CN108083852B - Method for controlling silver burning deformation of inorganic nonmetal functional material - Google Patents
Method for controlling silver burning deformation of inorganic nonmetal functional material Download PDFInfo
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- CN108083852B CN108083852B CN201711478593.2A CN201711478593A CN108083852B CN 108083852 B CN108083852 B CN 108083852B CN 201711478593 A CN201711478593 A CN 201711478593A CN 108083852 B CN108083852 B CN 108083852B
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
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Abstract
The invention provides a method for controlling silver burning deformation of an inorganic non-metallic functional material, which comprises the steps of providing a base, a pressing block and the inorganic non-metallic functional material to be sintered, wherein the inorganic non-metallic functional material is in a curved surface structure, one side of the inorganic non-metallic functional material is a convex surface, the other side of the inorganic non-metallic functional material is a concave surface, the base is provided with a groove, the concave surface of the groove is matched with the convex surface of the inorganic non-metallic functional material to be sintered, the pressing block is provided with a convex surface matched with the concave surface of the inorganic non-metallic functional material to be sintered, the diameter of the concave surface of the groove of the base and the diameter of the convex surface of the pressing block are both larger than or equal to the diameter of the. The invention provides a sandwich silver firing method, which can effectively control the deformation in the silver firing process and can not be bonded with a firing bearing device.
Description
Technical Field
The invention relates to the technical field of piezoelectric ceramics, in particular to a method for controlling silver firing deformation of an inorganic non-metallic functional material.
Background
High-intensity focused ultrasound (High-intensity focused ultrasound-sound) is a novel nondestructive and effective tumor treatment means, is an emerging in-vitro noninvasive tumor treatment technology in recent years, can accurately ablate target tissues without damaging adjacent tissues around the target, and is increasingly widely applied. The physical principle of the treatment is that ultrasonic energy is focused on a target tissue through an ultrasonic focusing transducer in a certain form, and the focused ultrasonic transducer has high energy concentration, so that the target tissue is rapidly heated to over 65 ℃ in a short time, protein denaturation is caused, irreversible coagulation necrosis occurs on the target tissue, and the aims of in-vitro treatment and noninvasive treatment on the target tissue are fulfilled. Focused ultrasound transducers are the heart of this technology, which convert electrical energy into acoustic energy, emit ultrasound waves, and focus into high energy regions. At present, the focusing ultrasonic transducer mainly adopts piezoelectric ceramics as a transducer element, the piezoelectric ceramics are designed into different shapes such as spherical surfaces, fan pits or other curved surface shapes according to different focusing modes and different indications, and shape parameters and size are determined according to the use requirements of the transducer. The manufacture of the curved surface piezoelectric element is an important technical link in the manufacture process of the transducer, wherein, how to ensure that the curved surface is invariably formed into core technical content in the manufacture process; the most easily deformed process link is piezoelectric ceramic silver firing, which is a key step of transducer element metallization, namely, silver paste is coated on the surface of ceramic, the ceramic is dried and then sintered at a high temperature of about 800 ℃, silver ions in the silver paste are reduced into silver, and the silver and the piezoelectric ceramic are well combined to metalize the ceramic element.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention aims to provide a method for controlling silver firing deformation of an inorganic non-metallic functional material, which is used to solve the problem that the inorganic non-metallic functional material in the prior art is easy to deform during silver firing.
In order to achieve the above and other related objects, a first aspect of the present invention provides a method for controlling silver burning deformation of an inorganic non-metallic functional material, which includes providing a base, a pressing block, and an inorganic non-metallic functional material to be sintered, wherein the inorganic non-metallic functional material is in a curved surface structure, one side of the inorganic non-metallic functional material is a convex surface, the other side of the inorganic non-metallic functional material is a concave surface, the base has a groove, the concave surface of the groove matches with the convex surface of the inorganic non-metallic functional material to be sintered, the pressing block has a convex surface matching with the concave surface of the inorganic non-metallic functional material to be sintered, the diameter of the pressing block is greater than or equal to the diameter of the inorganic non-metallic functional material, the inorganic non-metallic functional.
