Preparation method of T-Core inductor based on hot pressing sintering and T-Core inductor

Abstract

The invention provides a preparation method of a T-Core inductor based on hot pressed sintering. The method comprises the following steps: providing metal soft magnetic powder added with nanocrystalline powder; the metal soft magnetic powder is subjected to phosphating treatment; mixing high-temperature organic silicon resin, a dispersing agent, a coupling agent and acetone according to a preset proportion, after the mixture is completely mixed, gelling the mixture with the phosphatized metal soft magnetic powder, granulating and drying to obtain granulated powder; putting the granulated powder into a mold, and carrying out hot pressing to obtain a molded T-Core primary blank; and sintering the T-Core primary blank by adopting a gradient heating sintering process and introducing a nitrogen-hydrogen mixed atmosphere, and obtaining the T-Core inductor after sintering for a preset time. The problem that in the prior art, the mechanical property of the T-Core inductor prepared through low-temperature baking after cold press forming is poor is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of inductor preparation, and in particular to a preparation method of a T-Core inductor based on hot pressing and sintering and the T-Core inductor. Background Art

[0002] T-Core inductors are specifically designed for ultra-thin, ultra-compact, one-piece inductors. Their manufacturing process involves cold-pressing the core followed by coil winding, a process that differs from traditional one-piece inductor manufacturing methods. By optimizing the magnetic powder and wire design, they achieve thinner inductors and higher performance.

[0003] Traditional T-core inductors are mostly cold-pressed and then baked at low temperatures (160-180°C), which presents the following problems: 1. Poor mechanical properties: Cold-pressed inductors have low density, a bending strength of only 10-20N, are prone to breakage, and are unable to meet the requirements of high-frequency vibration environments; 2. Inadequate magnetic properties: Uneven powder coating results in low effective magnetic permeability (20-30), high high-frequency losses, and limits the increase in power density; 3. Limited volume: Insufficient material density makes miniaturization difficult; 4. Process defects: Low-temperature baking cannot completely eliminate internal stress, resulting in low product yield (<85%) and prone to microcracks. 5. Excessive pressure: To obtain high-performance T-Core products, high pressing pressure is required, which shortens the service life of the mold. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a method for preparing a T-Core inductor based on hot pressing and sintering, aiming to solve at least one of the problems raised in the above background technology.

[0005] An object of the present invention is to provide a method for preparing a T-Core inductor based on hot pressing and sintering, the method comprising:

[0006] Providing metal soft magnetic powder added with nanocrystalline powder;

[0007] Phosphating the metal soft magnetic powder;

[0008] A preset proportion of high-temperature organic silicone resin, dispersant, coupling agent and acetone are mixed, and after the mixture is completely mixed, the mixture is gelled with the phosphated metal soft magnetic powder and granulated and dried to obtain granulated powder;

[0009] The granulated powder is placed in a mold and hot pressed to obtain a T-Core blank;

[0010] The T-Core blank is sintered using a gradient temperature rise sintering process and a nitrogen-hydrogen mixed atmosphere. After sintering for a preset time, the T-Core inductor is obtained.

[0011] Furthermore, in the above-mentioned method for preparing a T-Core inductor based on hot pressing and sintering, the step of providing a metal soft magnetic powder body added with nanocrystalline powder comprises:

[0012] The iron-based powder is mixed with nanocrystalline powder of a preset ratio in a dry mixer, and the metal soft magnetic powder is obtained after mixing for a preset time;

[0013] Among them, the iron-based powder is any one of iron-silicon-chromium alloy powder, iron-nickel alloy powder, iron-silicon-aluminum alloy powder, iron-silicon alloy powder, ferrite, carbonyl iron powder, and hydroxyl iron powder; the addition ratio of nanocrystalline powder is 15%-30%, and the D50 of the nanocrystalline powder is below 8um; and the mixing time is 10±2min.

[0014] Furthermore, in the above-mentioned method for preparing a T-Core inductor based on hot pressing and sintering, the step of phosphating the metal soft magnetic powder comprises:

[0015] A mixed solution of phosphoric acid and acetone in a preset ratio is added to the metal soft magnetic powder, stirred in a blender for a preset time, and then dried;

[0016] The addition ratio of phosphoric acid is 0.2%-0.3%, and the addition ratio of acetone is 10%.

