CN216400501U

CN216400501U - Long-life wear-resistant corrosion-resistant nano coating for extruder screw

Info

Publication number: CN216400501U
Application number: CN202123155120.3U
Authority: CN
Inventors: 田庆芬; 李刚
Original assignee: Shanghai Inframat Nano Technology Co ltd
Current assignee: Shanghai Inframat Nano Technology Co ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-04-29
Anticipated expiration: 2031-12-15

Abstract

The utility model relates to a long-life wear-resistant corrosion-resistant nano coating for an extruder screw, which comprises a nano coating bottom layer and a nano ceramic coating surface layer from inside to outside; the bottom layer of the nano coating is coated on the screw base body. The nano ceramic composite coating has the advantages of wear resistance, corrosion resistance, high density and high binding force, and the nano coating material has high hardness and chemical stability.

Description

Long-life wear-resistant corrosion-resistant nano coating for extruder screw

Technical Field

The utility model belongs to the field of extruder equipment, and particularly relates to a long-life wear-resistant corrosion-resistant nano coating for extrusion single-head screws, flat screws and tapered screws of various specifications.

Background

The most critical parts of the extruder are the extruder screw and barrel, which are coated on the surface of the equipment or parts by performing plasticizing extrusion on plastic particles. The screw and the machine barrel are used in pairs, after the screw and the machine barrel are used for a period of time, the screw and the machine barrel can be worn, metal of the screw and the machine barrel body falls off, slag metal is contained in various extruded high polymer materials such as polyethylene, the surface quality of a coated product is unqualified, and meanwhile, the gap between the screw and the machine barrel is increased due to wear, the extrusion amount is reduced, and the productivity is influenced. The service life of the screw and the machine barrel is mainly influenced by the material of the screw and the polyethylene raw material. In the field use process, the screw and the machine barrel are used in pairs, and the machine is simultaneously used and scrapped, so that the machine barrel is greatly wasted, the screw is a weak part with a short service life, the imported screw and the machine barrel are expensive and have long purchase period, the service life of domestic parts is low, the extrusion rate of 3 months is reduced by more than 85%, and the traditional spare part repair technology cannot achieve ideal service life expectation. The existing more extrusion screws can not coat some functional coatings on the surface, or the functional coatings are not properly selected, so that the function improvement is not obvious.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model adopts the following technical scheme:

a long-life wear-resistant corrosion-resistant nano coating for an extruder screw comprises a nano coating bottom layer and a nano ceramic coating surface layer from inside to outside; the bottom layer of the nano coating is coated on the screw base body.

In some embodiments, the nano-ceramic coating has a surface layer thickness of 100-200 μm.

In some embodiments, the nanoceramic coating surface layer is a nanoscale cermet Ni-based or Cr-based nanoceramic composite coating.

In some forms, the nanoceramic coating surface layer comprises a ceramic material having a particle size of less than 100 nanometers.

In some modes, the density of the nano coating formed by the nano coating bottom layer and the nano ceramic coating surface layer is more than 99%.

In some forms, the screw comprises a screw head, a screw surface, a screw flight; the screw ridge protrudes out of the surface of the screw rod.

In some forms, the flights include flight leading faces, flight upper faces, flight trailing faces.

In some embodiments, the screw base comprises a screw head, a screw surface, a flight front face, a flight upper surface, a flight rear face.

In some embodiments, the screw body further comprises a tail flight surface at the screw tail end.

In some modes, the bottom layer of the nano coating and the surface layer of the nano ceramic coating are sprayed on the screw substrate in a supersonic spraying mode; the spraying speed is 500-3000 m/s.

The utility model has the beneficial effects that:

the nano ceramic composite coating has the advantages of wear resistance, corrosion resistance, high density and high bonding force, and the nano coating material has high hardness and chemical stability. The hardness of the nano coating can reach HV 850-1100; the binding force between the nano coating and the substrate can reach 80 MPa; has the effects of resisting acid mist corrosion and higher abrasion resistance.

Drawings

FIG. 1 is a schematic view of an extrusion screw;

FIG. 2 is a schematic view of the structure of a nanocoating;

FIG. 3 is a schematic view of another extrusion screw;

FIG. 4 is a schematic view of an end structure of an extrusion screw.

In the figure:

1 screw top, 2 screw surface, 3 screw edge, 301 screw edge front surface, 302 screw edge rear surface, 51 screw base body, 52 nano coating bottom layer and 53 nano ceramic coating surface layer.

Detailed Description

The utility model is further illustrated below:

the first aspect of this section introduces:

a long life abrasion and corrosion resistant nanocoating for extruder screws, as shown in fig. 1-2, comprising from inside to outside a nanocoating bottom layer 52, a nanoceramic coating top layer 53; the nano-coating bottom layer 52 is coated on the screw base body 51. The screw base 51 is not overly limited.

