Welding technique. The method is widely applied to high and new technology industries such as spacecrafts, ships, new energy automobiles and the like. Friction welding stir heads are key components in implementing this technology. In welding, there is a problem that the stirring head is worn seriously and fails. This limits the working life of the pin, which affects the quality of the welded joint.
Diamond-like carbon (DLC) films have properties of high hardness, low coefficient of friction, wear resistance, corrosion resistance, high thermal conductivity, and high chemical stability. The method is widely applied to the fields of aerospace, biomedicine, decorative appearance protection and the like. Especially, the DLC film with high Sp3 valence bond content has more excellent mechanical property and thermal stability. Tetrahedral amorphous carbon coatings (ta-C) are the hardest and best tribological diamond-like coatings available today. The content of Sp3 valence bond can reach 65% -85%, and the Vickers hardness HV0.1 can reach 4000-7000. ta-C coatings can be used for dry cutting graphite, carbon fiber, composite materials, aluminum alloys (silicon content < 12%), and other non-metallic materials. The method can be used on the surface of alloy cutters and can also be deposited on the surfaces of materials such as high-speed steel, aluminum, titanium and the like.
The material of the friction welding stirring head is tool steel. Therefore, the friction welding stirring head can be coated with the ta-C composite coating, and the high wear resistance of the stirring head is realized.
SUMMERY OF THE UTILITY MODEL
The utility model provides a friction welding stirring head and a diamond-like coating structure thereof, aiming at solving the problem that the friction welding stirring head is seriously worn and loses efficacy in welding, so that the working life of the stirring head is short. The coating structure adopts a composite coating technology, and the ta-C diamond-like composite coating is used as a protective layer of the stirring head, so that the high wear resistance of the stirring head is realized.
The technical scheme adopted by the utility model is as follows:
the structure is scribbled to diamond-like carbon of stir welding stirring head, and this structure of scribbling includes:
a substrate;
SiO2a bottom layer; and
a ta-C functional layer;
the substrate and SiO2The bottom layer and the ta-C functional layer are sequentially arranged.
In one embodiment disclosed herein, the diamond-like coating structure further comprises an insulating thermal barrier layer; the insulating and heat-insulating layer is arranged on the SiO2The bottom layer and the ta-C functional layer.
In one embodiment of the present disclosure, the insulating layer is Si3N4And (3) a layer.
In one embodiment disclosed herein, the diamond-like coating structure further comprises a transition layer; the transition layer is arranged between the insulation heat-insulation layer and the ta-C functional layer.
In one embodiment disclosed herein, the transition layer is a SiC layer.
In one embodiment disclosed herein, the ta-C functional layer has a thickness of 0.1-0.3 um.
Based on the same inventive concept, the application also discloses a stirring head for stir welding.
This stir welding stirring head includes:
the device comprises a clamping area, a transition area, a shaft shoulder and a stirring pin;
the transition zone, and/or the shoulder, and/or the pin has the aforementioned composite coating structure.
Further, the base body is a transition zone, and/or a shoulder, and/or a pin of the stir welding tool.
The utility model has the beneficial effects that:
the utility model designs a friction stir welding stirring head and a diamond-like carbon coating structure thereof, aiming at solving the problem that the friction stir welding stirring head is worn seriously and loses efficacy during welding, so that the working life of the stirring head is short. The coating structure comprises a substrate and SiO2A bottom layer and a ta-C functional layer. The coating has compact structure, strong binding force with the substrate, higher hardness and good wear resistance. The friction stir welding stirring head comprises a clamping area and a non-clamping area, wherein the non-clamping area is provided with the coating structure, so that the wear resistance of the stirring head is enhanced, and the service life of the stirring head is prolonged.
Drawings
FIG. 1 is a schematic representation of the coating architecture of the present invention;
FIG. 2 is a schematic view of a stir welding tool according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The friction welding stirring head has the advantages of no pollution, no smoke and dust, no radiation and the like in the welding process. And no other welding consumable materials, such as welding rods, welding wire, flux, shielding gas, etc., are needed during the welding process. The method is widely applied to high and new technology industries such as spacecrafts, ships, new energy automobiles and the like. The friction welding stirring head directly influences the generation of a friction heat source and the flowing of a shaping metal, so the quality of the friction welding stirring head is the key for realizing high-quality welding. In the welding process, the friction welding stirring head rotates at a high speed, and rubs with a welded material, so that the friction welding stirring head is easy to wear seriously and loses efficacy, and the service life of the stirring head is shortened.