[0017] Furthermore, in the above-mentioned method for preparing a T-Core inductor based on hot pressing and sintering, in the step of mixing a high-temperature silicone resin, a dispersant, a coupling agent, and acetone in a preset ratio:

[0018] The addition ratio of high-temperature silicone resin is 3.5%-6%, the addition ratio of dispersant is 0.5%-1.5%, and the addition ratio of coupling agent is 0.3-0.8%;

[0019] Wherein, the dispersant is polyacrylate, and the coupling agent is a silane coupling agent.

[0020] Furthermore, in the above-mentioned method for preparing a T-Core inductor based on hot pressing and sintering, in the step of placing the granulated powder in a mold and hot pressing to obtain a formed T-Core blank:

[0021] The hot pressing temperature is 60℃-80℃, and the hot pressing pressure is 2-3 tons.

[0022] Furthermore, in the above-mentioned method for preparing a T-Core inductor based on hot pressing sintering, wherein the step of adopting a gradient temperature sintering process and introducing a nitrogen-hydrogen mixed atmosphere to sinter the T-Core preform to obtain the T-Core inductor after sintering for a preset time is as follows:

[0023] The temperature of the gradient heating is 900℃-1000℃.

[0024] Furthermore, in the above-mentioned method for preparing a T-Core inductor based on hot pressing sintering, wherein the step of adopting a gradient temperature sintering process and introducing a nitrogen-hydrogen mixed atmosphere to sinter the T-Core preform to obtain the T-Core inductor after sintering for a preset time is as follows:

[0025] After heating to the preset temperature, keep warm for 1h-3h.

[0026] Furthermore, in the above-mentioned method for preparing a T-Core inductor based on hot pressing sintering, wherein the step of adopting a gradient temperature sintering process and introducing a nitrogen-hydrogen mixed atmosphere to sinter the T-Core preform to obtain the T-Core inductor after sintering for a preset time is as follows:

[0027] In the nitrogen-hydrogen mixed gas, hydrogen accounts for 3%-5%.

[0028] Furthermore, in the above-mentioned method for preparing the T-Core inductor based on hot pressing sintering, an alumina ceramic mold is used in the step of adopting a gradient temperature rising sintering process and introducing a nitrogen-hydrogen mixed atmosphere to sinter the T-Core blank, and obtaining the T-Core inductor after sintering for a preset time.

[0029] Another object of the present invention is to provide a T-Core inductor based on hot pressing and sintering, which is prepared using the above-mentioned method for preparing a T-Core inductor based on hot pressing and sintering.

[0030] Compared with the existing technology: The present invention abandons the traditional cold pressing + baking process and innovatively adopts hot pressing combined with a controllable sintering process. The formula of metal soft magnetic powder is optimized by adding nanocrystalline powder, organic dispersants and silane coupling agents are introduced to improve the uniformity of powder coating, and a gradient temperature rise sintering process is designed to avoid cracking. The strength of the sintered T-Core inductor of the present invention is increased to 30-40N (traditional 10-20N), the effective magnetic permeability reaches 60-85 (traditional 20-30), the volume is reduced by more than 50%, and the magnetic loss is reduced by 30% under high temperature and high frequency. It solves the problems of poor mechanical properties and insufficient magnetic properties of T-Core inductors in the existing technology.

[0031] In addition, the present invention has at least the following beneficial effects:

[0032] 1. Breakthrough in core structural performance. The innovative formulation of nanocrystalline composite materials, combined with a gradient hot pressing process, significantly improves the core's mechanical strength and permeability. The introduction of nanocrystalline powder enhances grain boundary bonding, ensuring the core maintains excellent resistance to fracture even in an ultra-thin form. The gradient hot pressing process also densifies the powder, effectively suppressing magnetic losses in high-frequency scenarios and providing a material foundation for miniaturized inductor design.

[0033] 2. Improved manufacturing process reliability. The hot-pressing sintering process system, through the synergistic modification of organic dispersants and silane coupling agents, overcomes the uneven powder coating problem encountered in traditional cold pressing. The gradient sintering process, protected by a nitrogen-hydrogen mixed atmosphere, eliminates internal stress while preventing grain boundary oxidation. Combined with the thermal expansion adaptability of alumina molds, this significantly reduces the risk of product cracking and enables mass production of complex magnetic core structures.

[0034] 3. Production efficiency and cost optimization. New granulation molding technology reduces raw material loss, and low-temperature hot pressing reduces mold loss, achieving a systematic improvement in resource utilization. Optimized temperature control in the sintering process shortens the heat treatment cycle. Combined with process integration design, this significantly improves production line efficiency, creating a cost-competitive, high-performance magnetic core manufacturing solution.