The thickness of the nano ceramic coating surface layer 53 is 100-200 mu m, and the thickness of the nano coating bottom layer 52 is 50-80 mu m.

In one aspect, the nanoceramic coating finish 53 is a nanoscale cermet Ni-based or Cr-based nanoceramic composite coating. The nano ceramic coating surface layer 53 contains a ceramic material with the grain size less than 100 nanometers.

In addition, the coating may also be: the nano coating bottom layer 52 is marked as INF-810425-1, and the nano ceramic coating surface layer 53 is marked as INF-810425-2. The combination of the two coatings improves the surface performance of the screw and increases the durability of the product. When in use, the two coating materials can respectively adopt some existing coatings.

The acid mist corrosion resistance of the nano coating can reach more than 15000 hours.

The density of the nano coating formed by the nano coating bottom layer 52 and the nano ceramic coating surface layer 53 is more than 99 percent.

The thickness of the nano protective layer is 150-250 mu m, wherein the nano bottom layer is a nano Ni or Cr based material, and the nano ceramic layer is a ceramic-based composite layer; the thickness of the nano bottom layer is 50-80 mu m, the thickness of the nano ceramic surface layer is 100-150 mu m, and the nano protective layer enables the screw rod and the screw edge of the extruder to have the effects of wear resistance, abrasion resistance, chemical raw material corrosion resistance, high hardness and high density.

The second aspect of this section is described with reference to some specific application examples:

in one case, as shown in fig. 1 and 3, the screw comprises a screw top 1, a screw surface 2 and a screw ridge 3; the screw ridge 3 protrudes from the surface 2 of the screw.

The nano coating can be used for coating the surface of the screw of the extruder, and comprises but is not limited to single screw, flat screw and taper screw.

As shown in fig. 4, a cross-sectional view of the head and a portion of a screw is shown.

As shown in fig. 1, the screw flight 3 includes a screw flight front surface 301, a screw flight upper surface, and a screw flight rear surface 302. The upper surface of the screw flight is a screw flight protruding end, and a screw flight front surface 301 and a screw flight rear surface 302 are respectively arranged on two sides between the upper surface of the screw flight and the surface 2 of the screw.

The screw base 51 includes a screw head 1, a screw surface 2, a flight front surface 301, a flight upper surface, a flight rear surface 302, and other screw surfaces.

The screw base 51 also includes a tail flight surface 4 at the screw tail end.

The nano coating bottom layer 52 and the nano ceramic coating surface layer 53 are sprayed on the screw rod substrate 51 in a supersonic spraying mode; the spraying speed is 500-3000 m/s.

The nano coating is prepared on the domestic extruder screw, the extrusion rate is reduced by only 5% after 1 year, the service life can reach more than 24 months, and the service life is greatly longer than that of the domestic extruder screw in the prior art by 3 months, so that the extruder screw can continuously work for a long time, the production cost is reduced, and the working efficiency is improved.

It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the utility model. All falling within the scope of protection of the present invention. The protection scheme of the utility model is subject to the appended claims.

Claims

1. The long-life wear-resistant corrosion-resistant nano coating for the screw of the extruder is characterized by comprising a nano coating bottom layer (52) and a nano ceramic coating surface layer (53) from inside to outside; the nano coating bottom layer (52) is coated on the screw base body (51).

2. The long-life wear-resistant and corrosion-resistant nanocoating for extruder screws as claimed in claim 1, wherein said nanoceramic coating facing (53) has a thickness of 100-200 μm.

3. The long-life abrasion-resistant and corrosion-resistant nanocoating for extruder screws of claim 1, wherein the nanocoating bottom layer (52) and the nanoceramic coating top layer (53) form a nanocoating density of more than 99%.

4. The long-life abrasion-resistant corrosion-resistant nanocoating for extruder screws according to claim 1, wherein said screws comprise a screw tip (1), a screw surface (2), a screw flight (3); the screw ridge (3) protrudes out of the surface (2) of the screw.

5. The long life abrasion and corrosion resistant nanocoating for extruder screws according to claim 4, wherein said flight (3) comprises a flight front face (301), a flight upper surface, a flight rear face (302).

6. The long-life abrasion-resistant corrosion-resistant nanocoating for extruder screws according to claim 5, wherein said screw base body (51) comprises a screw tip (1), a screw surface (2), a flight front face (301), a flight upper face, a flight rear face (302).

7. The long life abrasion and corrosion resistant nanocoating for extruder screws according to claim 6, wherein said screw base (51) further comprises a tail flight surface (4) at the screw tail end.

8. The long-life abrasion-resistant and corrosion-resistant nano coating for the extruder screw of claim 1, wherein the nano coating bottom layer (52) and the nano ceramic coating surface layer (53) are sprayed on the screw base body (51) by a supersonic spraying mode; the spraying speed is 500-3000 m/s.