In order to solve the problem that the friction welding stirring head is worn seriously and loses efficacy in welding, which results in short service life of the stirring head, the stirring welding stirring head and the diamond-like carbon coating structure thereof are provided in the embodiment. The coating structure is shown in figure 1 and comprises a substrate 1 and SiO2A bottom layer 2 and a ta-C functional layer 5. As shown in fig. 2, the friction welding tool includes: a clamping area 7 and a non-clamping area, a non-clamping area transition area 8, a shaft shoulder 91 and a stirring pin 92.
The stirring welding specification in this embodiment refers to stirring friction welding, and is simply referred to as stirring welding in this embodiment. All stir-welding in this document follows this explanation, unless otherwise specified.
Specifically, the substrate 1 of the coating structure is the non-clamping area portion of the stir welding tool, i.e., the transition area 8, the shoulder 91, and the pin 92 shown in fig. 2. The stir welding tool has some dirt on its surface during the manufacturing process. The presence of these contaminants affects not only the appearance of the coating, but also the adhesion between the coating and the substrate, and in the severe cases can cause the coating structure to fall off. Surface pretreatment is usually required before coating to improve the cleanliness and activation of the surfaces of the stirring head.
The processing method comprises the following steps: the substrate 1 is first subjected to a grinding and polishing process using a grinder and a polishing cloth to a mirror surface structure. And removing oxides, oil stains and other dirt on the surface of the substrate 1 by ultrasonic cleaning. The substrate 1 is then sandblasted by means of a jet-suction sander. Finally, the roughened substrate 1 is subjected to ultrasonic cleaning to remove impurities such as residual diamond grains.
After pretreatment, impurities, variegated colors and oxide layers on the surface of the substrate 1 can be removed. Meanwhile, the surface of the substrate 1 is coarsened, and the surface area is increased, so that the adhesive force of the coating can be improved, the coating can generate the strongest acid and alkali resistance, and the coating quality is improved. Simultaneously, the residual stress on the surface of the substrate 1 is reduced, and the surface hardness of the substrate 1 is improved.
Then, SiO2The bottom layer 2 is deposited on the substrate 1 by a magnetron sputtering method. SiO 22Is a three-dimensional network structure formed by covalent bonds of silicon atoms and oxygen atoms. The coating has the advantages of high melting point, high hardness, good wear resistance, low thermal conductivity and excellent adhesive force, and can form a shielding effect on the coating. So that SiO2The bottom layer 2 can improve the hardness, the wear resistance and the adhesive force of the coating and has good insulating and heat-insulating effects.
In order to enhance the insulating and heat-insulating capability of the coating structure, the SiO2And an insulating and heat-insulating layer 3 is deposited on the bottom layer 2 by adopting a magnetron sputtering method. The insulating and heat-insulating layer 3 is Si3N4And (3) a layer. Si3N4The coating has a hexagonal structure, has high hardness, good wear resistance and excellent high-temperature resistance, and can effectively improve the wear resistance and the thermal stability of the coating.
In order to strengthen the binding force between the ta-C functional layer 5 and the matrix 1, the transition layer 4 is deposited on the insulating and heat-insulating layer 3 by adopting a magnetron sputtering method. The transition layer 4 is a SiC layer. The SiC has stable chemical performance, and good high temperature resistance and wear resistance. The SiC layer is not only beneficial to reducing the internal stress between the coatings, but also can strengthen the bonding force between the coatings.
Specifically, the ta-C functional layer 5 is deposited on the transition layer 4 by adopting a high-power pulse magnetron sputtering technology. the thickness of the ta-C functional layer 5 is 0.1-0.3 um. ta-C belongs to the DLC coating, sp thereof3Bond and sp2The ratio of bonds is higher. Compared with other DLC coatings, the ta-C coating not only has the highest hardness, but also has good wear resistance and a very low friction coefficient. the ta-C functional layer 5 is used as a protective layer of the friction welding stirring head, and is beneficial to improving the wear resistance of the stirring head.
The coating structure adopts a composite coating technology, and all components of the composite coating can take advantages of strong points, weak points and synergistic effectThe defects of a single material are made up, and the performance of the single-phase material is improved. Sequential deposition of SiO on a substrate 12The bottom layer 2, the insulating and heat-insulating layer 3, the transition layer 4 and the ta-C functional layer 5. Wherein SiO is2The under layer 2 and the ta-C functional layer 5 provide the necessary wear resistance for the overall coating structure. The transition layer 4 enhances the bonding force between the coating structure and the substrate 1 while providing abrasion resistance. The insulating and heat-insulating layer 3 provides high-temperature stability and chemical stability while increasing wear resistance. The coating structure adopts a composite coating technology to enhance the wear resistance of the friction welding stirring head and prolong the service life of the stirring head.
