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Method for preparing high Curie point leadless PTC ceramic resistance material

A technology of ceramic resistors and mixtures, applied to ceramics, resistors with positive temperature coefficients, inorganic insulators, etc., to achieve the effect of avoiding pollution and solving technical problems

Inactive Publication Date: 2008-07-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no reports of successful research on lead-free and bismuth-containing PTC ceramic materials with a high Curie point at home and abroad. Only a few universities in Japan have carried out related research work, while my country is still in the early stages of development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: first by mass parts the Na of 26.2 parts 2 CO 3 , 116.5 Bi 2 o 3 and 79.9 parts of TiO 2 Mixed to obtain mixture A; then by mass parts 79.9 parts of TiO 2 and 197.4 parts of BaCO 3 Mix to obtain mixture B, then add mixture A and mixture B to deionized water for ball milling for 5 hours, filter and dry the ball-milled powder at 100°C; then heat the dried mixture A at 800°C for 2 hours to synthesize Na 0.5 Bi 0.5 TiO 3 Powder, the dried mixture B was kept at 1280°C for 2 hours to synthesize BaTiO 3 powder; the synthesized Na 0.5 Bi 0.5 TiO 3 Powder, BaTiO 3 Powder, semiconducting elements La and TiO 2 According to (Na 0.5 Bi 0.5 ) 0.002 (Ba 0.098 )TiO 3 +0.9La+2mol%TiO 2 , after proportioning, ball milling, drying, granulation, forming green body; sintering the formed green body in reducing atmosphere, passing hydrogen in the tube atmosphere furnace to ensure the negative pressure reducing atmosphere in the furnace, from room temperature to...

Embodiment 2

[0010] Embodiment 2: first by mass parts the Na of 26.2 parts 2 CO 3 , 116.5 Bi 2 o 3 and 79.9 parts of TiO 2 Mixed to obtain mixture A; then by mass parts 79.9 parts of TiO 2 and 197.4 parts of BaCO 3 Mix to obtain mixture B, then add mixture A and mixture B to deionized water for ball milling for 4 hours, filter and dry the ball-milled powder at 94°C; then heat the dried mixture A at 830°C for 1.8 hours to synthesize Na 0.5 Bi 0.5 TiO 3 Powder, the dried mixture B was kept at 1300°C for 1.7 hours to synthesize BaTiO 3 powder; the synthesized Na 0.5 Bi 0.5 TiO 3 Powder, BaTiO 3 Powder, semiconducting elements Nb and TiO 2 According to (Na 0.5 Bi 0.5 ) 0.005 (Ba 0.595 )TiO 3 +0.4Nb+2mol%TiO 2 , after proportioning, ball milling, drying, granulation, forming green body; sintering the formed green body in reducing atmosphere, passing hydrogen in the tube atmosphere furnace to ensure the negative pressure reducing atmosphere in the furnace, from room temperature...

Embodiment 3

[0011] Embodiment 3: first by mass parts the Na of 26.2 parts 2 CO 3 , 116.5 Bi 2 o 3 and 79.9 parts of TiO 2 Mixed to obtain mixture A; then by mass parts 79.9 parts of TiO 2 and 197.4 parts of BaCO 3 Mix to obtain mixture B, then add mixture A and mixture B to deionized water for ball milling for 3 hours, filter and dry the ball-milled powder at 86°C; then heat the dried mixture A at 850°C for 1 hour to synthesize Na 0.5 Bi 0.5 TiO 3 Powder, the dried mixture B was kept at 1330°C for 1.3 hours to synthesize BaTiO 3 powder; the synthesized Na 0.5 Bi 0.5 TiO 3 Powder, BaTiO 3 Powder, semiconducting element Y and TiO 2 According to (Na 0.5 Bi 0.5 ) 0.007 (Ba 0.293 )TiO 3 +0.7, 0.1Y+2mol%TiO 2 , after proportioning, ball milling, drying, granulation, forming green body; sintering the formed green body in reducing atmosphere, passing hydrogen in the tube atmosphere furnace to ensure the negative pressure reducing atmosphere in the furnace, from room temperature ...

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Abstract

A preparation method of a lead-free high-Curie temperature PTC varistor ceramic material, the Na2Co3, Bi2O3 and TiO2 are mixed into a compound A while the TiO2 and BaCO3 are mixed into a compound B, the Na0.5Bi0.5TiO3 powder and the BaTiO3 powder are synthesized respectively through ball milling of the compound A and B; the synthesis Na0.5Bi0.5TiO3 powder and BaTiO3 powder, the semi-derived element and the TiO2 are ball milled, dried, granulated, and molded; the body molded is sintered to obtain a semi-derived ceramic sample which is oxidized for the lead-free high-curie temperature PTC varistor ceramic material. The invention fulfills unleaded requirements, avoids environmental pollution and human harm caused by lead application in manufacturing of resistance material, and solves the technical difficulties for the semi-derived lead-free high-curie temperature PTC varistor ceramic material.

Description

technical field [0001] The invention relates to a preparation method of a ceramic resistance material, in particular to a preparation method of a lead-free PTC ceramic resistance material with a high Curie point. Background technique [0002] PTCR (Positive Temperature Coefficient Resistivity positive temperature coefficient resistance) ceramic materials have been widely used in heating at constant temperature, degaussing of color TVs and color displays, as temperature compensation components of circuits, starting of asynchronous motors, delayed starting of lighting fixtures, motors Overcurrent and overheating protection, communication circuit overcurrent protection, etc. In addition, as a self-temperature-controlling heating element, especially a high Curie point (T C ) The demand for high-power PTCR heating elements in household appliances will grow at a rate of 27% per year. [0003] At present, domestic and foreign to high T C There are three main systems in the resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/00H01B3/12H01C7/02
Inventor 蒲永平王瑾菲
Owner SHAANXI UNIV OF SCI & TECH
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