CN214782103U - Wear-resistant and corrosion-resistant coating for injection mold - Google Patents
Wear-resistant and corrosion-resistant coating for injection mold Download PDFInfo
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- CN214782103U CN214782103U CN202120290132.8U CN202120290132U CN214782103U CN 214782103 U CN214782103 U CN 214782103U CN 202120290132 U CN202120290132 U CN 202120290132U CN 214782103 U CN214782103 U CN 214782103U
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Abstract
The utility model discloses a wear-resistant and corrosion-resistant coating for an injection mold, which comprises a Cr bonding layer, a CrTiN multilayer structure transition layer and a CrTiN alloying functional layer which are sequentially arranged from the surface of a mold matrix to the outside; the utility model discloses a multi-arc ion plating prepares the wear-resisting corrosion resistant coating of multilayer structure on injection mold surface, obtains Cr tie coat, CrN TiN multilayer structure transition layer and CrTiN alloy functional layer in proper orderThe coating is matched with the matrix, the die coating has higher toughness and bonding strength, the multilayer interface structure inhibits the growth of large columnar crystals of CrN and TiN, the diffusion channel of a corrosive medium is prolonged, and the corrosion resistance is improved; the alloying functional layer obtains a high-density solid solution strengthening coating through a separated target arc flow technology, the hardness and the corrosion resistance of the coating are superior to those of a single-layer CrN coating, and the hardness is as high as 3200HK0.01The self-corrosion potential reaches-122 mV, the binding force reaches HF1 level, the service life of the injection mold is effectively prolonged, and the product molding quality is improved.
Description
Technical Field
The utility model relates to a coating structure technical field, concretely relates to injection mold is with wear-resisting anticorrosive coating.
Background
With the development of new energy automobiles, medical instruments and 5G industries, the demand of precision injection molding products is increasing day by day. The surface quality of an injection mold is a key factor determining the quality of plastic products and the service life of the mold. However, when plastic products containing chlorine and fluorine are processed, high-temperature forming easily decomposes corrosive gas to corrode a mold, and an injection mold is subjected to the common actions of electrochemistry and mechanical wear for a long time, so that the mold is failed early, and the forming quality of the plastic products is seriously influenced. The environment-friendly physical vapor deposition hard coating is an effective way for prolonging the service life of a die, a compact nitride ceramic material is formed on the surface of the die to improve the wear resistance and the corrosion resistance, and the existing corrosive plastic is mainly protected by a CrN coating.
With the development of novel plastics, particularly the addition of high-density glass fiber for reinforcement, the abrasion degree of an injection mold is increased, and the limited hardness of a binary CrN coating is difficult to meet the requirement of increasingly severe working conditions.
In view of the above-mentioned drawbacks, the authors of the present invention have finally obtained the present invention through long-term research and practice.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical defect, the utility model discloses a technical scheme lie in, provide an injection mold is with wear-resisting corrosion resistant coating, include the outside Cr tie coat, the CrTiN multilayer structure transition layer, the CrTiN alloying functional layer that sets gradually by the mould base member surface.
Preferably, the thickness of the Cr bonding layer is 0.1-0.5 micrometer.
Preferably, the CrTiN multilayer structure transition layer comprises a plurality of CrN layers and TiN layers, and the CrN layers and the TiN layers are alternately arranged.
Preferably, the thickness of the CrTiN multilayer structure transition layer is 2-4 microns.
Preferably, the single-layer thickness of the CrN layer is 40 to 60 nanometers, and the single-layer thickness of the TiN layer is 60 to 80 nanometers.
Preferably, the thickness of the CrTiN alloying functional layer is 3-5 microns.
Preferably, the mould base body is a mould steel base body.
Preferably, the Cr bonding layer is deposited on the surface of the mold substrate through multi-arc ion plating.
Preferably, the CrN layer and the TiN layer in the CrTiN multilayer structure transition layer are alternately deposited by multi-arc ion plating, and one CrN layer is deposited on the surface of the Cr bonding layer by multi-arc ion plating.
Preferably, the CrTiN alloying functional layer is deposited on the surface of the CrTiN multilayer structure transition layer through multi-arc ion plating.
Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model adopts multi-arc ion plating to prepare the multilayer structure wear-resistant anti-corrosion coating on the surface of the injection mold, sequentially obtain a Cr bonding layer, a CrN/TiN multilayer structure transition layer and a CrTiN alloy functional layer, the coating is matched with a matrix, the mold coating has higher toughness and bonding strength, the multilayer interface structure inhibits the growth of coarse columnar crystals of CrN and TiN, prolongs a corrosive medium diffusion channel and improves the corrosion resistance; the alloying functional layer obtains a high-density solid solution strengthening coating through a separated target arc flow technology, the hardness and the corrosion resistance of the coating are superior to those of a single-layer CrN coating, and the hardness is as high as 3200HK0.01The self-corrosion potential reaches-122 mV, the binding force reaches HF1 level, the service life of the injection mold is effectively prolonged, and the product molding quality is improved。
Drawings
FIG. 1 is a structural view of the wear and corrosion resistant coating for an injection mold.
The figures in the drawings represent:
1-a mould steel substrate; 2-Cr bonding layer; a 3-CrTiN multilayer structure transition layer; 4-CrTiN alloying functional layer.
Detailed Description
The above and further features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.
Example one
FIG. 1 is a structural view of the wear and corrosion resistant coating for an injection mold, as shown in FIG. 1; wear-resisting anti corrosion coating for injection mold includes that mould steel substrate 1 sets gradually Cr tie coat 2, CrTiN multilayer structure transition layer 3, CrTiN alloying functional layer 4 to the surface.
The wear-resistant and corrosion-resistant coating for the injection mold is prepared by multi-arc ion plating.
The thickness of the Cr bonding layer 2 is 0.1-0.5 micron, and the Cr bonding layer 2 has strong interface fusion performance and can better connect a die steel substrate and a nitride coating.
The CrTiN multilayer structure transition layer is formed by alternately depositing a CrN layer and a TiN layer, the thickness of the CrN layer and the TiN layer is 2-4 microns, and the thickness of the single CrN layer and the thickness of the single TiN layer are 40-60 nanometers and 60-80 nanometers respectively.
The CrTiN alloying functional layer has a thickness of 3 to 5 microns and comprises 30 at.% Cr, 20 at.% Ti and 50 at.% N. The hardness of the wear-resistant and corrosion-resistant coating for the injection mold reaches 3200HK0.01Above, the self-corrosion potential reaches above-122 mV, and the binding force reaches HF1 level. When the corrosive plastic containing the high-density glass fiber is subjected to injection molding, the friction and the abrasion are reduced, the corrosion of a mold is avoided, the demolding capacity is improved, and the precision and the quality of a product are improved.
The preparation method of the wear-resistant and corrosion-resistant coating for the injection mold comprises the following steps:
and S1, machining a commercial die steel P20 steel to manufacture the die steel substrate 1, grinding and polishing the die steel substrate 1 to Ra of 70nm, and ultrasonically cleaning the polished die steel substrate 1 by using an oil removing agent, distilled water and alcohol. And finally, drying the die steel substrate 1 and putting the die steel substrate into a multi-arc ion plating vacuum chamber.
S2, in order to improve the bonding strength of the Cr bonding layer 2 and the die steel substrate 1, an ion source is adopted to enhance etching cleaning. Background vacuum of the vacuum chamber is lower than 5 x 10-4Pa, heating to 450 ℃. Introducing argon gas, keeping the air pressure at 2Pa, opening a column arc Ti target, enabling the arc flow to be 80A, enabling the substrate bias voltage to be-300V, enabling the ion source current to be 60A, and carrying out high-energy argon ion etching cleaning on the die steel substrate 1 for 30min.
S3, in order to further improve the combination of the nitride layer and the steel substrate, the Cr bonding layer 2 is prepared. Closing the column arc and the ion source, opening a plane arc Cr target, setting the arc flow to be 80A, setting the substrate bias to be-100V, and depositing the Cr bonding layer 2 on the surface of the die steel substrate 1 for 20min.
S4, preparing the CrTiN multilayer structure transition layer 3. Closing argon, introducing nitrogen, keeping the air pressure at 3.5Pa, biasing to-60V, depositing the CrN layer for 3min, then closing a Cr target, opening a planar arc Ti target, depositing the TiN layer for 3min, and alternately depositing the CrN layer and the TiN layer by starting and stopping Cr and Ti separation targets, wherein the total deposition time is 120min.