[0035] 4. Expanding and innovating application scenarios. This core exhibits stable magnetic properties across a wide temperature range, combining high power density with miniaturization. It breaks through the performance bottleneck of traditional magnetic components in high-temperature and high-frequency environments, providing core component support for cutting-edge fields such as new energy vehicle electric drive systems, 5G communication equipment, and high-density server power supplies, driving the evolution of electronic components towards high efficiency and energy conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Flowchart of a method for preparing a T-Core inductor based on hot pressing and sintering according to one embodiment of the present invention;

[0037] Figure 2 FIG. 4 is a diagram illustrating the sintering process in a method for preparing a T-Core inductor based on hot pressing sintering according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0039] Furthermore, as used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. In the detailed description and claims, a list of items connected by the term "one of" may mean any of the listed items. For example, if items A and B are listed, the phrase "one of A and B" means only A or only B. In another example, if items A, B, and C are listed, the phrase "one of A, B, and C" means only A; only B; or only C. Item A may contain a single element or multiple elements. Item B may contain a single element or multiple elements. Item C may contain a single element or multiple elements. In the detailed description and claims, a list of items connected by the terms "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, the phrase "at least one of A and B" or "at least one of A or B" means only A; only B; or both A and B. In another example, if items A, B, and C are listed, the phrase "at least one of A, B, and C" or "at least one of A, B, or C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may include a single element or multiple elements. Item B may include a single element or multiple elements. Item C may include a single element or multiple elements.

[0040] In view of the problems of poor mechanical properties and insufficient magnetic properties of current T-Core inductors, this invention proposes a method for preparing T-Core inductors based on hot pressing and sintering. Figure 1 , wherein the method comprises:

[0041] Step S10: providing a metal soft magnetic powder body added with nanocrystalline powder.

[0042] The iron-based powder and the nanocrystalline powder of a preset ratio are mixed in a dry mixer, and the metal soft magnetic powder is obtained after mixing for a preset time;

[0043] The iron-based powder is any one of iron-silicon-chromium alloy powder, iron-nickel alloy powder, iron-silicon-aluminum alloy powder, iron-silicon alloy powder, ferrite, carbonyl iron powder, and hydroxyl iron powder; the addition ratio of nanocrystalline powder is 15%-30%, the D50 of the nanocrystalline powder is below 8 μm, and nanocrystalline ultrafine powder is beneficial to improving the density of the product; the mixing time is 10±2 min;

[0044] Step S11, performing phosphating treatment on the metal soft magnetic powder.

[0045] Specifically, a mixed solution of phosphoric acid and acetone in a preset ratio is added to the metal soft magnetic powder, stirred in a blender for a preset time, and then dried;

[0046] The addition ratio of phosphoric acid is 0.2%-0.3%, and the addition ratio of acetone is 10%.

[0047] Step S12: Mix high-temperature organic silicone resin, dispersant, coupling agent, and acetone in a preset ratio, gelate with the phosphated soft magnetic metal powder after complete mixing, and granulate and dry to obtain granulated powder.

[0048] Among them, the addition ratio of high temperature silicone resin is 3.5%-6%, the addition ratio of dispersant is 0.5%-1.5%, and the addition ratio of coupling agent is 0.3-0.8%;

[0049] Among them, the dispersant is polyacrylate, the coupling agent is silane coupling agent, and the introduction of organic dispersing aid (polyacrylate) and silane coupling agent improves the uniformity of powder coating.

[0050] In step S13, the granulated powder is placed in a mold and hot-pressed to obtain a T-Core blank.

[0051] Among them, the hot pressing temperature is 60℃-80℃, and the hot pressing pressure is 2-3 tons.

[0052] Step S14: adopting a gradient temperature sintering process and introducing a nitrogen-hydrogen mixed atmosphere to sinter the T-Core blank, and obtaining a T-Core inductor after sintering for a preset time.

[0053] Among them, Figure 2 As shown, the gradient heating temperature is 900℃-1000℃, and the hydrogen accounts for 3%-5% in the nitrogen-hydrogen mixed atmosphere. The gradient sintering process under the protection of the nitrogen-hydrogen mixed atmosphere eliminates internal stress while avoiding grain boundary oxidation. Combined with the thermal expansion adaptation characteristics of the alumina mold, the risk of product cracking is greatly reduced.

[0054] On the other hand, the present invention further provides a T-Core inductor, which is prepared using the above-mentioned method for preparing a T-Core inductor based on hot pressing and sintering.

