Novel high-temperature-resistant coil framework and sintering process thereof

Abstract

The invention provides a novel high-temperature-resistant coil framework and a sintering process thereof, and belongs to the technical field of electronic component manufacturing. The preparation method comprises the following steps: mixing Mo powder, B powder, Ni powder, Al powder and Cr powder to obtain a mixture; the mixture is dried and poured into a mold for compression molding, and a blank is obtained; and sintering the green body to obtain the novel high-temperature-resistant coil framework. The process ensures that the coil stably works in a high-temperature environment, and coil failure caused by framework deformation or melting is avoided. The sintering process can improve the reliability of the coil, prolong the service life of the coil and reduce the failure rate of equipment.

Description

Technical Field

[0001] This invention relates to the field of electronic component manufacturing technology, and in particular to a novel high-temperature resistant coil frame and its sintering process. Background Technology

[0002] To meet the performance enhancement requirements of next-generation engines, it is necessary to vigorously develop a new type of wide-temperature-range electro-hydraulic servo valve, expanding the temperature range that the jet pipe electro-hydraulic servo valve can withstand (from -55℃~180℃ to -55℃~250℃), and improving the performance stability and reliability of the jet pipe servo valve under high-temperature conditions of 250℃. Since high-temperature resistance and high driving force are the development direction of next-generation engines, to enhance product competitiveness, the development of such products should be initiated as soon as possible, as they have wide applicability and broad market prospects.

[0003] As a core component of jet-type electro-hydraulic servo valves, the torque motor's proper functioning directly determines the overall valve performance. The coil frame, a crucial part of the electromagnetic coil, primarily provides support and insulation for the coil, ensuring stable operation under harsh environments such as high temperature and high pressure. With products trending towards miniaturization, lightweighting, and high performance, higher demands are placed on the high-temperature resistance of the coil frame. Traditional coil frames, often made of plastic or ordinary ceramic materials, have limited high-temperature resistance, making them unsuitable for ultra-high-temperature products. Summary of the Invention

[0004] The purpose of this invention is to provide a novel high-temperature resistant coil frame and its sintering process, so as to solve the problem that the materials of existing coil frames are difficult to meet the requirements of ultra-high temperature performance.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a novel sintering process for a high-temperature resistant coil bobbin, comprising the following steps: 1) Mix Mo powder, B powder, Ni powder, Al powder and Cr powder to obtain a mixture; 2) After drying the mixture, pour it into a mold and press it into shape to obtain a blank; 3) The blank is sintered to obtain a new type of high-temperature resistant coil frame.

[0006] Furthermore, the mass ratio of Mo powder, B powder, Ni powder, Al powder and Cr powder is 0.3~0.87:0.3~0.87:0.01~0.2:0~0.1:0~0.1.

[0007] Furthermore, in step 1), the mixing process includes dry ball milling or wet ball milling, with a ball-to-material ratio of 7~10:1 and a milling time of 6~24h.

[0008] Furthermore, in wet ball milling, anhydrous ethanol is added as a dispersant, with a mass ratio of balls, material, and dispersant of 3~5:2:1, and a mixing time of 6~24h.

[0009] Furthermore, the drying temperature is 80~160℃, and the drying time is 8~10h.

[0010] Furthermore, the compression molding pressure is 100~400MPa.

[0011] Furthermore, the sintering process is carried out under an inert gas protection environment, wherein the inert gas includes argon or nitrogen. The sintering temperature is 800~1400℃, and the holding time is 20~80min.

[0012] Furthermore, the purity of the Mo powder, B powder, Ni powder, Al powder and Cr powder is independently ≥99.0%.

[0013] The present invention also provides a novel high-temperature resistant coil frame prepared by the sintering process of the above-mentioned novel high-temperature resistant coil frame.

[0014] The beneficial effects of this invention are: The Al- and Cr-containing MoNiB cermet selected in this invention possesses excellent comprehensive properties. Its mechanical properties, wear resistance, and corrosion resistance are all superior to other nickel-based alloy metals. Furthermore, nickel-based alloys exhibit excellent resistance to hot corrosion. It is generally believed that the reason nickel-based alloys are superior in this respect is that adding chromium to the molybdenum-nickel-boron alloy can form a protective layer on the alloy surface that resists alkali metal salts (Cr₂O₃). This enhances its performance, extends its service life, and saves costs.

