WO2020010811A1

WO2020010811A1 - Ceramic-plastic composite part and preparation method therefor

Info

Publication number: WO2020010811A1
Application number: PCT/CN2018/124224
Authority: WO
Inventors: 孔德洲; 张孟军; 俞胜平; 张法亮
Original assignee: 歌尔股份有限公司
Priority date: 2018-07-12
Filing date: 2018-12-27
Publication date: 2020-01-16
Also published as: CN109093926A

Abstract

Disclosed are a ceramic-plastic (2) composite part and a preparation method therefor. The structure of the composite part comprises: a ceramic substrate (1) and a plastic (2) bonded on the ceramic substrate (1), wherein the ceramic substrate (1) at least has a first surface, at least part of the first surface has a sponge-like three-dimensional structure (11); the sponge-like three-dimensional structure (11) is interconnected ceramic particles (113) bonded as a skeleton, with the surface and the interior of the skeleton having a plurality of longitudinal pores (111) and transverse pores (112), and the plastic (2) being bonded on the first surface, which has the sponge-like three-dimensional structure (11), of the ceramic substrate (1). The method for preparing a ceramic-plastic (2) composite part can prepare the ceramic-plastic (2) composite part with a high bonding strength and a high reliability by modifying the surface of a ceramic substrate (1) to form a sponge-like three-dimensional structure (11) on the surface of the ceramic substrate (1) and injection molding the plastic (2) on the sponge-like three-dimensional structure (11) by means of a nano-injection molding technique.

Description

Ceramic and plastic composite part and preparation method thereof

Technical field

The present invention relates to the technical field of material composites, and more particularly, to a composite part of ceramic and plastic and a preparation method thereof.

Background technique

With the rapid development of electronic technology, people increasingly rely on electronic products. Nowadays, many electronic products are made of ceramic or plastic composite shells or parts, so as to achieve the beautiful appearance of the products without the signal shielding. In the field of precision machining, the existing technology generally uses glue bonding, rivet connection or reverse buckle combination for plastic parts and ceramic substrates. However, in actual applications, there are certain defects in the above methods, such as glue bonding. The method has poor rigidity, and the way of rivet connection or buckle combination increases the complexity of the product structure and affects the appearance of the product. In recent years, a nano injection molding technology (NMT) has emerged. This technology has the advantages of high bonding force, seamless integration, and high degree of automation, which is very suitable for preparing composite parts.

Ceramic material is an inorganic non-metallic material with excellent insulation and chemical resistance. If nano-injection technology is used to combine ceramics with plastic, it is difficult to form holes on the surface of the ceramic due to the good chemical resistance of the ceramic material, that is, it is difficult to prepare a surface structure suitable for nano-injection. In order to make nano-injection technology applicable to the composite process of ceramics and plastics, it is necessary to explore the surface modification technology of ceramic materials, so as to prepare ceramic and plastic composite parts with high bonding strength and high reliability.

Summary of the invention

The object of the present invention is to provide a new technical solution for a composite part of ceramic and plastic.

According to a first aspect of the present invention, a ceramic and plastic composite part is provided, comprising: a ceramic substrate and a plastic bonded to the ceramic substrate; the ceramic substrate has at least a first surface, and the first At least a part of the surface has a sponge-like three-dimensional structure; wherein the sponge-like three-dimensional structure is: a skeleton is formed by interconnected ceramic particles, the surface and the interior of the skeleton have a plurality of longitudinal and lateral holes, and the plastic is combined On a first surface of the ceramic substrate having a sponge-like three-dimensional structure.

Optionally, the plastic part is filled in the lateral holes and the longitudinal holes on the sponge-like three-dimensional structure.

Optionally, the material of the ceramic substrate is an oxide ceramic material, a nitride ceramic material, or a carbide ceramic material.

Optionally, the material of the ceramic substrate is at least one of a zirconia ceramic material, an alumina ceramic material, a silicon oxide ceramic material, a titanium oxide ceramic material, and a magnesium oxide ceramic material.