As can be seen from the above, in this embodiment, the preparation method of the coating structure of the friction welding stir head includes:
before coating, the substrate 1 of the stir welding head is pretreated. The substrate 1 is first subjected to a grinding and polishing process using a grinder and a polishing cloth to a mirror surface structure. And then the oxide, the oil stain and other dirt on the surface of the glass are removed by ultrasonic cleaning. It is then grit blasted by a jet and suction sander. Finally, the roughened substrate 1 is subjected to ultrasonic cleaning to remove impurities such as residual diamond grains. After pretreatment, SiO is treated by magnetron sputtering method2Deposited on the substrate 1 to form SiO2A bottom layer 2. Then adopting magnetron sputtering method to make Si3N4Deposited on SiO2On the bottom layer 2, an insulating layer 3 is formed. And then depositing SiC on the insulating and heat-insulating layer 3 by adopting a magnetron sputtering method to form a transition layer 4. And finally, depositing the ta-C on the transition layer 4 by adopting a high-power pulse magnetron sputtering technology to form a ta-C functional layer 5. I.e. the coating structure is SiO2The bottom layer 2, the insulating and heat-insulating layer 3, the transition layer 4 and the ta-C functional layer 5 are sequentially deposited on the substrate 1. The coating prepared by the embodiment has a compact structure, strong binding force with a substrate, higher hardness and good wear resistance, and is beneficial to realizing the high wear resistance of the stirring head.
In the above embodiments, the material of the stir welding tool bit is tool steel. The clamping area 7 is used for positioning and clamping during welding. The non-clamping zone portions such as the transition zone 8, shoulder 91 and pin 92 have the coating structure described above.
The working principle is as follows: during operation, the stir welding head extends into the operational connection area. The friction between the stirring head and the welded material is realized by high-speed rotation of the stirring head, so that the material at the connecting part generates friction heat locally and is softened at high temperature. The material of the connecting part forms the connection through mutual diffusion and recrystallization. The shoulder 91 can rub against the metal surface to generate frictional heat, so as to prevent the deformed material of the stirring head from being ejected from the welding seam area during high-speed rotation, and simultaneously play a role in removing the surface oxide film. Along with the movement of the stirring head, the high-temperature deformed material flows to the back of the stirring head, and the material behind the stirring head is cooled to form a solid welding line.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the utility model herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the present application. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. Stirring welding stirring head's diamond-like coating structure, its characterized in that, this coating structure includes:
a base body (1);
SiO2a bottom layer (2); and
a ta-C functional layer (5);
the substrate (1) and SiO2The bottom layer (2) and the ta-C functional layer (5) are sequentially arranged from inside to outside.
2. A diamond-like coating structure for a stir welding tool according to claim 1, wherein:
the diamond-like coating structure also comprises an insulating and heat-insulating layer (3);
the insulating and heat-insulating layer (3) is arranged on the SiO2The bottom layer (2) and the ta-C functional layer (5).
3. A diamond-like coating structure for a stir welding head according to claim 2, wherein the insulating and heat-insulating layer (3) is Si3N4And (3) a layer.
4. A diamond-like coating structure for a stir welding tool according to claim 2 or 3, wherein: the diamond-like coating structure also comprises a transition layer (4);
the transition layer (4) is arranged between the insulating and heat-insulating layer (3) and the ta-C functional layer (5).
5. A diamond-like coating structure of a stir-welding tool according to claim 4, characterized in that the transition layer (4) is a SiC layer.
6. A diamond-like coating structure of a stir welding tool according to claim 1, characterized in that the ta-C functional layer (5) has a thickness of 0.1-0.3 um.
7. Stir welding stirring head, its characterized in that includes:
a clamping area (7), a transition area (8), a shaft shoulder (91) and a stirring pin (92);
the transition zone (8), and/or the shoulder (91), and/or the stirring pin (92) has a diamond-like coating structure according to any of claims 1-6.
8. A stir welding tool according to claim 7, wherein said base body (1) is a transition zone (8) of the stir welding tool, and/or a shoulder (91), and/or a pin (92).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202022490091 | 2020-11-02 | ||
| CN2020224900915 | 2020-11-02 |
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| CN216107162U true CN216107162U (en) | 2022-03-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114986092A (en) * | 2022-05-26 | 2022-09-02 | 南京航空航天大学 | Preparation method of multilayer material stirring head with microstructure array |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114986092A (en) * | 2022-05-26 | 2022-09-02 | 南京航空航天大学 | Preparation method of multilayer material stirring head with microstructure array |
| CN114986092B (en) * | 2022-05-26 | 2023-08-04 | 南京航空航天大学 | Preparation method of multi-layer material stirring head with microstructure array |
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