Ignition resistor preparation method

Abstract

The invention relates to the technical field of ignition resistor preparation, and discloses an ignition resistor preparation method which comprises the following steps: preparing a conductive material, and mixing a conductive oxide and an auxiliary agent to form conductive slurry; coating conductive slurry on the surface of the substrate to form a uniform resistance layer; carrying out sintering treatment on the coated substrate; the resistance value is adjusted through laser trimming; coating a protective coating on the surface of the resistive layer, and curing; testing the performance of resistor products, and screening qualified products; wherein the conductive material comprises ruthenium oxide and tin oxide, a microwave sintering process is adopted in the sintering treatment, and a trimming path is dynamically adjusted through real-time online monitoring in the laser trimming process. By adopting a composite conductive material of ruthenium oxide and tin oxide and adding nanoscale cerium oxide as an auxiliary agent, the preparation process and the material ratio of the conductive paste are optimized, and the technical effect of remarkably improving the conductive performance and the long-term stability of the resistor is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ignition resistor preparation, in particular to a method for preparing an ignition resistor. Background Art

[0002] Ignition resistors are widely used in harsh environments such as high temperature and high pressure, especially in automobiles, aerospace and industrial equipment. As a component that controls the current through the circuit, the stability, conductivity and durability of the ignition resistor are crucial to the long-term reliable operation of the equipment. Traditional methods for preparing ignition resistors usually rely on a single conductive material, such as tin oxide and copper oxide. Although these materials have certain conductivity, in practical applications, they often have problems such as uneven conductivity and poor long-term stability.

[0003] At present, the conductive materials commonly used in the manufacturing process of ignition resistors are mostly single metal oxides. Due to the differences in their physical properties and chemical stability, it is difficult for these materials to maintain consistent resistance values ​​in high temperature and high humidity environments. Especially in high temperature and high humidity environments such as automobiles and electronic equipment, single oxide materials are prone to resistance drift after long-term use, resulting in unstable equipment operation and even failure. This is because traditional materials are prone to oxidation and uneven sintering in extreme environments, which affects the density and conductivity of the resistor layer and reduces the durability and stability of the product.

[0004] In addition, the traditional sintering process uses hot sintering or conventional sintering furnaces. These methods have problems such as uneven heating and long sintering time. During the hot sintering process, the temperature and time are not accurately controlled, which can easily lead to excessive oxidation or local overheating of the material during the sintering process, thereby affecting the stability and accuracy of the resistance value. At the same time, the traditional sintering process is also relatively rough in controlling the morphological consistency and resistance value of the product, and often relies on manual adjustment or post-processing to compensate for the problem of uneven resistance, which increases production difficulty and cost and reduces production efficiency. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a method for preparing an ignition resistor, which solves the problem that the conductive materials commonly used in the manufacturing process of the ignition resistor are mostly single metal oxides, and these materials are difficult to maintain a consistent resistance value in a high temperature and high humidity environment due to differences in their respective physical properties and chemical stability.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for preparing an ignition resistor, comprising the following steps:

[0007] preparing a conductive material, mixing a conductive oxide with an additive to form a conductive paste;

[0008] Coating a conductive paste on the surface of the substrate to form a uniform resistance layer;

[0009] Sintering the coated substrate;

[0010] Adjust the resistance value through laser trimming;

[0011] Applying a protective coating on the surface of the resistor layer and curing it;

[0012] The performance of resistor products is tested and qualified products are screened; wherein the conductive material comprises ruthenium oxide and tin oxide, the sintering treatment adopts a microwave sintering process, and the laser trimming dynamically adjusts the trimming path through real-time online monitoring.

[0013] Further, a conductive material is prepared, and a conductive oxide is mixed with an additive to form a conductive paste; the conductive oxide includes ruthenium oxide and tin oxide, ruthenium oxide provides good conductivity and thermal stability, tin oxide helps to adjust the resistance value and improve the mechanical strength of the overall material, and the additive can be nano-scale cerium oxide, which helps to improve the viscosity and coating performance of the paste and improve the high-temperature oxidation resistance of the resistor layer;

[0014] Conductive paste is coated on the surface of the substrate to form a uniform resistor layer. During the coating process, screen printing or spraying technology is used to ensure that the conductive paste is evenly coated on the surface of the substrate and the thickness of the resistor layer is consistent, thereby ensuring the stability of the resistor performance.