Optionally, the material of the ceramic substrate is a silicon nitride ceramic material or a boron nitride ceramic material.

Optionally, the material of the ceramic substrate is a silicon carbide ceramic material.

Optionally, the material of the plastic includes a host material and a modified material, and the modified material is added to the host material; wherein the host material is polyethylene terephthalate plastic, polymer At least one of phenylene sulfide plastic, polybutylene terephthalate plastic, and polyamide plastic; wherein the modified material is glass fiber, carbon fiber, glass flakes, calcium carbonate, magnesium carbonate, Either silica or talc.

Optionally, the thickness of the sponge-like three-dimensional structure is 1-100 μm.

Optionally, in the sponge-like three-dimensional structure: the particle diameter of the ceramic particles combined into the skeleton is 10 nm-10 μm, and the pore diameters of the lateral pores and the longitudinal pores are both 1 nm-10 μm, and From the surface to the inside of the skeleton, the pore diameters of the lateral and longitudinal holes gradually decrease.

According to a second aspect of the present invention, a method for preparing a ceramic-plastic composite part is provided, including:

Providing a ceramic substrate having at least a first surface;

Performing a surface etching treatment on the first surface of the ceramic substrate by using a fluoride acid solution to form a first intermediate on the first surface;

Corroding the first intermediate with an inorganic acid solution to obtain a sponge-like three-dimensional structure;

Plastic is injection-molded on the sponge-like three-dimensional structure to form a plastic piece, and the plastic piece is bonded to the first surface of the ceramic substrate having the sponge-like three-dimensional structure to form a composite piece of ceramic and plastic.

Optionally, in the process of performing a surface etching treatment on the ceramic substrate by using a fluoride acid solution, the method further includes: surface pretreatment, the surface pretreatment is used to remove grease on the surface of the ceramic substrate.

Optionally, in the process of performing a surface etching treatment on the ceramic substrate by using a fluoride acid solution, the processing temperature is 60 ° C.-100 ° C., and the processing time is 0.5-10 h.

Optionally, the fluoride acid solution is mainly formed by mixing fluoride, acid and deionized water, wherein the fluoride ion concentration is 0.1-5.0 mol / L, and the hydrogen ion concentration is 1-10 mol / L.

Optionally, in the process of performing the corrosion treatment on the first intermediate body by using the inorganic acid solution, the processing temperature is 40-100 ° C. and the processing time is 5-100 min.

Optionally, the inorganic acid solution is mainly made of a mixture of inorganic acid and deionized water, wherein the concentration of hydrogen ions is 1-10 mol / L.

Optionally, in the process of injecting plastic into the sponge-like three-dimensional structure to form a plastic part, the temperature of the injection mold is 100-280 ° C, the injection pressure is 30-80Mpa, and the injection speed is 10-20mm / s. .

The technical solution of the ceramic and plastic composite part provided by the embodiment of the present invention forms a loose sponge-like three-dimensional structure suitable for nano-injection on the surface of the ceramic substrate. The plastic can be firmly bonded to the ceramic substrate with Sponge-like three-dimensional structure on the surface.

The method for preparing a ceramic and plastic composite part provided by the embodiment of the present invention has a simple process and can prepare a ceramic and plastic composite part with high bonding strength and high reliability.

In order to make the foregoing objects, features, and advantages of the present invention more comprehensible, preferred embodiments are described below in detail with reference to the accompanying drawings, as follows.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solution of the embodiment of the present invention more clearly, the accompanying drawings used in the embodiment will be briefly introduced below. It should be understood that the following drawings show only certain embodiments of the invention, and therefore should not be considered as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without paying creative labor.

FIG. 1 shows a schematic structural diagram of a ceramic-plastic composite part according to an embodiment of the present invention.

FIG. 2 shows a schematic view of a sponge-like three-dimensional structure formed on a ceramic substrate according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a scanning electron microscope of a ceramic and plastic composite part according to an embodiment of the present invention.

