CN111907147A - LaFeSi-based magnetic refrigeration sandwich plate, preparation method and processing device thereof - Google Patents
LaFeSi-based magnetic refrigeration sandwich plate, preparation method and processing device thereof Download PDFInfo
- Publication number
- CN111907147A CN111907147A CN202010817245.9A CN202010817245A CN111907147A CN 111907147 A CN111907147 A CN 111907147A CN 202010817245 A CN202010817245 A CN 202010817245A CN 111907147 A CN111907147 A CN 111907147A
- Authority
- CN
- China
- Prior art keywords
- lafesi
- based magnetic
- magnetic refrigeration
- plate
- panel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/162—Cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/164—Drying
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/012—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials adapted for magnetic entropy change by magnetocaloric effect, e.g. used as magnetic refrigerating material
- H01F1/015—Metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses a LaFeSi-based magnetic refrigeration sandwich panel, a preparation method and a processing device thereof, wherein the LaFeSi-based magnetic refrigeration sandwich panel takes Q235 steel as a core plate and takes an as-cast LaFeSi magnetic refrigeration panel as a panel, the core plate is clamped between an upper panel and a lower panel, the LaFeSi-based magnetic refrigeration sandwich panel with blind holes is prepared by stirring friction processing and stirring friction point processing, and overflow materials generated by the stirring friction point processing are accumulated around the blind holes. The method comprises the following steps: performing multi-pass friction stir processing on the interface of a panel plate and a core plate of the LaFeSi-based magnetic refrigeration sandwich plate; processing friction stir points on the surface of the panel board to generate blind holes on the surface of the board; the excessive material generated by the friction stir spot machining is accumulated on the surface of the panel around the blind hole. The LaFeSi-based magnetic refrigeration sandwich plate prepared by the invention has the characteristics of high strength of a Q235 core plate and high-efficiency refrigeration of the LaFeSi-based magnetic refrigeration plate, and all component elements are uniformly distributed.
Description
Technical Field
The invention belongs to the technical field of functional plate preparation, and particularly relates to a LaFeSi-based magnetic refrigeration sandwich plate, a preparation method and a processing device thereof.
Background
The traditional gas compression refrigeration is cooled through the action of a Freon refrigerant, the refrigeration mode has the problems of low refrigeration efficiency, large environmental pollution, large noise pollution and the like, and particularly, the use of Freon can seriously damage the ozone layer to generate the greenhouse effect. Therefore, it is imperative to develop a new refrigeration technology with high efficiency and no pollution. Magnetic refrigeration is widely reported by researchers as a novel refrigeration method. The refrigeration mode is to carry out heat conversion through a solid refrigeration working medium, and has the characteristics of high refrigeration efficiency, reversible process, stability, reliability and the like. In addition, the solid refrigerant effectively solves the problems of environmental pollution, low refrigeration efficiency and the like caused by gas compression refrigeration, and provides a reliable refrigeration working medium for a high-efficiency refrigeration technology. The LaFeSi-based magnetic refrigeration sheet is a typical solid refrigeration working medium, and the sheet becomes one of the most important magnetocaloric effect sheets due to the characteristics of low phase change driving field, small hysteresis, easy Curie temperature adjustment, low price and the like.
The main preparation method of the LaFeSi-based magnetic refrigeration plate comprises the following steps: the traditional technologies of electric arc melting, plasma sintering, hot pressing and the like. The LaFeSi-based magnetic refrigeration plate prepared by the method has the defects of easy generation of air holes, thermal cracks, uneven structure, low strength and the like, and the strength of the LaFeSi-based magnetic refrigeration plate is seriously reduced, so that the further development of the magnetic refrigeration plate is limited. In addition, the traditional preparation of the LaFeSi-based magnetic refrigeration plate requires at least 72 hours of annealing time to ensure the normal use performance, and the production efficiency is extremely low.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention aims to provide the LaFeSi-based magnetic refrigeration sandwich plate, the preparation method and the processing device thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the LaFeSi-based magnetic refrigeration sandwich plate is characterized in that Q235 steel is used as a core plate, an as-cast LaFeSi magnetic refrigeration plate is used as a face plate, the core plate is clamped between an upper face plate and a lower face plate, and the LaFeSi-based magnetic refrigeration sandwich plate with blind holes is manufactured through friction stir processing and friction stir point processing.