[0015] The process of this invention ensures stable operation of the coil in high-temperature environments, preventing coil failure due to frame deformation or melting. The sintering process of this invention improves coil reliability and lifespan, reducing equipment failure rates. This sintering process also meets the product requirements for miniaturization, lightweight design, and high performance. Attached Figure Description

[0016] Figure 1 A three-dimensional view of the coil frame prepared according to the present invention; Figure 2 This is a front view of the coil frame prepared according to the present invention; Figure 3 Left view of the coil frame prepared according to the present invention; Figure 4 This is a top view of the coil frame prepared according to the present invention. Detailed Implementation

[0017] This invention provides a novel sintering process for a high-temperature resistant coil bobbin, comprising the following steps: 1) Mix Mo powder, B powder, Ni powder, Al powder and Cr powder to obtain a mixture; 2) After drying the mixture, pour it into a mold and press it into shape to obtain a blank; 3) The blank is sintered to obtain a new type of high-temperature resistant coil frame.

[0018] In this invention, the mass ratio of Mo powder, B powder, Ni powder, Al powder and Cr powder is 0.3~0.87:0.3~0.87:0.01~0.2:0~0.1:0~0.1, preferably 0.35~0.75:0.3~0.55:0.02~0.08:0~0.05:0~0.05, and more preferably 0.35~0.58:0.35~0.55:0.06:0~0.05:0~0.05.

[0019] In this invention, step 1) involves mixing using dry ball milling or wet ball milling, with a ball-to-material ratio of 7-10:1, preferably 8-9:1; and a milling time of 6-24 hours, preferably 8-20 hours, and more preferably 12-18 hours.

[0020] In this invention, wet ball milling involves adding anhydrous ethanol as a dispersant, and the mass ratio of balls, material, and dispersant is 3~5:2:1, preferably 4:2:1; the mixing time is 6~24h, preferably 8~20h, and more preferably 12~18h.

[0021] In this invention, the milling media are stainless steel balls.

[0022] In this invention, the drying temperature is 80~160℃, preferably 90~150℃, and more preferably 100~140℃; the drying time is 8~10h, preferably 9~10h.

[0023] In this invention, the compression molding pressure is 100~400MPa, preferably 200~300MPa, and more preferably 250MPa.

[0024] In this invention, the sintering process is carried out under the protection of an inert gas, which includes argon or nitrogen, preferably argon. The sintering temperature is 800~1400℃, preferably 900~1300℃, and more preferably 1000~1200℃; the holding time is 20~80min, preferably 40~60min.

[0025] In this invention, the purity of the Mo powder, B powder, Ni powder, Al powder and Cr powder is independently ≥99.0%.

[0026] The present invention also provides a novel high-temperature resistant coil frame prepared by the sintering process of the above-mentioned novel high-temperature resistant coil frame.

[0027] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0028] Example 1

[0029] Using Mo powder, Co powder, B powder, Cr powder, and Al powder with a purity of not less than 99% as raw materials, the mass fraction ratio was 0.58:0.36:0.06:0:0. Wet milling was used, with the powder and balls mixed at a mass ratio of 4:2:1 (balls:powder:anhydrous ethanol). The mixture was ball-milled for 20 hours, then dried in a drying oven at 120℃ for 8 hours. The resulting powder was then poured into a mold and molded under 250MPa pressure to obtain a green body. Vacuum furnace sintering was performed using Ar gas at 1000℃ for 50 minutes to obtain the desired green body. Figure 1 The novel high-temperature resistant coil frame shown is illustrated.

[0030] Example 2

[0031] Using Mo, Co, B, Cr, and Al powders with a purity of not less than 99% as raw materials, the mass fraction ratio was 0.554:0.35:0.06:0.05:0. A wet milling method was used, mixing the powders with an anhydrous ethanol at a mass ratio of 4:2:1. The ball mill jar was placed in a ball mill and milled for 15 hours. The raw materials were then dried in a drying oven at 150℃ for 6 hours. The resulting powder was poured into a mold and molded under a pressure of 300MPa to obtain a green body. Vacuum furnace sintering was performed using Ar gas at a sintering temperature of 900℃ for 60 minutes.