FIG. 4 shows a flowchart of a method for preparing a ceramic-plastic composite part according to an embodiment of the present invention.

They are identified as follows:

1-ceramic substrate; 2-plastic;

11-sponge-like three-dimensional structure;

111-longitudinal hole;

112-transverse hole;

113-ceramic particles.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is actually merely illustrative and in no way serves as any limitation on the invention and its application or use.

Techniques, methods, and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but where appropriate, the techniques, methods, and equipment should be considered as part of the description.

In all examples shown and discussed herein, any specific value should be construed as exemplary only and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, so once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

The invention provides a composite part of ceramic and plastic, which can be used for processing into the shell or component of an electronic product, which can not only make the appearance of the electronic product beautiful, but also avoid the phenomenon of signal shielding. Of course, the above ceramic and plastic composite parts can also be applied to other suitable fields. FIG. 1 shows a schematic structural diagram of a ceramic and plastic composite part according to an embodiment of the present invention, FIG. 2 shows a schematic diagram of a sponge-like three-dimensional structure formed on a ceramic substrate according to an embodiment of the present invention, and FIG. 3 shows SEM schematic diagram of a ceramic and plastic composite part provided by an embodiment of the present invention. Now taking FIG. 1 to FIG. 3 as examples, the structural features and principles of the ceramic-plastic composite part of the present invention will be described.

The invention provides a composite part of ceramic and plastic, as shown in FIG. 1, comprising: a ceramic substrate 1 and a plastic 2 bonded to the ceramic substrate 1. Among them, ceramic material is an inorganic non-metal material, which has good insulation and chemical resistance.

Wherein, the ceramic substrate 1 has at least one first surface, and the first surface is used for bonding with the plastic 2. A sponge-like three-dimensional structure 11 is provided on at least a part of the first surface, and the plastic 2 is bonded to the first surface of the ceramic substrate 1 with the sponge-like three-dimensional structure 11 to form a composite part of ceramic and plastic. Among them, a sponge-like three-dimensional structure 11 suitable for nano-injection is formed on the surface of the ceramic base body 1, and this structure facilitates the firm bonding between the plastic 2 and the ceramic base body 1.

As shown in FIG. 2 and FIG. 3, the sponge-like three-dimensional structure 11 refers to a skeleton formed by interconnected ceramic particles 113. The surface and the interior of the skeleton have a plurality of longitudinal holes 111 and transverse holes 112. Among them, the ceramic particles 113 constituting the skeleton have a particle diameter of 10 nm to 10 μm, and the pore diameters of the longitudinal holes 111 and the lateral holes 112 are both 1 nm to 10 μm. From the surface of the skeleton to the inside of the skeleton, the pore diameters of the longitudinal holes 112 and the lateral holes 111 Both gradually decreased.

In the prior art, generally only longitudinal holes can be formed on the surface of a ceramic material. Compared with the prior art, as shown in FIGS. 2 and 3, the sponge-like three-dimensional structure 11 in the present invention has both longitudinal holes 111 and transverse holes 112. This special structure is beneficial to the plastic 2 and the ceramic substrate 1. The stronger bonding between the ceramic substrate 1 and the plastic 2 can maintain better mechanical properties. The composite component of ceramic and plastic obtained by injection molding with this structure has a bonding strength of ceramic matrix 1 and plastic 2 of more than 35Mpa, which can well meet the requirements of product manufacturing for the bonding strength.

Optionally, the material of the ceramic substrate may be an oxide ceramic material, a nitride ceramic material, or a carbide ceramic material.

In one example, the oxide ceramic material includes one or more composite ceramics among zirconia ceramic materials, alumina ceramic materials, silicon oxide ceramic materials, titanium oxide ceramic materials, and magnesium oxide ceramic materials. When using a variety of ceramic materials to compound, silicon oxide ceramic materials can be used as the main part, any one or more of zirconia ceramic materials, alumina ceramic materials, silicon oxide ceramic materials, titanium oxide ceramic materials, and magnesium oxide ceramic materials. Species can be used as additives. In the post-processing process, the additive helps the sponge-like three-dimensional structure to be tightly combined with the ceramic matrix, and prevents the sponge-like three-dimensional structure from cracking during the injection molding heating process.

