阅读说明：本技术 一种钢筋撕碎用超硬刀盘及制备方法 (Superhard cutter head for shredding reinforcing steel bars and preparation method ) 是由 林涛 李松庆 李泽 赵勇 沈湘洪 龚佳兴 杨岱璋 费望龙 刘昌林 于 2021-09-03 设计创作，主要内容包括：一种钢筋撕碎用超硬刀盘,包括基体和在基体上形成的类金刚石薄膜,类金刚石薄膜通过Si-O-N三元共掺杂；N原子数为Si、O和N原子总数量的16%-21%。在本发明中,以六甲基二硅氧烷、乙炔和N-2为前驱体,三元Si-O-N共掺杂类金刚石碳(DLC)涂层。通过高偏压等离子体增强化学沉积方式沉积在高硬度的刀盘基体上。通过真空退火后,在刀盘基体上的涂层的硬度达到16.9 GPa,大大的提高了刀盘的硬度,从而可以提高刀盘撕碎废旧钢筋等废旧钢材的效率。(A superhard cutter head for tearing reinforcing steel bars comprises a base body and a diamond-like carbon film formed on the base body, wherein the diamond-like carbon film is doped in a Si-O-N ternary manner; the number of N atoms is 16 to 21 percent of the total number of Si, O and N atoms. In the invention, hexamethyldisiloxane, acetylene and N are used 2 Is used as a precursor, and is a ternary Si-O-N co-doped diamond-like carbon (DLC) coating. The high-hardness cutting disc is deposited on a high-hardness cutting disc base body through a high-bias plasma enhanced chemical deposition mode. After the annealing in a vacuum is carried out,the hardness of the coating on the cutter head substrate reaches 16.9GPa, so that the hardness of the cutter head is greatly improved, and the efficiency of shredding waste steel materials such as waste steel bars and the like by the cutter head can be improved.)

1. The utility model provides a super hard blade disc is used in reinforcing bar shredding which characterized in that: the diamond-like film is formed on the substrate and is doped by Si-O-N ternary; the number of the N atoms is 16 to 21 percent of the total number of the Si, O and N atoms.

2. The superhard cutter head for shredding reinforcing steel bars according to claim 1, wherein: a WC intermediate layer is arranged between the diamond-like carbon film and the substrate.

3. The superhard cutter head for shredding reinforcing steel bars according to claim 1, wherein: the thickness of the diamond-like carbon film is 1.5-3 μm.

4. The superhard cutter head for shredding reinforcing steel bars according to claim 1, wherein: the substrate is made of steel.

5. The method for manufacturing a superhard cutter disc for shredding reinforcing steel bars according to any one of claims 1 to 4, wherein: the method comprises the following steps:

1) cleaning a substrate:respectively cleaning the surface of the substrate by using ethanol and deionized water;

will go through the stepsPutting the cleaned substrate into a chamber of a plasma chemical vapor deposition system, and then vacuumizing the chamber; ar for substrate by hot wire ion source under vacuum condition⁺Etching for 80-100 min at a current of 80-120A, a bias voltage of 180-;

2) the substrate cleaned in the step 1) is placed in acetylene and N₂Depositing for 90-150 minutes in the environment of mixed gas flow of hexamethyldisiloxane; the pressure of the chamber is between 0.8 and 1.0 Pa during deposition, and the temperature of the substrate is 300-350 ℃;

3) annealing the substrate subjected to the step 2) at a temperature of 300-500 ℃ for 3-5 hours.

6. The method for manufacturing a superhard cutter head for shredding reinforcing steel bars according to claim 5, is characterized in that: in the step 2), during deposition, a pulsed DC power supply with the frequency of 30-50kHz is used for applying a bias voltage of 600-800V to the substrate, and the current of the DC magnet coil is 2A.

7. The method for manufacturing a superhard cutter head for shredding reinforcing steel bars according to claim 5, is characterized in that: the preparation of the intermediate layer is completed before the step 2), and the preparation of the intermediate layer comprises the following steps: the WC interlayer was magnetically sputtered onto the substrate using a 5kW DC power WC target at 150-200 ℃ for 50 minutes, Ar as the working gas.

8. The method for manufacturing a superhard cutter head for shredding reinforcing steel bars according to claim 5, is characterized in that: the flow rate of the acetylene gas in the step 2) is 200-300 sccm; n is a radical of₂The flow rate is 4-40 sccm; the flow rate of hexamethyldisiloxane gas is 10-15 sccm.

Technical Field

The invention relates to a cutter head for shredding reinforcing steel bars, in particular to a superhard cutter head for shredding reinforcing steel bars and a preparation method thereof.

Background

In industrial production and urban and rural construction, a large amount of waste steel bars or other waste steel products are generated, and the waste steel bars can be returned to a furnace to make steel again, so that the resource is recycled. However, the recycled steel is irregular in shape and needs to be shredded to form reinforcing steel bar particles with relatively uniform sizes, so that the subsequent remelting production is facilitated.

