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Preparation method of barium strontium titanate semiconductive ceramics

A barium strontium titanate and semiconductor technology, which is applied in the field of preparation of barium strontium titanate semiconducting ceramics, can solve the problems of difficult co-firing of ceramic layers, uneven component distribution, impurity pollution, etc., and achieve good comprehensive PTCR performance, which is beneficial to Effects of layering and high lift-to-drag ratio

Inactive Publication Date: 2009-11-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, at present, the positive temperature coefficient thermistor (PTCR) ceramic material is generally prepared by solid-state reaction. Due to the uneven distribution of components in the solid-state reaction, it is easy to be polluted by impurities, and the sintering temperature is generally higher than 1200 ° C, which consumes a lot of energy. High, making it very difficult to co-fire between the ceramic layer and the electrode when making the laminate

Method used

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  • Preparation method of barium strontium titanate semiconductive ceramics
  • Preparation method of barium strontium titanate semiconductive ceramics
  • Preparation method of barium strontium titanate semiconductive ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Y-BaTiO 3 Powder preparation steps:

[0022] Mole ratio 1mol (Ba 0.75 Sr 0.25 ) Ti 1.02 o 3 +0.4mol%Y 2 o 3 +0.04mol%Mn(NO 3 ) 2 Configure pure BaCO 3 , SrCO 3 、TiO 2 , Y 2 o 3 The powder is ball milled with distilled water for 4 hours, dried, crushed, sieved, sintered at 1200°C, and kept for 3 hours to obtain barium strontium titanate powder;

[0023] (2) Preparation steps of glass sintering aid:

[0024] 0.5mol BaCO in molar ratio 3 +1mol H 3 BO 3 +2mol% SiO 2 , weigh BaCO 3 、H 3 BO 3 , SiO 2 Powder and Mn(NO 3 ) 2 solution, with ZrO 2 Ball mill the mixture for 4 hours, dry, pulverize, and sieve, then put the mixed powder into a corundum crucible, heat it to 1100°C at a heating rate of 5°C / min, keep it warm for 60 minutes, pour it into water to quench, and get The glass frit was milled with ZrO2 balls for 4 hours, dried at 80°C, crushed and sieved to obtain glass powder;

[0025] (3) Preparation steps of PTCR ceramics

[0026] Add the gl...

Embodiment 2

[0028] (1) Y-BaTiO 3 Powder preparation steps:

[0029] Mole ratio 1mol (Ba 0.75 Sr 0.25 ) Ti 1.02 o 3 +0.6mol%Y 2 o 3 Configuration analysis of pure BaCO 3 , SrCO 3 、TiO 2 , Y 2 o 3 The powder is ball milled with distilled water for 5 hours, dried, crushed, sieved, sintered at 1150°C, and kept for 3 hours to obtain barium strontium titanate powder;

[0030] (2) Preparation steps of glass sintering aid:

[0031] 0.5mol BaCO in molar ratio 3 +1mol H 3 BO 3 +5mol%SiO 2 +0.06mol%Mn(NO 3 ) 2 , weigh BaCO 3 、H 3 BO 3 , SiO 2 Powder and Mn(NO 3 ) 2 solution, with ZrO 2 Ball mill the mixture for 5 hours, dry, crush, and sieve, then put the mixed powder into a corundum crucible, heat it to 1150°C at a heating rate of 5°C / min, keep it warm for 30 minutes, pour it into water to quench, and get The glass frit is then ZrO 2 Ball milling for 4 hours, drying at 80°C, crushing and sieving to obtain glass powder;

[0032](3) Preparation steps of PTCR ceramics

[00...

Embodiment 3

[0036] (1) Y-BaTiO 3 Powder preparation steps:

[0037] Mole ratio 1mol (Ba 0.70 Sr 0.30 ) Ti 1.01 o 3 +0.8mol%Y 2 o 3 Configuration analysis of pure BaCO 3 , SrCO 3 、TiO 2 , Y 2 o 3 The powder is ball milled with distilled water for 6 hours, dried, crushed, sieved, sintered at 1250°C, and kept for 2 hours to obtain barium strontium titanate powder;

[0038] (2) Preparation steps of glass sintering aid:

[0039] 0.5mol BaCO in molar ratio 3 +1mol H 3 BO 3 +8mol%SiO 2 , weigh BaCO 3 、H 3 BO 3 , SiO 2 Powder and Mn(NO 3 ) 2 solution, with ZrO 2 Ball mill the mixture for 6 hours, dry, pulverize, and sieve, then put the mixed powder into a corundum crucible, heat it to 1150°C at a heating rate of 5°C / min, keep it warm for 10 minutes, pour it into water to quench, and get The glass frit is then ZrO 2 Ball milling for 6 hours, drying at 100°C, crushing and sieving to obtain glass powder;

[0040] (3) Preparation steps of PTCR ceramics

[0041] Add the glass...

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Abstract

The invention provides a preparation method of barium strontium titanate semi-conductive ceramics, belonging to the preparation method of a positive temperature coefficient (PTC) ceramic material. The ceramic material with better PTCR effect is sintered and prepared at low temperature direct towards the problems existing in the prior preparation method. The preparation method of barium strontium titanate semi-conductive ceramics comprises: (1) Y-BaTiO3 powder preparation step; (2) PTCR ceramics preparation step. The glass sintering additive is added into the formula and Mn(NO3)2 solution is added into the glass sintering additive to make the addition of the manganese more easy and the eduction loss and irregular mixing problem are effectively improved and the sintering temperature of the material is reduced and the material PTC effect is reinforced. The prepared PTCR ceramics has lower room temperature resistivity, higher lift-drag ratio and good synthesized PTCR performance and is favorable for lamination and in accordance with the requirement of thermistor production.

Description

technical field [0001] The invention belongs to a preparation method of a positive temperature coefficient (PTC) ceramic material, in particular to a preparation method of strontium barium titanate semiconductor ceramics. Background technique [0002] With the rapid development of science and technology, the miniaturization, multi-function, integration and high reliability of electronic components have become the mainstream of today's electronic technology development, especially the modern surface mount technology (SMT), which further stimulates the development of electronic components. Chip type, its demand and output are increasing, and one of the components with a large amount is the thermal sensor of chip ceramic material. [0003] The existing positive temperature coefficient thermistor (PTCR) ceramic materials mainly refer to BaTiO 3 Ceramic, pure BaTiO 3 Ceramics are insulators, and when they are doped with trace rare earth elements, the resistivity of ceramic mate...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/468
Inventor 姜胜林涂文芳龚树萍曾亦可孔明日
Owner HUAZHONG UNIV OF SCI & TECH
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