Graphite, phenolic resin, (Ba1-x-y, Srx, Pby) TiO3 based PTC thermistor and method for preparing the same

A technology of phenolic resin and thermistor, applied in the direction of resistors with positive temperature coefficient, etc., can solve the problems of high resistivity at room temperature, affecting promotion and application, and achieve the effect of reducing resistivity at room temperature

Inactive Publication Date: 2004-11-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

BaTiO 3 The low resistance of PTC-based materials is a major trend in today's development [Gene H, Haertling K. Ferroelectric ceramics: History and Technology [J]. J Am Ceram Soc, 1999, 82 (4): 797-818.], currently BaTiO 3 The room temperature resistivity of base PTC ceramic materials is relatively high, which seriously affects the promotion and application of PTC ceramic materials and devices in self-controlled heating and overcurrent protection under low voltage conditions [I-Nan Lin; Hormg-YiChan; Kuo- Shung Liu.Microwave sintering of PTCR ceramics and their electrical properties[J].Ferroelectrics Proceedings of the Tenth IEEE International Symposium on Applications of Ferroelectrics.18-21 Aug 1996.Page(s):987~990 vol 2.]

Method used

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Examples

Experimental program
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Embodiment

[0018] Embodiment: by formula is (Ba 0.9 ,Sr 0.08 , Pb 0.02 )TiO 3 +0.0641Sb 2 o 3 +0.1062Nb 2 o 5 And other small additions 0.0127MnO 2 , 0.0341Al 2 o 3 , 0.0462SiO2 2 and 0.0208TiO 2 Weigh the ingredients, use deionized water as the medium to wet the ingredients for 6 hours, dry the ball mill, mix and granulate with 5% (mass percentage) PVA solution, and then press it into a disc of φ12mm×3mm. is 30MPa. The green body is degummed, and then fired at 1250°C for 20 minutes to make a PTC ceramic fired material; or put the ball abrasive drying material in an alumina crucible and fired at 1250°C for 20 minutes to make a PTC ceramic Burning material. Then, the PTC ceramic firing material is mechanically crushed, passed through an 80-mesh sieve, ball milled for 30 minutes, taken out and dried for use. 20.1% (weight percentage) of graphite addition and 64.2% (weight percentage) of PTC ceramic ball mill drying material were prepared and mixed for 3 hours, and then slowly...

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PUM

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Abstract

The invention discloses a graphite / phenol resin / (Ba-[1-x-y], Sr-[x], Pb-[y]TiO3 based PTC thermo-sensitive resistor and its making process, wherein its raw material and ingredients are (percentage by weight), Ba[1-x-y], Sr-[x], Pb[y]TiO3 based ceramic powder 62-78%, where x=0.005-0.35, y=0.002-0.56, graphite 14-28%, 5% phenolic resins containing PVA curing agent 8-18.6%. The invention also discloses the process for preparing the thermo-sensitive resistor.

Description

technical field [0001] The present invention relates to a kind of graphite / phenolic resin / (Ba 1-x-y ,Sr x , Pb y )TiO 3 The invention discloses a base PTC thermistor and a preparation method thereof, which belong to the preparation technology of functional ceramic materials and components thereof. Background technique [0002] by BaTiO 3 Adding trace acceptor impurities (Mn, Fe or Cr, etc.) to the base PTC ceramic material can effectively increase the PTC effect (Huybrechts B, Ishizaki K, Takata M. Proposed phenomenal PTCR model and accompanying phenomenal PTCR chart[J].J Am Ceram Soc, 1994, 77(1), 286~288.), due to adding a small amount of acceptor elements in the formula at the same time, the room temperature resistivity of PTC materials will increase; if the amount of acceptor elements is limited, it will affect the material. PTC performance. BaTiO 3 The low resistance of PTC-based materials is a major trend in today's development [Gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/465C04B35/472C04B35/622H01C7/02
Inventor 曲远方杨光马卫兵
Owner TIANJIN UNIV
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