A composite material for 430 stainless steel insulating paste and a preparation method thereof

Abstract

This invention relates to the field of thick film slurry insulation technology, specifically to a composite material for insulating slurry of 430 stainless steel and its preparation method. The raw materials include glass frit and inorganic fillers; by weight, the raw materials for preparing the glass frit include: 60-90 parts BaSO4, 5-18 parts ZrO2, 5-8 parts MgO, 2-3 parts CaO, 5-11 parts SiO2, 5-9 parts H3BO3, 2-4 parts TiO2, 0-2 parts K2CO3, 0-3 parts Li2CO3, and 3-5 parts Al2O3; the mass ratio of the glass frit to the inorganic filler is (90-95):(5-10); the inorganic filler includes one or more of MgO, TiO2, and ZrO2. This invention first prepares a low-melting-point, high-voltage resistant glass frit, solving the safety hazards such as substrate warping, cracking, and even detachment during the sintering of insulating layers on large substrates, and the relatively poor voltage resistance.

Description

Technical Field

[0001] This invention relates to the field of thick film slurry insulation technology, specifically to a composite material for 430 stainless steel insulating slurry and its preparation method. Background Technology

[0002] Thick-film heaters utilize heating plates to convert electrical energy into heat energy, characterized by high power density and rapid heating. To ensure safe and efficient operation, the insulation layer required for this heater must possess excellent high-voltage and electrical breakdown resistance. Furthermore, an insulation layer must be placed between the thick-film heater and the stainless steel substrate. This insulation layer must not only have a similar coefficient of thermal expansion to the substrate to ensure good adhesion, but also be able to withstand multiple sintering processes without losing its performance.

[0003] With technological advancements, thick-film heaters are increasingly diverse in shape, such as irregularly shaped tubular designs. This necessitates that the insulating layer formed by the insulating dielectric slurry possess excellent bending resistance; otherwise, the product's durability will be directly affected. Particularly in the new energy vehicle sector, thick-film heaters are widely used for battery pack heating to meet the demands of cold environments. Due to the large size of these thick-film heaters, the 430 stainless steel insulation layer and the 430 substrate must have a matching coefficient of thermal expansion. Otherwise, the substrate is prone to warping, cracking, or even detachment during use, potentially leading to a decrease in withstand voltage and causing safety hazards such as leakage and fire.

[0004] Chinese patent CN101805125B discloses an insulating glass dielectric slurry for 430 stainless steel and its preparation method. The raw materials include 30-80 parts of BaCO3; 0-10 parts of Al2O3; 0-10 parts of CaCO3; 40-50 parts of SiO2; 0-5 parts of H3BO3; and 5-10 parts of TiO2. Although this invention solves the problem of mismatch between the thermal expansion coefficients of the insulating glass dielectric slurry and the metal substrate, its pressure resistance still needs to be improved in actual use, and substrate warping is prone to occur. Summary of the Invention

[0005] To address the problems in the prior art, the first aspect of this invention provides a composite material for insulating grout of 430 stainless steel, the raw materials for which preparation includes glass frit and inorganic filler; by weight, the raw materials for preparing the glass frit include:

[0006] 50-90 parts BaSO4, 0-20 parts ZrO2, 3-9 parts MgO, 2-5 parts CaO, 4-26 parts SiO2, 5-10 parts H3BO3, 0-5 parts TiO2, 0-2 parts K2CO3, 0-3 parts Li2CO3, 1-5 parts Al2O3.

[0007] In one embodiment, the raw materials for preparing the glass frit, by weight, include:

[0008] 60-90 parts BaSO4, 5-18 parts ZrO2, 5-8 parts MgO, 2-3 parts CaO, 5-11 parts SiO2, 5-9 parts H3BO3, 2-4 parts TiO2, 0-2 parts K2CO3, 0-3 parts Li2CO3, 3-5 parts Al2O3.

[0009] In one embodiment, the mass ratio of the glass frit to the inorganic filler is (90-100):(0-10), excluding endpoint values.

[0010] In a preferred embodiment, the mass ratio of the glass frit to the inorganic filler is (90-95):(5-10). Examples include 92:5, 92:8, 92:9, 95:5, 95:6, 95:8, and 95:9.

