Process for laser preparation of hexagonal phase barium titanate ceramic

A phase barium titanate and laser technology, which is applied in the field of preparation of hexagonal phase barium titanate ceramics, can solve the problems of impurity pollution, difficult control of the sintering process, long sintering time, etc., and achieve high repeatability, pollution-free sintering, and short preparation time short effect

Inactive Publication Date: 2005-08-17
CHENGDU 3D CHANGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the sintering time required by these two sintering technologies is relatively long, usually at least several hours; the sintering process is not easy to control; crucibles are required for sintering, which is likely to cause impurity pollution during high-temperature sintering

Method used

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  • Process for laser preparation of hexagonal phase barium titanate ceramic
  • Process for laser preparation of hexagonal phase barium titanate ceramic
  • Process for laser preparation of hexagonal phase barium titanate ceramic

Examples

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Effect test

Embodiment 1

[0027] Example 1: BaTiO is irradiated with German Rofin-sina RS2500 laser 3 Ceramic body; firstly, continuously increase the laser power density from 0 to sintering power density value of 466w / cm within 60s 2 , the rotation speed of the rotary table is 120° / s, after 20s of sintering time, then reduce the laser power to zero within 60s; the laser is turned off. The sample cools down to porcelain.

Embodiment 2

[0028] Example 2: BaTiO is irradiated with German Rofin-sina RS2500 laser 3 Ceramic body; firstly, within 50s, continuously increase the laser power density from 0 to the sintering power density value of 528w / cm 2 , the rotation speed of the rotary table is 90° / s, after 30s of sintering time, then reduce the laser power to zero within 50s; the laser is turned off. The sample cools down to porcelain.

Embodiment 3

[0029] Example 3: BaTiO is irradiated with German Rofin-sina RS2500 laser 3 Ceramic body; firstly, within 50s, continuously increase the laser power density from 0 to the sintering power density value of 590w / cm 2 , the rotation speed of the rotary table is 90° / s, after 25s of sintering time, then reduce the laser power to zero within 50s; the laser is turned off. The sample cools down to porcelain.

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Abstract

The present invention is laser preparation process of hexagonal barium titanate ceramic and belongs to the field of ceramic preparing technology. The preparation process includes the following steps: preparing barium titanate ceramic biscuit via traditional solid reaction process; irradiating the ceramic biscuit directly with great power laser in scanning mode through raising the laser power density from 0 to 466-777 W / sq cm in 10-60 sec, sintering for 20-60 sec and lowering laser power density continuously in 10-60 sec; and cooling to form the hexagonal barium titanate ceramic. The preparation process has short time and easy control, and can realize no-contamination sintering.

Description

technical field [0001] The invention belongs to the field of preparation of hexagonal barium titanate ceramics. Background technique [0002] As an excellent dielectric material, barium titanate-based ceramic materials are often widely used in the fields of electronic ceramics such as capacitors and positive temperature coefficient sensors. Barium titanate has five phase structures according to temperature changes, such as figure 1 , which are trigonal phase, orthorhombic phase, tetragonal phase, cubic phase and hexagonal phase. The barium titanate material of the hexagonal phase is used in the manufacture of microwave dielectric devices because of its microwave dielectric properties. The hexagonal phase is titanic acid The high-temperature phase of barium is stable only when the temperature is greater than 1430 degrees, so it is difficult to obtain hexagonal barium titanate ceramics at room temperature. This greatly limits the application of hexagonal barium titanate. At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/64
Inventor 蒋毅坚王伟于振龙季凌飞
Owner CHENGDU 3D CHANGE TECH
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