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

A two-step sintering method for preparing zno varistor ceramics

A technology of pressure-sensitive ceramics and sintering method, which is applied in the field of preparation and application of electronic ceramics, can solve the problems of high production cost, long time consumption, uneven microstructure, etc., and achieve high nonlinear coefficient, small leakage current and high potential gradient Effect

Inactive Publication Date: 2017-01-04
CHANGZHOU UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of sintering method of ZnO pressure-sensitive ceramic material, overcome the deficiency in the sintering process of traditional preparation ZnO pressure-sensitive ceramic, and solve the inhomogeneous microstructure of current ZnO pressure-sensitive ceramic material, compactness is not ideal, and High production cost, long time-consuming and other issues

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
  • A two-step sintering method for preparing zno varistor ceramics
  • A two-step sintering method for preparing zno varistor ceramics
  • A two-step sintering method for preparing zno varistor ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Preparation of nanocomposite ZnO powder

[0032] (1) Analytical pure Zn(NO 3 ) 2 ·6H 2 O, Bi(NO 3 ) 2 ·5H 2 O, Co(NO 3 ) 2 ·6H 2 O is the raw material, first

[0033] The above raw materials were prepared into a 1mol / L solution, mixed at a molar ratio of 96:3:1, stirred evenly, and heated at 60°C to obtain a solution.

[0034] (2) Add sucrose to solution A to dissolve it completely to obtain solution B. The molar ratio of the amount of sucrose added to the sum of metal salt ions in the system is 1:1.

[0035] (3) Add ammonium nitrate to solution B, continue heating at 60°C, and stir for 30 minutes to dissolve it. The molar ratio of the amount of ammonium nitrate added to the sum of metal salt ions in the system is 1:4.

[0036] (4) Dry the obtained liquid at 120°C for 4 hours to obtain carbonized black loose substance C.

[0037] (5) Pre-sinter C at a temperature of 500 °C for 2 h to synthesize nanopowders.

[0038] 2. Preparation of ZnO varistor ceramics...

Embodiment 2

[0042]In this embodiment, when preparing nanocomposite ZnO powder, the weight of each component is the same as in Example 1, the molar ratio of the sugar addition to the metal salt ion in the system is 2:1; the addition of ammonium nitrate is 2:1 relative to the system The molar ratio of metal salt ions is 1:3; the liquid is dried at 140° C., and dried for 4 hours to obtain a carbonized black loose substance; the above materials are prepared into ZnO varistor ceramics using the same process steps as in Example 1. When the ceramic sintering temperature reaches 1100°C, the holding time is 2h.

Embodiment 3

[0044] In this example, when preparing the nanocomposite ZnO powder, the weight of each component is the same as in Example 1, and the molar ratio of the sugar addition to the metal salt ion in the system is 1:1; the addition of ammonium nitrate is 1:1 relative to the system The molar ratio of metal salt ions is 1:4; the liquid is dried at 120° C., and dried for 4 hours to obtain a carbonized black loose substance; the above materials are prepared into ZnO varistor ceramics using the same process steps as in Example 1. The holding time is 3 hours when the ceramic sintering temperature reaches 1000°C.

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

PropertyMeasurementUnit
sizeaaaaaaaaaa
diameteraaaaaaaaaa
shrinkageaaaaaaaaaa
Login to View More

Abstract

The invention relates to a two-step sintering method for a ZnO pressure-sensitive ceramic material, belonging to the technical field of electronic ceramic preparation and application. It includes the steps of adding nano-composite ZnO powder into polyvinyl alcohol solution for grinding, granulating, sieving and pressing into flakes, and the step of sintering ZnO pressure-sensitive ceramics, which is characterized in that the ZnO pressure-sensitive ceramics is sintered by a two-step sintering method, The sintering steps are as follows: heat up to 1200°C at 5~10°C / min, hold for 30 minutes, cool down to 1000~1100°C at 5°C / min, cool down to 500°C at 5°C / min after holding for 1~5 hours, and then cool naturally to room temperature. According to the two-step sintering method, the microstructure of the ZnO varistor ceramic material is improved, and the electrical properties of the ZnO varistor ceramic material are improved.

Description

technical field [0001] The invention relates to a two-step sintering method of a ZnO pressure-sensitive ceramic material, belonging to the technical field of electronic ceramic preparation and application. Background technique [0002] ZnO varistor ceramic is a polycrystalline electronic device, which mainly has the function of detecting and limiting transient surge voltage. It is a sintered material with ZnO as the main body and some other oxides modified. It is widely used in electronic equipment due to its low cost, excellent non-ohmic characteristics, fast response time, small leakage current, and large flow capacity. and power systems and other fields. Usually in the preparation process, with ZnO as the main body, a small amount of low melting point oxide Bi 2 o 3 , Sb 2 o 3 and transition metal oxides MnO 2 ,Co 2 o 3 and Cr 2 o 3 , made of ZnO varistor ceramics by high temperature sintering. [0003] The traditional preparation method of ZnO varistor ceramic...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/64C04B35/453
Inventor 王茂华马小玉江雯
Owner CHANGZHOU UNIV