Sol-gel preparation method of barium titanate PTC ceramics

The technology of sol-gel and barium titanate is applied in the field of preparation of electronic ceramic components, which can solve the problem of not meeting the low room temperature resistivity and other problems, and achieve the effects of favoring grain boundary oxidation, small grain size and high solid content.

Inactive Publication Date: 2010-07-21
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

South Korea's Jun-Gyu Kim et al. added 4wt.% to 10wt.% of partially oxidized TiO to barium titanate powder 2 , by pressing and sintering at 1350 ° C, a ceramic sheet with a grain size of 1 μm to 1.3 μm and a PTC effect lift-to-drag ratio of 4 to 6 was prepared, but its room temperature resistivity was 1.5×10 4 Ω·cm~1.74×10 4 Ω cm, does not meet the requirements of low room temperature resistivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Press (Ba 0.99 Y 0.01 )TiO 3 , that is, according to the formula (Ba 1-x Y x )TiO 3 , make x=10‰, weigh 0.198molBa (CH 3 COO) 2 , 0.002mol Y (NO 3 ) 3 ·6H 2 O and 0.2mol Ti(OC 4 H 9 ) 4 . Dissolve Ba(CH) with 0.134L of deionized water 3 COO) 2 and Y(NO3) 3 ·6H 2 O is doped with Y(NO3) 3 ·6H 2 The concentration of O is 1.48mol / L Ba(CH 3 COO) 2 solution, pour 0.05L of acetic acid and 0.14L of anhydrous ethanol into the solution containing Ti(OC 4 H 9 ) 4 Ti(OC) with a concentration of 1.05mol / L was obtained in the beaker of 4 H 9 ) 4 solution. Mix the obtained with Y(NO3) 3 ·6H 2 O Ba(CH 3 COO) 2 The solution was slowly dripped into the Ti(OC 4 H 9 ) 4 solution, while vigorously stirring Ti(OC 4 H 9 ) 4 solution, the resulting mixed solution. The mixed solution was allowed to stand at room temperature for 12h to obtain the sol, and then the sol was dried at 90°C for 24h to obtain the gel. The gel was mashed, ground, sieved, and then p...

Embodiment 2

[0028] Press (Ba 0.984 Y 0.016 )TiO 3 , that is, according to the formula (Ba 1-x Yx )TiO 3 , make x=16‰, weigh 0.197molBa (CH 3 COO) 2 , 0.032molY(NO3) 3 ·6H 2 O and 0.2mol Ti(OC 4 H 9 ) 4 . Dissolve Ba(CH) with 0.134L of deionized water 3 COO) 2 and Y(NO3) 3 ·6H 2 O is doped with Y(NO3) 3 ·6H 2 The concentration of O is 1.47mol / L Ba(CH 3 COO) 2 solution, pour 0.05L of acetic acid and 0.14L of anhydrous ethanol into the solution containing Ti(OC 4 H 9 ) 4 Ti(OC) with a concentration of 1.05mol / L was obtained in the beaker of 4 H 9 ) 4 solution. Mix the obtained with Y(NO3) 3 ·6H 2 O Ba(CH 3 COO) 2 The solution was slowly dripped into the Ti(OC 4 H 9 ) 4 solution, while vigorously stirring Ti(OC 4 H 9 ) 4 solution, the resulting mixed solution. The mixed solution was allowed to stand at room temperature for 12h to obtain the sol, and then the sol was dried at 90°C for 24h to obtain the gel. The gel was mashed, ground, sieved, and then pre-fi...

Embodiment 3

[0033] Press (Ba 0.984 Y 0.016 )TiO 3 , that is, according to the formula (Ba 1-x Y x )TiO 3 , make x=16‰, weigh 0.197molBa (CH 3 COO) 2 , 0.032molY(NO3) 3 ·6H 2 O and 0.2mol Ti(OC 4 H 9 ) 4 . Dissolve Ba(CH) with 0.134L of deionized water 3 COO) 2 and Y(NO3) 3 ·6H 2 O is doped with Y(NO3) 3 ·6H 2 The concentration of O is 1.47mol / L Ba(CH 3 COO) 2 solution, pour 0.05L of acetic acid and 0.14L of anhydrous ethanol into the solution containing Ti(OC 4 H 9 ) 4 Ti(OC) with a concentration of 1.05mol / L was obtained in the beaker of 4 H 9 ) 4 solution. Mix the obtained with Y(NO3) 3 ·6H 2 O Ba(CH 3 COO) 2 The solution was slowly dripped into the Ti(OC 4 H 9 ) 4 solution, while vigorously stirring Ti(OC 4 H 9 ) 4 solution, the resulting mixed solution. The mixed solution was allowed to stand at room temperature for 12h to obtain the sol, and then the sol was dried at 90°C for 24h to obtain the gel. The gel was mashed, ground, sieved, and then pre-...

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Abstract

The invention discloses a sol-gel preparation method of barium titanate PTC ceramics, which comprises the following steps that: (1) the materials are measured according to the formula (Ba1-xYx)TiO3, and x is equal to 6 to 20 permillage, barium acetate water solution with the concentration of 1.3 to 1.6 mol/L is prepared, and tetrabutyl titanate solution with the concentration of 1.0 to 1.3 mol/L is prepared; (2) Y(NO3)3.6H2O is incorporated into the Ba(CH3COO)2 water solution, and then the mixed solution is dropped into the Ti(OC4H9)4 solution to obtain the mixed solution; (3) the mixed solution is held at the room temperature to obtain the sol, and the sol is dried to obtain the gel; (4) the gel is smashed, ground and sieved to be pre-burned to synthesize the BaTiO3 powder containing yttrium; (5) the BaTiO3 powder containing the yttrium, the BaCO3 and the BN are measured according to the mol ratio of 1: (0.02 to 0.03) : (0.04 to 0.06) and are mixed and ball milled after being added with deionized water; (6) the BaTiO3 powder containing glass-phase raw material is ball milled with solvent and dispersant, and then the obtained mixture is ball milled with bond and plasticizer to obtain sizing agent for curtain containing; (7) the sizing agent is formed in a curtain coating way; and (8) and flakes are sliced and sintered to obtain the ceramic piece. The prepared PTC ceramic has the advantages of small crystal grains, small room-temperature resistivity and large PTC effect.

Description

technical field [0001] The invention belongs to the technical field of preparation of electronic ceramic components, in particular to a sol-gel preparation method of barium titanate PTC ceramics, in particular to a preparation method of fine-grained barium titanate PTC ceramics used in laminated PTC thermistors. Background technique [0002] At present, with the development of miniaturization of electronic components, the multi-layer chip PTC thermistor has been widely studied. In order to further miniaturize electronic components, the thickness of the PTC ceramic sheet used in the laminated chip PTC thermistor is further reduced to several tens of μm. In order to ensure the withstand voltage performance of PTC electronic components, the grain size of the laminated PTC ceramic sheet should also be reduced accordingly, so that the number of grain boundaries in the PTC ceramic sheet increases. The physical mechanism of conduction of PTC ceramic thermal components is the joint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/624C04B35/468
Inventor 周东祥龚树萍傅邱云胡云香郑志平刘剑桥邓钊洁
Owner HUAZHONG UNIV OF SCI & TECH
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