A core-shell structure high electric strength titanium oxide-based dielectric powder and its preparation method and application
A technology of electric strength and core-shell structure, applied in the direction of inorganic insulators, ceramics, etc., can solve problems that are difficult to meet the needs of practical applications, and achieve the effect of improving electric strength and high dielectric constant
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Embodiment 1
[0069] Example 1: Medium powder with core-shell structure, pressureless sintering
[0070] The composition of the titanium oxide-based dielectric material is TiO 2 -4wt% (CaO-MgO-2Al 2 o 3 -8SiO2 2 ). The raw materials are weighed according to the above chemical formula composition and fired.
[0071] (1) According to the CaO, MgO, Al in the above cladding layer 2 o 3 The molar ratio of the prepared solution A: Weigh an appropriate amount of Ca(NO 3 ) 2 4H 2 O, Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O was added to a certain amount of deionized water, stirred evenly by magnetic force, and the stirring speed was 600 rpm. The total concentration of cations in the prepared solution was 0.06mol / L. Among them, Ca 2+ The ion concentration is 0.01mol / L, Mg 2+ The ion concentration is 0.01mol / L, Al 3+ The ion concentration is 0.04mol / L;
[0072] (2) Preparation solution B: Weigh an appropriate amount of Si(OC 2 h 5 ) 4 Add it into a certain amount of absolute etha...
Embodiment 2
[0080] Example 2: Medium powder with core-shell structure, pressureless sintering
[0081] The composition of the titanium oxide-based dielectric material is TiO 2 -8wt% (CaO-MgO-2Al 2 o 3 -8SiO2 2 ). Repeat the preparation method of Example 1 according to the above chemical formula composition.
[0082] (1) According to the CaO, MgO, Al in the above cladding layer 2 o 3 The molar ratio of the prepared solution A: Weigh an appropriate amount of Ca(NO 3 ) 2 4H 2 O, Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O was added to a certain amount of deionized water, stirred evenly by magnetic force, and the stirring speed was 600 rpm. The total concentration of cations in the prepared solution is 0.18mol / L; where, Ca 2+ The ion concentration is 0.03mol / L, Mg 2+ The ion concentration is 0.03mol / L, Al 3+ The ion concentration is 0.12mol / L;
[0083] (2) Preparation solution B: Weigh an appropriate amount of Si(OC 2 h 5 ) 4 Add it into a certain amount of absolute ethanol,...
Embodiment 3
[0091] Example 3: Medium powder with core-shell structure, pressureless sintering
[0092] The composition of the titanium oxide-based dielectric material is TiO 2 -12wt% (CaO-MgO-2Al 2 o 3 -8SiO2 2 ), the preparation method of Example 1 is formed according to the above chemical formula.
[0093] (1) According to the CaO, MgO, Al in the above cladding layer 2 o 3 The molar ratio of the prepared solution A: Weigh an appropriate amount of Ca(NO 3 ) 2 4H 2 O, Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O was added to a certain amount of deionized water, stirred evenly by magnetic force, and the stirring speed was 600 rpm. The total concentration of cations in the prepared solution is 0.30mol / L; where, Ca 2+ The ion concentration is 0.05mol / L, Mg 2+ The ion concentration is 0.05mol / L, Al 3+ The ion concentration is 0.20mol / L;
[0094] (2) Preparation solution B: Weigh an appropriate amount of Si(OC 2 h 5 ) 4 Add it into a certain amount of absolute ethanol, stir it ...
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