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Preparation method of single phase nano-CaTiO3 powder using collosol-gel low temperature synthesis

A gel method, low temperature technology, applied in the field of material science, can solve the problems of microwave dielectric properties of nano-CaTiO, difficult to obtain single-phase pure nano-CaTiO powder, etc., and achieve small particle size, high Qf value, and easy raw materials. the effect

Inactive Publication Date: 2008-06-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above about nano-CaTiO 3 There is a common difficulty in powder preparation methods: it is difficult to obtain single-phase pure nano-CaTiO 3 Powder; and so far, no nano-CaTiO 3 Related reports on microwave dielectric properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 1mol of Ca(NO 3 ) 2 4H 2 O is dissolved in 470 ml of absolute ethanol to form a calcium nitrate absolute ethanol solution with a concentration of about 2 mol / l; mix 1 mol of butyl titanate with 200 ml of absolute ethanol, then add 100 ml of acetic acid, and simultaneously add 3 g Concentrated nitric acid with a concentration of 65-68%; mix the above two solutions, stir evenly, then add 100ml of acetic acid, 2 grams of concentrated nitric acid with a concentration of 65-68%, and 20 grams of PEG400.

[0022] After the above mixed solution was stirred evenly, it was placed in a water bath at 60°C to obtain a yellow transparent gel, which was taken out and put into a tray, and dried at 90°C for 24 hours to obtain a crispy substance.

[0023] Grind the above-mentioned brittle substance, put it into a high-alumina crucible, and calcinate at 800° C. for 1 hour to obtain a white powder, which is the nanomaterial of the present invention.

[0024] The material is analyz...

Embodiment 2

[0027] Weigh 1mol of Ca(CH 3 COO) 2 ·H 2O is dissolved in 220ml of absolute ethanol to form a calcium acetate absolute ethanol solution with a concentration of about 4mol / l; mix 1mol of butyl titanate with 250ml of acetic acid, then add 150ml of absolute ethanol, and drop 2 grams at the same time Concentration of 65-68% concentrated nitric acid; Mix the above two solutions, stir evenly, then add 50ml of acetic acid, 100ml of absolute ethanol, 2 grams of concentrated nitric acid of 65-68%, 30 grams of oleic acid.

[0028] After the above mixed solution was stirred evenly, it was placed in a water bath at 40°C to obtain a yellow transparent gel, which was taken out and put into a tray, and dried at 120°C for 12 hours to obtain a dark red crispy substance.

[0029] Grind the above-mentioned crunchy dark red substance, put it into a high-alumina crucible, and calcinate at 700° C. for 1 hour to obtain a white powder, which is the nanomaterial of the present invention.

[0030] T...

Embodiment 3

[0033] Weigh 0.5mol of Ca(NO 3 ) 2 4H 2 O is dissolved in 80 ml of absolute ethanol to form a calcium nitrate absolute ethanol solution with a concentration of about 5 mol / l; mix 0.5 mol of butyl titanate with 100 ml of acetic acid, then add 150 ml of absolute ethanol, and drop 4 Concentrated nitric acid with a gram concentration of 65-68% and 5 grams of acrylic acid; mix the above two solutions, stir evenly, and then add 100 ml of acetic acid and 30 grams of PEG2000.

[0034] After the above mixed solution was stirred evenly, it was placed in a water bath at 50°C to obtain a yellow transparent gel, which was taken out and placed in a tray, and dried at 100°C for 12 hours to obtain a crispy substance.

[0035] Grind the above-mentioned brittle substance, put it into a high-alumina crucible, and calcinate at 750° C. for 1 hour to obtain a white powder, which is the nanomaterial of the present invention.

[0036] The material is analyzed by TEM electron microscope, and the av...

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Abstract

The present invention discloses a preparation method of low-temperature synthetic single-phase nano CaTiO3 ceramic powder body by using sol-gel process. Said method includes the following steps: dissolving inorganic salt of calcium in anhydrous ethyl alcohol; dissolving butyl titanate in the mixed solution of anhydrous ethyl alcohol and acetic acid; drop-adding nitric acid and acrylic acid to regulate pH value; according to mole ratio of 1:1 of calcium: titanium mixing the above-mentioned two solutions, adding proper quantity of dispersing agent; uniformly stirring the obtained solution, sealing and standing still to obtain gel, drying and grinding said gel, calcining so as to obtain the invented nano ceramic powder body.

Description

technical field [0001] The present invention relates to nanometer CaTiO 3 The preparation method of the powder, especially involving the low-temperature synthesis of single-phase nano-CaTiO by the sol-gel method 3 The powder method belongs to the technical field of material science. Background technique [0002] CaTiO 3 It is an important titanate, which has a high dielectric constant and can be made into small high-capacity high-frequency ceramic capacitors, such as coupling, bypass, energy storage, DC blocking capacitors, etc.; currently, CaTiO 3 Ceramics have been widely used as raw materials for the preparation of dielectric materials in the electronics industry and basic conductive components for high-frequency instruments. As early as the 1970s, Kell et al first announced CaTiO on page 352 of "J.Am.Ceram.Soc." 56 (1973). 3 Microwave dielectric properties of ceramics: ε r =170, Qf=3500GHz, τ f =+800ppm / °C. Due to its large positive frequency temperature coefficie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00C04B35/624C04B35/465
Inventor 张启龙杨辉王焕平孙慧萍
Owner ZHEJIANG UNIV
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