[0055] To facilitate understanding of the present invention, several embodiments of the present invention are provided below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive disclosure of the present invention.

[0056] Example 1

[0057] (1) Powder preparation: 70% iron silicon chromium powder + 15% nanocrystalline powder were mixed in a dry mixer for 10 ± 2 minutes;

[0058] (2) Phosphating: Add a mixed solution of 0.2% phosphoric acid + 10% acetone to the powder, stir in a blender for 30 minutes, and then dry.

[0059] (3) Granulation: 3.5% high-temperature silicone resin + 0.5% dispersant + 0.3% coupling agent + 10% acetone are mixed, and after the mixing is complete, the mixture is gelled with the phosphating powder and granulated and dried to obtain a powder;

[0060] (4) T-core pressing: Place the granulated powder into a mold and perform hot pressing at 70°C and 2T pressure to obtain a T-core embryo;

[0061] (5) T-core pressing and sintering: A gradient temperature rise sintering process of 900 °C and a sintering time of 1 h were used. Alumina ceramic molds were used and a nitrogen-hydrogen mixed atmosphere was introduced for sintering.

[0062] Example 2

[0063] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0064] Step (3) uses ordinary silicone resin.

[0065] Example 3

[0066] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0067] Step (3) cancels the dispersant.

[0068] Example 4

[0069] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0070] Step (3) cancels the coupling agent.

[0071] Example 5

[0072] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0073] Step (1) uses iron silicon powder.

[0074] Example 6

[0075] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0076] In step (5), the gradient is eliminated and sintering is performed directly at 900°C.

[0077] Example 7

[0078] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0079] In step (5), the alumina ceramic mold is eliminated.

[0080] Example 8

[0081] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0082] The nanocrystalline powder is eliminated in step (1).

[0083] Example 9

[0084] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0085] In step (1), the nitrogen-hydrogen mixed atmosphere is eliminated and a vacuum mode is adopted.

[0086] Example 10

[0087] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0088] Step (4) uses cold pressing and 2T pressure.

[0089] Example 11

[0090] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0091] Step (4) uses cold pressing and 4T pressure.

[0092] Example 12

[0093] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0094] Step (4) uses cold pressing and 6T pressure.

[0095] Example 13

[0096] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0097] Step (4) adopts cold pressing and 6T pressure, and step (5) adopts baking at 160°C for 10 hours in air atmosphere.

[0098] Example 14

[0099] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0100] Step (3) uses only 3.5% epoxy resin, step (4) uses cold pressing and 6T pressure, and step (5) uses baking at 160° C. for 10 hours in air atmosphere.

[0101] Example 15

[0102] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0103] Step (3) uses only 6% epoxy resin, step (4) uses cold pressing and 6T pressure, and step (5) uses baking at 160° C. for 10 hours in an air atmosphere.

[0104] Example 16

[0105] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0106] In step (3), 0.5% dispersant + 0.3% coupling agent is eliminated, cold pressing and 6T pressure are adopted in step (4), and baking at 160° C. for 10 hours in air atmosphere is adopted in step (5).

[0107] Example 17

[0108] This embodiment also proposes a method for preparing a T-Core inductor based on hot pressing and sintering. The method for preparing a T-Core inductor based on hot pressing and sintering proposed in this embodiment differs from the method for preparing a T-Core inductor based on hot pressing and sintering proposed in Example 1 in that:

[0109] In step (3), 0.5% dispersant + 0.3% coupling agent was removed, cold pressing and 6T pressure were adopted in step (4), and baking at 160° C. for 1 hour in air atmosphere was adopted in step (5).

[0110] Please refer to Table 1 below, which shows the inductance performance test and appearance test data of the T-Core inductors prepared according to the parameters of Examples 1-17 of the present invention. The test frequency is 1 MHz / 1 V, and the test sample is 100 pieces.

[0111] Table 1

[0112]

[0113]

[0114] It can be seen that the T-Core inductor prepared by hot pressing and sintering process has significantly improved the strength, DC bias and other performance of the T-Core inductor, and the number of appearance defects has been significantly reduced.

[0115] In summary, the present invention optimizes the metal soft magnetic powder formula by adding nanocrystalline powder to increase product density. It also introduces organic dispersants and silane coupling agents to improve powder coating uniformity, powder dispersion, and interfacial bonding strength. Furthermore, it employs a gradient temperature sintering process to reduce internal stress and prevent cracking. A nitrogen-hydrogen mixture is introduced during the sintering process to inhibit oxidation and promote grain boundary diffusion. Furthermore, an alumina ceramic mold is used to reduce sintering shrinkage stress. These solutions address the problems of poor mechanical properties and insufficient magnetic characteristics associated with existing T-Core inductors.