Furthermore, overflow materials generated by friction stir point processing are accumulated around the blind hole.
The invention also discloses a preparation method of the LaFeSi-based magnetic refrigeration sandwich plate, which comprises the steps of firstly, carrying out multi-pass friction stir processing on the interface of the panel plate and the core plate of the LaFeSi-based magnetic refrigeration sandwich plate; then, carrying out friction stir point processing on the surface of the panel plate to generate a blind hole on the surface of the plate; and finally, accumulating overflowing materials generated by the friction stir point processing on the surface of the panel around the blind hole.
Furthermore, the parameters of the multi-pass friction stir processing are as follows: the rotation speed is 475-750 rpm, the advancing speed is 30-47.5 mm/min, the pressing amount is 0.2-0.3 mm, and the pressing speed of the stirring pin is 20 mm/min.
Further, the friction stir point processing parameters are as follows: the rotating speed is 750-1100 rpm; the pressing amount of the shaft shoulder is 0, the distance between the shaft shoulder and the surface of the plate is 0.4-0.8 mm, and the pressing speed of the stirring needle is 30 mm/min.
The invention also discloses a processing device of the LaFeSi-based magnetic refrigeration sandwich plate, which realizes the preparation method of the LaFeSi-based magnetic refrigeration sandwich plate, and comprises a shaft shoulder and a stirring pin which are sequentially connected, wherein the shaft shoulder is cylindrical, and the diameter of the shaft shoulder is 10-18 mm;
the stirring pin is cylindrical and conical, the diameter of the cylindrical stirring pin is 3-6 mm, and the length of the cylindrical stirring pin is 3.2-5.4 mm; the root diameter of the conical stirring needle is 4-8 mm, and the length of the conical stirring needle is 5.2-5.4 mm.
Specifically, the material of the processing device is tungsten-rhenium alloy.
Compared with the prior art, the invention has the following technical effects:
(1) the invention solves the problems of low tissue density and low strength caused by the defects of easy generation of air holes, thermal cracks, nonuniform tissues and the like of the LaFeSi-based magnetic refrigeration plate prepared by the existing preparation method.
(2) The LaFeSi-based magnetic refrigeration sandwich plate prepared by combining the friction stir processing and the friction stir point processing method has the characteristics of high strength of the Q235 core plate and high-efficiency refrigeration of the LaFeSi-based magnetic refrigeration plate.
(3) The invention overcomes the technical problem that the LaFeSi-based magnetic refrigeration sheet is difficult to process due to inherent high brittleness, prepares the high-strength and porous LaFeSi-based magnetic refrigeration sandwich sheet, and effectively improves the refrigeration efficiency of the LaFeSi-based magnetic refrigeration sheet.
(4) The board in the blind hole takes place to spill over in the friction stir spot course of working, and the stirring pin of high-speed rotation extrudes it around the blind hole and plastify to adhere to on the surface of panel, do not cause the loss of material, increased the surface area of panel simultaneously, effectively improved the refrigeration efficiency of LaFeSi base magnetism refrigeration board.
(5) The invention adopts stirring friction processing to ensure that the elements of the LaFeSi-based magnetic refrigeration plate are more uniformly distributed, shortens the time required by the subsequent annealing process and improves the production efficiency.
Drawings
FIG. 1 is a process flow diagram of the process of the present invention;
FIG. 2 is a schematic view of the friction stir spot processing of the present invention;
FIG. 3 is a graph comparing tensile properties of the LaFeSi-based magnetic refrigeration sandwich plate material, the LaFeSi-based magnetic refrigeration plate material and the Q235 steel in example 1;
FIG. 4 is a graph comparing impact properties of the LaFeSi-based magnetic refrigeration sandwich plate material, the LaFeSi-based magnetic refrigeration plate material and the Q235 steel in example 1;
fig. 5 is a distribution diagram of elements of the LaFeSi-based magnetic refrigeration panel sheet before and after processing in example 1, wherein (a) (c) (e) is an as-cast LaFeSi-based magnetic refrigeration panel sheet, and (b) (d) (f) is a LaFeSi-based magnetic refrigeration panel sheet after friction stir processing;
fig. 6 is a structural diagram of the LaFeSi-based magnetic refrigeration panel sheet in comparative example 1, in which (a) is an as-cast LaFeSi-based magnetic refrigeration sheet structural diagram, and (b) is a structural diagram of the LaFeSi-based magnetic refrigeration panel sheet obtained after friction stir processing.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The following definitions or conceptual connotations relating to the present invention are provided for illustration:
stirring and rubbing processing: is a novel severe plastic deformation technology. In the processing process, the dynamic recrystallization is carried out on the processing area through the thermoplastic deformation action between the stirring head rotating at high speed and the workpiece, and a uniform equiaxial fine crystalline recrystallization structure is formed.
