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Process for preparing heat-generating PTC ceramics

A technology of ceramic heating elements and monomers, applied in the preparation of BaTiO3-based PTC ceramic heating elements, and in the field of preparation of ceramic heating elements

Inactive Publication Date: 2004-09-01
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a ceramic heating element, which applies the gel injection molding process to the preparation of complex shaped BaTiO 3 Based on PTC ceramic heating element, to overcome the existing deficiencies in the preparation of ceramic heating elements by hot pressing injection molding and extrusion molding methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Raw material pre-burning treatment: the BaCO 3 , PbO, TiO 2 , Nb 2 o 5 , SiO 2 , Mn(NO 3 ) 2 Press (Ba 0.7 Pb 0.3 ) Ti 1.01 o 3 +2mol% SiO 2 +0.15mol%Nb 2 o 5 +0.03mol%Mn(NO 3 ) 2 After measuring 1000g of ball mill and mixing, heat preservation at 1150° C. for 2 hours for pre-calcination synthesis, and then ball mill the calcined material for 36 hours to obtain calcined powder.

[0020] (2) Slurry preparation: 16 ml of 10% ammonium polymethacrylate (pH value 9), 9.2 g of acrylamide, and 0.4 g of methylenebisacrylamide were added to 54 ml of water, and stirred evenly to obtain a premix. Add 373g of calcined powder and 1ml of n-octanol to the premixed liquid, and ball mill and mix for 12 hours to obtain a slurry.

[0021] (3) Injection molding: After degassing the slurry under vacuum, add 5 drops of tetramethylethylenediamine and 8 drops of 3% ammonium persulfate aqueous solution in turn while stirring, and slowly pour the slurry into the honeycomb cera...

Embodiment 2

[0025] (1) Pre-burning treatment of raw materials: BaTiO 3 , PbO, TiO 2 , Nb 2 o 5 、Al 2 o 3 , SiO 2 , Mn(NO 3 ) 2 Press (Ba 0.8 Pb 0.2 ) Ti 1.01 o 3 +2mol% SiO 2 +1mol% Al 2 o 3 +0.15mol%Nb 2 o 5 +0.03mol%Mn(NO 3 ) 2 After measuring 1000g of ball mill and mixing, heat preservation at 1170° C. for 2 hours for pre-calcination synthesis, and then ball mill the calcined material for 36 hours to obtain calcined powder.

[0026] (2) Slurry preparation: 20 ml of 10% ammonium polyacrylate (pH value 8.2), 12 g of methacrylamide, and 0.5 g of methylenebisacrylamide were added to 50 ml of water, and stirred evenly to obtain a premix. Add 420 g of calcined powder into the premix, and ball mill and mix for 20 hours to obtain a slurry.

[0027] (3) Injection molding: After degassing the slurry under vacuum, add 8 drops of tetramethylethylenediamine and 4 drops of 5% ammonium persulfate aqueous solution in turn while stirring, and slowly pour the slurry into the honeycomb...

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Abstract

A process for preparing the heating body of PTC ceramics includes proportioning raw materials, mixing, grinding, prefiring at 1100-1200 deg.C, cooling, ball grinding, mixing the powder with liquid mixture and defoaming agent to obtain slop, adding tetramethylethylene diamine as catalyst and the aqueous solution of ammonium persulfate as initiator, injection moulding, drying, removing organic substance and firing. Its advantage is high percentage of finished products.

Description

technical field [0001] The invention belongs to the technical field of ceramic preparation, in particular, it relates to a preparation method of a ceramic heating element, especially BaTiO with complex shape 3 A preparation method of a PTC-based ceramic heating element. Background technique [0002] Currently, BaTiO with complex shapes 3 PTC-based ceramic heating elements, such as honeycomb heating elements, are mainly prepared by hot press injection molding and extrusion molding processes. These two molding processes have the following disadvantages: a large amount of organic binder and plasticizer must be used respectively during molding; the removal period of binder and plasticizer is long and the energy consumption is high; when the binder and plasticizer are removed, The ceramic body is easily deformed, cracked, and collapsed, and the scrap rate is high. [0003] USP5028362, CN1237564A, CN1246465A, CN1263812A, CN1272473A, etc. provide a method for forming ceramics by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 周东祥胡云香龚树萍黎步银
Owner HUAZHONG UNIV OF SCI & TECH
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