In one example, the nitride ceramic material is a silicon nitride ceramic material or a boron nitride ceramic material. Of course, it can also be a composite ceramic composed of a silicon nitride ceramic material and a boron nitride ceramic material.

In one example, the carbide ceramic material is a silicon carbide ceramic material.

Of course, other ceramic materials can also be selected, which is not limited here.

Preferably, the thickness of the sponge-like three-dimensional structure is 1-100 μm. It can be understood that the sponge-like three-dimensional structure is formed on the surface of the ceramic substrate. Because the ceramic material itself is relatively brittle, the thickness of the sponge-like three-dimensional structure is not good for a strong bond with plastic, and too thick is not good for a strong bond with a ceramic matrix , Easy to fall off the ceramic substrate.

When plastic is combined with the sponge-like three-dimensional structure on the surface of the ceramic substrate by injection molding, part of the plastic will penetrate into the sponge-like three-dimensional structure, forming a structure in which the plastic part is filled inside the sponge-like three-dimensional structure. Alternatively, because the sponge-like three-dimensional structure has several transverse holes and longitudinal holes, part of the plastic will penetrate into the transverse and longitudinal holes, and the structure formed is that the plastic part is filled in the transverse and longitudinal holes of the sponge-like three-dimensional structure.

The composite body formed by combining ceramics and plastics can show the bright texture of ceramics without the characteristics of signal shielding, and has the characteristics of high hardness and light weight. Applying it to the shell or parts of electronic products has the characteristics of light weight, beautiful appearance and not easy to produce scratches.

In an optional implementation manner, the sponge-like three-dimensional structure has a horizontal hole and a vertical hole both having a pore diameter of 1 nm to 10 μm, and the structure may adopt an acid etching treatment or other surface treatment methods. This embodiment is not limited to this. The longitudinal and transverse holes in the sponge-like three-dimensional structure can increase the bonding strength of the plastic part and the ceramic substrate.

Further, the material of the plastic includes a main material and a modified material.

The main material is at least one of polyethylene terephthalate plastic, polyphenylene sulfide plastic, polybutylene terephthalate plastic, and polyamide plastic. The host material has good electrical insulation, heat resistance and strength, and is easy to process.

In order to further improve the mechanical properties and mechanical properties of plastic parts, modified materials can be added to the above-mentioned host material. The modified material can be used as a filler and filled in the host material to enhance the performance of the host material and expand the application range of the host material.

For example, the modified material is any one of glass fibers, carbon fibers, glass flakes, calcium carbonate, magnesium carbonate, silica, and talc. When the added modified material is plastic injection-molded into a plastic part, the thermal expansion coefficient between the plastic part and the ceramic substrate can be reduced to prevent the plastic part from shrinking, warping, or falling off; at the same time, the bending resistance of the plastic part can be improved, which can help To enhance the bond between the ceramic substrate and plastic parts.

In another aspect of this embodiment, a method for preparing a composite part is also provided, which is applied to the above ceramic and plastic composite part. Referring to FIG. 4, the method includes the following steps:

S1. A ceramic substrate is provided. The ceramic substrate has at least a first surface.

The material of the ceramic substrate is an oxide ceramic material, a nitride ceramic material, or a carbide ceramic material.

In one example, the oxide ceramic material includes one or more composite ceramics among zirconia ceramic materials, alumina ceramic materials, silicon oxide ceramic materials, titanium oxide ceramic materials, and magnesium oxide ceramic materials. When multiple ceramic materials are used for compounding, silicon oxide ceramic materials can be used as the main part, and any one or more of zirconia ceramic materials, alumina ceramic materials, titanium oxide ceramic materials, and magnesium oxide ceramic materials can be used as regulators. . In the post-processing process, the regulator helps the three-dimensional structure of the sponge-like structure to be tightly bonded to the ceramic matrix, and prevents the three-dimensional structure of the sponge-like structure from cracking during the injection molding heating process.