[0015] The coated substrate is sintered; the sintering process adopts microwave sintering technology. Compared with the traditional thermal sintering method, microwave sintering can provide more uniform heating and significantly shorten the sintering time, which can improve the density and conductivity of the material, make the resistor layer more uniform, and ensure that the ignition resistor has excellent conductivity and mechanical strength;

[0016] Adjust the resistance value through laser trimming; laser trimming can accurately adjust the resistance value, dynamically adjust the trimming path through the real-time online monitoring system, and adjust the laser power to ensure that the error in the trimming process is controlled within a very small range, further ensuring the accuracy and consistency of the resistance value, thereby meeting the requirements of high-precision resistance;

[0017] A protective coating is applied on the surface of the resistor layer and cured. The main function of the protective coating is to enhance the thermal stability and anti-oxidation ability of the resistor layer and prevent the influence of the external environment (such as moisture and oxygen) on the resistor performance. The protective coating material can be glass glaze or silicon nitride, which can effectively extend the service life of the ignition resistor and improve its reliability in high temperature and high humidity environments.

[0018] Test the performance of resistor products and screen qualified products; during the test process, in addition to standardizing the resistance value, a long-term stability test is also required to ensure that the resistor product will not have obvious resistance drift under changes in temperature and humidity, and screen out high-quality ignition resistors that meet the standards to meet the strict requirements of resistors in different application scenarios; wherein, the conductive material contains ruthenium oxide and tin oxide, the sintering treatment adopts a microwave sintering process, and the laser trimming dynamically adjusts the trimming path through real-time online monitoring. These technical means effectively improve the performance of the ignition resistor, making it have higher stability, precision and durability.

[0019] Preferably, in the conductive material preparation step, the conductive oxide is a mixture of ruthenium oxide and tin oxide, the auxiliary agent is nano-scale cerium oxide, and the mass ratio of ruthenium oxide to tin oxide is 90:10 to 95:5.

[0020] Further, in the step of preparing the conductive material, the conductive oxide is a mixture of ruthenium oxide and tin oxide. Ruthenium oxide has excellent conductivity and thermal stability, which can significantly improve the performance of the resistor layer in a high-temperature working environment, while tin oxide helps to adjust the resistance value and improve the mechanical strength of the resistor layer, improving its stability under high pressure and high humidity. The mass ratio of ruthenium oxide to tin oxide is 90:10 to 95:5. This ratio can balance conductivity and stability, while ensuring high conductivity, avoiding the problem of material embrittlement that may be caused by excessive ruthenium oxide content. The auxiliary agent is nano-scale cerium oxide, which has a high specific surface area and can improve the adhesion and fluidity of the slurry during the preparation process, thereby improving the uniformity and consistency during the coating process. At the same time, the addition of cerium oxide also has antioxidant properties, which can enhance the antioxidant ability of the resistor layer under high temperature and high humidity environments, thereby extending the service life of the ignition resistor and ensuring its long-term stability.

[0021] Preferably, the viscosity of the conductive paste is controlled between 1000 and 5000 mPa·s to ensure uniform coating of the paste and control of layer thickness.

[0022] Furthermore, the viscosity of the conductive paste is controlled between 1000 and 5000 mPa·s to ensure that the paste has appropriate fluidity and stability during the coating process, so that it can be evenly coated on the substrate surface to form a uniform resistor layer. Too low viscosity will cause the paste to be too fluid, which may cause flow or uneven diffusion during the coating process, thus affecting the uniformity and performance of the resistor layer; while too high viscosity will make coating difficult, and the paste will be difficult to evenly distribute on the substrate surface, and may even lead to incomplete coating or inconsistent coating thickness, thus affecting the electrical performance and stability of the ignition resistor.

[0023] Preferably, the coating step is performed by a screen printing process, and the thickness of the coating layer is controlled between 20 μm and 30 μm to ensure the stability and performance consistency of the resistance layer.

[0024] Preferably, the sintering step adopts a microwave sintering process with a sintering temperature of 800° C. to 900° C. and a sintering time of 20 to 30 minutes to improve the density and conductivity of the material.

[0025] Preferably, in the laser trimming step, the laser power is 0.5 W to 1.5 W, the trimming error is controlled within ±0.1%, and a real-time online monitoring system is used to adjust the laser power to accurately adjust the resistance value.

[0026] Furthermore, the coating step is carried out through a screen printing process, which can accurately control the thickness and uniformity of the coating, ensuring that the conductive paste is evenly coated on the surface of the substrate, thereby forming a consistent resistor layer and avoiding the unevenness problems that may be caused by traditional coating methods. By adjusting the mesh size and printing pressure of the screen, the thickness of the coating can be controlled between 20μm and 30μm. This thickness range can effectively ensure the stability of the resistor layer and keep the resistance value consistent between different batches and different products, meeting the needs of high-performance ignition resistors. In addition, the appropriate coating thickness helps to improve the durability and antioxidant capacity of the resistor layer, further enhancing the stability of the ignition resistor in long-term use.

[0027] The sintering step uses a microwave sintering process, which can provide uniform and rapid heating, avoiding the problem of uneven sintering of materials caused by temperature gradients in traditional heating methods. The rapid heating characteristics of microwave sintering make the sintering process more efficient and can achieve a higher sintering temperature in a shorter time, thereby improving the density and conductivity of the conductive material and ensuring that the resistor layer has excellent electrical properties and mechanical strength. The sintering temperature is controlled between 800°C and 900°C, which can effectively promote the bonding of oxides and the growth of grains, further enhancing the conductivity and thermal stability of the resistor layer. The sintering time is set at 20 to 30 minutes to ensure that the material is completely sintered and achieves the best performance indicators.

[0028] During the laser trimming step, the laser power is 0.5W to 1.5W. Laser trimming can accurately adjust the resistance value on a microscopic scale to ensure that the resistance value of each ignition resistor meets strict accuracy requirements. The control range of the laser power can achieve a fine trimming effect while avoiding excessive heating or burning of the material due to excessive power. The trimming error is controlled within ±0.1%, which can achieve high-precision resistance adjustment and meet the stringent requirements of the ignition resistor for resistance value accuracy. During the laser trimming process, a real-time online monitoring system is used to adjust the laser power through dynamic feedback to ensure that the resistance value of each product accurately meets the design requirements, thereby improving the consistency and stability of the product.

[0029] Preferably, the protective coating is composed of glass glaze or silicon nitride, and the thickness of the protective coating is controlled between 5 μm and 10 μm to provide sufficient thermal stability and anti-oxidation performance.

[0030] Preferably, the resistance test includes a long-term stability test under temperature and humidity changes, and the drift of the resistance value does not exceed ±2% to ensure its reliability during long-term use.

[0031] Preferably, the final resistance value of the ignition resistor is controlled within an accuracy of ±1%, and this accuracy is achieved by optimizing the material ratio, sintering process and laser trimming process.

[0032] Preferably, in the preparation method, the stability and durability of the resistor are optimized by adjusting the ratio of the conductive material, the sintering process parameters and the laser trimming process, and the resistor performs excellently in a high temperature and high humidity environment.

[0033] Furthermore, the resistance test includes a long-term stability test under temperature and humidity changes. The long-term stability test can simulate the working state of the ignition resistor in the actual use environment and ensure that the resistance layer maintains a stable resistance value under temperature fluctuations and humidity changes. By conducting accelerated aging tests under different temperature and humidity conditions, the ignition resistor's ability to resist environmental changes can be evaluated, and it can be ensured that there will be no significant resistance drift during long-term use, thereby ensuring the reliability and stability of the ignition resistor. The drift of the resistance value does not exceed ±2%. This standard requires that the ignition resistor can work for a long time in extreme environments without affecting its ignition performance or the normal operation of the circuit due to excessive resistance changes, ensuring that the product has lasting reliability under various working conditions.

[0034] The final resistance value of the ignition resistor is controlled within ±1%. The precise resistance value is crucial to the performance of the ignition resistor, especially in application scenarios that require high-precision resistance value control, such as automotive electronics, ignition systems, etc. By optimizing the material ratio, sintering process, and laser trimming process, the resistance value of the resistor layer can be accurately adjusted and maintained within a very small deviation range, thereby ensuring that the resistance value of each batch and each product meets strict performance standards. This precision control not only ensures product consistency, but also meets the high requirements of resistance accuracy for different applications, and enhances the market competitiveness of the product.

[0035] In the preparation method, the stability and durability of the resistor are optimized by adjusting the ratio of the conductive material, the sintering process parameters and the laser trimming process, especially in high temperature and high humidity environments. By accurately controlling the ratio of ruthenium oxide and tin oxide, optimizing the microwave sintering temperature and time, and using laser trimming technology, the stability and durability of the ignition resistor in harsh environments can be greatly improved while ensuring the accuracy of the resistance value. These optimization measures enable the ignition resistor to maintain excellent performance under harsh conditions such as high temperature, humidity, and vibration, and is not prone to resistance drift or failure, ensuring its reliability in long-term use, especially in high temperature and high humidity environments, greatly improving the reliability and adaptability of the product.

[0036] The present invention provides a method for preparing an ignition resistor, which has the following beneficial effects:

[0037] 1. The present invention uses a composite conductive material of ruthenium oxide and tin oxide, and by adding nano-cerium oxide as an additive, optimizes the preparation process and material ratio of the conductive paste, achieving the technical effect of significantly improving the resistance conductivity and long-term stability. Compared with the technical solution that only relies on a single conductive oxide in the prior art, it solves the problems of uneven material conductivity and poor stability, and is more reliable in high temperature environments.

[0038] 2. The present invention combines microwave sintering technology with laser trimming technology, and uses real-time online monitoring to dynamically adjust the trimming path, ensuring accurate adjustment of the resistance value and achieving the technical effect of process consistency and high-precision resistance control. Compared with the process solution that relies on traditional sintering and manual adjustment in the prior art, it solves the problems of insufficient process accuracy and poor product consistency, and significantly improves production efficiency and quality control level.

[0039] 3. The present invention uses glass glaze or silicon nitride as a protective coating, and optimizes the coating thickness control and curing process, so that the ignition resistor has excellent thermal stability and anti-oxidation performance in extreme environments such as high temperature and high humidity, achieving the technical effect of enhancing product durability. Compared with the technical solutions of simple coating selection and coating process in the prior art, it solves the problem of easy oxidation and poor durability of the product, and is more suitable for long-term use needs and application scenarios in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Please see attached Figure 1 :

[0043] Example 1: Example with innovative ingredients within the range and process parameters within the range of values ​​Steps and process parameters:

[0044] Preparation of conductive material: ruthenium oxide and tin oxide are mixed in a mass ratio of 90:10, and nano-scale cerium oxide is added as an auxiliary agent. After mixing evenly, a conductive paste is obtained.

[0045] Slurry coating: The slurry is evenly coated on the surface of the substrate by screen printing, and the thickness of the coating layer is controlled at 25 μm.

[0046] Sintering treatment: microwave sintering process is adopted, the sintering temperature is set at 850°C, and the sintering time is 25 minutes.

[0047] Laser trimming: Using laser trimming equipment, the laser power is set to 1.0W and the trimming error is controlled within ±0.05%.

[0048] Protective coating: A silicon nitride protective coating is applied on the resistor layer with a coating thickness of 7 μm, and then cured.

[0049] Performance test: Conduct resistance performance test and ensure resistance drift does not exceed ±1% in long-term stability test. Also conduct stability test in high temperature (300℃) and high humidity environment.

[0050] Technical effect:

[0051] Excellent conductivity ensures stable resistance during long-term use.

[0052] The resistance value is highly accurate and the process is finely controlled to avoid resistance value fluctuations.

[0053] The high temperature resistance and oxidation resistance of the ignition resistor are improved to meet the needs of complex environments.

[0054] Example 2: Example with innovative ingredients lower than the range and example with process parameters lower than the range

[0055] Steps and process parameters:

[0056] Preparation of conductive material: ruthenium oxide and tin oxide are mixed in a mass ratio of 85:15, and nano-scale cerium oxide is added as an auxiliary agent. After mixing evenly, a conductive paste is obtained.

[0057] Slurry coating: The slurry is evenly coated on the surface of the substrate by screen printing, and the thickness of the coating layer is controlled at 22 μm.

[0058] Sintering treatment: microwave sintering process is adopted, the sintering temperature is set to 820°C, and the sintering time is 20 minutes.

[0059] Laser trimming: Using laser trimming equipment, the laser power is set to 0.8W and the trimming error is controlled within ±0.1%.

[0060] Protective coating: A glass glaze protective coating is applied on the resistor layer with a coating thickness of 6 μm and then cured.

[0061] Performance Test: Long-term stability test is performed to ensure that the resistance drift does not exceed ±2%.

[0062] Technical effect:

[0063] Although the composition is lower than the range value, it can still ensure good resistance and conductivity properties.

[0064] The stability is slightly lower, but it is still suitable for general industrial applications and has a lower production cost.

[0065] The performance in environmental adaptability is good, but slightly inferior to Example 1.

[0066] Example 3: Examples where the innovative ingredients are higher than the range and the process parameters are higher than the range

[0067] Steps and process parameters:

[0068] Preparation of conductive material: ruthenium oxide and tin oxide are mixed in a mass ratio of 95:5, nano-scale cerium oxide is added as an auxiliary agent, and after mixing evenly, a conductive paste is obtained.

[0069] Slurry coating: The slurry is evenly coated on the surface of the substrate by screen printing, and the thickness of the coating layer is controlled at 28 μm.

[0070] Sintering treatment: microwave sintering process is adopted, the sintering temperature is set to 880°C, and the sintering time is 30 minutes.

[0071] Laser trimming: Using laser trimming equipment, the laser power is set to 1.2W and the trimming error is controlled within ±0.05%.

[0072] Protective coating: A silicon nitride protective coating is applied on the resistor layer with a coating thickness of 9 μm and then cured.

[0073] Performance Test: Long-term stability test is performed to ensure that the resistance drift does not exceed ±0.5%.

[0074] Technical effect:

[0075] The conductivity and long-term stability of the resistor are improved, and the resistance drift is smaller.

[0076] High-precision laser trimming technology further optimizes the control of resistance value and reduces errors.

[0077] It has better durability in high temperature and high humidity environments and is suitable for applications with high-end requirements.

[0078] Example 4: Compared with the lack of innovation point 1, the example steps and process parameters of the components within the range values ​​are:

[0079] Preparation of conductive materials: Tin oxide is used as the only conductive material, ruthenium oxide is not added, and nano-scale cerium oxide is added as an auxiliary agent.

[0080] Slurry coating: The slurry is evenly coated on the surface of the substrate by screen printing, and the thickness of the coating layer is controlled at 25 μm.

[0081] Sintering treatment: microwave sintering process is adopted, the sintering temperature is set at 850°C, and the sintering time is 25 minutes.

[0082] Laser trimming: Using laser trimming equipment, the laser power is set to 1.0W and the trimming error is controlled within ±0.1%.

[0083] Protective coating: A glass glaze protective coating is applied on the resistor layer with a coating thickness of 7 μm and then cured.

[0084] Performance Test: Long-term stability test is performed to ensure that the resistance drift does not exceed ±2%.

[0085] Technical effect:

[0086] In the absence of ruthenium oxide, the conductivity is poor and the stability is poor.

[0087] The resistance value control is not as accurate as that of the present invention, and the long-term stability is not as good as that of Example 1.

[0088] Poor adaptability to high temperature and high humidity environments.

[0089] Example 5: Example with ingredients within the range value compared to the lack of innovation point 2

[0090] Steps and process parameters:

[0091] Conductive material preparation: Ruthenium oxide and tin oxide were mixed in a mass ratio of 90:10 without adding nano-scale cerium oxide.

[0092] Slurry coating: The slurry is evenly coated on the surface of the substrate by screen printing, and the thickness of the coating layer is controlled at 25 μm.

[0093] Sintering treatment: microwave sintering process is adopted, the sintering temperature is set at 850°C, and the sintering time is 25 minutes.

[0094] Laser trimming: Using laser trimming equipment, the laser power is set to 1.0W and the trimming error is controlled within ±0.1%.

[0095] Protective coating: A silicon nitride protective coating is applied on the resistor layer with a coating thickness of 7 μm, and then cured.

[0096] Performance Test: Long-term stability test is performed to ensure that the resistance drift does not exceed ±2%.

[0097] Technical effect:

[0098] In the absence of nano-sized cerium oxide, the coating uniformity of the slurry is poor and the stability of the resistor layer is poor.

[0099] The precise control of the resistance value is poor and the process consistency is reduced.

[0100] The stability and antioxidant properties are poor.

[0101] Comparative experiment 1: Comparison of resistance conductivity and long-term stability

[0102] sample Resistance and conductivity Long-term stability Embodiment 1 of the present invention Excellent ±1％ Embodiment 2 of the present invention good ±2％ Prior art (lack of ruthenium oxide) Poor ±5％

[0103] Comparative experiment 2: Comparison of thermal stability and antioxidant performance

[0104] sample Thermal stability Antioxidant properties Embodiment 1 of the present invention excellent excellent Embodiment 2 of the present invention good good Prior art (lack of cerium oxide) generally Poor

[0105] Comparative experiment 3: Comparison of process consistency and high-precision resistance control

[0106]

[0107]

[0108] Summarize

[0109] Through the above examples and comparative experiments, it can be clearly seen that the present invention has significantly improved the resistance conductivity, long-term stability, thermal stability, anti-oxidation performance and resistance value accuracy compared with the prior art. The innovative composition ratio and optimized process parameters have significantly enhanced the adaptability of the present invention in high temperature and high humidity environments, while improving the accuracy and consistency of the production process, ensuring the long-term stability of the resistor.

[0110] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing an ignition resistor, characterized in that: The following steps are involved: preparing a conductive material, mixing a conductive oxide with an additive to form a conductive paste; Coating a conductive paste on the surface of the substrate to form a uniform resistance layer; Sintering the coated substrate; Adjust the resistance value through laser trimming; Applying a protective coating on the surface of the resistor layer and curing it; The performance of resistor products is tested and qualified products are screened; wherein the conductive material comprises ruthenium oxide and tin oxide, the sintering treatment adopts a microwave sintering process, and the laser trimming dynamically adjusts the trimming path through real-time online monitoring.

2. The method for preparing an ignition resistor according to claim 1, characterized in that: In the conductive material preparation step, the conductive oxide is a mixture of ruthenium oxide and tin oxide, the auxiliary agent is nano-scale cerium oxide, and the mass ratio of ruthenium oxide to tin oxide is 90:10 to 95:

5.

3. The method for preparing an ignition resistor according to claim 1, characterized in that: The viscosity of the conductive paste is controlled between 1000 and 5000 mPa·s to ensure uniform coating of the paste and layer thickness control.

4. The method for preparing an ignition resistor according to claim 1, characterized in that: The coating step is performed by a screen printing process, and the thickness of the coating layer is controlled between 20 μm and 30 μm to ensure the stability and performance consistency of the resistance layer.

5. The method for preparing an ignition resistor according to claim 1, characterized in that: The sintering step adopts a microwave sintering process, the sintering temperature is 800° C. to 900° C., and the sintering time is 20 to 30 minutes to improve the density and conductivity of the material.

6. The method for preparing an ignition resistor according to claim 1, characterized in that: In the laser trimming step, the laser power is 0.5W to 1.5W, the trimming error is controlled within ±0.1%, and a real-time online monitoring system is used to adjust the laser power to accurately adjust the resistance value.

7. The method for preparing an ignition resistor according to claim 1, characterized in that: The protective coating is composed of glass glaze or silicon nitride, and the thickness of the protective coating is controlled between 5 μm and 10 μm to provide sufficient thermal stability and anti-oxidation performance.

8. The method for preparing an ignition resistor according to claim 1, characterized in that: The resistance test includes a long-term stability test under temperature and humidity changes, and the drift of the resistance value does not exceed ±2% to ensure its reliability during long-term use.

9. The method for preparing an ignition resistor according to claim 1, characterized in that: The final resistance value accuracy of the ignition resistor is controlled within ±1%, and this accuracy is achieved by optimizing the material ratio, sintering process and laser trimming process.

10. The method for preparing an ignition resistor according to claim 1, characterized in that: In the preparation method, the stability and durability of the resistor are optimized by adjusting the ratio of the conductive material, the sintering process parameters and the laser trimming process, and the resistor performs excellently in a high temperature and high humidity environment.

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