Preparation of X9R-type ceramic capacitor dielectric material through chemical coating process
A technology of ceramic capacitors and dielectric materials, applied in the direction of fixed capacitor dielectrics and components of fixed capacitors, can solve the problems of small capacity change rate, low operating temperature, large grain size, etc., and achieve small grain size, Wide operating temperature range and uniform distribution
Inactive Publication Date: 2017-06-20
TIANJIN UNIV
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the shortcomings of existing multilayer ceramic capacitor dielectric materials such as low working temperature, large and uneven grain size, and provide a wide working temperature range (-55 ° C ~ 200 ° C) prepared by chemical coating method. ), the capacity change rate is small (<±15%), the multilayer ceramic capacitor dielectric with uniform grain distribution
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[0018] The raw materials used in the present invention are all analytically pure raw materials, and the present invention will be further illustrated by specific examples below.
[0019] According to the stoichiometric ratio of NBT, dissolve bismuth nitrate and sodium nitrate in the citric acid aqueous solution, stir until clear to form solution A; dissolve tetrabutyl titanate in ethylene glycol to form solution B; pour solution A slowly Into solution B, add appropriate amount of ammonia to adjust the PH value of 4-8 to form sol C; then disperse BT with a particle size of 50-300 nm in polyethylene glycol, and ultrasonically treat it for 30 minutes to obtain BT suspension D; slow sol C Pour into suspension D, then stir at 80℃ to form a gel; according to the molar ratio of BT to NBT 100:10-20, 100:21-30, 100:31-35, respectively, the ingredients will form gel E1 and E2. , E3; Self-propagating combustion of the gels E1, E2, and E3 in a furnace at 550°C to obtain BT@NBT powders F1, F2...
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Abstract
The invention discloses a method for preparing an X9R-type ceramic capacitor dielectric material through a chemical coating process. The method comprises the following steps: dissolving bismuth nitrate and sodium nitrate into a citric acid water solution to prepare a solution A according to a stoichiometric ratio of Na0.5Bi0.5TiO3(NBT); dissolving tetrabutyl titanate into ethylene glycol to prepare a solution B; pouring A into B to prepare sol C; dispersing BiTiO3 into polyethylene glycol to obtain suspension liquid D; pouring C into D to form gel; preparing gel E1, E2 and E3 from BaTiO3 (BT) and NBT according to a molar ratio of 100:10-20, 100:21-30 and 100:31-35, and performing self-propagating combustion to obtain BT-NBT powder F1, F2 and F3; performing mixing according to a mass ratio of 1:1:1 to obtain turbid liquid G; dissolving Nb(OH)5 into an oxalic acid water solution to form a solution H; pouring H into G to obtain suspension liquid I, drying the suspension liquid to obtain BT-NBT-Nb three-layer powder, and sintering at the temperature of 1200-1270 DEG C after forming to prepare the X9R-type ceramic capacitor dielectric material. The working temperature of the X9R-type ceramic capacitor dielectric material is -55 DEG C to 200 DEG C, grains are small and are uniformly distributed, and the application prospect is great.
Description
Technical field [0001] The invention belongs to the field of electronic information materials and components, and particularly relates to a ceramic capacitor dielectric with a wide operating temperature range prepared by a chemical coating method based on barium titanate and a preparation method thereof. Background technique [0002] Chip multilayer ceramic capacitors are the most basic components of electronic equipment and have a wide range of applications. As the requirements for electronic components to meet harsh environmental conditions are getting higher and higher, the upper limit operating temperature requirements of the dielectric materials for MLCC continue to increase. For example, high-power phased array radars, armored vehicles, and missile / rocket-borne circuits all require the operating temperature of the device to extend above 150°C; electronic equipment used to explore oil and gas reserves may need to be exposed to temperatures of nearly 200°C; In China's manned...
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IPC IPC(8): C04B35/475C04B35/624C04B35/626C04B35/622C04B41/88H01G4/12
CPCC04B35/475C04B35/622C04B35/624C04B35/6267C04B41/009C04B41/5116C04B41/88C04B2235/3201C04B2235/3251C04B2235/656C04B2235/781C04B2235/785H01G4/1218C04B41/4539C04B41/0072
Inventor 李玲霞张宁于经洋柳亚然陈俊晓
Owner TIANJIN UNIV