[0011] In this invention, SiO2 and B2O3 are used as the basic materials for glass formation. Suitable melting temperature, sintering temperature, and thermal expansion coefficient characteristics are obtained by adding substances such as BaO, MgO, CaO, TiO2, ZrO2, Li2CO3, Li2CO3, and Al2O3 to the raw materials to adjust the fused mass. Simultaneously, the inventors discovered that when the mass ratio of glass fused mass to inorganic filler in the system is (90-95):(5-10), the prepared composite material exhibits strong compressive strength and significantly reduces warpage. This may be because within this mass ratio range, the inorganic filler can be uniformly distributed in the middle of the glass fused mass, reducing the occurrence of pinholes and bubbles in the insulating layer, further improving the density and electrical strength of the insulating layer.

[0012] In one embodiment, the inorganic filler includes one or more of MgO, TiO2, and ZrO2. The MgO, TiO2, and ZrO2 are all analytical grade raw materials from Shanghai Mairui Chemical Technology Co., Ltd.

[0013] In one embodiment, the inorganic filler is ZrO2.

[0014] In one embodiment, the inorganic filler is TiO2 and ZrO2.

[0015] In a preferred embodiment, the mass ratio of TiO2 to ZrO2 is 3:7.

[0016] In one embodiment, the average particle size D50 of both MgO and TiO2 is <10 μm.

[0017] In one embodiment, the average particle size D50 of the ZrO2 is < 20 μm.

[0018] In one embodiment, the average particle size D50 of the composite material is 2-4 μm. Examples include 2 μm, 3 μm, and 4 μm.

[0019] A second aspect of the present invention provides a method for preparing a composite material for insulating grout of 430 stainless steel, comprising at least the following steps:

[0020] S1. Preparation of glass frit;

[0021] S2. The glass frit and inorganic filler are ball-milled in a ball mill for 5-6 hours and then sieved to obtain the final product.

[0022] In one embodiment, the screen is a 400-mesh screen.

[0023] In one embodiment, the method for preparing the glass frit includes:

[0024] The raw materials for preparing glass frit are placed in a mixer and mixed for 100-150 minutes. The material is then placed in a crucible and heated to 1500-1800℃ in a high-temperature furnace. After the material is melted evenly, it is poured into a water quenching tank to cool. The material is then removed, drained, and dried at 100-120℃ for 2-3 hours to obtain the final product.

[0025] In a preferred embodiment, the method for preparing the glass frit includes:

[0026] The raw materials for preparing glass frit are placed in a mixer and mixed for 120 minutes. The material is then placed in a crucible and heated to 1600°C in a high-temperature furnace. After the material is melted evenly, it is poured into a water quenching tank to cool. The material is then removed, drained, and dried at 110°C for 2 hours to obtain the final product.

[0027] Beneficial effects

[0028] 1. This invention provides a composite material for 430 stainless steel insulating slurry and its preparation method. Currently, the glass powder used in 430 stainless steel insulating slurry has a relatively small coefficient of expansion. This invention solves the safety hazards such as substrate warping, cracking, or even falling off when sintering the insulating layer on a large substrate, and the relatively poor pressure resistance.

[0029] 2. The present invention first prepares a low-melting-point high-voltage resistant glass frit, and then mixes the glass frit and inorganic filler in a specific mass ratio evenly and crushes them to obtain a composite material for 430 stainless steel insulating slurry. The insulating slurry prepared by the composite material has a voltage resistance value of over 2500 V / 80μm, and the substrate warpage is significantly reduced.

[0030] 3. The preparation method of the composite material for 430 stainless steel insulating grout provided by the present invention has a simple preparation process and good market application value. Attached Figure Description

[0031] Figure 1 The figures show the actual images of the insulating slurry and electrodes prepared for each embodiment and comparative example after sintering; in the figures, 1# is comparative example 1, 2# is comparative example 2, 3# is comparative example 3, 4# is example 1, 5# is example 2, 6# is example 3, 7# is example 4, 8# is comparative example 4, 9# is comparative example 6, 10# is comparative example 5, 11# is example 5, and 12# is example 6.

[0032] Figure 2 Images show the insulating slurry prepared for Comparative Examples 1 and 2, and the sintered thickness of the electrodes after sintering; in the images, a represents Comparative Example 1, and b represents Comparative Example 2.

[0033] Figure 3 Images show the insulating slurry prepared for Comparative Example 3 and Example 1, and the sintering thickness of the electrodes after sintering; in the images, c represents Comparative Example 3, and d represents Example 1.