S2. The first surface of the ceramic substrate is surface-etched by using a fluoride acid solution to form a first intermediate on the first surface.

The fluoride acid solution is prepared, the ceramic substrate is placed in the fluoride acid solution, and the first surface of the ceramic substrate is etched by using the fluoride acid solution. The processing temperature is 60-100 ° C, and the processing time is 0.5-10h. A first intermediate is formed on the first surface of the ceramic substrate.

The structure of the first intermediate is: a skeleton is formed by interconnected ceramic particles, a plurality of longitudinal holes are formed on the surface of the skeleton, and a plurality of lateral holes are formed inside the skeleton, but within the longitudinal holes and the lateral holes Distribution of powder, debris and other substances.

The above fluoride acid solution is mainly formed by mixing fluoride, acid and deionized water; among them, the concentration of fluoride ion (F ion) is 0.1-5.0mol / L, and the concentration of hydrogen ion (H ion) is 1-10mol / L (The concentration of fluoride is prepared according to the concentration of F ions, and the concentration of acid is prepared according to the concentration of H ions).

In one example, the fluoride is a mixed fluoride composed of one or more of sodium fluoride, potassium fluoride, ammonium fluoride, ammonium hydrogen fluoride, calcium fluoride, and silicon fluoride.

In one example, the acid is a mixed acid composed of one or more of hydrochloric acid, sulfuric acid, hydrofluoric acid, nitric acid, oxalic acid, and formic acid.

In the above fluoride acidic solution, the fluorine ion (F ion) is used for etching the first surface of the ceramic substrate, and the hydrogen ion (H ion) is used to initially dissolve the horizontal and vertical holes in the first intermediate body. (Ceramics are made from powder sintering, so ceramics will leave a lot of loose powder on the surface after chemical corrosion. If plastic is directly injected on the ceramic surface, it will cause The binding force is poor, so the remaining powder and debris need to be cleaned, and these powders and debris are generally soluble in acid, so they are initially dissolved by acid).

In the process of performing surface etching treatment on the first surface of the ceramic substrate, the method further includes: surface pretreatment, the surface pretreatment is used to remove grease on the first surface. In the surface pretreatment process, the first surface of the ceramic substrate can be treated with a degreaser or degreaser for a certain period of time, such as: 300s; finally, it can be washed in deionized water and completely dried.

S3. The first intermediate is corroded by using an inorganic acid solution to obtain a loose three-dimensional structure.

The inorganic acid solution is prepared, and the first intermediate obtained in step S2 is placed in the prepared inorganic acid solution. In this process: the processing temperature is 40-100 ° C and the processing time is 5-100min to obtain a sponge-like three-dimensional structure. As shown in FIG. 2 and FIG. 3, the sponge-like three-dimensional structure is combined with interconnected ceramic particles 113 to form a skeleton, and the surface of the skeleton has a plurality of longitudinal holes 111 and transverse holes 112. Compared with the first intermediate, the longitudinal holes 111 and the transverse holes 112 on the sponge-like three-dimensional structure have larger pore diameters and stronger connectivity, so they present a loose sponge-like three-dimensional structure.

The above-mentioned inorganic acid solution is mainly made by mixing an inorganic acid and deionized water.

In one example, the inorganic acid is one or more of hydrofluoric acid, sulfuric acid, nitric acid, hydrochloric acid, and perchloric acid. Specifically, the concentration of hydrogen ions (H ions) is controlled to be 1-10 mol / L (the concentration of the acid is prepared according to the concentration of H ions).

In step S3, the inorganic acid solution is further used to process the first intermediate obtained in step S2. Specifically, the inorganic acid solution is used to further dissolve the debris, powder, and other substances in the horizontal and vertical holes to make the horizontal and vertical holes Both have a larger pore size and greater connectivity, which is conducive to the strong combination of plastic and ceramic in subsequent steps.