When waste reinforcing steel bars are shredded into reinforcing steel bar particles, the cutter head on the reinforcing steel bar shredding is the most critical part. The cutter head is generally made of steel with high hardness, and the thickness of the cutter head is large. In the production process, two or more groups of cutter disc sets which are oppositely arranged are used for shredding the waste steel bars or other waste steel materials. Because the hardness of the steel bar is high, the common blade is easy to wear, the price of the blade disc group is high in the working process, the use cost is high, the wear resistance (hardness) of the blade is improved, the service life of the blade is prolonged, and the method has great significance for reducing the shredding cost of the waste steel bar or other waste steel products.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a superhard cutter head for shredding reinforcing steel bars and a preparation method thereof.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: a superhard cutter head for tearing reinforcing steel bars comprises a base body and a diamond-like carbon film formed on the base body, wherein the diamond-like carbon film is doped in a ternary way through Si-O-N; the number of the N atoms is 16 to 21 percent of the total number of the Si, O and N atoms.

According to the superhard cutter head for shredding the reinforcing steel bar, preferably, a WC (wolfram carbide) intermediate layer is arranged between the diamond-like carbon film and the substrate.

The superhard cutter head for tearing the reinforcing steel bar is preferably used, and the thickness of the diamond-like carbon film is 1.5-3 mu m.

The superhard cutter head for shredding the reinforcing steel bars is preferably made of steel.

A preparation method of a superhard cutter head for shredding reinforcing steel bars comprises the following steps:

1) cleaning a substrate:respectively cleaning the surface of the substrate by using ethanol and deionized water;

will go through the stepsPutting the cleaned substrate into a chamber of a plasma chemical vapor deposition system, and then vacuumizing the chamber; ar for substrate by hot wire ion source under vacuum condition⁺Etching for 80-100 min at a current of 80-120A, a bias voltage of 180-;

2) the substrate cleaned in the step 1) is placed in acetylene and N₂Depositing for 90-150 minutes in the environment of mixed gas flow of hexamethyldisiloxane; the pressure of the chamber is between 0.8 and 1.0 Pa during deposition, and the temperature of the substrate is 300-350 ℃;

3) annealing the substrate subjected to the step 2) at a temperature of 300-500 ℃ for 3-5 hours.

6. The method for manufacturing a superhard cutter head for shredding reinforcing steel bars according to claim 5, is characterized in that: in the step 2), during deposition, a pulsed DC power supply with the frequency of 30-50kHz is used for applying a bias voltage of 600-800V to the substrate, and the current of the DC magnet coil is 2A.

Preferably, in the above method for manufacturing a superhard cutter head for shredding reinforcing steel bars, the preparation of the intermediate layer is completed before the step 2), and the preparation of the intermediate layer includes the following steps: the WC interlayer was magnetically sputtered onto the substrate using a 5kW DC power WC target at 150-200 ℃ for 50 minutes, Ar as the working gas.

In the above preparation method of the superhard cutter for shredding the reinforcing steel bar, preferably, the flow rate of the acetylene gas in the step 2) is 200-300 sccm; n is a radical of₂The flow rate is 4-40 sccm; the flow rate of hexamethyldisiloxane gas is 10-15 sccm.

Compared with the prior art, the invention has the advantages that: in the invention, hexamethyldisiloxane, acetylene and N are used₂Is used as a precursor, and is a ternary Si-O-N co-doped diamond-like carbon (DLC) coating. The high-hardness cutting disc is deposited on a high-hardness cutting disc base body through a high-bias plasma enhanced chemical deposition mode. After vacuum annealing, the hardness of the coating on the cutter head substrate reaches 16.9GPa, so that the hardness of the cutter head is greatly improved, and the efficiency of shredding waste steel bars and other waste steel products by the cutter head can be improved.

Drawings

FIG. 1 shows a superhard cutter head for shredding reinforcing bars in example 1

Fig. 2 is a schematic structural view of the cutter head set after the cutter head is connected to the cutter head shaft.

FIG. 3 is a topography of a ternary codoped diamond-like film deposited on a substrate.

Detailed Description

In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below.

It should be particularly noted that when an element is referred to as being "fixed to, connected to or communicated with" another element, it can be directly fixed to, connected to or communicated with the other element or indirectly fixed to, connected to or communicated with the other element through other intermediate connecting components.

Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.

Example 1

The superhard cutter head for tearing the reinforcing steel bar as shown in figure 1 comprises a 316L stainless steel substrate and a diamond-like carbon film with the thickness of 3 mu m formed on the substrate, wherein the diamond-like carbon film is doped by Si-O-N ternary; the number of N atoms was 21% of the total number of Si, O and N atoms. In the present example, the number of atoms of Si was 55.8% and the number of atoms of O was 23.2% of the total number of atoms of Si, O and N. The hardness of the diamond-like carbon film on the cutter head substrate reaches 16.9GPa, so that the hardness of the cutter head is greatly improved, and the efficiency of shredding waste steel materials such as waste steel bars by the cutter head can be improved.

