WO2022121085A1

WO2022121085A1 - Manufacturing method for bionic ceramic cutter and manufactured bionic ceramic cutter

Info

Publication number: WO2022121085A1
Application number: PCT/CN2021/072170
Authority: WO
Inventors: 黄传真; 李士杰; 刘含莲; 朱洪涛; 邹斌; 姚鹏; 王军
Original assignee: 山东大学
Priority date: 2020-12-07
Filing date: 2021-01-15
Publication date: 2022-06-16
Also published as: CN112521132A; ZA202110358B; CN112521132B

Abstract

Disclosed in the present invention are a manufacturing method for a bionic ceramic cutter and a manufactured bionic ceramic cutter. The bionic ceramic cutter is formed by alternately laying a hard layer material and a soft layer material. During loading, each time one layer of the hard layer material or the soft layer material is laid, a pressing head die is used for pre-pressing once, different layers are pre-pressed by means of different or the same pressing head grinding tools, and the last layer is pre-pressed by means of a pressing head die with a linear cross section, so that the interfaces of a transition zone between heterogeneous layers have different textures and are interlocked, thereby improving the crack propagation path, improving the interface bonding strength, improving the fracture toughness, and significantly prolonging the service life.

Description

A method for preparing a bionic ceramic cutting tool and the obtained bionic ceramic cutting tool

technical field

The invention discloses a preparation method of a bionic ceramic cutter and the obtained bionic ceramic cutter.

Background technique

The statements herein merely provide background related to the present invention and do not necessarily constitute prior art.

As we all know, ceramic tools have the advantages of high hardness, high strength, and can realize cutting, but they also have the characteristics of high brittleness, low fracture toughness, and low mechanical reliability.

At present, the commonly used preparation methods of bionic ceramic cutting tools are tape casting, grouting and rolling, vapor deposition, compression molding and hot pressing compounding. The tape casting method has the following problems: The technology is too high, and it is difficult for materials with complex components; the grouting method has the following problems: during the drying process, the shrinkage of the slurry is large, and the density of the obtained product is too low; the rolling film forming method has the following problems: many processing steps, The operation is complicated, and the resulting substrate is thick; the vapor deposition method has the disadvantages of low interface bonding strength and easy debonding.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing a biomimetic ceramic cutter and the obtained biomimetic ceramic cutter. The method combines the special structure of the shell nacre and the role of mineral bridges with the application of the ceramic cutter according to bionics , Without sacrificing the comprehensive performance, the difficulty of low fracture toughness is improved, and the bionic ceramic tool is prepared to achieve the advantages of controllable performance and adjustable interface, thereby improving the mechanical reliability of the ceramic tool.

In order to achieve the above object, the present invention realizes through the following technical solutions:

In the first aspect, an embodiment of the present invention provides a method for preparing a bionic ceramic cutting tool, wherein the bionic ceramic cutting tool is alternately layered with a hard layer material and a soft layer material. Layer material, a non-linear indenter die is used to pre-press once, different layers are pre-pressed with different or the same non-linear indenter, and the last layer is pre-pressed by a linear indenter die to make different layers. The interface in the transition zone between the interlayers has different textures and canine teeth, thereby improving the crack propagation path, improving the interface bonding strength and improving the fracture toughness.

As a further technical solution, the hard layer material is a composite powder composed of Al ₂ O ₃ , Si ₃ N ₄ , Ti(C,N), and Y ₂ O ₃ ; the hard layer material adopts anhydrous ethanol as a dispersion medium .

As a further technical solution, the soft layer material is a composite powder composed of Al ₂ O ₃ , SiC _w and Ni.

As a further technical solution, the preparation method of the hard layer material is as follows:

The prepared Al ₂ O ₃ , Si ₃ N ₄ , Ti(C,N), Y ₂ O ₃ composite powder was ball-milled to refine the grains; absolute ethanol was used as the dispersion medium; the ball-milled Al ₂ O _3. Si ₃ N ₄ , Ti(C,N), Y ₂ O ₃ are placed in a vacuum drying oven to dry, and then sieved after drying;

As a further technical solution, the preparation method of the soft layer material is as follows:

The soft layer material was magnetically stirred with absolute ethanol+PEG2000+distilled water, then added with SiC _w , followed by ultrasonic vibration and magnetic stirring for a set time, and then ball-milled Al ₂ O ₃ and Ni were added to form a slurry, and then ball-milled for a set time.