[0032] Example 3

[0033] Using Mo, Co, B, Cr, and Al powders with a purity of not less than 99% as raw materials, the mass fraction ratio was 0.554:0.35:0.06:0.05:0.05. A wet milling method was used, mixing the powders with an anhydrous ethanol at a mass ratio of 4:2:1. The ball mill jar was placed in a ball mill and milled for 10 hours. The raw materials were then dried in a drying oven at 100℃ for 10 hours. The resulting powder was then poured into a mold and molded under a pressure of 350MPa to obtain a green body. Vacuum furnace sintering was performed using Ar gas at a sintering temperature of 1200℃ for 40 minutes.

[0034] Example 4

[0035] Using Mo, Co, B, Cr, and Al powders with a purity of not less than 99% as raw materials, the mass fraction ratio was 0.46:0.38:0.12:0.023:0.015. The powder mixture was then dry-milled at a ball-to-material ratio of 7:1. The ball mill jar was placed in a ball mill and milled for 10 hours. The raw materials were then dried in a drying oven at 100℃ for 10 hours. The resulting powder was then poured into a mold and molded under a pressure of 400MPa to obtain a green body. Vacuum furnace sintering was performed using Ar gas at a sintering temperature of 800℃ for 80 minutes.

[0036] The performance of the novel high-temperature resistant coil frame obtained in the above embodiments was tested, and the results are shown in Table 1 below.

[0037] Table 1 Performance Test Results

[0038] As can be seen from the above embodiments, the present invention provides a novel high-temperature resistant coil frame and its sintering process. The sintering process of the present invention can improve coil reliability and service life, and reduce equipment failure rate. The sintering process of the present invention meets the product requirements for miniaturization, lightweighting, and high performance.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A novel sintering process for a high-temperature resistant coil bobbin, characterized in that, Includes the following steps: 1) Mix Mo powder, B powder, Ni powder, Al powder and Cr powder to obtain a mixture; 2) After drying the mixture, pour it into a mold and press it into shape to obtain a blank; 3) The blank is sintered to obtain a new type of high-temperature resistant coil frame.

2. The sintering process of the novel high-temperature resistant coil frame according to claim 1, characterized in that, The mass ratio of Mo powder, B powder, Ni powder, Al powder and Cr powder is 0.3~0.87:0.3~0.87:0.01~0.2:0~0.1:0~0.

1.

3. The sintering process of the novel high-temperature resistant coil frame according to claim 1 or 2, characterized in that, In step 1), the mixing process includes dry ball milling or wet ball milling, with a ball-to-material ratio of 7~10:1 and a milling time of 6~24h.

4. The sintering process of the novel high-temperature resistant coil frame according to claim 3, characterized in that, Wet ball milling involves adding anhydrous ethanol as a dispersant, with a mass ratio of balls, material, and dispersant of 3-5:2:1, and a mixing time of 6-24 hours.

5. The sintering process of the novel high-temperature resistant coil frame according to claim 1, 2, or 4, characterized in that, The drying temperature is 80~160℃, and the drying time is 8~10h.

6. The sintering process of the novel high-temperature resistant coil frame according to claim 5, characterized in that, The pressure for compression molding is 100~400MPa.

7. The sintering process of the novel high-temperature resistant coil frame according to claim 1, 2, 4, or 6, characterized in that, The sintering process is carried out under the protection of an inert gas, which includes argon or nitrogen. The sintering temperature is 800~1400℃, and the holding time is 20~80min.

8. The sintering process of the novel high-temperature resistant coil frame according to claim 1, characterized in that, The purity of the Mo powder, B powder, Ni powder, Al powder, and Cr powder is independently ≥99.0%.

9. A novel high-temperature resistant coil frame prepared by the sintering process of the novel high-temperature resistant coil frame according to any one of claims 1 to 8.

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