[0034] Figure 4 Images show the insulating slurry prepared in Examples 2 and 3, and the sintering thickness of the electrodes after sintering; in the images, e represents Example 2, and f represents Example 3.

[0035] Figure 5 Images show the insulating slurry prepared in Example 4 and Comparative Example 4, and the sintering thickness of the electrodes after sintering; in the images, g represents Example 4 and h represents Comparative Example 4.

[0036] Figure 6 Images show the insulating slurry prepared for Comparative Examples 5 and 6, and the sintered thickness of the electrodes after sintering; in the images, i represents Comparative Example 6, and j represents Comparative Example 5.

[0037] Figure 7 Images show the insulating slurry prepared in Examples 5 and 6, and the sintered thickness of the electrodes after sintering; in the images, k represents Example 5, and l represents Example 6. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Experimental methods not specifying specific conditions in the embodiments were performed under conventional conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0039] All raw materials used in this invention were purchased from Shanghai Mairui Biochemical Technology Co., Ltd.; among them, BaSO4, production number MKL-B802889; BaCO3, 99%, production number M18200; ZrO2, production number M90291; MgO, production number M85640; CaO, production number M04648; SiO2, production number MKL-S824278; H3BO3, production number M00259; TiO2, production number M05516; K2CO3, production number N08683; Li2CO3, production number M19611; Al2O3, production number M05516, production number M05398.

[0040] Example 1

[0041] The first aspect of this embodiment provides a composite material for insulating grout of 430 stainless steel, the raw materials for which preparation includes glass frit and inorganic filler; by weight, the raw materials for preparing the glass frit include:

[0042] 76.27 parts BaSO4, 18 parts ZrO2, 8 parts MgO, 3 parts CaO, 7.5 parts SiO2, 5.32 parts H3BO3, 4 parts TiO2, and 5 parts Al2O3.

[0043] The mass ratio of the glass frit to the inorganic filler is 95:5.

[0044] The inorganic filler is ZrO2. The average particle size D50 of the ZrO2 is 5 μm.

[0045] The average particle size D50 of the composite material is 4 μm.

[0046] The second aspect of this embodiment provides a method for preparing a composite material for insulating grout of 430 stainless steel, comprising the following steps:

[0047] S1. Preparation of glass frit: The raw materials for preparing glass frit are placed in a mixer and mixed for 120 minutes. The materials are then placed in a crucible and heated to 1600°C in a high-temperature furnace. After the materials are melted evenly, they are poured into a water quenching tank to cool. The materials are then removed, drained, and dried at 110°C for 2 hours to obtain the glass frit.

[0048] S2. The glass frit and inorganic filler are ball-milled in a ball mill for 5 hours and then passed through a 400-mesh sieve to obtain the final product.

[0049] Example 2

[0050] The first aspect of this embodiment provides a composite material for insulating grout of 430 stainless steel, the raw materials for which preparation includes glass frit and inorganic filler; by weight, the raw materials for preparing the glass frit include:

[0051] 76.27 parts BaSO4, 18 parts ZrO2, 8 parts MgO, 3 parts CaO, 7.5 parts SiO2, 5.32 parts H3BO3, 4 parts TiO2, and 5 parts Al2O3.

[0052] The mass ratio of the glass frit to the inorganic filler is 95:5.

[0053] The inorganic filler is TiO2 and ZrO2. The mass ratio of TiO2 to ZrO2 is 3:7, the average particle size D50 of ZrO2 is 5 μm, and the average particle size D50 of TiO2 is 2 μm.

[0054] The average particle size D50 of the composite material is 4 μm.

[0055] The second aspect of this embodiment provides a method for preparing a composite material for insulating grout of 430 stainless steel, comprising the following steps:

[0056] S1. Preparation of glass frit: The raw materials for preparing glass frit are placed in a mixer and mixed for 120 minutes. The materials are then placed in a crucible and heated to 1600°C in a high-temperature furnace. After the materials are melted evenly, they are poured into a water quenching tank to cool. The materials are then removed, drained, and dried at 110°C for 2 hours to obtain the glass frit.

[0057] S2. The glass frit and inorganic filler are ball-milled in a ball mill for 5 hours and then passed through a 400-mesh sieve to obtain the final product.