In some embodiments of the present invention, the inorganic non-metallic functional material is selected from curved piezoceramic wafers.
In some embodiments of the invention, the diameter of the concave surface of the base groove and the diameter of the convex surface of the pressing block are equal to the diameter of the curved piezoelectric ceramic plate.
In some embodiments of the invention, when the thickness of the curved piezoelectric ceramic plate is greater than 3mm, the thickness of the pressing block is 2 +/-0.2 mm.
In some embodiments of the invention, when the thickness of the curved piezoelectric ceramic plate is 1-3mm, the thickness of the pressing block is 0.8-2.2 mm.
In some embodiments of the invention, when the thickness of the curved piezoelectric ceramic plate is less than 1mm, the thickness of the pressing block is 0.8 +/-0.2 mm.
In some embodiments of the present invention, the curved piezoelectric ceramic sheet is selected from corundum ceramics.
In some embodiments of the present invention, the material of the base and the material of the compact are selected from any one of corundum ceramics and mullite.
In some embodiments of the invention, the corundum ceramic is selected from any one of corundum 95 porcelain, corundum 97 porcelain.
The second aspect of the invention provides the inorganic non-metallic functional material prepared by the method, the shape of the curved surface piezoelectric ceramic piece can be spherical, sector pit shape and the like, and the invention is also suitable for silver firing of other inorganic non-metallic functional materials.
The invention provides an assistive device for controlling silver firing deformation of an inorganic non-metallic functional material, which comprises a base and a pressing block, wherein the base is provided with a groove, the concave surface of the groove is matched with the convex surface of the inorganic non-metallic functional material to be sintered, the pressing block is provided with a convex surface matched with the concave surface of the inorganic non-metallic functional material to be sintered, and the diameter of the concave surface of the groove of the base and the diameter of the convex surface of the pressing block are both larger than or equal to the diameter of the inorganic non-metallic functional material.
In some embodiments of the present invention, the inorganic non-metallic functional material is selected from a curved piezoelectric ceramic plate, and the diameter of the concave surface of the base groove and the diameter of the convex surface of the pressing block are equal to the diameter of the curved piezoelectric ceramic plate; when the thickness of the curved surface piezoelectric ceramic piece is more than 3mm, the thickness of the pressing block is 2 +/-0.2 mm; when the thickness of the curved surface piezoelectric ceramic piece is 1-3mm, the thickness of the pressing block is 0.8-2.2 mm; when the thickness of the curved surface piezoelectric ceramic piece is less than 1mm, the thickness of the pressing block is 0.8 +/-0.2 mm.
In some embodiments of the present invention, the curved piezoelectric ceramic sheet is selected from corundum ceramics.
In some embodiments of the present invention, the material of the base and the material of the compact are selected from any one of corundum ceramics and mullite.
In some embodiments of the invention, the corundum ceramic is selected from any one of corundum 95 porcelain, corundum 97 porcelain.
As mentioned above, the method for controlling silver firing deformation of the inorganic non-metallic functional material of the invention has the following beneficial effects: the invention provides a sandwich silver firing method, which can effectively control the deformation of inorganic nonmetallic functional materials such as piezoelectric ceramics and the like in the silver firing process and can not be bonded with a firing device.
Drawings
FIG. 1 is a schematic structural diagram of a briquette according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a base according to an embodiment of the invention.
FIG. 3 is a schematic diagram showing a three-layer structure of a sandwich silver-firing method according to an embodiment of the present invention.
FIG. 4 shows the spherical radius distribution plots obtained by the two methods in the examples of the present invention.
FIG. 5 is a graph showing the results of analysis of spherical radius variance obtained by two methods in the examples of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated. The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The following description will be given by taking a spherical piezoelectric ceramic plate as an example, but the present invention is also applicable to silver firing of curved piezoelectric ceramic plates of other shapes, and also applicable to silver firing of other types of inorganic nonmetallic functional materials.
