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Single donor-doped positive temperature coefficient thermal-sensitive ceramic and preparation method thereof

A technology of positive temperature coefficient and heat-sensitive ceramics, which is applied in the field of single donor-doped positive temperature coefficient heat-sensitive ceramics and its preparation, can solve the problems of low breakdown voltage, small dispersion of room temperature resistance and high breakdown voltage, etc.

Active Publication Date: 2017-08-18
汕尾比亚迪实业有限公司
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems of large dispersion of room temperature resistance and low breakdown voltage of products of the same batch and the same formula in the prior art, and provide a single-donor doped positive temperature coefficient thermosensitive ceramic and Its preparation method, the heat-sensitive ceramics of the same batch and the same formula prepared by the method can have small dispersion of resistance resistance at room temperature, high breakdown voltage and improved aging resistance

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  • Single donor-doped positive temperature coefficient thermal-sensitive ceramic and preparation method thereof

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[0016] The first aspect of the present invention provides a method for preparing a single-donor-doped positive temperature coefficient thermosensitive ceramic, the method comprising the following steps:

[0017] (1) BaTiO 3 , PbTiO 3 、TiO 2 and Nb 2 o 5 Carry out the first mixing and the first sintering to obtain the formula Ba 1- x Pb x TiO 3 The mixed powder of lead barium titanate;

[0018] (2) the mixed powder, SiO 2 Performing second mixing and second sintering with manganese source to obtain single donor doped positive temperature coefficient thermosensitive ceramics;

[0019]Among them, BaTiO 3 and PbTiO 3 The dosage satisfies the general formula Ba 1-x Pb x TiO 3 x in 0.15 ~ 0.25, and relative to 100mol of Ba 1-x Pb x TiO 3 ,TiO 2 The dosage is 1~2mol, Nb 2 o 5 The dosage is 0.08~0.1mol, SiO 2 The dosage is 1~3mol, MnO 2 The dosage is 0.04~0.08mol.

[0020] Preferably, the general formula Ba 1-x Pb x TiO 3 x in is 0.16 to 0.24. The prepared s...

Embodiment 1

[0046] (1) Add 120 parts by weight of distilled water (barium titanate, lead titanate, titanium dioxide, The weight ratio of the total amount of diniobium to water is 1:1.2) after ball milling for 4 hours (the diameter of the grinding ball is 4mm, and the weight ratio to water is 1:0.5), and dried at 100°C, it is a premixed powder. The particle diameter is 2 μm;

[0047] The premixed powder is sintered for the first time. The sintering procedure is to heat from room temperature to 1150 °C at a heating rate of 5 °C / min, and keep it for 2 hours; Mixed powder of lead barium acid. Among them, the general formula of barium lead titanate is Ba 1-x Pb x TiO 3 , x is 0.16;

[0048] (2) According to 100 parts by weight of mixed powder, 0.8 parts by weight of silicon dioxide, the concentration of 8.5ml is 0.5% by weight of Mn(NO 3 ) 2 solution (converted to MnO 2 0.02 parts by weight).

[0049] After the mixed powder is pulverized and ground, it is sieved with a 120-mesh sieve,...

Embodiment 2

[0053] (1) Add 120 parts by weight of distilled water (barium titanate, lead titanate, titanium dioxide, The weight ratio of the total amount of diniobium to water is 1:1.2) after ball milling for 5 hours (the diameter of the grinding ball is 4mm, and the weight ratio to water is 1:0.4), and dried at 120°C, it is a premixed powder. The particle diameter is 1 μm;

[0054] The premixed powder is subjected to the first sintering. The sintering procedure is to heat from room temperature to 1100 °C at a heating rate of 3 °C / min, and keep the temperature for 1.5 h; then to cool down to room temperature at a cooling rate of 5 °C / min. Mixed powder of lead barium titanate. Among them, the general formula of barium lead titanate is Ba 1-x Pb x TiO 3 , x is 0.24;

[0055] (2) get 100 parts by weight of mixed powder, 0.8 parts by weight of silicon dioxide, and 8.5ml concentration of 0.5% by weight of Mn(NO 3 ) 2 solution (converted to MnO 2 0.02 parts by weight).

[0056] After t...

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Abstract

The invention relates to the field of single donor-doped positive temperature coefficient thermal-sensitive ceramics, and discloses a single donor-doped positive temperature coefficient thermal-sensitive ceramic and a preparation method thereof. The preparation method comprises the following steps of (1) mixing and sintering BaTiO3 (barium titanate), PbTiO3 (lead titanate), TiO2 (titanium dioxide) and Nb2O5 (niobium pentoxide) for a first time, so as to obtain BaTiO3 and PbTiO3 mixed powder with a formula of Ba1-xPbxTiO3; (2) mixing and sintering the mixed powder, SiO2 and a manganese source for a second time, so as to obtain the single donor-doped positive temperature coefficient thermal-sensitive ceramic, wherein the usage amounts of BaTiO3 and PbTiO3 meet the formula of Ba1-xPbxTiO3, and x is equal to 0.15 to 0.25; corresponding to 100mol of Ba1-xPbxTiO3, the usage amount of TiO2 is 1 to 2mol, the usage amount of Nb2O5 is 0.08 to 0.1mol, the usage amount of SiO2 is 1 to 3mol, and the usage amount of MnO2 is 0.04 to 0.08mol. The single donor-doped positive temperature coefficient thermal-sensitive ceramic has the advantages that the positive temperature coefficient thermal-sensitive ceramic can be prepared by the single donor Nb2O5 doping; under the conditions of same batch and same formula, the resistance dispersion of a room-temperature resistor of a product is small, and the breakdown voltage is high.

Description

technical field [0001] The invention relates to the field of single-donor doped positive temperature coefficient heat-sensitive ceramics, in particular to a single-donor doped positive temperature coefficient heat-sensitive ceramic and a preparation method thereof. Background technique [0002] PTC (Positive Temperature Coefficient) thermal ceramics is a ceramic with the following characteristics, that is, when the ambient temperature rises to a certain temperature (Curie temperature), the resistance value of the thermal ceramic will decrease increases by several orders of magnitude, showing a PTC effect. The thermosensitive ceramic has the advantages of temperature sensitivity, direct control, energy saving, no naked flame and safety. Due to the unique automatic "switching" functions such as thermal sensitivity, current limiting, and time delay, the ceramic has been widely used in various fields such as electronic communications, aerospace, automobile industry, and househo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/4684C04B35/622C04B2235/3232C04B2235/3251C04B2235/3267C04B2235/3418C04B2235/656C04B2235/96
Inventor 林信平周明帅邓天有王书敏温怀通
Owner 汕尾比亚迪实业有限公司
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