S4. Plastic is injection-molded on the sponge-like three-dimensional structure to form a plastic piece, and the plastic piece is combined with the first surface of the ceramic substrate having the sponge-like three-dimensional structure to form a composite piece of ceramic and plastic.

Provide an injection mold, using nano injection technology, place the sponge-like three-dimensional structure obtained in step S3 inside the injection mold, raise the temperature of the injection mold to 100-280 ° C, and then use an injection pressure of 30-80Mpa, 10- The injection speed of 20mm / s injects plastic into the sponge-like three-dimensional structure on the surface of the ceramic substrate to form a composite part of ceramic and plastic. A specific structure is that, as shown in FIG. 1, a plastic 2 is bonded to a first surface of the ceramic substrate 1 through a sponge-like three-dimensional structure 11.

Among them, plastic is made by adding modified materials to the main material. The main material is at least one of polyethylene terephthalate plastic, polyphenylene sulfide plastic, polybutylene terephthalate plastic, and polyamide plastic. The host material has good electrical insulation, heat resistance and strength, and is easy to process. The modified material is any one of glass fibers, carbon fibers, glass flakes, calcium carbonate, magnesium carbonate, silica, and talc. The modified material is added to the main material as a filler. When plastic is injection-molded on the ceramic body into a plastic part, the thermal expansion coefficient between the ceramic base and the plastic part can be reduced, and the plastic part can be prevented from shrinking, warping, or falling off. ; At the same time, it can improve the bending resistance of plastic parts and help strengthen the combination of ceramic substrate and plastic parts.

Example 1

A ceramic substrate is provided. The ceramic substrate is a plurality of zirconia ceramic plates. The zirconia ceramic plate has at least a first surface, and the first surface is used to be combined with plastic to form a composite part of ceramic and plastic.

First, the first surface of the zirconia ceramic sheet is pretreated with a degreasing agent or a degreasing agent. The purpose is to remove oil scale on the first surface, which is beneficial to the subsequent formation of a firm sponge on the first surface of the zirconia ceramic sheet. Like three-dimensional structure.

In the surface pretreatment process, the first surface of the ceramic substrate can be treated with a degreaser or degreaser for a certain period of time, such as: 300s; finally, it can be washed in deionized water and completely dried.

Secondly, a fluoride acid solution was prepared.

Add 1L of deionized water to a polyethylene container, and add sulfuric acid, hydrochloric acid, sodium fluoride, and hydrogen fluoride ammonia. The F ion concentration is 2.5mol / L, and the H ion concentration is 5mol / L. Stir and mix well. A fluoride acid solution is prepared; after that, the prepared fluoride acid solution is heated to 60 ° C.

Third, the first surface of the zirconia ceramic sheet is subjected to a surface etching treatment by using the fluoride acid solution prepared above.

The zirconia ceramic sheet was immersed in a fluoride acid solution for 10 hours, and then taken out and washed with deionized water to form a first intermediate on the first surface of the zirconia ceramic sheet.

Then, an inorganic acid solution was prepared.

Add 1L of deionized water to a polyethylene container, and add hydrofluoric acid, sulfuric acid, and nitric acid. The concentration of H ions is 5mol / L. Stir and mix thoroughly to prepare an inorganic acid solution. After that, prepare the solution. The inorganic acid solution was heated to 70 ° C.

Then, the first intermediate is immersed in the above-mentioned inorganic acid solution for 60 minutes, and after taking out, it is washed with deionized water and dried to obtain a loose sponge-like three-dimensional structure.

Finally, nano injection molding.

An injection mold is provided. The obtained sponge-like three-dimensional structure is placed in the injection mold, the injection mold is heated to 180 ° C, and a polybutylene terephthalate PBT resin containing 20% glass fiber is injection-molded on the sponge-like three-dimensional structure. Composition, to obtain a ceramic and plastic composite test piece.