As shown in fig. 1-3, the core idea of the sandwich silver firing method of the present invention is to design a three-layer structure, wherein the first layer is a firing support base, the second layer is a workpiece (i.e., spherical piezoelectric ceramic), and the third layer is a pressing block, and the workpiece is sandwiched between the firing support base and the pressing block. The base and the pressing block are made of high-temperature-resistant materials, corundum ceramics is adopted in the embodiment, one surface of the sintering base is a plane when being processed, the other surface of the sintering base is ground into a spherical surface, and the radius of the spherical surface is the same as the outer radius of the ceramics; the briquettes are also processed into spherical surfaces, R of whichOuter coverCeramic RInner partThereby forming a sandwich structure. Because corundum belongs to high-temperature ceramic and is stable at 800 ℃, the pressing block and the base cannot deform and cannot be bonded with the silver layer, and the deformation of spherical or curved piezoelectric ceramic is effectively controlled under the clamping of two layers of high-temperature ceramic with stable materials.
It is worth noting that: the thickness of the compact is designed according to the principle that the ceramic sheet cannot be fractured under deformation control, and when the diameter of the compact is equal to the diameter of the spherical piezoelectric ceramic sheet, the thickness is generally as follows:
when the thickness of the spherical piezoelectric ceramic piece is more than 3mm, the thickness of the corundum ceramic pressing block is 2 +/-0.2 mm;
when the thickness of the spherical piezoelectric ceramic piece is 1 mm-3 mm, the thickness of the corundum ceramic pressing block is 0.8-2.2 mm;
when the thickness of the spherical piezoelectric ceramic piece is less than 1mm, the thickness of the corundum ceramic pressing block is 0.8 +/-0.2 mm;
if the thickness of the pressing block is too thin, the deformation is difficult to control; if too thick, the pressure will fracture the wafer.
The two methods are compared, and the old method adopts 95 corundum ceramics as a base and burns spherical piezoelectric ceramic plates with the spherical radius of 100mm and the thickness of 2mm at 800 ℃; the novel method adopts 95 corundum ceramic as a base and a pressing block, the workpiece is also a spherical piezoelectric ceramic piece with the spherical radius of 100mm and the thickness of 2mm, the thickness of the pressing block is 2mm, the pressing block is fired at 800 ℃, the test results are shown in table 1, and the test results are plotted for visually expressing the test results and are shown in fig. 1.
From the test results, the old method was free-sintering, the spherical radius varied greatly, the maximum and minimum values differed by 3.37mm, and the maximum and minimum values differed by 0.57mm, and the effect was very remarkable.
TABLE 1 sphere radius test data sheet before and after sintering method improvement
Fig. 4 is a graph corresponding to table 1, in which the new method refers to the method of the present invention, and the old method refers to the conventional method (the piezoelectric ceramic sheet is fired under the same conditions without placing a pressing block on the upper portion), and it can be seen from fig. 4 that the difference in the diameters of the ceramic sheets manufactured by the conventional method is significantly larger than that of the ceramic sheets manufactured by the present invention.
FIG. 5 is a graph showing the results of analysis of spherical radius variance obtained by two methods in the embodiment of the present invention, and it can be found from FIG. 5 that the variance of the present invention is effectively controlled and is close to zero, and compared with the conventional method, the problem that the functional material prepared by the conventional method is easily deformed is effectively solved.
Of course, only one groove can be arranged on the base, and a plurality of grooves can also be arranged, so that a plurality of pieces to be sintered can be placed on the base, and the quantity of products sintered at a time can be increased.
