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BaTiO3-based PTC (Positive Temperature Coefficient) ceramic and preparation method thereof

A technology for ceramics and ceramic raw materials, which is applied in the field of component design and preparation of doped BaTiO3-based PTC ceramics. It can solve the problems of segregation of doping elements, etc., and achieve increased doping concentration, improved PTC performance, and small grain size. and even effect

Inactive Publication Date: 2015-05-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome existing BaTiO 3 The problem of severe segregation of dopant elements in PTC-based ceramics, the invention provides a BaTiO3-based PTC ceramics and its preparation method

Method used

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  • BaTiO3-based PTC (Positive Temperature Coefficient) ceramic and preparation method thereof
  • BaTiO3-based PTC (Positive Temperature Coefficient) ceramic and preparation method thereof
  • BaTiO3-based PTC (Positive Temperature Coefficient) ceramic and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Step 1: BaTiO 3 Synthesis of main ingredients

[0067] 1) BaCO 3 、TiO 2 Mix according to the molar ratio of 1:1, and carry out planetary ball milling for the mixed powder, the ball milling time is 8h, the speed is 400r / min, and ZrO 2 The balls are milled particles, and alcohol is used as the milling medium to obtain mixture A. Among them, m (球磨粉末) :m (球磨颗粒) :m (球磨介质) =1:3:1.2;

[0068] 2) Dry the ball-milled powder (100°C, 10h), sieve, and pre-fire at 1150°C for 2h to synthesize BaTiO 3 Main material; Step 2: introduction of doping elements

[0069] 1) BaTiO in step 1 3 Main ingredients according to formula Y 0.01 -Mn 0.0006 -(Ba 0.965 Ca 0.035 )TiO 3 with Y 2 o 3 , MnCO 3 , CaTiO 3 , AST (Al 2 o 3 , SiO 2 、TiO 2 ) powders were mixed, ball milled (the ball milling conditions were the same as step 1), dried (100° C., 10 h), and sieved to obtain mixture B. where Al 2 o 3 , SiO 2 、TiO 2 As a sintering aid, its molar percentages are 0.1 at.%, 1 at...

Embodiment 2

[0096] Step 1: BaTiO 3 Synthesis of main ingredients

[0097] 1) BaCO 3 、TiO 2 Mix according to the molar ratio of 1:1, and carry out planetary ball milling for the mixed powder, the ball milling time is 8h, the speed is 400r / min, and ZrO 2 The balls are milled particles, and alcohol is used as the milling medium to obtain mixture A. Among them, m (球磨粉末) :m (球磨颗粒) :m (球磨介质) =1:3:1.2;

[0098] 2) Dry the ball-milled powder (100°C, 10h), sieve, and pre-fire at 1150°C for 2h to synthesize BaTiO 3 Main material; Step 2: introduction of doping elements

[0099] 1) BaTiO in step 1 3 Main ingredients according to formula Y 0.005 -Mn 0.0006 -(Ba 0.965 Ca 0.035 )TiO 3 with Y 2 o 3 , MnCO 3 , CaTiO 3 , AST (Al 2 o 3 , SiO 2 、TiO 2 ) powders were mixed, ball milled (the ball milling conditions were the same as step 1), dried (100° C., 10 h), and sieved to obtain mixture B. where Al 2 o 3 , SiO 2 、TiO 2 As a sintering aid, its molar percentages are 0.1 at.%, 1 a...

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Abstract

The invention relates to BaTiO3-based PTC (Positive Temperature Coefficient) ceramic and a preparation method thereof. The BaTiO3-based PTC ceramic is doped BaTiO3 ceramic. The preparation method comprises the following steps of A) preparing BaTiO3-based PTC ceramic raw material powder; B) performing at least twice pre-sintering on the BaTiO3-based PTC ceramic raw material powder, wherein the pre-sintering process comprises the steps of pre-sintering at 1000-1500 DEG C and grinding; C) prilling and forming the BaTiO3-based PTC ceramic raw material powder subjected to at least twice pre-sintering to obtain ceramic blanks; D) sintering the ceramic at 1100-1500 DEG C to obtain the BaTiO3-based PTC ceramic.

Description

technical field [0001] The invention belongs to the technical field of preparation of electronic ceramic components, in particular to doped BaTiO 3 The composition design and preparation process of PTC-based ceramics, the main content includes the study of the influence of multiple pre-firing processes on the structure, composition and electrical properties of barium titanate-based PTC ceramics. Background technique [0002] BaTiO 3 PTC-based ceramics have attracted attention due to their wide application in integrated circuits and other fields. However, there are still many unresolved problems in the process, such as the segregation of doping elements at the trident grain boundaries, and the sintering process of the grains. Abnormal growth problem. On the one hand, the segregation of doping elements leads to the effective donor doping concentration N d and the effective acceptor density of states N s It is far lower than the theoretical doping concentration; on the othe...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622C04B35/64
Inventor 高军李永祥
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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