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Nb2O5 doped BaTiO3 substrate-type PTC thermal sensitive ceramic and preparation method thereof

A heat-sensitive ceramic and substrate technology, which is applied in the field of Nb2O5-doped BaTiO3-based PTC heat-sensitive ceramics and its preparation, can solve the problems of low lift-to-drag ratio, achieve low room temperature resistance, widen the semiconducting range, and The effect of lift-to-drag ratio

Inactive Publication Date: 2018-11-13
ZHAOQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem that the lift-to-drag ratio is not high in this study

Method used

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  • Nb2O5 doped BaTiO3 substrate-type PTC thermal sensitive ceramic and preparation method thereof
  • Nb2O5 doped BaTiO3 substrate-type PTC thermal sensitive ceramic and preparation method thereof
  • Nb2O5 doped BaTiO3 substrate-type PTC thermal sensitive ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) BaTiO 3 Preparation of substrate-type PTC heat-sensitive material powder

[0025] BaTiO 3 The composition of the substrate-type PTC thermosensitive material is according to the following formula:

[0026] Ba m (Ti 1-x Nb x )O 3 + y SiO 2 , where m = 0.994, 0.997, 1.000, 1.003, 1.006, 1.012, 1.018mol; x = 0.35mol%; y = 0.05mol%. The corresponding samples were labeled with SP1, SP2, SP3, SP4, SP5, SP6 and SP7, respectively. Weigh the BaCO in turn according to the proportion of the above formula 3 , SiO 2 , Nb 2 o 5 and TiO 2 , the purity of these substances should also be considered when weighing. BaCO 3 , SiO 2 , Nb 2 o 5 and TiO 2 The purity calibration methods are: high temperature deduction method, gravimetric method, high temperature deduction method and redox titration method, and their corresponding purities are: 99.8%, 99.99%, 99.99% and 99.8%. ZrO 2The ball is used as the ball milling medium, and an appropriate amount of deionized water...

Embodiment 2

[0040] (1) BaTiO 3 Preparation of substrate-type PTC heat-sensitive material powder

[0041] Based on Example 1, we can conclude that m When being 1.006, the sheet sample can obtain better PTC characteristics, so, the composition of the sample of the present invention is according to the following formula Ba m (Ti 1-x Nb x )O 3 + y SiO 2 ,in m = 1.006 mol; x = 0.35mol%; y = 0.05 mol%. Corresponding samples were labeled with SP5. Weigh the BaCO in turn according to the proportion of the above formula 3 , SiO 2 , Nb 2 o 5 and TiO 2 , with ZrO 2 The ball was used as the ball milling medium, and an appropriate amount of deionized water was added, and the weighed mixture was put into a high-energy ball mill for ball milling and mixing for 90 min, and the speed of the ball mill was 2400 rpm. Put the ball-milled slurry into an oven at 115°C to dry for 16-18 hours. After drying, put the powder passed through a 45-mesh sieve into a crucible, squeeze it firmly with...

Embodiment 3

[0055] (1) BaTiO 3 Preparation of substrate-type PTC heat-sensitive material powder

[0056] Based on example 1 and example 2, the composition of the sample of the present invention is according to the following formula Ba m (Ti 1-x Nb x )O 3 + y SiO 2 ,in m = 1.006 mol; x = 0.35 mol%; y = 0.05 mol%. Corresponding samples were labeled with SP5. Weigh the BaCO in turn according to the proportion of the above formula 3 , SiO 2 , Nb 2 o 5 and TiO 2 , with ZrO 2 The ball was used as the ball milling medium, and an appropriate amount of deionized water was added, and the weighed mixture was put into a high-energy ball mill for ball milling and mixing for 90 min, and the speed of the ball mill was 2400 rpm. Put the ball-milled slurry into an oven at 115°C to dry for 16 to 18 hours. After drying, put the powder that has passed through a 45-mesh sieve into a crucible, squeeze it firmly with a round lid of the crucible, and then use a fine glass Punch 7 small holes...

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Abstract

The invention provides a Nb2O5 doped BaTiO3 substrate-type PTC thermal sensitive ceramic and a preparation method thereof. The constituent chemical formula of a sample is Bam(Ti1-xNbx)O3 and ySiO2, wherein m is equal to 0.994 mol%-1.018 mol%, x is equal to 0.2 mol%-0.8 mol%, y is equal to 0.01 mol%-0.10 mol%. A Nb2O5 doped BaTiO3 substrate-type PTC green body is prepared by adopting a wet-processcasting technology, a substrate-type PTC thermal sensitive ceramic is prepared by adopting a reducing-reoxidizing co-sintering technology, Nb2O5 is introduced to be used as a donor dopant by adoptinga B-bit donor replacing method to perform the doping modification and performance optimization of the sample to obtain a substrate-type PTC thermistor with relatively low resistance, sintering in a reducing atmosphere facilitates widening the semi-conducted interval of a main dopant, a substrate-type PTC thermal sensitive ceramic with high partial stoichiometric ratio (Ba / Ti ratio is within 1.003-1.006) is manufactured by optimizing and regulating the stoichiometric ratio of the sample, and therefore, relatively low room temperature resistance can be obtained, relatively higher lift-drag ratiocan be obtained, and the problem that low resistance and high lift-drag ratio of the sample contradict with each other is solved.

Description

technical field [0001] The invention belongs to the technical field of functional ceramic materials, and in particular relates to Nb 2 o 5 doped BaTiO 3 Substrate-type PTC heat-sensitive ceramics and a preparation method thereof. Background technique [0002] With the rapid development of microelectronics technology and surface mount technology (SMT), the development of electronic ceramic materials and their components in the direction of miniaturization, chip and integration is promoted. At present, chip PTC heat-sensitive materials and The device has become a research hotspot, and it has been widely used in low-voltage circuits for over-current and over-heat protection. First of all, Germany's Siemens first proposed the manufacture of chip-type thermistor elements, and secondly, Japan's Murata Corporation successfully prepared multi-layer chip-type PTC thermistors and realized industrial production. However, Chinese scholars started research in this field relatively la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/468C04B35/622C04B2235/3215C04B2235/3236C04B2235/3251C04B2235/3418C04B2235/6582
Inventor 程绪信崔海宁陈晓明
Owner ZHAOQING UNIV
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