In this embodiment, a WC intermediate layer is provided between the diamond-like carbon film and the substrate. The arrangement of the intermediate layer is beneficial to improving the adhesive force between the 316L stainless steel substrate and the diamond-like carbon film.

As shown in fig. 1 and 2, when the reinforcing bar shredder works, the cutterheads are oppositely arranged; the waste steel bars are cut by the cutter heads arranged oppositely, so that the waste steel bars are shredded. In this embodiment, a diamond-like carbon film (DLC) is deposited on the surface of a base body made of 316L stainless steel, and the position where the cutter head base body is connected to the cutter head shaft may not be deposited. The 316L stainless steel has good high-temperature performance, can be continuously used at the temperature below 700 ℃, can generate a large amount of heat when used reinforcing steel bars are shredded, and is suitable for being used as a base material of the cutter head.

In the embodiment, Si-C, Si-N and Si-O bonds exist in the diamond-like carbon film after the ternary co-doping of Si-O-N, and the Si-C bonds are transformed and bonded with Si-O when the annealing temperature is higher than 490 ℃; this indicates that the Si-N bond has excellent thermal stability, and N doping can stabilize Si-O and Si-C bonds at high temperature; this also improves the high temperature stability of the diamond-like thin film on the cutter head of this embodiment. In this example, the N doping hinders the formation of O-containing bonds and enhances the Si-C bonds in the deposited ternary Si-O-N co-doped film. In addition, N doping helps stabilize Si-C and Si-O bonds and discourages graphitization during annealing. After annealing at 430 ℃, the diamond-like film maintains a hardness of 16.9 GPa.

The embodiment also provides a preparation method of the superhard cutter head for shredding the reinforcing steel bars, which comprises the following steps:

1) cleaning a substrate:respectively cleaning the surface of the substrate by using ethanol and deionized water;

will go through the stepsPutting the cleaned substrate into a chamber of a plasma chemical vapor deposition system, and then vacuumizing the chamber; ar for substrate by hot wire ion source under vacuum condition⁺Etching was carried out for 90 minutes at a current of 100A, a bias voltage of 200V and an argon flow of 250 sccm.

Completing the preparation of the intermediate layer before performing step 2), the preparation of the intermediate layer comprising the steps of: the WC interlayer was magnetically sputtered onto the substrate at 150 ℃ for 50 minutes using a WC target of 5kW DC power, Ar as the working gas.

2) The substrate cleaned in the step 1) is placed in acetylene and N₂And hexamethyldisiloxane mixed gas flow for 120 minutes; the pressure of the chamber is between 0.8 and 1.0 Pa during deposition, and the temperature of the substrate is 300 ℃; during deposition, a pulsed DC power supply with a frequency of 40kHz was used to apply a bias of 740V to the substrate, with a DC magnet coil current of 2A. Acetylene gasThe bulk flow rate was 250 sccm; n is a radical of₂The flow rate is 30 sccm; the hexamethyldisiloxane gas flow rate was 10 sccm.

3) Annealing the substrate subjected to step 2) at a temperature of 430 ℃ for 4 hours; the air pressure in the strong chamber during annealing is 5 Pa.

FIG. 3 is a topographical view of a ternary codoped diamond-like thin film deposited on a substrate, wherein the surface exhibits pits due to sparking during deposition.

In this example, the ratio of Si to O in hexamethyldisiloxane is 2:1, however, the content of O in the diamond-like thin film is reduced as analyzed by X-ray photoelectron spectroscopy (XPS), and the ratio of Si to O is about 2.4:1, mainly due to the difference in dissociation capability of the gas source and N⁺Enhancement of surface ion etching.

Example 2

The superhard cutter head for tearing the reinforcing steel bar comprises a 316L stainless steel substrate and a diamond-like carbon film with the thickness of 1.8 mu m formed on the substrate, wherein the diamond-like carbon film is doped by Si-O-N ternary; the number of N atoms is 16% of the total number of Si, O and N atoms. In the present embodiment, the number of atoms of Si is 59% of the total number of atoms of Si, O and N, and the number of atoms of O is 25% of the total number of atoms of Si, O and N. The hardness of the diamond-like thin film on the cutter base in this example was 16.1 GPa. The other parts of the superhard cutter head for shredding reinforcing bars of this embodiment are the same as those of embodiment 1.

Compared with the embodiment 1, the preparation method of the superhard cutter head for tearing the reinforcing steel bar in the embodiment is characterized in that: in the embodiment, the flow rate of the acetylene gas in the step 2) is 250 sccm; n is a radical of₂The flow rate is 4 sccm; the hexamethyldisiloxane gas flow rate was 10 sccm. The deposition time was 90 minutes. The other parts of the production process of this example were the same as in example 1.