As a further technical solution, the specific pre-pressing and charging processes are as follows:

The dried Al ₂ O ₃ , Si ₃ N ₄ , Ti(C,N), Y ₂ O ₃ composite powder materials were put into a graphite sleeve, the lower part of the graphite sleeve was sealed with a graphite gasket, and then a Indenter molds with different textures are pre-pressed, and then loaded with Al ₂ O ₃ , SiC _w , Ni composite powder materials, pre-pressed with indenter molds, and alternately layered, each layer is pre-pressed with indenter molds once. The last layer is pre-pressed by a die with a straight cross section.

As a further technical solution, the loaded material is placed in a vacuum hot pressing sintering furnace for sintering; after the sintering is completed, it is cooled to room temperature, and the sample is taken out for surface treatment, and the preparation of the bionic ceramic tool is completed.

As a further technical solution, the material of the indenter die is graphite, and the surface thereof is processed into linear, square, sawtooth, wavy, reverse wavy and other textures.

In a second aspect, an embodiment of the present invention also provides a bionic ceramic cutter, which is produced by the aforementioned preparation method.

The beneficial effects of the above embodiments of the present invention are as follows:

The bionic ceramic cutter prepared by the above process can make the interface of the transition zone between the heterogeneous layers have different textures and zigzag, thereby improving the crack propagation path, improving the interface bonding strength, improving the fracture toughness, and greatly improving the service life.

Description of drawings

The accompanying drawings forming a part of the present invention are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation of the present invention.

Fig. 1 is the mechanical structure schematic diagram when charging of the present invention;

Fig. 2(a), Fig. 2(b), Fig. 2(c), Fig. 2(d), Fig. 2(e), Fig. 2(f), Fig. 2(g) respectively show schematic diagrams of different indenter molds of the present invention ;

Figure 3 (a) is a schematic cross-sectional view of an existing bionic ceramic cutter;

Figure 3(b), Figure 3(c), Figure 3(d), Figure 3(e), Figure 3(f), Figure 3(g), Figure 3(h), Figure 3(i), Figure 3 (j), FIG. 3(k), and FIG. 3(l) respectively represent the cross-sectional schematic diagrams of different bionic ceramic cutters proposed in the present invention;

In the figure: The distance or size between each other is exaggerated to show the position of each part, and the schematic diagram is for illustration only.

1. Indenter die, 2. Graphite sleeve, 3. Bionic ceramic tool green body, 31. First layer of powder, 32. Second layer of powder, 33. Third layer of powder, 4. Graphite gasket.

Detailed ways

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the invention clearly dictates otherwise, the singular is intended to include the plural as well, and it should also be understood that when the terms "comprising" and/or "including" are used in this specification, Indicate the presence of features, steps, operations, devices, components and/or combinations thereof;

As described in the background art, ceramic cutting tools in the prior art have the advantages of high hardness, high strength, and can realize cutting, etc. In order to solve the above technical problems, the present invention proposes a preparation method of bionic ceramic cutting tools and the obtained bionic ceramics knives.

Example 1

In a typical implementation of the present invention, this embodiment discloses a preparation method of a bionic ceramic cutter. The mould used in the preparation method includes an indenter mould and a graphite sleeve, and the bottom of the graphite sleeve is sealed by a graphite gasket. The top is open; wherein, the working surface of the indenter die can be straight, square, sawtooth, wavy or reverse wavy, etc. For details, see Figure 2(a)-Figure 2(g), Among them, Figure 2(a) is a linear indenter die; Figures 2(b) and 2(g) respectively represent a sawtooth type indenter die and a reverse sawtooth type indenter die. Figures 2(d) and 2(e) ), respectively represent the wave type indenter die and the reverse wave type indenter die; Figure 2(c) and Figure 2(f) represent the rectangular indenter die and the reverse rectangular indenter die respectively.

