Unlock instant, AI-driven research and patent intelligence for your innovation.

Insulating ceramic coating for piezoresistor and preparation method thereof

A technology of varistors and insulating ceramics, applied in the field of insulating ceramic coatings for varistors and its preparation, to achieve the effects of increasing potential gradients, reducing costs, and suppressing high-current impact flashovers

Inactive Publication Date: 2019-03-22
上海大学浙江嘉兴新兴产业研究院
View PDF2 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides an insulating ceramic coating for varistors and a preparation method thereof, which can effectively suppress high-current impact flashover, can be sintered at one time, and have no environmental pollution problems

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Insulating ceramic coating for piezoresistor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a kind of insulating ceramic coating for piezoresistor, according to the raw material configuration of following percentage by weight: ZnO: 84.5%; Sb 2 o 3 :7.1%; Bi 2 o 3 :3.2%;Co 3 o 4 : 1.5%; Mn 3 o 4 :0.2%;Cr 2 o 3 : 0.4%; SiO 2 : 3.1%.

[0030] The preparation method of the insulating ceramic coating for the above-mentioned varistor comprises the following steps:

[0031] Prepare ceramic coating powder raw materials according to the above ratio and mix them with deionized water, and add 0.9% of dispersant to the total mass of the powder to prepare a mixed slurry with a solid content of 60%. The slurry is ball-milled for 48 hours, then dried and pulverized to obtain a ceramic coating powder.

[0032] First configure a PVA solution with a mass percentage concentration of 5%, then take the above ceramic coating powder, the ratio of the total mass of the powder to the mass of the PVA solution is 5:3, take 2% of the total mass of the ...

Embodiment 2

[0038] This embodiment provides a kind of insulating ceramic coating for piezoresistor, according to the raw material configuration of following percentage by weight: ZnO: 89.5%; Sb 2 o 3 :5.1%; Bi 2 o 3 :2.1%;Co 3 o 4 : 1.2%; Mn 3 o 4 : 0.4%; Cr 2 o 3 : 0.6%; SiO 2 : 1.1%.

[0039] The insulating ceramic coating for the above-mentioned varistor comprises the following steps:

[0040] Prepare ceramic coating powder raw materials according to the above ratio and mix them with deionized water, and add 0.4% dispersant to the total mass of the powder to make a mixed slurry with a solid content of 70%. The slurry is ball milled for 36 hours, then dried and pulverized to obtain a ceramic coating powder.

[0041] First configure a PVA solution with a mass percentage concentration of 5%, then take the above ceramic coating powder, the ratio of the total mass of the powder to the mass of the PVA solution is 5:3, take 2% of the total mass of the powder as a dispersant, and pu...

Embodiment 3

[0045]This embodiment provides a kind of insulating ceramic coating for piezoresistor, according to the raw material configuration of following percentage by weight: ZnO: 85.8%; Sb 2 o 3 :6.2%; Bi 2 o 3 :3.7%;Co 3 o 4 : 1.6%; Mn 3 o 4 :0.1%;Cr 2 o 3 : 0.6%; SiO 2 : 2.0%.

[0046] The insulating ceramic coating for the above-mentioned varistor comprises the following steps:

[0047] Prepare ceramic coating powder raw materials according to the above ratio and mix them with deionized water, and add 0.4% dispersant to the total mass of the powder to make a mixed slurry with a solid content of 70%. The slurry was ball milled for 36 hours at a ball milling speed of 480 r / min, then dried and pulverized to obtain a ceramic coating powder.

[0048] First configure the mass percent concentration as 5% PVA solution, then take the above-mentioned ceramic coating powder, the ratio of the total mass of the powder to the mass of the PVA solution is 5:3, take 2% of the total mass ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an insulating ceramic coating for a piezoresistor. The insulating ceramic coating is prepared from the following raw materials in mass percent: 83-90% of ZnO, 5-8% of Sb2O3, 2-4% of Bi2O3, 1-1.8% of Co3O4, 0.1-0.3% of Mn3O4, 0.3-0.9% of Cr2O3, and 1-4% of SiO2. Furthermore, the invention further provides a preparation method of the insulating ceramic coating for the piezoresistor. The insulating ceramic coating provided by the invention and a green body can be interpenetrated and tightly combined, the electric potential gradient at the edge of a resistor disc is improved, thereby effectively suppressing the large current to impact the flashover; once-firing can be realized, the production process of the coating is simplified, the cost can be reduced, and the insulating ceramic coating is lead-free and free from environment pollution, and good in application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrical ceramics, and in particular relates to an insulating ceramic coating for a piezoresistor and a preparation method thereof. Background technique [0002] The varistor is a resistive device with nonlinear volt-ampere characteristics, which is mainly used for voltage clamping when the circuit is subjected to overvoltage, absorbing excess current to protect sensitive devices. Varistors coated with side insulating coatings can significantly improve their resistance to high current shocks. Varistors include varistors used to protect low-voltage electronic circuits and varistors used to protect high-voltage fields. The composition ratio of the two is very different. The performance requirements of the two for the side coating of insulating coatings There are also obvious differences. At present, the side coating materials of zinc oxide resistors include lead-containing side glazes, organic coatings ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B35/453C04B35/622
CPCC04B35/453C04B35/62222C04B2235/3241C04B2235/3263C04B2235/3277C04B2235/3294C04B2235/3298C04B2235/3418
Inventor 施利毅任鑫姚政袁帅时雯余文琪
Owner 上海大学浙江嘉兴新兴产业研究院