And (3) processing a stirring friction point: the stirring pin is inserted into a workpiece to be processed in a rotating mode, and a processing area is subjected to severe plastic deformation under the action of the stirring pin to form a keyhole, so that the purpose of increasing the surface area of a plate is achieved.
In the processes of friction stir processing and friction stir point processing, the plate is softened due to higher heat input, so that severe plastic deformation occurs, and the severe plastic deformation processing mode under the high-temperature condition effectively overcomes the defect that the LaFeSi-based magnetic refrigeration plate is subjected to brittle fracture due to the traditional processing methods such as turning, milling, planing, grinding and the like. Meanwhile, in the process of processing the friction stir point, the stirring pin can soften and overflow materials in the hole while preparing the blind hole, and the overflowed materials can be accumulated around the blind hole after being plasticized, so that the surface area of the plate is further increased.
The invention provides a LaFeSi-based magnetic refrigeration sandwich panel, which is characterized in that Q235 steel is used as a core plate, an as-cast LaFeSi magnetic refrigeration panel is used as a panel, the core plate is clamped between an upper panel and a lower panel, and the LaFeSi-based magnetic refrigeration sandwich panel with blind holes is manufactured through friction stir processing and friction stir point processing.
Overflowing materials generated by processing of the friction stir points are accumulated around the blind holes.
The aperture, the number, the spacing and the arrangement mode of the blind holes can be adjusted according to actual needs.
The preparation method of the LaFeSi-based magnetic refrigeration sandwich panel provided by the invention comprises the steps of raw material selection and pretreatment of the LaFeSi-based magnetic refrigeration sandwich panel, raw material selection and design of a processing device and processing parameter setting, and specifically comprises the following steps:
raw material selection and pretreatment: the panel of the LaFeSi-based magnetic refrigeration sandwich plate is an as-cast LaFeSi magnetic refrigeration plate, the width of the plate is 80mm, the length of the plate is 100mm, and the thickness of the plate is 3-5 mm. The core plate is made of Q235 steel, the width of the core plate is 80mm, the length of the core plate is 100mm, and the thickness of the core plate is 3 mm. Before processing, the surfaces of the core plate and the panel are polished by sand paper to ensure that the roughness Ra of the surfaces is less than or equal to 10 mu m, the surfaces of the core plate and the panel after polishing are cleaned by acetone, and oil stains, oxides and impurities on the surfaces are removed and dried.
Setting parameters of friction stir processing: the rotation speed is 475-750 rpm, the advancing speed is 30-47.5 mm/min, the pressing amount is 0.2-0.3 mm, and the pressing speed of the stirring pin is 20 mm/min.
Setting parameters of friction stir point processing: the rotating speed is 750-1100 rpm; the pressing amount of the shaft shoulder is 0, the distance between the shaft shoulder and the surface of the plate is 0.4-0.8 mm, and the pressing speed of the stirring needle is 30 mm/min.
Raw material selection and design of a processing device: the material of the processing device is tungsten-rhenium alloy. The processing device comprises a shaft shoulder and a stirring pin which are sequentially connected, wherein the shaft shoulder is cylindrical, and the diameter of the shaft shoulder is 10-18 mm; the stirring pin is cylindrical and conical, the diameter of the cylindrical stirring pin is 3-6 mm, and the length of the cylindrical stirring pin is 3.2-5.4 mm; the diameter of the root of the conical stirring needle is 4-8 mm, and the length of the conical stirring needle is 5.2-5.4 mm.