[0058] Example 3

[0059] The first aspect of this embodiment provides a composite material for insulating grout of 430 stainless steel, the raw materials for which preparation includes glass frit and inorganic filler; by weight, the raw materials for preparing the glass frit include:

[0060] 64.07 parts BaSO4, 6 parts ZrO2, 5 parts MgO, 3 parts CaO, 11 parts SiO2, 5.32 parts H3BO3, 2.5 parts TiO2, 3 parts Al2O3, 1.43 parts K2CO3, 2.55 parts Li2CO3.

[0061] The mass ratio of the glass frit to the inorganic filler is 95:5.

[0062] The inorganic filler is ZrO2. The average particle size D50 of the ZrO2 is 5 μm.

[0063] The average particle size D50 of the composite material is 4 μm.

[0064] The second aspect of this embodiment provides a method for preparing a composite material for insulating grout of 430 stainless steel, comprising the following steps:

[0065] S1. Preparation of glass frit: The raw materials for preparing glass frit are placed in a mixer and mixed for 120 minutes. The materials are then placed in a crucible and heated to 1600°C in a high-temperature furnace. After the materials are melted evenly, they are poured into a water quenching tank to cool. The materials are then removed, drained, and dried at 110°C for 2 hours to obtain the glass frit.

[0066] S2. The glass frit and inorganic filler are ball-milled in a ball mill for 5 hours and then passed through a 400-mesh sieve to obtain the final product.

[0067] Example 4

[0068] The first aspect of this embodiment provides a composite material for insulating grout of 430 stainless steel, the raw materials for which preparation includes glass frit and inorganic filler; by weight, the raw materials for preparing the glass frit include:

[0069] 64.07 parts BaSO4, 6 parts ZrO2, 5 parts MgO, 3 parts CaO, 11 parts SiO2, 5.32 parts H3BO3, 2.5 parts TiO2, 3 parts Al2O3, 1.43 parts K2CO3, 2.55 parts Li2CO3.

[0070] The mass ratio of the glass frit to the inorganic filler is 95:5.

[0071] The inorganic filler is TiO2 and ZrO2. The mass ratio of TiO2 to ZrO2 is 3:7.

[0072] The average particle size D50 of ZrO2 is 5 μm, and the average particle size D50 of TiO2 is 2 μm.

[0073] The average particle size D50 of the composite material is 4 μm.

[0074] The second aspect of this embodiment provides a method for preparing a composite material for insulating grout of 430 stainless steel, comprising the following steps:

[0075] S1. Preparation of glass frit: The raw materials for preparing glass frit are placed in a mixer and mixed for 120 minutes. The materials are then placed in a crucible and heated to 1600°C in a high-temperature furnace. After the materials are melted evenly, they are poured into a water quenching tank to cool. The materials are then removed, drained, and dried at 110°C for 2 hours to obtain the glass frit.

[0076] S2. The glass frit and inorganic filler are ball-milled in a ball mill for 5 hours and then passed through a 400-mesh sieve to obtain the final product.

[0077] Example 5

[0078] The specific implementation method of this embodiment is the same as that of Embodiment 1, except that, by weight, the raw materials for preparing the glass frit include:

[0079] 60 parts BaSO4, 5 parts ZrO2, 5 parts MgO, 2 parts CaO, 5 parts SiO2, 5 parts H3BO3, 2 parts TiO2, and 3 parts Al2O3.

[0080] Example 6

[0081] The specific implementation method of this embodiment is the same as that of Embodiment 1, except that, by weight, the raw materials for preparing the glass frit include:

[0082] 90 parts BaSO4, 18 parts ZrO2, 8 parts MgO, 3 parts CaO, 11 parts SiO2, 9 parts H3BO3, 4 parts TiO2, 5 parts Al2O3, 2 parts K2CO3, and 3 parts Li2CO3.

[0083] Comparative Example 1

[0084] The specific implementation method of this comparative example is the same as that of Example 1, except that the raw material for preparing the composite material for 430 stainless steel insulating slurry in this comparative example is only glass frit. The raw material for preparing the glass frit is the same as that in Example 1.

[0085] The second aspect of this comparative example provides a method for preparing a composite material for insulating grout of 430 stainless steel, comprising the following steps:

[0086] S1. Preparation of glass frit: The raw materials for preparing glass frit are placed in a mixer and mixed for 120 minutes. The materials are then placed in a crucible and heated to 1600°C in a high-temperature furnace. After the materials are melted evenly, they are poured into a water quenching tank to cool. The materials are then removed, drained, and dried at 110°C for 2 hours to obtain the glass frit.

