Microstructures and PTC-Mechanism in Pb TiO_3-TiO_2 PTC Ceramics for High Temperature Applications
高温应用 Pb TiO_3-TiO_2 PTC 陶瓷的微观结构和 PTC 机制
基本信息
- 批准号:01550542
- 负责人:
- 金额:$ 1.73万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (C)
- 财政年份:1989
- 资助国家:日本
- 起止时间:1989 至 1991
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The purpose of the present studies is to establish the preparation techniques of PbTiO_3-TiO_2 ceramics as PTC thermistors, and to clarify the PTCR mechanisms. The obtained results are summarized as follows ;1. Optimum conditions of preparing techniques are established. Optimum compositions are PbTiO_3-(30-80)mol%TiO_2, and which are fired at 975゚C-1025゚C for 2 hr in Ar atmosphere.2. Heating temperatures of the thermistors can be controlled by lowering the Curie temperature. of the system with the addition-of SrTiO_3. For an example, the Curie temperatures of the samples with 30%SrTiO_3 addition, is around 350゚C.3. The addition of oxides of transition metals increased the PTCR properties, and furthermore improved their stabilities.4. Present studies find that the PTCR properties are originated not only from the interfaces of ferroelectric PbTiO_3 grains, but also interfaces of PbTiO_3 and TiO_2 grains. This results are obtained by the direct - observations of temperature resistivities properties on the samples where Pt electrodes are connected with the coarse grains of PbTiO_3 and TiO_2.The atmosphere for resistivity-temperature measurement affects PTCR properties, which are disappeared with vacuum atmosphere. Then the oxygen plays important role in originating the PITCR properties.
本研究旨在建立PbTiO_3-TiO_2系PTC热敏陶瓷的制备工艺,并阐明其PTCR机理。所得结果总结如下:1.确定了最佳制备工艺条件。最佳组成为PbTiO_3-(30-80)mol%TiO_2,在Ar气氛中于975 ℃-1025 ℃烧成2小时.可以通过降低居里温度来控制热敏电阻的加热温度。SrTiO_3的加入对体系的稳定性有一定的影响。例如,添加30%SrTiO_3的样品的居里温度约为350 ℃。过渡金属氧化物的加入提高了PTCR的性能,并进一步改善了其稳定性.研究发现,PTCR性能不仅来源于PbTiO_3晶粒间的界面,还来源于PbTiO_3和TiO_2晶粒间的界面。这一结果是通过直接观测Pt电极与PbTiO_3和TiO_2粗颗粒相连接的样品的温度电阻率特性得到的。电阻率-温度测量气氛对PTCR特性有影响,但在真空气氛下这种影响消失。氧在PITCR性能的形成中起着重要的作用。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
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OKADA Masuo其他文献
OKADA Masuo的其他文献
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{{ truncateString('OKADA Masuo', 18)}}的其他基金
Improvements of properties of Cu-based alloys by aging in hydrogen atmosphere in being associated with new precipitation mode
氢气氛中时效与新沉淀模式相关的铜基合金性能的改善
- 批准号:
23246123 - 财政年份:2011
- 资助金额:
$ 1.73万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Development of new techniques of grain-size refinements and their properties for Al-based and Cu-based alloys by hydrogen processing function
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17206069 - 财政年份:2005
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$ 1.73万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
High Pressure Synthesis of Novel Hydrides with High Hydrogen Content for Fuel Cell Vehicle
高压合成燃料电池汽车用高氢含量新型氢化物
- 批准号:
14350364 - 财政年份:2002
- 资助金额:
$ 1.73万 - 项目类别:
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New Protium Function in Sub-Nano Materials
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- 批准号:
10148102 - 财政年份:1998
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$ 1.73万 - 项目类别:
Grant-in-Aid for Scientific Research on Priority Areas
New Materials with High Protium Content
高氕含量新材料
- 批准号:
10148104 - 财政年份:1998
- 资助金额:
$ 1.73万 - 项目类别:
Grant-in-Aid for Scientific Research on Priority Areas (A)
Industrialization of New PTCR Materials Based on a Ceramics Matrix with a Dispersion of Bi Metal Particles as Ceramic Heaters
基于双金属颗粒分散陶瓷基体的新型PTCR材料作为陶瓷加热器的产业化
- 批准号:
09555203 - 财政年份:1997
- 资助金额:
$ 1.73万 - 项目类别:
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UTILITY TEST ON PROLONGING LIFE TIME OF HYDRIDE BATTERY WITH NANO-CRYSTALLIZED RARE-EARTH JYDROGEN ABSORBING ALLOYS
纳米晶稀土吸氢合金延长氢化物电池寿命的实用试验
- 批准号:
07555209 - 财政年份:1995
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$ 1.73万 - 项目类别:
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PTCR MECHANISM IN NEWLY DEVELOPED Bi_4Ti_3O_<12> CERAMIC HEATER
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- 批准号:
05650666 - 财政年份:1993
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$ 1.73万 - 项目类别:
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