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High thermal stability titanium dioxide-based ceramic material and preparation method thereof

A technology of high thermal stability and ceramic materials, applied in the field of ceramic materials, can solve the problems of not meeting the application standards of X9F or X9E ceramic capacitors, poor thermal stability of titanium dioxide-based ceramics, high dielectric loss and loss of application value, etc., to achieve low dielectric Power loss, high yield, and strong practicality

Inactive Publication Date: 2019-01-04
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers first obtained a high dielectric constant in titanium dioxide-based ceramics single-doped with pentavalent ions, but lost its application value due to high dielectric loss; then used titanium dioxide-based ceramics co-doped with ions in different valence states to perfectly solve the problem. solved the problem of high dielectric loss, but the thermal stability of the reported titanium dioxide-based ceramics is poor, and most of them cannot meet the application standards of X9F or X9E ceramic capacitors
For example, patent application number 201810056248.8, its capacitance change rate can only meet the X9R requirements; patent application number 201711013960.1, 201711021284.2, although its capacitance change rate is between ±10%, but the temperature range is narrow

Method used

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  • High thermal stability titanium dioxide-based ceramic material and preparation method thereof
  • High thermal stability titanium dioxide-based ceramic material and preparation method thereof
  • High thermal stability titanium dioxide-based ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. According to (Cu 1 / 4 Nb 3 / 4 ) 0.005 Ti 0.995 o 2 The stoichiometry of raw materials were weighed Cu 2 O (purity 99.9%) 0.0222g, Nb 2 o 5 (purity 99.99%) 0.1238g, TiO 2 (purity 99.5%) 19.8539g, and pack in the nylon tank, be ball milling medium with zirconium ball, dehydrated alcohol, the mass ratio of dehydrated alcohol and raw material mixture is 1:1.2, ball mills with ball mill 401 revolutions per minute After 24 hours, the zirconium balls were separated, the raw material mixture was dried at 80° C. for 24 hours, and ground with a mortar for 30 minutes to obtain a raw material mixture.

[0023] 2. Put the raw material mixture in an alumina crucible, cover it, heat it up to 1100°C at a heating rate of 3°C / min and keep it warm for 3 hours, cool it down to room temperature naturally, take it out of the furnace, and grind it with a mortar for 5 minutes to obtain a calcined powder.

[0024] 3. Put the calcined powder into a nylon tank, use zirconium balls as gri...

Embodiment 2

[0026] In this embodiment, according to (Cu 1 / 4 Nb 3 / 4 ) 0.01 Ti 0.99 o 2 The stoichiometry of raw materials were weighed Cu 2 O (99.9%) 0.0444g, Nb 2 o 5 (99.99%) 0.2471g, TiO 2 (99.5%) 19.7085g, in the air atmosphere in the tube furnace, under airtight conditions, the temperature is first raised to 1000 °C in 100 minutes, and then the temperature is raised to 1350 °C at a heating rate of 2 °C / min, and the temperature is kept for 10 hours. Other steps and implementation The same as in Example 1, a titania-based ceramic material was obtained.

Embodiment 3

[0028] In this embodiment, according to (Cu 1 / 4 Nb 3 / 4 ) 0.02 Ti 0.98 o 2 The stoichiometry of raw materials were weighed Cu 2 O (99.9%) 0.0883g, Nb 2 o 5 (99.99%) 0.4920g, TiO 2 (99.5%) 19.4196g, in the air atmosphere in the tube furnace, under airtight conditions, the temperature is first raised to 1000 °C in 100 minutes, and then the temperature is raised to 1360 °C at a heating rate of 2 °C / min, and the temperature is kept for 10 hours. Other steps and implementation The same as in Example 1, a titania-based ceramic material was obtained.

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Abstract

The invention discloses a high thermal stability titanium dioxide-based ceramic material and a preparation method thereof. The ceramic material has the formula of (Cu1 / 4M3 / 4)xTil-xO2, in the formula,M represents Nb or Ta, and x is 0.005-0.02. The ceramic material disclosed by the invention is simple in preparation method, good in repeatability and high in finished product rate; due to introduction of CuNb or CuTa into the titanium dioxide-based ceramic material, the ceramic material has a high dielectric constant and a low dielectric loss within a frequency of 40-160Hz, when x is 0.005, the dielectric loss is constantly kept as 0.08 or less within a frequency testing range, meanwhile, the ceramic material has high thermal stability, and within a temperature range of minus 200 DEG C to 200DEG C, CuNb or CuTa codoped titanium dioxide ceramic respectively meets application requirements of X9F and X9E ceramic capacitors. Compared with an X9R ceramic capacitor, the ceramic material disclosed by the invention has a low capacitance change rate and good thermal stability and practicability, and has the potential of being applied to electronic markets such as multi-layer ceramic capacitors.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a titanium dioxide-based ceramic material with high dielectric constant, low dielectric loss and high thermal stability and a preparation method thereof. Background technique [0002] With the development of the electronic information age, ceramic materials, as important functional materials, are widely used in many fields such as capacitors, memories, and microelectronic components. ) has a wide range of application prospects, and has been paid more attention by scholars. However, due to the increasingly wide range of applications of MLCC, the upper limit temperature of ceramic materials is required to continue to increase. For example, anti-lock braking systems, air / fuel ratio control modules, etc. in the automotive control field, as well as high-power phased array radars, armored vehicles, and missile-borne / ship-borne circuits all require the operating t...

Claims

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Application Information

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IPC IPC(8): C04B35/46C04B35/622
CPCC04B35/46C04B35/622C04B2235/3251C04B2235/3281C04B2235/9607
Inventor 梁朋飞彭惠杨祖培晁小练
Owner SHAANXI NORMAL UNIV
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