In the present embodiment, two kinds of indenter molds of wave type and linear type are adopted, and the steps of the preparation process are:

(1) The hard layer takes Al ₂ O ₃ as the matrix, Si ₃ N ₄ and Ti(C,N) as the reinforcing phase, Y ₂ O ₃ as the sintering aid, and is equipped with Si ₃ N ₄ , Ti(C, N), A composite of Al ₂ O ₃ , Si ₃ N ₄ , Ti(C,N) and Y ₂ O ₃ with Y ₂ O ₃ contents of 25% (wt %), 10% (wt %) and 1.5% (wt %), respectively Powder, the soft layer takes Al ₂ O ₃ as the matrix, SiC _w and Ni as toughening and strengthening phases, and is equipped with Al ₂ O ₃ , SiC _w and Ni composite powder with SiC _w and Ni content of 20% (vol%) respectively;

(2) Ball milling the prepared Al ₂ O ₃ , Si ₃ N ₄ , Ti(C,N), Y ₂ O ₃ composite powder for 72 hours to refine the crystal grains. The hard layer material adopts anhydrous ethanol as the dispersion medium. The soft layer material was magnetically stirred with absolute ethanol + PEG2000 + distilled water for 2 hours, ultrasonic vibration + magnetic stirring for 30 minutes after adding SiC _w , and Al ₂ O ₃ and Ni ball milled for 72 hours to form a slurry, and then ball milled for 15 hours;

(3) Place the ball-milled Al ₂ O ₃ , Si ₃ N ₄ , Ti(C,N), Y ₂ O ₃ and Al ₂ O ₃ , SiC _w , Ni composite powders in a vacuum drying oven to dry, respectively. Pass through 120 mesh sieve;

(4) Put the dried Al ₂ O ₃ , Si ₃ N ₄ , Ti(C,N), Y ₂ O ₃ composite powder material into the graphite sleeve, and seal the lower part with a graphite gasket, and use the surface with waves The indenter mold with wavy texture is used for pre-pressing, and then Al ₂ O ₃ , SiC _w , Ni composite powder materials are loaded, and the indenter mold with wavy texture on the surface is used for pre-pressing, and then Al ₂ O ₃ , Si ₃ N ₄ , Ti(C,N), Y ₂ O ₃ composite powder material, and finally use the indenter die with linear texture on the surface to pre-press into a blank;

(4) Put the loaded green body in a vacuum hot pressing sintering furnace for sintering, the sintering temperature is 1600°C, the sintering pressure is 32MPa, and the holding time is 30min;

(5) After the sintering is completed, it is cooled to room temperature, and the sample is taken out and subjected to surface treatment. At this point, the preparation of the bionic ceramic tool is completed, and the section of the prepared bionic ceramic tool is shown in Figure 3(h).

The above-mentioned indenter mold is made of graphite, and has a wave-shaped texture on its surface, the wave-shaped height is 0.52mm, the size of a single wave-type texture is 0.52mm, the overall height of the indenter mold is 120.52mm, and the diameter is 42mm; The main feature is layered charging. Each time a layer of material is filled, the indenter die is used for pre-pressing. Since the surface of the indenter die has a wavy texture, the interface of the transition zone between the heterogeneous layers (adjacent layers) can be Different textures and zigzag staggered, so as to improve the crack propagation path, improve the interface bonding strength, improve the fracture toughness, and greatly improve the service life.

Example 2:

This embodiment discloses a preparation method of a bionic ceramic cutter, which is mainly characterized by charging in batches, and each time a layer of material is filled, an indenter mold is used for pre-pressing once, and the surface of the indenter mold has serrated and rectangular textures. structure;

(4) Put the dried Al ₂ O ₃ , Si ₃ N ₄ , Ti(C,N), Y ₂ O ₃ composite powder material into the graphite sleeve, and seal the lower part with a graphite gasket, and use the surface with waves Type textured indenter die is pre-pressed, and then loaded with Al ₂ O ₃ , SiC _w , Ni composite powder materials, pre-pressed with an indenter die with square texture on the surface, and then Al ₂ O ₃ , Si ₃ N ₄ , Ti(C,N), Y ₂ O ₃ composite powder material, and finally use the indenter die with linear texture on the surface to pre-press into a blank;

(5) Put the loaded green body in a vacuum hot pressing sintering furnace for sintering, the sintering temperature is 1600°C, the sintering pressure is 32MPa, and the holding time is 30min;

(6) After the sintering is completed, it is cooled to room temperature, the sample is taken out, and the surface treatment is carried out. At this point, the preparation of the bionic ceramic tool is completed, and the section of the prepared bionic ceramic tool is shown in Figure 3(k).