With reference to the process flow diagram of fig. 1, the specific scheme of the present invention is as follows:
firstly, carrying out multi-pass friction stir processing on the interface of a panel plate and a core material of the LaFeSi-based magnetic refrigeration sandwich plate; then, processing friction stir points on the surface of the panel board to generate blind holes on the surface of the board; the average aperture of the cylindrical blind holes is 3-6 mm; the average aperture of the conical blind holes is 4-8 mm.
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Example 1:
in this embodiment, a LaFeSi-based magnetic refrigeration sheet is used as a panel sheet, and Q235 steel is used as a core plate to prepare a LaFeSi-based magnetic refrigeration sandwich sheet. The method comprises the following specific steps:
raw material selection and pretreatment: the panel plate of the LaFeSi-based magnetic refrigeration sandwich plate is an as-cast LaFeSi magnetic refrigeration plate, the width of the panel plate is 80mm, the length of the panel plate is 100mm, and the thickness of the panel plate is 5 mm. The core plate is made of Q235 steel, the width of the core plate is 80mm, the length of the core plate is 100mm, and the thickness of the core plate is 3 mm. Before processing, the surfaces of the core plate and the panel are polished by sand paper to ensure that the roughness Ra of the surface of the panel is less than or equal to 10 mu m, the surfaces of the core plate and the panel after polishing are cleaned by acetone, and oil stains, oxides and impurities on the surfaces are removed and dried.
Raw material selection and design of a processing device: the stirring head is made of tungsten-rhenium alloy and comprises a shaft shoulder and a stirring needle, wherein the shaft shoulder is cylindrical, the diameter of the shaft shoulder is 18mm, the stirring needle is cylindrical, the diameter of the stirring needle is 8mm, and the length of the stirring needle is 5.2 mm. The shaft shoulder of friction stir point processing is cylindrical, and shaft shoulder diameter 10mm, the stirring pin is conical, and the root diameter of stirring pin is 6mm, and the top diameter is 3mm, and the needle length is 5.4 mm.
Setting parameters of friction stir processing: the rotational speed of the friction stir processing is 750rpm, the advancing speed is 35mm/min, the reduction of the shaft shoulder is 0.2mm, the reduction speed of the stirring pin is 20mm/min, and the pass offset is 10 mm.
Setting parameters of friction stir point processing: the rotating speed is 750rpm, the reduction of the shaft shoulder is 0, the distance between the shaft shoulder and the plate surface is 0.4mm, the reduction speed of the stirring pin is 30mm/min, and the spacing between blind holes is 12 mm.
The specific scheme is as follows:
the preparation steps are shown in figure 1: placing the cleaned panel on a core plate, and clamping the panel on a workbench by using a clamp; carrying out multi-pass S-shaped or spiral stirring friction processing on the surface of the panel plate; integrally turning over the processed panel plate and the core plate, placing a panel plate with the same specification on the integrally turned-over Q235 plate, performing multi-pass friction stir processing again, wherein the distance between adjacent passes in the multi-pass friction stir processing route is 10mm, and then manufacturing blind holes in the same position of the upper and lower panels by adopting a friction stir point processing mode (the friction stir point processing schematic diagram is shown in figure 2) to obtain the LaFeSi-based magnetic refrigeration sandwich plate.
And (4) conclusion: example 1 successfully achieved a process for the preparation of a LaFeSi-based magnetic refrigeration sandwich panel. Because a large number of conical blind holes exist on the surface, compared with the method before the friction stir point processing, the surface area of the refrigeration sandwich plate is increased by 64 percent, thereby improving the refrigeration efficiency. As can be seen from FIG. 3, the tensile strength of the LaFeSi-based magnetic refrigeration sandwich plate material is 203MPa, which is between that of the LaFeSi-based magnetic refrigeration plate material (15MPa) and that of Q235 steel (423 MPa). As can be seen from fig. 4, the impact energy of the LaFeSi-based magnetic refrigeration sandwich plate is 99J, which is between the LaFeSi-based magnetic refrigeration plate (2J) and the Q235 steel (216J), and as can be seen from fig. 5, the distribution of the elements inside the crystal grains and the grain boundary of the as-cast LaFeSi-based magnetic refrigeration plate is not uniform, and the distribution of the La/Fe/Si elements in the LaFeSi-based magnetic panel plate after friction stir processing is obviously uniform, which is beneficial to shortening the subsequent annealing time, thereby improving the production efficiency.