S5, preparing the CrTiN alloying functional layer 4. And simultaneously starting the Cr target and the Ti target, adjusting the arc flow of the Cr target to be 100A, and continuously depositing for 60 min. The CrTiN alloyed functional layer 4 as prepared comprises 30 at.% Cr, 20 at.% Ni and 50 at.% N.
Coating the injection mold surface hardness of the wear-resistant and corrosion-resistant coating for the injection mold is 3200HK0.01The self-corrosion potential reaches above minus 122mV, the binding force reaches HF1 level, the coating performance is superior to that of a binary CrN coating, and the service life of the injection mold is prolonged.
To sum up, the utility model provides a wear-resisting corrosion resistant coating for injection mold includes Cr tie coat, the transition layer and the CrTiN alloy functional layer of CrTiN multilayer structure, and pure Cr layer has very strong interface fusion performance, can be better the connection metal matrix and nitride ceramic material; the soft and hard layer alternating multilayer structure transition layer design formed by CrN/TiN effectively reduces the residual stress of the coating, improves the density and toughness of the coating, delays the penetration of corrosive media by a multilayer interface, and improves the corrosion resistance; the CrTiN alloy functional layer is formed by solid-dissolving a TiN coating in a wide solid solution region CrN to form an alloyed coating, so that the hardness of the coating is obviously improved, and a more compact microstructure is generated, so that the alloyed coating has better wear resistance and corrosion resistance, the service performance of the injection mold is effectively improved, and the precision and the quality of a product are improved.
The foregoing is only a preferred embodiment of the present invention, which is illustrative, not limiting. Those skilled in the art will appreciate that many variations, modifications, and equivalents may be made thereto without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The wear-resistant anti-corrosion coating for the injection mold is characterized by comprising a Cr bonding layer, a CrTiN multilayer structure transition layer and a CrTiN alloying functional layer which are sequentially arranged from the surface of a mold matrix to the outside.
2. The wear and corrosion resistant coating for injection molds of claim 1, wherein said Cr bonding layer has a thickness of 0.1 to 0.5 microns.
3. The wear and corrosion resistant coating for injection molds of claim 1, wherein said transition layer of a multilayer structure of CrTiN comprises a plurality of CrN layers and TiN layers, said CrN layers and said TiN layers being alternately disposed.
4. The wear and corrosion resistant coating for injection molds of claim 3, wherein said transition layer of a CrTiN multilayer structure has a thickness of 2 to 4 microns.
5. The wear and corrosion resistant coating for injection molds of claim 3, wherein said CrN layer has a monolayer thickness of 40 nm to 60 nm and said TiN layer has a monolayer thickness of 60 nm to 80 nm.
6. The wear and corrosion resistant coating for injection molds of claim 3, wherein said CrTiN alloying functional layer has a thickness of 3 to 5 microns.
7. An abrasion resistant and corrosion resistant coating for injection molds according to claim 1, wherein said mold base comprises a mold steel base.
8. An abrasion resistant and erosion resistant coating for an injection mold as claimed in claim 1 wherein said Cr bonding layer is deposited on said mold base surface by multi-arc ion plating.
9. The wear and corrosion resistant coating for injection molds of claim 3, wherein said CrN layer and said TiN layer in said CrTiN multilayer structure transition layer are alternately deposited by multi-arc ion plating, and one of said CrN layer is deposited on said Cr bond layer surface by multi-arc ion plating.
10. The wear and corrosion resistant coating for injection molds of claim 1, wherein said CrTiN alloying functional layer is deposited on the surface of said CrTiN multilayer structure transition layer by multi-arc ion plating.
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| CN202120290132.8U CN214782103U (en) | 2021-02-01 | 2021-02-01 | Wear-resistant and corrosion-resistant coating for injection mold |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114196909A (en) * | 2021-12-03 | 2022-03-18 | 广东振华科技股份有限公司 | Method for improving bonding strength of wear-resistant protective coating on surface of insulating substrate |
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- 2021-02-01 CN CN202120290132.8U patent/CN214782103U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114196909A (en) * | 2021-12-03 | 2022-03-18 | 广东振华科技股份有限公司 | Method for improving bonding strength of wear-resistant protective coating on surface of insulating substrate |
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