The material of the indenter mold used in this embodiment is graphite, and its surface has a zigzag and square texture respectively. The height of the zigzag is 0.52mm, the length of the side is 0.6mm, the angle is 60°, and the height of the square is 0.52mm. , the distance between two adjacent squares is 0.52mm, the total height of the indenter die is 120.52mm, and the diameter is 42mm;

The main feature of this preparation process is layered charging. Each time a layer of material is filled, the indenter mold is used for pre-pressing. Since the surface of the indenter mold has a zigzag and square texture, the heterogeneous layer (adjacent layer The interface in the transition zone between ) has different textures and staggered teeth, so as to improve the crack propagation path, improve the interface bonding strength, improve the fracture toughness, and greatly improve the service life.

It is not difficult to understand that in other embodiments, the indenter die may also adopt other combinations of sawtooth and wave shapes, or a combination of two reverse rectangular shapes, or a combination of two sawtooth shapes, or The way of combining the square shape and the wave shape, etc., see Figure 3(b)-Figure 3(l) for details.

It should be further noted that the drawings of this embodiment are basically regular-shaped indenter molds, but the indenter mold of the present invention is not limited to the regular-shaped indenter molds given in this embodiment, The present invention can also adopt other irregular shaped indenter die, so as to form irregular texture between adjacent filler layers.

The invention adopts the molding and hot pressing compound method, also known as the tiling method, and the bionic ceramic cutter prepared by the method has the advantages of simple operation, low cost, high density, good comprehensive mechanical properties and the like.

Finally, it should be noted that although three-layer powder is used as an example in the above two embodiments, it is not difficult to understand that it can also be four-layer, five-layer, six-layer powder, etc., depending on the actual situation. The design of the powder layer is prepared, and the same indenter mold can be used for pre-pressing between different layers, or different indenter molds can be used for pre-pressing.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

A method for preparing a bionic ceramic cutting tool, wherein the bionic ceramic cutting tool is alternately layered with a hard layer material and a soft layer material. The non-linear indenter is pre-pressed once, different layers are pre-pressed with different or the same non-linear indenter, and the last layer is pre-pressed with a linear indenter die, so that the transition zone interface between the heterogeneous layers is pre-pressed. have different textures.
The method for preparing a bionic ceramic cutting tool according to claim 1, wherein the hard layer material is composed of Al 2 O 3 , Si 3 N 4 , Ti(C,N), and Y 2 O 3 Compound powder.
The method for preparing a bionic ceramic cutting tool according to claim 2, wherein the method for preparing the hard layer material is as follows:

The prepared Al 2 O 3 , Si 3 N 4 , Ti(C,N), Y 2 O 3 composite powder was ball-milled to refine the grains; absolute ethanol was used as the dispersion medium; the ball-milled Al 2 O 3. Si 3 N 4 , Ti(C,N), Y 2 O 3 are placed in a vacuum drying oven to dry, and then sieved after drying.
The method for preparing a bionic ceramic cutting tool according to claim 1, wherein the soft layer material is a composite powder composed of Al 2 O 3 , SiC w and Ni.
The method for preparing a bionic ceramic cutter according to claim 4, wherein the preparation method of the soft layer material is as follows: the soft layer material is magnetically stirred by using absolute ethanol+PEG2000+distilled water, then adding SiC w and then ultrasonically Vibration + magnetic stirring for a set time, and then adding Al 2 O 3 and Ni after ball milling to form a slurry, and then ball milling for a set time.
A kind of bionic ceramic cutting tool preparation method as claimed in claim 1, is characterized in that, pre-pressing and charging process are as follows:

The dried Al 2 O 3 , Si 3 N 4 , Ti(C,N), Y 2 O 3 composite powder materials were put into the graphite sleeve, the lower part of the graphite sleeve was sealed with a graphite gasket, and then the first One indenter mold is pre-pressed, and then Al 2 O 3 , SiC w , Ni composite powder materials are loaded, and the second type of indenter mold is used for pre-pressing, and the layers are alternately layered, and different or the same pressing is used for each layer. The head die is pre-pressed once, and the last layer is pre-pressed by a straight-line indenter die.
The method for preparing a bionic ceramic cutter according to claim 6, wherein after the pre-pressing of the whole material is completed, the loaded material is placed in a vacuum hot-pressing sintering furnace for sintering; after the sintering is completed, it is cooled to room temperature, The sample was taken out, surface treatment was carried out, and the preparation of the bionic ceramic tool was completed.
The method for preparing a bionic ceramic cutter according to claim 1, wherein the material of the indenter mold is graphite, and the shape of the working surface is linear, square, sawtooth, wave or reverse wave type.
A bionic ceramic cutting tool, characterized in that, the cutting tool is prepared by the preparation method of any one of claims 1-8.