Example 2:
in this embodiment, a LaFeSi-based magnetic refrigeration sheet is used as a panel sheet, and Q235 steel is used as a core sheet to prepare a LaFeSi-based magnetic refrigeration sandwich sheet. The method comprises the following specific steps:
raw material selection and pretreatment: the same as example 1, except that the thickness of the LaFeSi-based magnetic refrigeration sandwich plate material is 3 mm.
Selecting a stirring head: the stirring head material is tungsten rhenium alloy, including shaft shoulder and stirring needle, the shaft shoulder is cylindrical, and the shaft shoulder diameter is 10mm, and the stirring needle is cylindrical, and the diameter is 4mm, and length is 3.2 mm. The diameter of the shaft shoulder for processing the friction stir points is 10mm, the diameter of the cylindrical stirring needle is 4mm, and the length of the stirring needle is 3.4 mm.
Setting parameters of friction stir processing: the rotating speed is 475rpm, the advancing speed is 30mm/min, the shaft shoulder pressing amount is 0.2mm, the stirring pin pressing speed is 20mm/min, and the pass offset is 6 mm.
Setting parameters of friction stir point processing: the rotating speed is 1100rpm, the reduction of the shaft shoulder is 0, the distance between the shaft shoulder and the plate surface is 0.8mm, the pressing speed of the stirring pin is 30mm/min, and the spacing between blind holes is 20 mm.
The specific scheme is as follows:
the preparation procedure was the same as in example 1.
And (4) conclusion: embodiment 2 successfully realizes a preparation process of a LaFeSi-based magnetic refrigeration sandwich plate, and cylindrical blind holes are generated on the surface of the sandwich plate after the stir friction point processing, so that the surface area is increased by 40%. As shown in Table 1, the tensile strength of the LaFeSi-based magnetic refrigeration sandwich plate material is 245MPa, and the impact performance is 160J. The results show that the method can successfully prepare the LaFeSi-based magnetic refrigeration sandwich plate with high strength and high refrigeration efficiency.
Example 3:
in the embodiment, the LaFeSi-based magnetic refrigeration sheet material is used as a panel sheet material, and Q235 steel is used as a core sheet material to prepare the LaFeSi-based magnetic refrigeration sandwich sheet material. The method comprises the following specific steps:
raw material selection and pretreatment: the same as example 1, except that the thickness of the LaFeSi-based magnetic refrigeration sandwich plate material is 3 mm.
Selecting a stirring head: the stirring head is made of tungsten-rhenium alloy and comprises a shaft shoulder and a stirring needle, the diameter of the shaft shoulder for friction stir processing is 10mm, the stirring needle is cylindrical, the diameter of the stirring needle is 4mm, and the length of the stirring needle is 3.2 mm. The diameter of a shaft shoulder processed by the friction stir point is 10mm, the diameter of a cylindrical stirring needle is 4mm, and the length of the needle is 3.4 mm.
Setting parameters of friction stir processing: the rotating speed is 600rpm, the advancing speed is 40mm/min, the reduction of the shaft shoulder is 0.2mm, the reduction speed of the stirring pin is 20mm/min, and the pass offset is 6 mm.
Setting parameters of friction stir point processing: the rotating speed is 1000rpm, the pressing amount of the shaft shoulder is 0, the distance between the shaft shoulder and the plate surface is 0.6mm, the pressing speed of the stirring pin is 30mm/min, and the spacing between blind holes is 30 mm.
The specific scheme is as follows:
the preparation method comprises the following steps: the preparation procedure was the same as in example 1.
And (4) conclusion: embodiment 3 successfully realizes a preparation process of a LaFeSi-based magnetic refrigeration sandwich plate, and cylindrical blind holes are generated on the surface of the sandwich plate after the stir friction point processing, so that the surface area of the plate is increased by 24%. As shown in Table 1, the tensile strength of the LaFeSi-based magnetic refrigeration sandwich plate material is 260MPa, and the impact property is 183J. The results show that the method can successfully prepare the LaFeSi-based magnetic refrigeration sandwich plate with high strength and high refrigeration efficiency.