[0087] S2. The glass frit is ball-milled in a ball mill for 5 hours and then passed through a 400-mesh sieve to obtain the glass frit.

[0088] Comparative Example 2

[0089] The specific implementation method of this comparative example is the same as that of Example 3, except that the raw material for preparing the composite material for 430 stainless steel insulating slurry in this comparative example is only glass frit. The raw material for preparing the glass frit is the same as that in Example 3.

[0090] The second aspect of this comparative example provides a method for preparing a composite material for insulating grout of 430 stainless steel, comprising the following steps:

[0091] S1. Preparation of glass frit: The raw materials for preparing glass frit are placed in a mixer and mixed for 120 minutes. The materials are then placed in a crucible and heated to 1600°C in a high-temperature furnace. After the materials are melted evenly, they are poured into a water quenching tank to cool. The materials are then removed, drained, and dried at 110°C for 2 hours to obtain the glass frit.

[0092] S2. The glass frit is ball-milled in a ball mill for 5 hours and then passed through a 400-mesh sieve to obtain the glass frit.

[0093] Comparative Example 3

[0094] The specific implementation method of this comparative example is the same as that of Comparative Example 2, except that the raw materials for preparing the glass frit in this comparative example include:

[0095] 85.42 parts BaSO4, 12.6 parts ZrO2, 5.6 parts MgO, 2 parts CaO, 5 parts SiO2, 8.88 parts H3BO3, 2.8 parts TiO2, 3.5 parts Al2O3, 1.43 parts K2CO3, and 2.55 parts Li2CO3.

[0096] Comparative Example 4

[0097] The specific implementation method of this comparative example is the same as that of Example 1, except that the mass ratio of the glass frit to the inorganic filler is 80:20.

[0098] Comparative Example 5

[0099] The specific implementation method of this comparative example is the same as that of Example 1, except that, by weight, the raw materials for preparing the glass frit are:

[0100] 35 parts CaO, 32.5 parts SiO2, 16.7 parts H3BO3, and 15.8 parts Al2O3.

[0101] Comparative Example 6

[0102] This comparative example was prepared according to the specific implementation method of Example 1 in Chinese Patent CN101805125B.

[0103] Figure 1 The figures show the actual images of the insulating slurry and electrodes prepared for each embodiment and comparative example after sintering; in the figures, 1# is comparative example 1, 2# is comparative example 2, 3# is comparative example 3, 4# is example 1, 5# is example 2, 6# is example 3, 7# is example 4, 8# is comparative example 4, 9# is comparative example 6, 10# is comparative example 5, 11# is example 5, and 12# is example 6.

[0104] Figure 2 Images showing the sintered thickness of the insulating slurry and electrodes prepared for Comparative Examples 1 and 2; in the images: a is Comparative Example 1, with a thickness of 110.74 μm; b is Comparative Example 2, with a thickness of 116.25 μm.

[0105] Figure 3 Images show the sintering thickness of the insulating slurry and electrodes prepared in Comparative Example 3 and Example 1; in the images: c represents Comparative Example 3, with a thickness of 114.83 μm; d represents Example 1, with a thickness of 115.16 μm.

[0106] Figure 4 Images show the sintered thickness of the insulating slurry and electrodes prepared in Examples 2 and 3; in the images: e represents Example 2 with a thickness of 107.11 μm; f represents Example 3 with a thickness of 113.2 μm.

[0107] Figure 5 Images show the sintering thickness of the insulating slurry and electrodes prepared in Example 4 and Comparative Example 4; in the images: g represents Example 4 with a thickness of 113.45 μm; h represents Comparative Example 4 with a thickness of 113.08 μm.

[0108] Figure 6 Images showing the sintering thickness of the insulating slurry and electrodes prepared for Comparative Examples 5 and 6; in the images: i represents Comparative Example 6 with a thickness of 107.57 μm; j represents Comparative Example 5 with a thickness of 113.13 μm.

[0109] Figure 7 Images show the sintering thickness of the insulating slurry and electrodes prepared in Examples 5 and 6; in the images: k represents Example 5 with a thickness of 112.6 μm; l represents Example 6 with a thickness of 114.2 μm.

