Preparing method for lead-free positive temperature coefficient thermistor ceramic

The invention relates to a preparing method for lead-free positive temperature coefficient thermistor ceramic which is sintered under the air atmosphere and has a high Curie temperature, a high liftdrag ratio and low room-temperature resistivity. The formula x(Bi1/2Na1/2)TiO3-yCaTiO3-(1-x-y) BaTiO3+...

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Hauptverfasser:	NIU WEIJIAN, LI CHEN, JIANG YIYANG, ZHU XINGWEN, REN HUIRU, ZHOU XIAO, JIANG WENZHONG
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ARTIFICIAL STONE BASIC ELECTRIC ELEMENTS CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE ELECTRICITY LIME, MAGNESIA METALLURGY REFRACTORIES RESISTORS SLAG TREATMENT OF NATURAL STONE
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creator	NIU WEIJIAN LI CHEN JIANG YIYANG ZHU XINGWEN REN HUIRU ZHOU XIAO JIANG WENZHONG
description	The invention relates to a preparing method for lead-free positive temperature coefficient thermistor ceramic which is sintered under the air atmosphere and has a high Curie temperature, a high liftdrag ratio and low room-temperature resistivity. The formula x(Bi1/2Na1/2)TiO3-yCaTiO3-(1-x-y) BaTiO3+a Li2CO3+bSb2O3 powder is adopted in the method, wherein x=0.01-0.12, y=0-0.20, a=0-0.5 mol%, b=0-0.20 mol%, one or more of Nb2O5, La2O3, Sm2O3 and Nd2O3 compounds serve as a semi-conductive agent, and Al2O3 and TiO2 serve as a sintering aid. An adopted technology comprises the steps that round sheets pressed with the materials are sintered after heat preservation is carried out for 10-30 min at 1250-1380 DEG C in the air atmosphere, are fully sintered and achieve a solid-phase reaction; the surfaces of the sintered round sheets are polished, electrodes are applied, and the PTCR ceramic material is obtained. According to the ceramic material, the room-temperature resistivity is as low as 30 ohm.cm, the Curie temper
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The formula x(Bi1/2Na1/2)TiO3-yCaTiO3-(1-x-y) BaTiO3+a Li2CO3+bSb2O3 powder is adopted in the method, wherein x=0.01-0.12, y=0-0.20, a=0-0.5 mol%, b=0-0.20 mol%, one or more of Nb2O5, La2O3, Sm2O3 and Nd2O3 compounds serve as a semi-conductive agent, and Al2O3 and TiO2 serve as a sintering aid. An adopted technology comprises the steps that round sheets pressed with the materials are sintered after heat preservation is carried out for 10-30 min at 1250-1380 DEG C in the air atmosphere, are fully sintered and achieve a solid-phase reaction; the surfaces of the sintered round sheets are polished, electrodes are applied, and the PTCR ceramic material is obtained. 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The formula x(Bi1/2Na1/2)TiO3-yCaTiO3-(1-x-y) BaTiO3+a Li2CO3+bSb2O3 powder is adopted in the method, wherein x=0.01-0.12, y=0-0.20, a=0-0.5 mol%, b=0-0.20 mol%, one or more of Nb2O5, La2O3, Sm2O3 and Nd2O3 compounds serve as a semi-conductive agent, and Al2O3 and TiO2 serve as a sintering aid. An adopted technology comprises the steps that round sheets pressed with the materials are sintered after heat preservation is carried out for 10-30 min at 1250-1380 DEG C in the air atmosphere, are fully sintered and achieve a solid-phase reaction; the surfaces of the sintered round sheets are polished, electrodes are applied, and the PTCR ceramic material is obtained. 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The formula x(Bi1/2Na1/2)TiO3-yCaTiO3-(1-x-y) BaTiO3+a Li2CO3+bSb2O3 powder is adopted in the method, wherein x=0.01-0.12, y=0-0.20, a=0-0.5 mol%, b=0-0.20 mol%, one or more of Nb2O5, La2O3, Sm2O3 and Nd2O3 compounds serve as a semi-conductive agent, and Al2O3 and TiO2 serve as a sintering aid. An adopted technology comprises the steps that round sheets pressed with the materials are sintered after heat preservation is carried out for 10-30 min at 1250-1380 DEG C in the air atmosphere, are fully sintered and achieve a solid-phase reaction; the surfaces of the sintered round sheets are polished, electrodes are applied, and the PTCR ceramic material is obtained. According to the ceramic material, the room-temperature resistivity is as low as 30 ohm.cm, the Curie temper</abstract><oa>free_for_read</oa></addata></record>
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subjects	ARTIFICIAL STONE BASIC ELECTRIC ELEMENTS CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE ELECTRICITY LIME, MAGNESIA METALLURGY REFRACTORIES RESISTORS SLAG TREATMENT OF NATURAL STONE
title	Preparing method for lead-free positive temperature coefficient thermistor ceramic
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