A kind of thin dielectric material for x5r type multilayer ceramic capacitor and its preparation method
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A technology of multilayer ceramics and capacitors, which is applied in the direction of fixed capacitor dielectrics, laminated capacitors, capacitors, etc., can solve problems such as short life and unsatisfactory product performance, reduce sintering temperature, improve reduction resistance, and improve sintering compactness Effect
Active Publication Date: 2020-01-07
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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[0003] Although the MLCC dielectric materials involved in many patent documents meet the requirements of X5R characteristics, they have a short life under high temperature and high pressure loads and cannot meet specific product performance
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Embodiment 1
[0035] The preparation method of the dielectric material is carried out according to the following steps:
[0036](1) Preparation of main component BaTiO by hydrothermal method 3 , where Ba / Ti=1. BaTiO 3 Add chromium oxide into the ball mill tank with zirconia as the grinding medium according to x=0.01, add deionized water (material: water=1:1.3) to mix, ball mill for 5 hours, dry, sieve (60 mesh or 80 mesh ), calcined (800-1050°C) for subsequent mixed use.
[0037] (2) Preparation method of glass powder: weigh CaO, SiO 2 , ZnO, BaO, B 2 o 3 Mix according to molar ratio 5:65:10:10:10. After mixing, add it to the ball mill tank of zirconia grinding medium, add deionized water (material: water = 1:1.2) to mix, ball mill for 4 hours, dry, pass through 80 mesh sieve, vitrify (sintering temperature 1200 ° C, heat preservation 2h), the calcined material is sand milled and dispersed until the particle size is 30-100nm.
[0038] (3) BaTi (1-x) Cr x o 3 , auxiliary additive ...
Embodiment 2
[0042] The ratio of raw materials is shown in Table 1.
[0043] In step (1), the material in the ball mill tank: water = 1:1.5, pass through a 60-mesh sieve, and the calcination temperature is 1000°C.
[0044] In step (2), the material in the ball mill tank: water = 1:1.4, the sintering temperature is 1200° C., and the temperature is kept for 2 hours.
[0045] In step (3), the material in the ball mill tank: water = 1:1.8, and ball mill for 3 hours.
[0046] The calcining temperature in step (4) is 750°C. Pass the calcined product through a 60-mesh sieve.
[0047] Step (5) Material in the ball mill tank: water = 1:1.7, after 3 hours of ball milling, dry and pass through a 60-mesh sieve.
[0048] Other operations are the same as in Example 1.
Embodiment 3～13
[0050] The ratio of raw materials is shown in Table 1. The preparation method is the same as in Example 1.
[0051] Table 1 Dielectric material composition list
[0052]
[0053]
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Abstract
The invention provides a thin dielectric material for X5R multilayer ceramic capacitors. The thin dielectric material for X5R multilayer ceramic capacitors is composed of a main component and an auxiliary additive, wherein the main component is BaTi(1-x)CrxO3 (0.005<x<=0.05); on the basis of 100mol of the main component, the addition amount of the auxiliary additive is 0.32-5.6mol; and the auxiliary additive is composed of acetates, transition metal oxides and glass powder. The dielectric material provided by the invention has the advantages of favorable temperature stability and high reliability. By using the chromium barium titanate as the main component, the additive introduced into the formula mostly adopts water-soluble acetates, thereby being more beneficial to the mixing of the additive and main component on the atom level. The thin dielectric material solves the problem of poor product reliability since the oxides used as the main additive and the main component can not be mixed uniformly in the existing dielectric material. The glass powder added into the formula can effectively lower the sintering temperature of the product and enhance the sintering compactness of the product. The introduced rare earth element can enhance the reduction resistance of the dielectric material.
Description
technical field [0001] The invention belongs to the field of energy materials, and in particular relates to a capacitor dielectric material and a preparation method thereof. Background technique [0002] Capacitors are one of the electronic components widely used in electronic equipment. They are widely used, large in amount and irreplaceable. With the rapid development of electronic technology, the emergence and development of new electronic products represented by mobile phones, flat panel displays, and automotive electronics have brought good opportunities for the development of capacitors. As an important part of capacitors, multi-layer ceramic capacitors (Multi-layer Ceramic Capacitor, abbreviated as MLCC) are favored due to their small size, high insulation resistance, and low inductance. It is especially suitable for increasing the density of circuit assembly and reducing the volume of the whole machine, which makes MLCC a component with the largest consumption and r...
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