Table 1 shows comparative data of tensile properties, impact properties and surface area increasing rates of the raw LaFeSi-based magnetic refrigeration sheet and the LaFeSi-based magnetic refrigeration sandwich sheets prepared in examples 1 to 3. From table 1, it can be seen that the tensile strength, impact property and refrigeration efficiency of the LaFeSi-based magnetic refrigeration sandwich plate prepared by the method are obviously improved.
TABLE 1 statistical table of tensile properties, impact properties and surface area increasing rates of LaFeSi-based magnetic refrigeration sheet before and after processing
| Name (R) | Tensile strength (MPa) | Impact Property (J) | Surface area increase rate (%) |
| |
15 | 2 | 0 |
| Example 1 | 203 | 99 | 64 |
| Example 2 | 245 | 160 | 40 |
| Example 3 | 260 | 183 | 24 |
Comparative example 1
The LaFeSi-based magnetic refrigeration plate is prepared by adopting an electric arc melting method.
The method comprises the following specific steps: firstly, calculating the mass of each simple substance with nominal components required by the LaFeSi-based magnetic refrigeration plate according to the stoichiometric ratio, repeatedly smelting the prepared magnet in an electric arc smelting furnace for 5-6 times to ensure the components to be uniform, and cooling and solidifying to obtain the as-cast LaFeSi-based magnetic refrigeration plate.
FIG. 6(a) is a structural morphology diagram of an as-cast LaFeSi-based magnetic refrigeration sheet prepared by an arc melting method, and it can be seen that the as-cast LaFeSi-based magnetic refrigeration sheet has a coarse structure and a hole defect inside; and (b) a structural morphology diagram of the LaFeSi-based magnetic refrigeration sandwich plate processed by stirring friction, and the structural refinement, densification and homogenization of the LaFeSi-based magnetic refrigeration plate processed by stirring friction can be seen.
Comparing example 1 with comparative example 1, it can be found that the structure and mechanical properties of the LaFeSi-based magnetic refrigeration sheet material prepared by the invention are obviously improved, the surface area is increased, and the magnetic refrigeration efficiency is improved.
Experimental results show that blind holes are prepared on the panel board through friction stir point processing, the surface area is increased, and the refrigeration efficiency of the LaFeSi-based magnetic board is improved. In the friction stir point processing process, the plate is softened due to the input of higher heat, the stirring pin can overflow materials in the hole while preparing the blind hole, and the overflowing plate is extruded to be plasticized around the blind hole along with the high-speed rotation of the stirring pin, so that the overflowing plate is attached to the surface of the plate, the material waste is not caused, the surface area of the material is increased, and the refrigeration efficiency is improved. Compared with the traditional processing methods of turning, milling, planing, grinding and the like, which are easy to generate brittle fracture, low in processability and even incapable of processing and forming in the process of preparing the LaFeSi-based magnetic refrigeration plate, so that waste of materials in holes is caused, and the refrigeration efficiency is reduced, the LaFeSi-based magnetic refrigeration sandwich plate prepared by the friction stir processing and friction stir point processing modes has the advantages of compact structure, uniform element distribution, higher strength, increased surface area and high refrigeration efficiency. The annealing time of the subsequent LaFeSi-based magnetic refrigeration sandwich plate is shortened, and the production efficiency is improved.
The above-mentioned embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the scope of the invention, and therefore all equivalent variations made by the following claims should be included in the scope of the invention.
Claims (7)
1. The LaFeSi-based magnetic refrigeration sandwich plate is characterized in that the LaFeSi-based magnetic refrigeration sandwich plate takes Q235 steel as a core plate and an as-cast LaFeSi-based magnetic refrigeration plate as a panel, the core plate is clamped between an upper panel and a lower panel, and the LaFeSi-based magnetic refrigeration sandwich plate with blind holes is manufactured through friction stir processing and friction stir point processing.
2. The LaFeSi-based magnetic refrigeration sandwich plate material as claimed in claim 1, wherein overflow materials generated by friction stir point processing are accumulated around the blind holes.