In conclusion, the invention better solves the problem of silver burning deformation of spherical or curved piezoelectric ceramics, and is very beneficial to improving the production qualification rate of the piezoelectric ceramics and improving the quality of the transducer.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (5)
1. A method for controlling silver burning deformation of an inorganic non-metallic functional material is characterized by comprising the following steps: providing a base, a pressing block and an inorganic non-metallic functional material to be sintered, wherein the inorganic non-metallic functional material is a curved piezoelectric ceramic piece, one side of the curved piezoelectric ceramic piece is a convex surface, the other side of the curved piezoelectric ceramic piece is a concave surface, the base is provided with a groove, the concave surface of the groove is matched with the convex surface of the curved piezoelectric ceramic piece to be sintered, the pressing block is provided with a convex surface matched with the concave surface of the curved piezoelectric ceramic piece to be sintered, and the diameter of the concave surface of the groove of the base and the diameter of the convex surface of the pressing; placing the curved surface piezoelectric ceramic piece on a base, and then placing a pressing block on the curved surface piezoelectric ceramic piece to form a sandwich structure, namely sintering; the base and the pressing block are made of corundum ceramics; when the thickness of the curved surface piezoelectric ceramic piece is more than 3mm, the thickness of the pressing block is 2 +/-0.2 mm; when the thickness of the curved surface piezoelectric ceramic piece is 1-3mm, the thickness of the pressing block is 0.8-2.2 mm; when the thickness of the curved surface piezoelectric ceramic piece is less than 1mm, the thickness of the pressing block is 0.8 +/-0.2 mm.
2. The method for controlling silver firing deformation of inorganic non-metallic functional material according to claim 1, characterized in that: the diameter of the concave surface of the groove of the base and the diameter of the convex surface of the pressing block are equal to the diameter of the curved surface piezoelectric ceramic piece.
3. The method for controlling silver firing deformation of inorganic non-metallic functional material according to claim 1, characterized in that: the corundum ceramic is selected from any one of corundum 95 ceramic and corundum 97 ceramic.
4. An assistive device for controlling silver burning deformation of an inorganic non-metallic functional material is characterized in that: the sintering device comprises a base and a pressing block, wherein the base is provided with a groove, the concave surface of the groove is matched with the convex surface of an inorganic non-metallic functional material to be sintered, the pressing block is provided with a convex surface matched with the concave surface of the inorganic non-metallic functional material to be sintered, and the diameter of the concave surface of the groove of the base and the diameter of the convex surface of the pressing block are both larger than or equal to the diameter of the inorganic non-metallic functional material; the inorganic non-metal functional material is selected from curved surface piezoelectric ceramic pieces, and the base and the pressing block are made of corundum ceramics; when the thickness of the curved surface piezoelectric ceramic piece is more than 3mm, the thickness of the pressing block is 2 +/-0.2 mm; when the thickness of the curved surface piezoelectric ceramic piece is 1-3mm, the thickness of the pressing block is 0.8-2.2 mm; when the thickness of the curved surface piezoelectric ceramic piece is less than 1mm, the thickness of the pressing block is 0.8 +/-0.2 mm.
5. An aid as claimed in claim 4, characterised in that: the diameter of the concave surface of the groove of the base and the diameter of the convex surface of the pressing block are equal to the diameter of the curved surface piezoelectric ceramic piece.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103143495A (en) * | 2013-02-01 | 2013-06-12 | 北京航空航天大学 | Novel 2-2 type cement based piezoelectric bending type transducer |
| CN206037724U (en) * | 2016-08-30 | 2017-03-22 | 上海富驰高科技有限公司 | Synchronous sintering bearing structure of ceramic product |
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| US5527501A (en) * | 1991-06-25 | 1996-06-18 | Nippon Soken Inc. | Process for producing piezoelectric ceramic sheet and dielectric ceramic sheet |
| CN103090661B (en) * | 2013-01-06 | 2013-09-25 | 肇庆捷成电子科技有限公司 | Piezoelectric ceramic blank piece sintering device and craft method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103143495A (en) * | 2013-02-01 | 2013-06-12 | 北京航空航天大学 | Novel 2-2 type cement based piezoelectric bending type transducer |
| CN206037724U (en) * | 2016-08-30 | 2017-03-22 | 上海富驰高科技有限公司 | Synchronous sintering bearing structure of ceramic product |
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