[0116] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for preparing a T-Core inductor based on hot pressing and sintering, characterized in that: The method comprises: Providing metal soft magnetic powder added with nanocrystalline powder; Phosphating the metal soft magnetic powder; A preset proportion of high-temperature organic silicone resin, dispersant, coupling agent and acetone are mixed, and after the mixture is completely mixed, the mixture is gelled with the phosphated metal soft magnetic powder and granulated and dried to obtain granulated powder; The granulated powder is placed in a mold and hot pressed to obtain a T-Core blank; The T-Core blank is sintered using a gradient temperature rise sintering process and a nitrogen-hydrogen mixed atmosphere. After sintering for a preset time, the T-Core inductor is obtained.

2. The method for preparing a T-Core inductor based on hot pressing and sintering according to claim 1, characterized in that: The step of providing a metal soft magnetic powder body added with nanocrystalline powder comprises: The iron-based powder is mixed with nanocrystalline powder of a preset ratio in a dry mixer, and the metal soft magnetic powder is obtained after mixing for a preset time; Among them, the iron-based powder is any one of iron-silicon-chromium alloy powder, iron-nickel alloy powder, iron-silicon-aluminum alloy powder, iron-silicon alloy powder, ferrite, carbonyl iron powder, and hydroxyl iron powder; the addition ratio of nanocrystalline powder is 15%-30%, and the D50 of the nanocrystalline powder is below 8um; and the mixing time is 10±2min.

3. The method for preparing a T-Core inductor based on hot pressing and sintering according to claim 1, characterized in that: The step of phosphating the metal soft magnetic powder comprises: A mixed solution of phosphoric acid and acetone in a preset ratio is added to the metal soft magnetic powder, stirred in a blender for a preset time, and then dried; The addition ratio of phosphoric acid is 0.2%-0.3%, and the addition ratio of acetone is 10%.

4. The method for preparing a T-Core inductor based on hot pressing and sintering according to claim 1, characterized in that: In the step of mixing the high-temperature silicone resin, dispersant, coupling agent and acetone in a preset ratio: The addition ratio of high-temperature silicone resin is 3.5%-6%, the addition ratio of dispersant is 0.5%-1.5%, and the addition ratio of coupling agent is 0.3-0.8%; Wherein, the dispersant is polyacrylate, and the coupling agent is a silane coupling agent.

5. The method for preparing a T-Core inductor based on hot pressing and sintering according to claim 1, characterized in that: In the step of placing the granulated powder into a mold and hot pressing to obtain a T-Core blank: The hot pressing temperature is 60℃-80℃, and the hot pressing pressure is 2-3 tons.

6. The method for preparing a T-Core inductor based on hot pressing and sintering according to claim 1, characterized in that: In the step of adopting a gradient temperature sintering process and introducing a nitrogen-hydrogen mixed atmosphere to sinter the T-Core blank, and obtaining the T-Core inductor after sintering for a preset time: The temperature of the gradient heating is 900℃-1000℃.

7. The method for preparing a T-Core inductor based on hot pressing and sintering according to claim 6, characterized in that: In the step of adopting a gradient temperature sintering process and introducing a nitrogen-hydrogen mixed atmosphere to sinter the T-Core blank, and obtaining the T-Core inductor after sintering for a preset time: After heating to the preset temperature, keep warm for 1h-3h.

8. The method for preparing a T-Core inductor based on hot pressing and sintering according to claim 7, characterized in that: In the step of adopting a gradient temperature sintering process and introducing a nitrogen-hydrogen mixed atmosphere to sinter the T-Core blank, and obtaining the T-Core inductor after sintering for a preset time: In the nitrogen-hydrogen mixed gas, hydrogen accounts for 3%-5%.

9. The method for preparing a T-Core inductor based on hot pressing and sintering according to claim 8, characterized in that: In the step of adopting a gradient temperature rising sintering process and introducing a nitrogen-hydrogen mixed atmosphere to sinter the T-Core blank, and obtaining the T-Core inductor after sintering for a preset time, an alumina ceramic mold is used.

10. A T-Core inductor based on hot pressing and sintering, characterized in that: The T-Core inductor is prepared by the preparation method based on hot pressing and sintering according to any one of claims 1 to 9.

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