The obtained test piece was fixed on a universal material testing machine for product tensile test. Five groups of test pieces were tested respectively, and the average bonding strength of the test pieces was about 35 MPa. The test results are shown in Table 1 below.

Table 1 test results

样品 sample	11	22	33	44	55	平均值average value
结合强度/MPaBonding strength / MPa	34.834.8	35.635.6	35.235.2	35.035.0	34.534.5	35.035.0

After the test piece was broken, more plastic remained on the first surface of the zirconia ceramic piece. This phenomenon indicates that the hole formation effect is good on the first surface of the zirconia ceramic sheet, and the plastic is embedded in the longitudinal and transverse holes of the sponge-like three-dimensional structure formed on the first surface of the zirconia ceramic sheet, and is firmly anchored. In a sponge-like three-dimensional structure.

Example 2

A ceramic substrate is provided. The ceramic substrate is a plurality of alumina ceramic plates. The alumina ceramic plate has at least a first surface, and the first surface is used for bonding with plastic to form a composite part of ceramic and plastic.

First, the first surface of the alumina ceramic sheet is pretreated with a degreasing agent or a degreasing agent, the purpose of which is to remove the oil scale on the first surface, which is beneficial to the subsequent formation of a firm sponge on the first surface of the alumina ceramic sheet. Like three-dimensional structure.

Secondly, a fluoride acid solution was prepared.

Add 1L of deionized water to a polyethylene container, and add sulfuric acid, hydrochloric acid, sodium fluoride, and ammonia hydrogen fluoride. The F ion concentration is 3.5mol / L, and the H ion concentration is 6mol / L. Stir and mix well. A fluoride acid solution was prepared; after that, the fluoride acid solution was heated to 60 ° C.

Third, the first surface of the alumina ceramic sheet is surface-etched by using the prepared fluoride acid solution.

The alumina ceramic sheet is immersed in a fluoride acidic solution for 10 hours, and then taken out and washed with deionized water to form a first intermediate on the first surface of the alumina ceramic sheet.

Then, an inorganic acid solution was prepared.

Add 1L of deionized water to a polyethylene container, and add hydrofluoric acid, sulfuric acid, nitric acid, hydrochloric acid, and perchloric acid. The concentration of H ions is 10mol / L. Stir and mix thoroughly to prepare an inorganic acid solution. , The prepared inorganic acid solution is heated to 70 ° C.

Next, the first intermediate was immersed in the inorganic acid solution for 60 minutes, and after taking out, it was washed with deionized water and dried to obtain a sponge-like three-dimensional structure.

Finally, nano injection molding.

Provide an injection mold, place the obtained sponge-like three-dimensional structure in the injection mold, raise the injection mold to 200 ° C, and inject a polyethylene terephthalate PET resin containing 20% glass fiber on the sponge-like three-dimensional structure. Composition, to obtain a ceramic and plastic composite test piece.

The obtained test piece was fixed on a universal material testing machine for product tensile test. Five groups of test pieces were tested respectively, and the average bonding strength of the test pieces was about 35 MPa. The test results are shown in Table 2 below.

Table 2 Test results

样品 sample	11	22	33	44	55	平均值average value
结合强度/MPaBonding strength / MPa	34.934.9	35.635.6	34.134.1	35.035.0	34.534.5	35.035.0

After the test piece was broken, more plastic remained on the first surface of the alumina ceramic piece. This phenomenon indicates that the first surface of the alumina ceramic sheet has a good hole-forming effect, and the plastic is embedded in the longitudinal and transverse holes of the sponge-like three-dimensional structure on the first surface of the alumina ceramic sheet and is firmly anchored in the sponge-like shape Three-dimensional structure.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for the purpose of illustration, and are not intended to limit the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope of the present invention. The scope of the invention is defined by the appended claims.

