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Inorganic adhesive for ZnO voltage sensitive ceramic

A technology of inorganic adhesives and pressure-sensitive ceramics, applied in the direction of inorganic adhesives, adhesives, etc., can solve problems affecting the electrical properties of ZnO pressure-sensitive ceramics, improve flow capacity and aging characteristics, reduce process links, and withstand The effect of improving the high-current surge performance

Inactive Publication Date: 2010-09-15
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of organic binders generates CO at high temperatures 2 and H 2 O, leaving some pores and other defects inside the fired ceramics, thus affecting the electrical properties of ZnO varistor ceramics

Method used

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  • Inorganic adhesive for ZnO voltage sensitive ceramic
  • Inorganic adhesive for ZnO voltage sensitive ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Raw materials: commercially available magnesium aluminum silicate, aluminum nitrate, silver nitrate, and deionized water are used. According to aluminum magnesium silicate: aluminum nitrate: silver nitrate: deionized water = 1: 0.044: 0.08: 5 (mass ratio) weighing and mixing to prepare the inorganic binder. Then the composition weight ratio is 97%ZnO+1.5%Sb 2 o 3 +1.5% Bi 2 o 3 In the ZnO pressure-sensitive ceramic raw material powder, add the inorganic binder for ZnO pressure-sensitive ceramics prepared above, and based on the total weight of the ZnO pressure-sensitive ceramic raw material powder, the weight percentage of the added inorganic binder is 15 wt%. A resistor sheet with a diameter of 25mm and a thickness of 22mm was prepared by granulation and dry pressing, and a pressure-sensitive ceramic was obtained after sintering at 1150°C for 2 hours. For SEM photos of sintered samples, see figure 1 , it can be seen that it has good compactness.

Embodiment 2

[0023] Raw materials: commercially available magnesium aluminum silicate, aluminum nitrate, silver nitrate, and deionized water are used. According to aluminum magnesium silicate: aluminum nitrate: silver nitrate: deionized water = 1: 0.01: 0.3: 25 (mass ratio) weighing and mixing to prepare the inorganic binder. Then the composition weight ratio is 98%ZnO+1.5%Sb 2 o 3 +0.5% Bi 2 o 3 In the ZnO pressure-sensitive ceramic raw material powder, add the inorganic binder for ZnO pressure-sensitive ceramics prepared above, and based on the total weight of the ZnO pressure-sensitive ceramic raw material powder, the weight percentage of the added inorganic binder is 5wt%. A resistor sheet with a diameter of 25mm and a thickness of 22mm was prepared by granulation and dry pressing, and a pressure-sensitive ceramic was obtained after sintering at 1100°C for 1 hour.

Embodiment 3

[0025] Raw materials: commercially available magnesium aluminum silicate, aluminum nitrate, silver nitrate, and deionized water are used. According to aluminum magnesium silicate: aluminum nitrate: silver nitrate: deionized water = 1: 0.4: 0.02: 20 (mass ratio) weighing and mixing to prepare the inorganic binder. Then the composition weight ratio is 98%ZnO+0.5%Sb 2 o 3 +1.5% Bi 2 o 3 In the ZnO pressure-sensitive ceramic raw material powder, add the inorganic binder for ZnO pressure-sensitive ceramics prepared above, and based on the total weight of the ZnO pressure-sensitive ceramic raw material powder, the weight percentage of the added inorganic binder is 10 wt%. A resistor sheet with a diameter of 25mm and a thickness of 22mm was prepared by granulation and dry pressing, and a pressure-sensitive ceramic was obtained after sintering at 1200°C for 4 hours.

[0026] Refer to Table 1 for the comparative data of the sintered performance of the sintered resistor chips with ...

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Abstract

The invention belongs to the field of electric materials and preparations, and particularly relates to an inorganic adhesive for ZnO voltage sensitive ceramic. The inorganic adhesive for the ZnO voltage sensitive ceramic is a mixture colloid formed by mixing aluminum magnesium silicate, aluminum nitrate, silver nitrate and water. The inorganic adhesive is an adhesive which plays pelleting and molding roles same as a PVA (Polyvinyl Alcohol) adhesive and simultaneously is an additive for the ZnO voltage sensitive ceramic and can improve the electric property of the ZnO voltage sensitive ceramic. When the inorganic sol-type adhesive is used for preparing the ZnO voltage sensitive ceramic, the sensitive ceramic can be directly fired after pelleting and molding without a dumping process, therefore, the process links of the preparation of the ZnO voltage sensitive ceramic are decreased, and the production cost is reduced to a large extent.

Description

technical field [0001] The invention belongs to the field of electrical materials and preparation, and in particular relates to an inorganic binder for ZnO pressure-sensitive ceramics. Background technique [0002] In the process of preparing ZnO varistor ceramics, powder granulation and green body forming are important steps. Since the mixed and dried ZnO composite powder has small particles and poor fluidity, it is difficult to fill the space of each part of the mold during molding, and it has many pores and is easy to be layered. Therefore, the preparation process of ZnO varistor ceramics must go through the granulation stage. The so-called granulation is to add the mixed and dried powder to an appropriate binder to form agglomerates with a certain strength, a certain particle size and good fluidity. Due to the surface tension of the binder solution, many powder particles are stuck together and shrink into spherical aggregates. After granulation, the powder aggregate b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J1/00C04B35/453
Inventor 郑嘹赢李国荣李玉科程丽红曾江涛
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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