Low temperature synthesis of ultra-fine ZnO-SiO2 microwave dielectric ceramic powder by sol-gel method
A microwave dielectric ceramic and gel method technology is applied in the field of material science to achieve the effects of lowering synthesis temperature, increasing Q×f value and lower price
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Embodiment 1
[0019] Weigh 1mol of Zn(NO 3 ) 2 .6H 2 O is dissolved in 475 ml of absolute ethanol to form an absolute ethanol solution of zinc nitrate with a concentration of about 2.0 mol / l; mix 0.5 mol of ethyl orthosilicate with 110 ml of absolute ethanol to form ethyl orthosilicate ethanol solution; the above two solutions were mixed, stirred evenly, and 550 milliliters of absolute ethanol was added to make the zinc concentration 0.8 mol / l. Then add 3 mol of deionized water, 8 grams of concentrated nitric acid with a concentration of 65-68%, and 20 grams of PEG400, and the pH value of the solution is 1.5.
[0020] After the above mixed solution was stirred evenly, it was placed in a water bath at 30°C to obtain a colorless and transparent gel. The gel was taken out and placed in a tray, and dried at 80°C for 24 hours to obtain a crispy substance.
[0021] Grind the above-mentioned brittle substance, put it into a high-alumina crucible, and calcinate at 800°C for 1 hour to obtain whit...
Embodiment 2
[0025] Weigh 0.5mol of Zn(CH 3 COOH) 2 2H 2 O is dissolved in 320 ml of absolute ethanol to form a zinc acetate absolute ethanol solution with a concentration of about 1.5 mol / l; mix 0.25 mol of tetraethyl orthosilicate with 115 ml of absolute ethanol to form tetraethyl orthosilicate ethanol solution; mix the above two solutions, stir evenly, add 400 ml of absolute ethanol to make the zinc concentration 0.6mol / l. Then add 2mol deionized water, 3 gram concentrations and be 65~68% concentrated nitric acid and 4 gram acrylic acid, 10 gram PEG1000, the pH value of solution is 2.
[0026] After the above mixed solution was stirred evenly, it was placed in a water bath at 35°C to obtain a colorless and transparent gel. The gel was taken out and placed in a tray, and dried at 90°C for 24 hours to obtain a crispy substance.
[0027] Grind the above-mentioned brittle substance, put it into a high-alumina crucible, and calcinate at 850°C for 1 hour to obtain white ZnO-SiO 2 Microwav...
Embodiment 3
[0031] Weigh 0.5mol of Zncl 2 Dissolve in 115 ml of absolute ethanol to form a zinc nitrate absolute ethanol solution with a concentration of about 4 mol / l; mix 0.25 mol of ethyl orthosilicate with 110 ml of absolute ethanol to form an ethyl orthosilicate ethanol solution; The above two solutions were mixed, stirred evenly, and 250 ml of absolute ethanol was added to make the zinc concentration 1.0 mol / l. Then add 1mol deionized water, 2.5 grams of concentration and be 65~68% concentrated nitric acid, 8 grams of PEG1000, the pH value of solution is 2.5.
[0032]After the above mixed solution was stirred evenly, it was placed in a water bath at 30°C to obtain a colorless and transparent gel. The gel was taken out and placed in a tray, and dried at 80°C for 24 hours to obtain a crispy substance.
[0033] Grind the above-mentioned brittle substance, put it into a high-alumina crucible, and calcinate at 800°C for 1 hour to obtain white ZnO-SiO 2 Microwave dielectric ceramic powd...
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