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High-temperature X8R type ceramic-capacitor dielectric material and preparation method thereof

A technology of ceramic capacitors and dielectric materials, applied in the direction of fixed capacitor dielectrics, capacitors, fixed capacitors, etc., can solve the problems of low working temperature range, low compressive strength, high dielectric loss, and achieve high working temperature range and high compressive strength. , the effect of reducing the sintering temperature

Active Publication Date: 2017-01-25
FUJIAN TORCH ELECTRON TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a solution to the problems of low operating temperature range, low compressive strength, low dielectric constant, high dielectric loss, high sintering temperature, etc., which has high dielectric constant (K value), high resistance Compressive strength, high temperature stability (above 150°C), and can be matched with the 30Pd-70Ag inner electrode sintered at medium and low temperature when preparing multilayer ceramic fixed capacitors to achieve medium temperature sintering (1100°C ~ 1190°C) high temperature X8R Type ceramic capacitor dielectric material and preparation method thereof

Method used

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  • High-temperature X8R type ceramic-capacitor dielectric material and preparation method thereof
  • High-temperature X8R type ceramic-capacitor dielectric material and preparation method thereof
  • High-temperature X8R type ceramic-capacitor dielectric material and preparation method thereof

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preparation example Construction

[0040] A method for preparing a high-temperature X8R type ceramic capacitor dielectric material, characterized in that it comprises the following steps:

[0041] Step 1, synthesizing the eutectic of barium titanate and bismuth sodium barium titanate after first synthesizing bismuth sodium barium titanate;

[0042] Step 2, synthesize the eutectic of oxides of niobium manganese and A, the atomic ratio of niobium to manganese is 6ˉ11, the atomic ratio of niobium to A element is 4.5ˉ8.5, and the atomic ratio of Nb to A is 4.5ˉ8.5. 2 o 5 , MnCO 3 , A oxide as raw material, wherein the A element is one or more of cobalt (Co), nickel (Ni), zinc (Zn), bismuth (Bi), etc., carry out batching, ball milling, drying, crushing, passing 40 Mesh standard screen, and then calcined at 900-1150°C for 2-6 hours to synthesize a co-melt of oxides of niobium-manganese and A;

[0043] Step 3, synthesis of silicon-lithium eutectic, by Li / Si atomic ratio=2ˉ4, with Li 2 CO 3 , SiO 2 As a raw mater...

specific Embodiment 1

[0050] Step 1, first synthesize bismuth sodium barium titanate and then synthesize the eutectic of barium titanate and bismuth sodium barium titanate, weigh 8.11g Ba(OH) respectively 2 ·8H 2 O, 10.68g Na 2 CO 3 , 46.96g Bi 2 o 3 , 34.25g TiO 2 , mixed ball milling, drying, crushing, passing through a 40-mesh standard sieve, and calcining at 850°C for 2 hours to synthesize bismuth sodium barium titanate; weigh 98g BaTiO 3 and 2g of bismuth sodium barium titanate synthesized in step ①, mixed with ball milling, dried, crushed, passed through a 40-mesh standard screen, and calcined at 1100°C for 3 hours to synthesize a eutectic product of barium titanate and bismuth sodium barium titanate;

[0051] Step 2, synthesize the eutectic of the oxide of niobium manganese and A, weigh 78g Nb respectively 2 o 5 , 10g MnCO 3 , 3gZnO, 9gCo 2 o 3 , mixing ball milling, drying, crushing, passing through a 40-mesh standard sieve, and calcining at 900°C for 2.5 hours to synthesize a nio...

specific Embodiment 2

[0056] Step 1, first synthesize bismuth sodium barium titanate and then synthesize the eutectic of barium titanate and bismuth sodium barium titanate, weigh 8.11g Ba(OH) respectively 2 ·8H 2 O, 10.68g Na 2 CO 3 , 46.96g Bi 2 o 3 , 34.25g TiO 2 , mixed ball milling, drying, crushing, passing through a 40-mesh standard sieve, and calcining at 900°C for 2 hours to synthesize bismuth sodium barium titanate, and weigh 97.5g BaTiO 3 and 2.5g of bismuth sodium barium titanate synthesized in step ①, mixed with ball milling, dried, crushed, passed through a 40-mesh standard screen, and calcined at 1090°C for 3 hours to synthesize a eutectic product of barium titanate and bismuth sodium barium titanate;

[0057] Step 2, synthesize the eutectic of the oxide of niobium manganese and A, weigh 80g Nb respectively 2 o 5 , 10g MnCO 3 , 10gCo 2 o 3 , mixing ball milling, drying, crushing, passing through a 40-mesh standard sieve, and calcining at 930°C for 2.5 hours to synthesize a n...

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Abstract

The invention belongs to the technical field of ceramic-capacitor dielectric materials and particularly relates to a high-temperature X8R type ceramic-capacitor dielectric material. The high-temperature X8R type ceramic-capacitor dielectric material is characterized in that a co-fusion content of barium titanate and sodium bismuth titanate barium is taken as the main material, a co-fusion content of niobium manganese and oxide of A, a silicon lithium co-fusion content, a barium metaborate co-fusion content and Re2O3 are added, the element A is one or more of cobalt, nickel, zinc, bismuth and the like, and the element Re is one or more of rare-earth elements of praseodymium, samarium, gadolinium, dysprosium and the like. A capacitor made from the high-temperature X8R type ceramic-capacitor dielectric material is high in dielectric constant and high-temperature stability, medium-temperature sintering can be realized since the high-temperature X8R type ceramic-capacitor dielectric material can be matched with a medium and low-temperature sintered 30Pd-70Ag inner electrode in production of a multilayer ceramic dielectric fixed capacitor, application in high-temperature environment is realized, and high industrial prospects and industrial application value are achieved.

Description

technical field [0001] The invention belongs to the technical field of multilayer ceramic capacitor materials, in particular to a high-temperature X8R type ceramic capacitor dielectric material and a preparation method thereof. Background technique [0002] Multilayer ceramic fixed capacitors (hereinafter referred to as MLCC) are indispensable and important components of various electronic equipment. They have the characteristics of large capacity range, low dielectric loss, small size, and suitable for surface mounting. They are widely used in aerospace, aviation, and weaponry. , electronic countermeasures, vehicle control, energy exploration, industrial control, mobile communications, rail transit and other military and industrial fields. [0003] With the rapid development of modern information technology and MLCC application industry, MLCC continues to develop in the direction of high compressive strength, high temperature stability, high capacity, miniaturization, and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622H01G4/12
CPCC04B35/4682C04B35/622C04B2235/3201C04B2235/3203C04B2235/3215C04B2235/3251C04B2235/3262C04B2235/3275C04B2235/3284C04B2235/3298C04B2235/3409C04B2235/3418H01G4/1218
Inventor 吴金剑林志盛黄祥贤宋运雄陈永虹谢显斌许金飘
Owner FUJIAN TORCH ELECTRON TECH CO LTD
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