Claims

A composite part of ceramic and plastic, characterized in that it comprises: a ceramic substrate and a plastic bonded to the ceramic substrate; the ceramic substrate has at least a first surface, and at least a part of the first surface has a sponge Like three-dimensional structure

Wherein, the sponge-like three-dimensional structure is: a skeleton is formed by interconnected ceramic particles, the surface and the inside of the skeleton have a plurality of longitudinal holes and transverse holes, and the plastic is bonded to the ceramic matrix and has a sponge-like three-dimensional structure. On the first surface.
The composite part according to claim 1, wherein the plastic part is filled in the lateral holes and the longitudinal holes on the sponge-like three-dimensional structure.
The composite part according to claim 1, wherein a material of the ceramic substrate is an oxide ceramic material, a nitride ceramic material, or a carbide ceramic material.
The composite part according to claim 1, wherein the material of the ceramic matrix is at least one of a zirconia ceramic material, an alumina ceramic material, a silicon oxide ceramic material, a titanium oxide ceramic material, and a magnesium oxide ceramic material. .
The composite part according to claim 1, wherein a material of the ceramic substrate is a silicon nitride ceramic material or a boron nitride ceramic material.
The composite part according to claim 1, wherein a material of the ceramic substrate is a silicon carbide ceramic material.
The composite part according to claim 1, wherein the material of the plastic comprises a host material and a modified material, and the modified material is added to the host material;

The main material is at least one of polyethylene terephthalate plastic, polyphenylene sulfide plastic, polybutylene terephthalate plastic, and polyamide plastic;

The modified material is any one of glass fibers, carbon fibers, glass flakes, calcium carbonate, magnesium carbonate, silica, and talc.
The composite part according to claim 1, wherein the thickness of the three-dimensional sponge-like structure is 1-100 μm.
The composite part according to claim 1, characterized in that, in the sponge-like three-dimensional structure: the particle diameter of the ceramic particles combined into the skeleton is 10 nm-10 μm, and the pore diameters of the lateral holes and the longitudinal holes are both From 1 nm to 10 μm, and from the surface of the skeleton to the interior of the skeleton, the pore diameters of the lateral holes and the longitudinal holes gradually decrease.
A method for preparing a ceramic-plastic composite part according to claims 1-9, comprising:

Providing a ceramic substrate having at least a first surface;

Performing a surface etching treatment on the first surface of the ceramic substrate by using a fluoride acid solution to form a first intermediate on the first surface;

Corroding the first intermediate with an inorganic acid solution to obtain a sponge-like three-dimensional structure;

Plastic is injection-molded on the sponge-like three-dimensional structure to form a plastic piece, and the plastic piece is bonded to the first surface of the ceramic substrate having the sponge-like three-dimensional structure to form a composite piece of ceramic and plastic.
The preparation method according to claim 10, wherein:

In the process of performing a surface etching treatment on the ceramic substrate by using a fluoride acid solution, the method further includes: surface pretreatment, the surface pretreatment is used to remove grease on the surface of the ceramic substrate.
The preparation method according to claim 10, wherein in the process of performing a surface etching treatment on the ceramic substrate by using a fluoride acidic solution, a processing temperature is 60 ° C-100 ° C, and a processing time is 0.5- 10h.
The method according to claim 10, wherein the fluoride acid solution is mainly formed by mixing fluoride, acid and deionized water, wherein the fluoride ion concentration is 0.1-5.0 mol / L, and the hydrogen ion concentration is 1-10mol / L.
The preparation method according to claim 10, wherein in the process of performing an etching treatment on the first intermediate body by using an inorganic acid solution, a processing temperature is 40-100 ° C, and a processing time is 5-100min.
The preparation method according to claim 10, wherein the inorganic acid solution is mainly made of a mixture of inorganic acid and deionized water, wherein the concentration of hydrogen ions is 1-10 mol / L.
The preparation method according to claim 10, wherein in the process of injecting plastic into the sponge-like three-dimensional structure to form a plastic part, the temperature of the injection mold is 100-280 ° C and the injection pressure is 30- 80Mpa, injection speed is 10-20mm / s.