[0110] Performance testing

[0111] 1. Withstand Voltage Test: The 430 stainless steel insulating slurry prepared in each embodiment and comparative example was mixed with the composite material and the organic carrier at a mass ratio of 78:22 to prepare the insulating slurry. The insulating slurry was printed onto a 430 stainless steel substrate using a 150-mesh polyester screen, allowed to stand for 5 minutes, and then the organic carrier was dried at 200°C. The substrate was then sintered in an infrared sintering furnace at 850°C for 10 minutes, removed, and cooled to room temperature. Figure 1 As shown; repeat the above operation three times to achieve a sintering thickness of over 80 μm (test its thickness as shown). Figure 2 As shown in the figure, the thickness is measured using a digital thickness gauge. Then, conductive silver paste is printed onto the insulating layer. A withstand voltage tester is used, with one end clamped to the stainless steel substrate and the other end connected to the conductive silver paste. The voltage at which the substrate breaks down is the failure voltage. The withstand voltage parameters are: AC, 3KV, rise for 10s, 5mA held for 2s.

[0112] Preparation method of organic carrier: 38.8 wt% terpineol and 33.3 wt% triethylene glycol monomethyl ether were added to a beaker at 80°C and stirred to form a homogeneous solution. Then, 16.7 wt% rosin resin and 11.2 wt% ethyl cellulose resin were added while stirring. After the resin was completely dissolved, stirring was continued for 60 min. The mixture was then allowed to stand and cool to room temperature to obtain the organic carrier.

[0113] 2. Warpage was measured using a laser warpage meter on each sample prepared for the pressure resistance test. The test results are shown in Table 1. In the table, the X and Y planes represent the warpage of the sample's length and width in the horizontal direction, respectively.

[0114] Table 1

[0115]

[0116] As can be seen from Table 1, the insulating slurry prepared by the composite materials in Examples 1-6 has a withstand voltage value exceeding 2500 V / 80μm, and the substrate warpage is significantly reduced. Comparative Example 5 does not contain raw materials such as BaCO3 and ZrO2, and its withstand voltage value and substrate warpage are significantly insufficient. In Comparative Example 4, the amount of inorganic filler added is too large, and its failure voltage is reduced too much, only 1.48kV. After the insulating slurry and electrode sintering of Comparative Example 6, it was found that its substrate warpage is too large and it is not suitable for use in large-sized thick-film heaters.

Claims

1. A composite material for 430 stainless steel insulating paste, characterized by, The preparation raw materials of the glass frit include glass frit and inorganic filler; the preparation raw materials of the glass frit include, in parts by weight: 60-90 parts of BaSO4, 5-18 parts of ZrO2, 5-8 parts of MgO, 2-3 parts of CaO, 5-11 parts of SiO2, 5-9 parts of H3BO3, 2-4 parts of TiO2, 0-2 parts of K2CO3, 0-3 parts of Li2CO3, 3-5 parts of Al2O3; The mass ratio of the glass frit to the inorganic filler is (90-95):(5-10); The inorganic filler is ZrO2 or TiO2 and ZrO2 with a mass ratio of 3:

7.

2. The composite material for 430 stainless steel insulating paste according to claim 1, characterized by, The average particle size D50 of TiO2 in the inorganic filler is less than 10 μm.

3. The composite material for 430 stainless steel insulating paste according to claim 1, characterized by, The average particle size D50 of ZrO2 in the inorganic filler is less than 20 μm.

4. The composite material for 430 stainless steel insulating paste according to any one of claims 1 to 3, characterized by, The average particle size D50 of the composite material is 2-4 μm.

5. A method of producing a composite material for 430 stainless steel insulating paste according to any one of claims 1 to 4, characterized by, At least comprising the following steps: S1, preparation of the glass frit; S2, sieving the glass frit and the inorganic filler after ball milling in a ball mill for 5-6 h, to obtain the composite material.

6. The method of claim 5, wherein the 430 stainless steel insulating paste composite is prepared by mixing 30-50 wt% of the 430 stainless steel powder, 30-50 wt% of the glass frit, 10-20 wt% of the glass fiber, and 0.1-1 wt% of the fluxing agent. The preparation method of the glass frit comprises: The preparation raw materials of the glass frit are placed in a mixer for mixing for 100-150 min, and then the materials are transferred to a crucible and heated to 1500-1800 ℃ with a high-temperature furnace, and then poured into a water quenching tank for cooling, and then the materials are taken out and drained, and then dried at 100-120 ℃ for 2-3 h, to obtain the glass frit.

Images