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Ceramic material of middle-low temp. sintered temp stable type multirayer ceramic capacitor

A temperature-stable capacitor ceramic technology, applied in the field of capacitor materials, can solve problems such as inability to produce and use, and achieve the effects of narrow particle size distribution, cost reduction, and small grain size

Inactive Publication Date: 2005-06-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, US 5,571,767 filed in 1995 discloses a X7R ceramic material with a sintering temperature of about 1100°C, and its room temperature dielectric constant is about 3200, but this ceramic material contains Pb, so it can no longer be used in production

Method used

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  • Ceramic material of middle-low temp. sintered temp stable type multirayer ceramic capacitor
  • Ceramic material of middle-low temp. sintered temp stable type multirayer ceramic capacitor
  • Ceramic material of middle-low temp. sintered temp stable type multirayer ceramic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Barium titanate BaTiO 3The main material is synthesized by hydrothermal method, and the initial particle size is about 300nm. First, solid solutions with Nb / Co atomic ratios of 3:1 and 2:1 were synthesized by solid-state method. Add secondary additives to 20g of barium titanate powder material respectively according to the formula, the solid solution content of Nb / Co in the formula is 1.5wt%, and the content of neodymium oxide is 0.9wt%, recorded as 1-1, 1- 2. The ingredients are mixed by ball milling, and after drying, they are pressed into shape under a pressure of 2MPa, with a diameter of 10mm and a thickness of 1mm. Sinter at 1150°C for 4h with a heating rate of 6°C / min. The dielectric properties of the fired ceramic pieces were measured after firing silver on the surface. The dielectric properties of the obtained ceramic samples are shown in Table 1. figure 1 The curve shows the dielectric temperature characteristic curve of the sample. figure 2 Give the vol...

Embodiment 2

[0033] Barium titanate BaTiO 3 The main material is synthesized by hydrothermal method, and the initial particle size is about 300nm. In 20g of barium titanate powder material, add secondary additives according to the formula respectively. In the formula, the content of solid solution with Nb / Co atomic ratio of 3:1 is 1.2wt%, and the content of lanthanum oxide is 0.8wt% and 0.9wt%, respectively. %, 1.0wt%, recorded as 2-1, 2-2, 2-3. The ingredients are mixed by ball milling, and after drying, they are pressed into shape under a pressure of 2MPa, with a diameter of 10mm and a thickness of 1mm. Sinter at 1150°C for 4h with a heating rate of 6°C / min. The dielectric properties of the fired ceramic pieces were measured after firing silver on the surface. The dielectric properties of the obtained ceramic samples are shown in Table 1. image 3 The curve shows the dielectric temperature characteristic curve of the sample. Figure 4 Give the volumetric temperature change rate curv...

Embodiment 3

[0035] Barium titanate BaTiO 3 The main material is synthesized by hydrothermal method, and the initial particle size is about 300nm. Add secondary additives to 20g of barium titanate powder material according to the formula. In the formula, the solid solution content of Nb / Co atomic ratio is 3:1 is 1.5wt%, neodymium oxide and samarium oxide are co-doped, and the content is respectively 0.6 wt%, 0.3wt%, recorded as 3-1. The ingredients are mixed by ball milling, and after drying, they are pressed into shape under a pressure of 2MPa, with a diameter of 10mm and a thickness of 1mm. Sinter at 1150°C for 4h with a heating rate of 6°C / min. The dielectric properties of the fired ceramic pieces were measured after firing silver on the surface. The dielectric properties of the obtained ceramic samples are shown in Table 1. Figure 5 The curve shows the dielectric temperature characteristic curve of the sample. Image 6 Give the volumetric temperature change rate curve of the samp...

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Abstract

A ceramic material used for X7R-model multi-layer ceramic capacitor with medium or low sinter temp and high temp stability is prepared from barium titanate and the additive chosen from cobalt oxide and niobium oxide, or their compound, yttrium oxide, RE oxide, Ag, zinc oxdie and boron oxide, or their compound. It has dielectric constant of 1800-5600, capacitance-temp variation rate less than + / -15%, and sinter temp of 900-1150 deg.C.

Description

technical field [0001] The invention belongs to the technical field of capacitor materials, in particular to a temperature-stable multilayer ceramic capacitor ceramic material sintered at a medium and low temperature. Background technique [0002] With the rapid development of various types of electronic equipment such as digital cameras, mobile phones, notebook computers, handheld computers and other mobile electronic equipment, miniaturization and light weight are inevitable trends, and the components that make up these electronic equipment must also be reduced in size And weight, in order to adapt to the needs of the installation technology of electronic components to surface mount technology (SMD), the components required by surface mount technology are chip components. Multilayer ceramic capacitors are the most widely used type of chip components. Multilayer Ceramic Capacitors (Multilayer CeramicCapacitors) referred to as MLCC. It stacks the electrode material and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/63
Inventor 王晓慧陈仁政马超雷震王浩李龙土桂治轮
Owner TSINGHUA UNIV
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