3. A method for preparing LaFeSi-based magnetic refrigeration sandwich panel, characterized in that, the method for preparing adopts the LaFeSi-based magnetic refrigeration sandwich panel of claim 1, firstly, the interface of the panel plate and the core plate of the LaFeSi-based magnetic refrigeration sandwich panel is processed by multi-pass friction stir; then, carrying out friction stir point processing on the surface of the panel plate to generate a blind hole on the surface of the plate; and finally, accumulating overflowing materials generated by the friction stir point processing on the surface of the panel around the blind hole.
4. The method for preparing the LaFeSi-based magnetic refrigeration sandwich plate material as claimed in claim 2, wherein the parameters of the multi-pass friction stir processing are as follows: the rotation speed is 475-750 rpm, the advancing speed is 30-47.5 mm/min, the pressing amount is 0.2-0.3 mm, and the pressing speed of the stirring pin is 20 mm/min.
5. The method for preparing LaFeSi-based magnetic refrigeration sandwich plate material according to claim 2, wherein the friction stir point processing parameters are as follows: the rotating speed is 750-1100 rpm; the pressing amount of the shaft shoulder is 0, the distance between the shaft shoulder and the surface of the plate is 0.4-0.8 mm, and the pressing speed of the stirring needle is 30 mm/min.
6. A processing device of a LaFeSi-based magnetic refrigeration sandwich panel is characterized in that the processing device realizes the preparation method of the LaFeSi-based magnetic refrigeration sandwich panel according to claims 2-5, and comprises a shaft shoulder and a stirring pin which are sequentially connected, wherein the shaft shoulder is cylindrical, and the diameter of the shaft shoulder is 10-18 mm;
the stirring pin is cylindrical and conical, the diameter of the cylindrical stirring pin is 3-6 mm, and the length of the cylindrical stirring pin is 3.2-5.4 mm; the root diameter of the conical stirring needle is 4-8 mm, and the length of the conical stirring needle is 5.2-5.4 mm.
7. The processing device for preparing the LaFeSi-based magnetic refrigeration sandwich plate by stirring friction processing according to claim 6, wherein the material of the processing device is tungsten-rhenium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010817245.9A CN111907147B (en) | 2020-08-14 | 2020-08-14 | LaFeSi-based magnetic refrigeration sandwich plate, preparation method and processing device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010817245.9A CN111907147B (en) | 2020-08-14 | 2020-08-14 | LaFeSi-based magnetic refrigeration sandwich plate, preparation method and processing device thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111907147A true CN111907147A (en) | 2020-11-10 |
| CN111907147B CN111907147B (en) | 2022-10-11 |
Family
ID=73284615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010817245.9A Active CN111907147B (en) | 2020-08-14 | 2020-08-14 | LaFeSi-based magnetic refrigeration sandwich plate, preparation method and processing device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111907147B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112885549A (en) * | 2021-01-08 | 2021-06-01 | 哈尔滨工业大学 | Preparation method of magnetic phase change material of regenerator of magnetic refrigerator and magnetic refrigeration circulating system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286434A (en) * | 2013-05-30 | 2013-09-11 | 南京理工大学 | Method for manufacturing high-strength laminated composite boards |
| CN103468226A (en) * | 2013-08-27 | 2013-12-25 | 中国科学院理化技术研究所 | Lanthanum-iron-silicon-based room-temperature magnetic refrigeration composite material and preparation method thereof |
| CN106906408A (en) * | 2015-12-22 | 2017-06-30 | 中国科学院宁波材料技术与工程研究所 | LaFeSi base magnetic refrigeration composite materials and preparation method and application |
| CN108242302A (en) * | 2018-01-05 | 2018-07-03 | 华南理工大学 | A kind of LaFeSi bases magnetic refrigeration composite block material based on grain boundary decision technology and preparation method thereof |
| CN109500485A (en) * | 2018-10-15 | 2019-03-22 | 西安建筑科技大学 | A kind of metal foamed aluminium sandwich material, processing method and processing unit (plant) |
| CN109570631A (en) * | 2018-12-21 | 2019-04-05 | 西安建筑科技大学 | A kind of mixing yoghurt prepares the method and its processing unit (plant) of porous metal material |
-
2020
