Novel composite conductive ceramic and method for producing the same

A composite conductive and new technology, applied in the field of materials, can solve the problems of non-adjustable, high conductive temperature, high sintering temperature, etc., and achieve the effect of adjustable resistivity, easy industrialization, and simple process

Inactive Publication Date: 2009-05-13
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these conductive ceramics have disadvantages of one kind or another, such as high conductive temperature required; high cost: need SiC, ZrO 2 Raw materials with high price; Difficult to manufacture: All materials are difficult to sinter, and the sintering temperature is high; the resistivity is fixed and cannot be adjusted (made of pure materials)

Method used

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  • Novel composite conductive ceramic and method for producing the same
  • Novel composite conductive ceramic and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 1.0196g (0.01mol) Al 2 o 3 and 4.5780g (0.01mol) La 2 (CO 3 ) 3 , Grinding and mixing with an agate mortar to obtain a precursor. Put the above precursors in a muffle furnace for sintering at 1000°C for 6 hours, then grind a little to get LaAlO3 powder.

[0020] Take 0.0063g (2.94×10 -5 mol)LaAlO 3 With 0.4503g (0.00305mol) SrCO 3 , 0.2436g (0.00305mol) TiO 2 After fully grinding and mixing in an agate mortar for 3 hours, use a tablet machine to press into a disc under a pressure of 10 MPa, put the disc in a muffle furnace, and sinter at 1200 ° C for 6 h under the protection of carbon.

[0021] The resulting product is determined by energy dispersive X-ray spectroscopy, and its composition formula is 0.009LaAlO 3 : 0.991SrTiO 3 (molar ratio), the average particle size is 1um. Its conductivity is 4.62×10 -4 S m -1 , SEM image and XRD pattern such as figure 1 with figure 2 shown. The obtained product was soaked in 1M hydrochloric acid for 2 hours, a...

Embodiment 2

[0023] Weigh 1.0196g (0.01mol) Al 2 o 3 , 3.2582g (0.01mol) La 2 o 3 , use an agate mortar to grind and mix the precursor, put the above precursor in a muffle furnace for sintering at 1000°C for 6 hours, and then grind it a little to get LaAlO 3 Powder.

[0024] Take 0.0063g (2.94×10 -5 mol)LaAlO 3 With 0.4503g (0.00305mol) SrCO 3 , 0.2436g (0.00305mol) TiO 2 After fully grinding and mixing in an agate mortar for 3 hours, use a tablet machine to press into a disc under a pressure of 10MPa, put the disc in a tube furnace, and inject H 2 Sintering at 1200°C for 6h under the same conditions.

[0025] The resulting product is determined by energy dispersive X-ray spectroscopy, and its composition formula is 0.009LaAlO 3 : 0.991SrTiO 3 (molar ratio), the average particle size is 1um. Its conductivity is 5.72×10 -4 S m -1 .

Embodiment 3

[0027] Weigh 1.0196g (0.01mol) Al 2 o 3 , 4.5780g (0.01mol) La 2 (CO 3 ) 3 , use an agate mortar to grind and mix the precursor, put the above precursor in a muffle furnace for sintering at 1000°C for 6 hours, and then grind it a little to get LaAlO 3 Powder.

[0028] Take 0.0063g (2.94×10 -5 mol)LaAlO 3 With 0.4503g (0.00305mol) SrCO 3 , 0.2436g (0.00305mol) TiO 2 After fully grinding and mixing in an agate mortar for 3 hours, use a tablet machine to press into a disc under a pressure of 10 MPa, put the disc in a muffle furnace, and sinter in air at 1200 ° C for 6 h.

[0029] The resulting product is determined by energy dispersive X-ray spectroscopy, and its composition formula is 0.009LaAlO 3 : 0.991SrTiO 3 , the average particle size is 1um. Its conductivity is 9.53×10 -6 S m -1 .

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Abstract

The invention relates to the field of materials, in particular to a conducting ceramic material, and discloses a novel composite conducting ceramic and a method for preparing the same. The constitution formula of the novel composite conducting ceramic is xLaAlO3:(1-x)SrTiO3, wherein x is a mole number of which the numerical range is between 0.001 and 0.015. The method for preparing the composite conducting ceramic comprises the following steps: grinding and mixing a strontium titanate substrate raw material with lanthanum aluminate evenly; tabletting the mixture at a pressure of between 8 and 12 MPa; and baking the mixture at a temperature of between 1,200 and 1,400 DEG C for 4 to 8 hours. The mol ratio of the strontium element in the strontium titanate matrix raw material to the lanthanum aluminate is (1-x) to x, wherein x is between 0.001 and 0.015. The new novel composite conducting ceramic has the performances of electrical conductivity, corrosion resistance, high temperature resistance, high strength, innocuity, thermal conductivity and the like, and is applicable to sensors, electric heating warming, industrial heating, drying and conductive ceramic for shielding electromagnetic waves for construction.

Description

technical field [0001] The invention relates to the field of materials, in particular to conductive ceramics, especially composite conductive ceramics of lanthanum aluminate and strontium titanate and a preparation method thereof. Background technique [0002] Generally, solid conductive materials include metals, conductive organic polymers and conductive ceramics. General ceramics are insulating, and their application range is greatly limited. The current conductive ceramics mainly refer to LaCrO 3 , ZrO 2 , SiC, β-Al 2 o 3 , YBa 2 Cu 3 o 7 Equal bulk conductive ceramics, there are ion (vacancy) conductive ceramics and electronic (vacancy) conductive ceramics. However, these conductive ceramics have disadvantages of one kind or another, such as high conductive temperature required; high cost: need SiC, ZrO 2 Raw materials with high price; Difficult to manufacture: All materials are difficult to sinter, and the sintering temperature is high; the resistivity is fixed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/622
Inventor 余锡宾杨绪勇
Owner SHANGHAI NORMAL UNIVERSITY
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