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Spray coating method for producing dielectric ceramic powder body and obtained products thereof

A ceramic powder and dielectric technology, applied in the field of electronic ceramic powder, can solve the problems of low drying temperature, loss of barium ions, long production cycle, etc., and achieve the effects of ultra-high uniformity, good dispersion and low production cost

Inactive Publication Date: 2008-12-03
GUANGDONG FENGHUA ADVANCED TECH HLDG
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Problems solved by technology

However, due to the different precipitation conditions of various dopants, they are more sensitive to changes in external conditions, so the actual operation is quite complicated, and it is difficult to control large-scale production; at the same time, in order to control its better precipitation conditions, it is often necessary to Precipitation coating at low solid content, even supplemented by repeated precipitation washing, so its efficiency is low, and it needs to consume a large amount of deionized water, which undoubtedly increases the cost
In addition, due to its multiple precipitation, repeated washing with a large amount of deionized water, which tends to affect the 3 (BT), Ba x (Ti 1-a Zr a )O 3 (BTZ), (Ba 1-b Ca b ) x (T i-a Zr a )O 3 (BCTZ), (Ca 1-c Sr c ) ZrO 3 (CSZ), (Ba 1-c Sr c ) ZrO 3 (BSZ), SrTiO 3 (ST) (a=0.1-0.35, b=0.1-0.15, c=0.30-0.70, x=0.90-1.05), etc. cause excessive loss of individual elements, especially when nano-scale powders with high surface activity are lost Larger, such as BT in neutral or weakly alkaline slurry, barium ions are easy to lose, under repeated washing with a large amount of deionized water, it is difficult to effectively control the ratio of Ba element to Ti element in BT, and from literature search and According to a large number of actual experiments, the effective control of Ba and Ti elements in BT is the basis for realizing stable mass production of BT-based materials
In addition, sol-gel coating has also been reported in the literature in recent years, but its gel forming cycle is long and the drying temperature is low, resulting in a long production cycle, which is not conducive to large-scale modern production

Method used

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  • Spray coating method for producing dielectric ceramic powder body and obtained products thereof
  • Spray coating method for producing dielectric ceramic powder body and obtained products thereof
  • Spray coating method for producing dielectric ceramic powder body and obtained products thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0016] In this example, BT powder with a particle size of 300nm to 350nm prepared by the hydrothermal method is used as the main crystal phase, and the following formula composition and the spray coating method are used to prepare dielectric ceramics for MLCC with temperature characteristics conforming to the EIA-X7R standard Powder.

[0017] Dissolve 0.30Kg of polyacrylamide in 130Kg of deionized water at 25°C and put it into the ball mill, then add 100.00Kg of BT powder, cover and seal it, start the machine to disperse for 5 hours, and then completely discharge it into the plastic In the container is slurry A. Another weighed 2.33Kg of Ca (NO 3 ) 2 .4H 2 O, 5.25Kg of Y (NO 3 ) 3 .6H 2 O, 0.31Kg concentration is 50% Mn(NO 3 ) 2 Slurry, 0.88Kg of Mg(NO 3 ) 2 ·6H 2 O, 0.38Kg of Cu(NO 3 ) 2 ·6H 2 O. 1.00Kg of silica sol with a solid content of 40% is diluted with 100L deionized water to form a doped modified salt slurry, and then slowly added to the aforementioned ...

Embodiment 2

[0020] In this embodiment, the particle size is 200nm hydrothermal ultrafine cubic phase Ba(Ti 0.866 Zr 0.134 )O 3 (BTZ) is the main crystal phase, and the dielectric ceramic powder whose temperature characteristics meet the EIA-Y5V standard is prepared by the following formula composition and the spray coating method, and the nickel electrode multilayer ceramic is prepared by conventional casting method for performance verification.

[0021] Weigh 306g of Ca (NO 3 ) 2 . 4H 2 O, 135g weight of Y(CH 3 COO) 3 . 3.15H 2 O, 62g weight of Mn(CH 3 COO) 2 . 4H 2 O, the Mg(CH of 54g weight 3 COO) 2 . 4H 2 O, 30g weight of Cu(NO 3 ) 2 . 3H 2O, 267g solid content is the titania sol of 20wt%, 250g solid content is the AK0531 polymer dispersant of 20wt% silica sol and 30g, after adding deionized water 8.87Kg it is fully dissolved to obtain slurry A. In addition, weigh 20Kg of hydrothermal ultra-fine high-purity cubic phase BTZ with a particle size of about 200nm prepa...

Embodiment 3

[0024] The present embodiment prepares the superfine Zn that particle size is 300nm by co-precipitation method 0.70 Mg 0.30 TiO 3 (ZMT) is the main crystal phase, and the electronic ceramic material whose temperature characteristics meet the EIA-COG standard is prepared with the following formula composition and the described spray coating method, and a multilayer ceramic capacitor is prepared with a conventional casting method and a silver paste with low palladium content Perform performance verification.

[0025] Weigh 100Kg of the main sintered block ZMT into the three-dimensional vibration mill, then add 100L of deionized water at 30°C, start the machine and grind for 8 hours to disperse into a slurry, and then discharge the material into a container with stirring, then add deionized water to adjust its The solid content is 45%, after weighing 30Kg of the slurry into another well-stirred container as A, and taking by weighing 97.3g of 50% manganese slurry and 40.5g of bo...

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Abstract

The invention relates to a spray coating method for preparing dielectric ceramic powder and the dielectric ceramic powder prepared. The spray coating method comprises the following steps: A. main crystal phase ceramic powder and modified metallic ion composite soluble inorganic salt precursor or sol are processed into slurry with good fluidity; B. the slurry in the step A is prepared by deionized water into slurry with a solid content between 5 and 70 percent; and C. the slurry obtained in the step B is stirred and simultaneously conveyed to a spray drier by a feed pump, the feed rate is controlled to between 0.01 and 6.01 liters per minute, and the dielectric ceramic powder required is prepared after spray drying of the slurry at a hot blast temperature of between 120 and 450 DEG C; or D. the dielectric ceramic powder obtained in the step C is placed into a high temperature furnace at a temperature of between 250 and 1200 DEG C for calcinating 0.5 to 6 hours. The method is economic and simple; doped compositions and main crystal phase materials are uniformly distributed; and prepared dielectric powder crystal grains reach submicron or nano level and have superhigh evenness and dispersity.

Description

technical field [0001] The invention relates to a spray coating method for preparing electronic ceramic powder and the obtained electronic ceramic powder, in particular to a spray coating method for dielectric ceramic powder for electronic components and the obtained dielectric ceramic powder. Background technique [0002] The preparation of fine electronic ceramic materials is usually based on the synthesis of the main component sinter or main crystal phase, and the predetermined function is realized by adding one or more doping and modifying components. With the rapid rise of 3G mobile technology and the continuous integration of 3C technology, the continuous rapid development of handheld electronic device terminals represented by mobile phones, GPS, MP3, MP4, flash drives, DC, DV, Bluetooth, and small-sized notebook computers. The continuous development of equipment in the direction of miniaturization, ultra-miniaturization and high reliability has promoted the continuous...

Claims

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Application Information

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IPC IPC(8): C04B35/628
Inventor 杜泽伟曹秀华孟淑媛付振晓
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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