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Method for low-temperature synthesis of nanometer CaO-SiO2 series nanometre microwave medium ceramic powder

A microwave dielectric ceramic and nanotechnology, applied in the field of material science, can solve the problems of large particle size of ceramic powder, which cannot meet the requirements of ultra-thin cast film and micro devices, etc., and achieve low synthesis temperature, easy access to raw materials, and low price Effect

Inactive Publication Date: 2007-08-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CaO-SiO prepared above 2 The particle size of the ceramic powder is too large, which cannot meet the requirements for the preparation of ultra-thin cast films and micro devices

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 1mol of Ca(NO 3 ) 2 4H 2 O is dissolved in a certain amount of deionized water to form a 0.8 mol / l calcium nitrate aqueous solution; add silica sol to the calcium nitrate aqueous solution according to the amount of 1 mol of silicon, and stir for 2 hours to make it evenly mixed. Add 1 mol of citric acid (CA) to 4 mol of ethylene glycol (EG), and heat to 90°C to dissolve citric acid in ethylene glycol.

[0021]The above two solutions are mixed, stirred, and heated slowly to evaporate the water in the mixed solution to obtain a transparent sol-like liquid. Heat the transparent sol-like liquid to 130°C and keep it warm for 3 hours. Bubbles will be generated and accompanied by volume expansion at the beginning of the heat preservation. At the end of the heat preservation, its volume will not change. Continue to heat up to 200°C and keep it for 2 hours, and then cool with the furnace. A crunchy black mass was obtained.

[0022] Grind the above-mentioned brittle blac...

Embodiment 2

[0026] Weigh 1mol of CaCl 2 Dissolve in a certain amount of deionized water to form a 1 mol / l calcium chloride aqueous solution; add silica sol to the calcium chloride aqueous solution in an amount of 1 mol of silicon, and stir for 2 hours to make it evenly mixed. Add 1.2 mol of citric acid to 6 mol of ethylene glycol, and heat to 90°C to dissolve citric acid in ethylene glycol.

[0027] The above two solutions are mixed, stirred, and heated slowly to evaporate the water in the mixed solution to obtain a transparent sol-like liquid. Heat the transparent sol-like liquid to 135°C and keep it warm for 3 hours. Bubbles will be generated and accompanied by volume expansion at the beginning of the heat preservation. At the end of the heat preservation, the volume will not change. Continue to heat up to 220°C and keep it for 2 hours, and then cool with the furnace. A crunchy black mass was obtained.

[0028] Grind the above-mentioned brittle black substance, put it into a high-alum...

Embodiment 3

[0032] Weigh 1mol of Ca(CH 3 COO) 2 ·H 2 O is dissolved in a certain amount of deionized water to form a 1.5 mol / l calcium acetate aqueous solution; add silica sol to the calcium acetate aqueous solution according to the amount of 1 mol of silicon, and stir for 3 hours to make it evenly mixed. Add 1.5 mol of citric acid to 6 mol of ethylene glycol, and heat to 90°C to dissolve citric acid in ethylene glycol.

[0033] The above two solutions are mixed, stirred, and heated slowly to evaporate the water in the mixed solution to obtain a transparent sol-like liquid. Heat the transparent sol-like liquid to 130°C for 4 hours and heat it for 4 hours. At the beginning of heat preservation, bubbles will be generated and accompanied by volume expansion. In the later stage of heat preservation, its volume will no longer change. Continue to heat up to 210°C for 2 hours, and then cool with the furnace. A crunchy black mass was obtained.

[0034] Grind the above-mentioned brittle black ...

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PUM

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Abstract

The invention discloses a method to synthesize nano CaO-SiO2 series microwave medium ceramic powder at low temperature, which comprises: (1) dissolving the calcium into inorganic salt, adding silicon sol to mix according to mole rate of 1:1; (2) adding an mount of citric acid into ethylene alcohol for heating dissolution; (3) mixing the said two solutions with given mole rate, heating to vaporize water; heating till 125-135Deg and keeping temperature for 2-4h; continuing to heat to 180-220Deg and keeping temperature for 2-4h; grinding the obtained black material and calcining at temperature of 700-900Deg; finally, one obtains the product.

Description

technical field [0001] The present invention relates to nanometer CaO-SiO 2 A method for preparing microwave dielectric ceramic powder, especially a low-temperature synthesis of nano-CaO-SiO 2 The invention relates to a microwave dielectric ceramic powder method, which belongs to the technical field of material science. Background technique [0002] With the miniaturization of electronic equipment, miniaturization and miniaturization of various electronic components is inevitable. At present, the miniaturization of components has achieved rapid development; in terms of multilayer ceramic capacitors, 0603 has become the mainstream product, 0402 has been launched, and 0201 has been successfully developed; chip multilayer microwave devices have gradually replaced the cavity structure and are increasingly miniaturized. For example, the size of the multilayer ceramic filter of Murata Corporation in Japan has been reduced to 2.0×1.25×1.0 (mm 3 ), in the future the size will be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/16C04B33/24H01B3/12
Inventor 杨辉张启龙王焕平
Owner ZHEJIANG UNIV
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