- 2020-08-14 CN CN202010817245.9A patent/CN111907147B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286434A (en) * | 2013-05-30 | 2013-09-11 | 南京理工大学 | Method for manufacturing high-strength laminated composite boards |
| CN103468226A (en) * | 2013-08-27 | 2013-12-25 | 中国科学院理化技术研究所 | Lanthanum-iron-silicon-based room-temperature magnetic refrigeration composite material and preparation method thereof |
| CN106906408A (en) * | 2015-12-22 | 2017-06-30 | 中国科学院宁波材料技术与工程研究所 | LaFeSi base magnetic refrigeration composite materials and preparation method and application |
| CN108242302A (en) * | 2018-01-05 | 2018-07-03 | 华南理工大学 | A kind of LaFeSi bases magnetic refrigeration composite block material based on grain boundary decision technology and preparation method thereof |
| CN109500485A (en) * | 2018-10-15 | 2019-03-22 | 西安建筑科技大学 | A kind of metal foamed aluminium sandwich material, processing method and processing unit (plant) |
| CN109570631A (en) * | 2018-12-21 | 2019-04-05 | 西安建筑科技大学 | A kind of mixing yoghurt prepares the method and its processing unit (plant) of porous metal material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112885549A (en) * | 2021-01-08 | 2021-06-01 | 哈尔滨工业大学 | Preparation method of magnetic phase change material of regenerator of magnetic refrigerator and magnetic refrigeration circulating system |
| CN112885549B (en) * | 2021-01-08 | 2022-09-20 | 哈尔滨工业大学 | Preparation method of magnetic phase change material of regenerator of magnetic refrigerator and magnetic refrigeration circulating system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111907147B (en) | 2022-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105252435B (en) | A kind of devitrified glass ceramics bond and preparation method thereof, SG grinding wheels and preparation method thereof | |
| US20110130294A1 (en) | Method of manufacturing superconducting radio-frequency acceleration cavity | |
| CN111907147B (en) | LaFeSi-based magnetic refrigeration sandwich plate, preparation method and processing device thereof | |
| CN109972000A (en) | A kind of heat exchanger composite strip and preparation method thereof | |
| CN104438536A (en) | Ultrasound spinning forming technique for magnesium alloy cylinders | |
| CN102888540A (en) | Aluminum foil for air conditioner having high heat exchange efficiency and manufacturing method thereof | |
| CN1318112A (en) | Sputtering target | |
| CN114682800A (en) | Method for manufacturing eutectic high-entropy alloy plate by ultrasonic rolling surface strengthening laser additive | |
| CN114571058A (en) | Solid additive manufacturing method of large-size block ultra-fine grain metal material | |
| CN110684937A (en) | Preparation method of layered double-scale magnesium alloy | |
| CN102220527B (en) | Method for improving damping performance of extruded Mg-Cu-Mn series alloy | |
| CN114085969B (en) | Preparation process of high-entropy alloy plate with heterogeneous laminated structure | |
| CN110306132B (en) | Plastic processing method for improving comprehensive mechanical property of 2A14 aluminum alloy plate | |
| CN101713057B (en) | Process used for spray forming Si-Al alloy solid-liquid two-phase region hot working molding encapsulating parts | |
| CN114535519A (en) | Method for controlling size of sintered neodymium iron boron grains | |
| CN104607464B (en) | A kind of milling method of high temperature insulating screen wide cut ultra-thin molybdenum plate band | |
| CN112281063A (en) | Preparation method of steel plate for forklift manufacturing | |
| CN110076210A (en) | A kind of preparation method of relay high-fire resistance copper strips | |
| CN108747857A (en) | A kind of processing does not quench high linear speed self-sharpening CBN grinding wheels of alloyed steel work-piece and preparation method thereof | |
| CN217192846U (en) | Inner-cooling numerical control cutter body manufactured by laser metal additive manufacturing process | |
| CN113355667B (en) | Method for repairing microcracks on surface of nickel-based superalloy forging die | |
| CN113913811B (en) | Alloy powder for semiconductor laser cladding, preparation method and cladding process thereof | |
| CN113718093B (en) | High-speed impact large-area preparation of amorphous/nanocrystalline composite coating and preparation process thereof | |
| JP3823548B2 (en) | Electrical steel sheet with excellent machinability and magnetic properties | |
| CN113245558B (en) | Method for manufacturing high-performance high-temperature gradient material component |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |