A gold electrode glass powder, its preparation method, gold electrode paste, and an NTC thermistor

Abstract

The application belongs to the technical field of NTC thermistors, and relates to a gold electrode glass powder, a preparation method, a gold electrode paste and an NTC thermistor. The glass powder is composed of the following components in percentage by mass: Bi2O320%-60%, B2O320%-40%, CuO 15%-35%, Li2O 2%-10%. In the gold electrode glass powder formula of the NTC thermistor in the application, the original Si element is replaced by the B element, the melting point of the B element is lower than that of the Si element, the melting point of the glass powder system can be about 650-670 DEG C, so that the melting point of the gold electrode paste glass powder is reduced, the gold electrode paste is stable and has good performance, the processing difficulty is reduced, and the gold electrode paste is better adapted to the NTC ceramic material.

Description

Technical Field

[0001] This invention relates to the field of NTC thermistor technology, and in particular to a gold electrode glass powder, a preparation method, a gold electrode paste, and an NTC thermistor. Background Technology

[0002] An NTC thermistor is a type of resistor made by coating a ceramic body with an electrode paste. Unlike ordinary resistors, the resistance of an NTC thermistor changes with temperature. It has the following advantages: high temperature sensitivity, small size, and short response time.

[0003] Gold electrode paste is one type of electrode paste for NTC thermistors. Glass powder is one of the base materials for gold electrode paste. Currently, ordinary glass powder has too high a melting point and is difficult to process, making it difficult for gold electrode paste to be well adapted to NTC ceramic materials. Summary of the Invention

[0004] The purpose of this invention is to provide a gold electrode glass powder, a preparation method, a gold electrode paste, and an NTC thermistor, which can ingeniously solve the above-mentioned problems.

[0005] This invention discloses a gold electrode glass powder for NTC thermistors, which, by mass percentage, consists of the following components:

[0006]

[0007]

[0008] Optionally, the glass powder consists of the following components by weight percentage:

[0009]

[0010] Optionally, the glass powder consists of the following components by weight percentage:

[0011]

[0012] Optionally, the glass powder consists of the following components by weight percentage:

[0013]

[0014] This invention also discloses a method for preparing gold electrode glass powder for NTC thermistors, used for preparing the gold electrode glass powder as described in any of the above claims, characterized in that the preparation method includes the following steps:

[0015] Weigh each component of the gold electrode glass powder according to any of the above proportions and mix them evenly to obtain a mixed raw material;

[0016] The raw materials are melted and mixed at a high temperature of 650-670℃ to obtain a glass solution;

[0017] The glass molten glass is quenched in water to obtain glass particles;

[0018] Glass particles are ball-milled, dried, and sieved to obtain gold electrode glass powder.

[0019] Optionally, the melting temperature of the high-temperature smelting mixture is 650°C.

[0020] This invention also discloses an NTC thermistor gold electrode paste, which, by mass percentage, comprises the following components:

[0021]

[0022] Among them, the glass powder is any of the glass powders mentioned above.

[0023] Optionally, the organic carrier comprises the following components by mass percentage:

[0024] Organic resin 20-30%

[0025] Dispersant 1%-5%

[0026] Organic solvent balance.

[0027] Optionally, the organic resin is ethyl cellulose; the dispersant is one or more of polymethyl methacrylate, NP phosphate (nonylphenol polyether phosphate), 600 phosphate, TSP phosphate (styrene polyether phosphate), and AEO-9 phosphate (fatty alcohol ether phosphate); and the organic solvent is one or more of terpineol, diethylene glycol butyl ether, diethylene glycol butyl ether acetate, octanol, benzyl alcohol, dibutyl phthalate, and dimethyl diformate.

[0028] The present invention also discloses an NTC thermistor, comprising a gold electrode, wherein the gold electrode comprises gold electrode glass powder as described above.

[0029] In the NTC thermistor gold electrode glass powder formulation of the present invention, element B is used to replace the original element Si. Element B has a lower melting point than element Si, which can make the melting point of the glass powder system around 650-670°C, thereby reducing the melting point of the gold electrode slurry glass powder. At the same time, the gold electrode slurry is stable and has good performance, reducing processing difficulties and making it easier to adapt the gold electrode slurry to NTC ceramic materials. Detailed Implementation

[0030] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, the invention can be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0031] The present invention will now be described in detail with reference to optional embodiments.

[0032] As an embodiment of the present invention, a gold electrode glass powder for an NTC thermistor is disclosed. The glass powder is composed of the following components by mass percentage: Bi2O3 20%-60%, B2O3 20%-40%, CuO 15%-35%, and Li2O 2%-10%.

[0033] In the NTC thermistor gold electrode glass powder formulation of the present invention, element B is used to replace the original element Si. Element B has a lower melting point than element Si, which can make the melting point of the glass powder system around 650-670°C, thereby reducing the melting point of the gold electrode slurry glass powder. At the same time, the gold electrode slurry is stable and has good performance, reducing processing difficulties and making it easier to adapt the gold electrode slurry to NTC ceramic materials.

[0034] Specifically, the proportion of Bi2O3 can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, or 60%. The proportion of B2O3 can be 20%, 25%, 30%, 35%, or 40%. The proportion of CuO can be 15%, 20%, 25%, 30%, or 35%. The proportion of Li2O can be 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%.

[0035] Specifically, by mass percentage, the glass powder consists of the following components: Bi₂O₃ 40%-50%, B₂O₃ 25%-35%, CuO 17%-30%, and Li₂O 5%-8%. More specifically, the percentage of Bi₂O₃ can be 40%, 42%, 44%, 46%, 48%, or 50%. The percentage of B₂O₃ can be 25%, 27%, 30%, 32%, or 35%. The percentage of CuO can be 17%, 19%, 20%, 22%, 25%, 27%, or 30%. The percentage of Li₂O can be 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, or 8%.

[0036] In one embodiment, the glass powder, by mass percentage, comprises the following components: 20% Bi₂O₃, 40% B₂O₃, 30% CuO, and 10% Li₂O. In another embodiment, the glass powder, by mass percentage, comprises the following components: 60% Bi₂O₃, 20% B₂O₃, 15% CuO, and 5% Li₂O.

[0037] This invention also discloses a method for preparing gold electrode glass powder for NTC thermistors, used for preparing the gold electrode glass powder as described above. Specifically, the preparation method includes the following steps:

[0038] Weigh each component of the gold electrode glass powder according to any of the above proportions and mix them evenly to obtain a mixed raw material;

[0039] S100: High-temperature melting and mixing of raw materials at 650-670℃ to obtain glass solution;

[0040] S200: Quenching the glass solution in water to obtain glass particles;

[0041] S300: Ball milling, drying and sieving of glass particles to obtain gold electrode glass powder.

[0042] In the NTC thermistor gold electrode glass powder formulation prepared by the method of the present invention, element B is used to replace the original element Si. Element B has a lower melting point than element Si, which can make the melting point of the glass powder system around 650-670℃, thereby reducing the melting point of the gold electrode slurry glass powder. At the same time, the gold electrode slurry is stable and has good performance, reducing processing difficulties and making it easier to adapt the gold electrode slurry to NTC ceramic materials.

[0043] Specifically, in step S100, the melting temperature of the mixed raw materials can be 650℃, 655℃, 660℃, 665℃, or 670℃, depending on the proportions of the components. Preferably, the melting temperature of the mixed raw materials can be 670℃ to ensure complete melting of the mixed raw materials. In step S100, the high-temperature melting of the mixed raw materials includes: holding the mixed raw materials at 700-780℃ for 0.6-1.5 hours. The holding time can be 0.6 hours, 0.7 hours, 0.8 hours, 0.9 hours, 1 hour, 1.1 hours, 1.2 hours, 1.3 hours, 1.4 hours, or 1.5 hours. Preferably, the holding time is 1 hour.

[0044] In step S300, the drying temperature is 60-80℃, specifically 60℃, 65℃, 70℃, 75℃, or 80℃.

[0045] This invention also discloses an NTC thermistor gold electrode paste, which, by mass percentage, comprises the following components: 70-80% gold powder, 2-10% glass powder, 1-3% glassy carbon, and 15-20% organic carrier. The glass powder is any of the glass powders described above. The NTC thermistor gold electrode paste of this invention uses the aforementioned glass powder, with an addition amount of 2-10%, resulting in a stable gold electrode paste with good performance.

[0046] Specifically, the proportion of gold powder can be 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, or 80%. The proportion of glass powder can be 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%. The proportion of glassy carbon can be 1%, 1.2%, 1.5%, 1.7%, 2%, 2.2%, 2.5%, 2.7%, or 3%. The proportion of organic carrier can be 15%, 16%, 17%, 18%, 19%, or 20%.

[0047] In one embodiment, the gold electrode paste comprises 70% gold powder, 2% glass powder, 1% glassy carbon, and 17% organic carrier. In another embodiment, the gold electrode paste comprises 75% gold powder, 5% glass powder, 3% glassy carbon, and 17% organic carrier. In yet another embodiment, the gold electrode paste comprises 70% gold powder, 7% glass powder, 3% glassy carbon, and 20% organic carrier.

[0048] Specifically, by mass percentage, the organic carrier consists of the following components: 20-30% organic resin, 1%-5% dispersant, and the balance organic solvent. The organic resin can be 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, or 30%.

[0049] Specifically, the organic resin is ethyl cellulose; the dispersant is one or more of polymethyl methacrylate, NP phosphate (nonylphenol polyether phosphate), 600 phosphate, TSP phosphate (styrene polyether phosphate), and AEO-9 phosphate (fatty alcohol ether phosphate); and the organic solvent is one or more of terpineol, diethylene glycol butyl ether, diethylene glycol butyl ether acetate, octanol, benzyl alcohol, dibutyl phthalate, and dimethyl diformate. When multiple dispersants and organic solvents are used, they can be combined as needed.

[0050] The present invention also discloses an NTC thermistor, comprising a gold electrode, the gold electrode comprising gold electrode glass powder as described above. The gold electrode on the NTC thermistor is formed by laying the gold electrode paste on the NTC ceramic body as described above.

[0051] Specifically, in one embodiment of the NTC thermistor of the present invention, the NTC thermistor further includes an NTC ceramic body, with a gold dioxide electrode deposited on one side of the NTC ceramic body, and the aforementioned gold electrode deposited on the gold dioxide electrode; the aforementioned gold electrode is directly deposited on the other side of the NTC ceramic body. In another embodiment, the NTC thermistor further includes an NTC ceramic body, with gold dioxide electrodes deposited on both sides of the NTC ceramic body, and the aforementioned gold electrode deposited on both sides of the gold dioxide electrodes.

[0052] The following detailed description uses specific examples and comparative models.

[0053] Example 1

[0054] Weigh each component of the gold electrode glass powder according to the proportions in Table 1, and mix them evenly to obtain the mixed raw material;

[0055] The mixed raw materials are transferred to a corundum crucible or a platinum crucible and gradually heated and melted in a muffle furnace. The temperature of the muffle furnace is gradually increased, and the mixed raw materials are melted to obtain a glass solution. The melting temperature is recorded.

[0056] After holding the glass solution at the melting temperature for 1 hour, the glass solution was quenched in water to obtain glass particles.

[0057] Glass particles are ball-milled, dried, and sieved to obtain gold electrode glass powder.

[0058] Example 2

[0059] Weigh each component of the gold electrode glass powder according to the proportions in Table 1, and mix them evenly to obtain the mixed raw material;

[0060] The mixed raw materials are transferred to a corundum crucible or a platinum crucible and gradually heated and melted in a muffle furnace. The temperature of the muffle furnace is gradually increased, and the mixed raw materials are melted to obtain a glass solution. The melting temperature is recorded.

[0061] After holding the glass solution at the melting temperature for 1 hour, the glass solution was quenched in water to obtain glass particles.

[0062] Glass particles are ball-milled, dried, and sieved to obtain gold electrode glass powder.

[0063] Example 3

[0064] Weigh each component of the gold electrode glass powder according to the proportions in Table 1, and mix them evenly to obtain the mixed raw material;

[0065] The mixed raw materials are transferred to a corundum crucible or a platinum crucible and gradually heated and melted in a muffle furnace. The temperature of the muffle furnace is gradually increased, and the mixed raw materials are melted to obtain a glass solution. The melting temperature is recorded.

[0066] After holding the glass solution at the melting temperature for 1 hour, the glass solution was quenched in water to obtain glass particles.

[0067] Glass particles are ball-milled, dried, and sieved to obtain gold electrode glass powder.

[0068] Example 4

[0069] Weigh each component of the gold electrode glass powder according to the proportions in Table 1, and mix them evenly to obtain the mixed raw material;

[0070] The mixed raw materials are transferred to a corundum crucible or a platinum crucible and gradually heated and melted in a muffle furnace. The temperature of the muffle furnace is gradually increased, and the mixed raw materials are melted to obtain a glass solution. The melting temperature is recorded.

[0071] After holding the glass solution at the melting temperature for 1 hour, the glass solution was quenched in water to obtain glass particles.

[0072] Glass particles are ball-milled, dried, and sieved to obtain gold electrode glass powder.

[0073] Comparative Example 1

[0074] Weigh each component of the gold electrode glass powder according to the proportions in Table 1, and mix them evenly to obtain the mixed raw material;

[0075] The mixed raw materials are transferred to a corundum crucible or a platinum crucible and gradually heated and melted in a muffle furnace. The temperature of the muffle furnace is gradually increased, and the mixed raw materials are melted to obtain a glass solution. The melting temperature is recorded.

[0076] After holding the glass solution at the melting temperature for 1 hour, the glass solution was quenched in water to obtain glass particles.

[0077] Glass particles are ball-milled, dried, and sieved to obtain gold electrode glass powder.

[0078] Table 1

[0079] <![CDATA[Bi2O3]]> <![CDATA[B2O3]]> CuO <![CDATA[Li2O]]> CaO <![CDATA[B2O3]]> ZnO MnO Example 1 20％ 40％ 30％ 10％ Example 2 60％ 20％ 15％ 5％ Example 3 50％ 33％ 15％ 2％ Example 4 30％ 25％ 35％ 10％ Comparative Example 1 1％ 25％ 5％ - 40％ 20％ 8％ 1％

[0080] The melting points of Examples 1-4 and Comparative Example 1 are shown in Table 2 below.

[0081] Table 2

[0082] Melting point Example 1 650℃ Example 2 653℃ Example 3 661℃ Example 4 670℃ Comparative Example 1 1200℃

[0083] As can be seen from the table above, compared with Comparative Example 1, the melting point of Examples 1-3 of the present invention is only about 650-670℃, and the melting point of the glass powder system is low.

[0084] It should be noted that the limitations on each step involved in this solution are not considered as limiting the order of steps, provided that they do not affect the implementation of the specific solution. The steps listed first can be executed first, later, or even simultaneously. As long as this solution can be implemented, it should be considered to fall within the protection scope of this invention.

[0085] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. An NTC thermistor gold electrode glass powder, characterized by, The glass powder is composed of the following components in percentage by mass: Bi2O320%-60%, B2O325%-40%, CuO 15%-35%, Li2O 2%-10%; The components of the gold electrode glass powder are weighed according to the above proportions, and mixed uniformly to obtain mixed raw materials; the mixed raw materials are high-temperature smelted at 650-670 ℃ to obtain a glass solution; the glass solution is quenched in water to obtain glass particles; the glass particles are ball milled, dried and sieved to obtain the gold electrode glass powder.

2. The NTC thermistor gold electrode glass powder according to claim 1, characterized in that The glass powder is composed of the following components in percentage by mass: Bi2O340%-50%, B2O325%-35%, CuO 17%-30%, Li2O 5%-8%.

3. The NTC thermistor gold electrode glass powder according to claim 2, characterized in that The glass powder is composed of the following components in percentage by mass: Bi2O320%, B2O340%, CuO 30%, Li2O 10%.

4. A method for the preparation of a gold electrode glass powder for NTC thermistors, for the preparation of a gold electrode glass powder as claimed in any one of claims 1 to 3, characterized in that The preparation method comprises the steps of: The components of the gold electrode glass powder are weighed according to the proportions of any one of claims 1 to 3, and mixed uniformly to obtain mixed raw materials; The mixed raw materials are high-temperature smelted at 650-670 ℃ to obtain a glass solution; The glass solution is quenched in water to obtain glass particles; The glass particles are ball milled, dried and sieved to obtain the gold electrode glass powder.

5. The production method according to claim 4, wherein The smelting temperature of the high-temperature smelting of the mixed raw materials is 650 ℃.

6. A NTC thermistor gold electrode paste, characterized by, The gold electrode paste is composed of the following components in percentage by mass: gold powder 70-80%, glass powder 2-10%, glass carbon 1-3%, and organic carrier 15-20%. The glass powder is the glass powder according to any one of claims 1 to 3.

7. The NTC thermistor gold electrode paste according to claim 6, wherein the gold electrode paste comprises 0.1 to 0.5 parts by weight of the dispersant. The organic carrier is composed of the following components in percentage by mass: organic resin 20-30%, dispersant 1%-5%, and organic solvent in the rest amount.

8. The NTC thermistor gold electrode paste according to claim 7, wherein the gold electrode paste comprises 0.1 to 0.5 parts by weight of the dispersant. The organic resin is ethyl cellulose; the dispersant is one or more of poly-methyl-acrylammonium, NP phosphate ester, 600 phosphate ester, TSP phosphate ester and AEO-9 phosphate ester; and the organic solvent is one or more of terpineol, diethylene glycol butyl ether, diethylene glycol butyl ether acetate, octanol, benzyl alcohol, o-xylylene glycol dibutyl ester, dimethyl dicarboxylate.

9. An NTC thermistor, characterized by, The gold electrode comprises the gold electrode glass powder according to any one of claims 1 to 3.

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