Method for preparing polycrystal texture ceramic material

A ceramic material and texture technology, applied in the field of material science, can solve the problems of large size of template seedlings, difficult template, not meeting environmental protection requirements, etc., and achieve the effect of reliable quality, reliable principle and stable performance.

Inactive Publication Date: 2006-10-25
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the problem is that although this process improves the material performance, it still uses the lead element which is harmful to the environment. It is a non-environmentally coordinated material and does not meet the environmental protection requirements.
The main problems are: 1) The size of the currently used template seedlings is relatively large, so it is difficult to arrange an appropriate amount of templates in a...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Electric field effect assisted preparation process of alumina textured ceramic material.

[0025] Select lightly burned γ-alumina micropowder with an average particle size of 1-10 microns, add 2wt% equimolar silica and magnesia eutectic powder, and then add 3wt% lamellar α-alumina made by molten salt method. Alumina micropowder was wet-mixed in a ball mill for 4 hours, then dried, and molded into a 10×10×4mm green body sample under a pressure of 100Mpa by a bidirectional pressure molding method.

[0026] After the green body sample is dried at 120°C, it is placed horizontally in the high-temperature working area of ​​the high-temperature electric furnace, and a pair of high-temperature electrodes are arranged on both sides of the sample along the rectangular side length of the sample. During the sintering process of the sample, when the temperature reached 800 °C, a DC electric field of 400 V / mm was applied to the sample by the electrode until the sintering p...

Embodiment 2

[0027] Example 2: Electric field effect assisted preparation process of barium titanate textured ceramic material.

[0028] Select barium titanate micropowder with an average particle size of 1-10 microns, add 4wt% lamellar strontium titanate micropowder made by the molten salt method, wet mix in ball mill for 4 hours, dry, and shape by extrusion , along the extrusion direction is the length and width direction of the sheet-like sample, and the blank sample with a size of 15×15×5mm is cut for processing.

[0029] After the green body sample is dried at 120°C, it is placed in the high-temperature working area of ​​the high-temperature electric furnace and placed horizontally. A pair of high-temperature electrodes are arranged on the side of the sample along the parallel side length direction, and the double electrode pairs are arranged at 90 degrees of intersection. During the sintering process of the sample, when the temperature reached 600°C, a DC electric field of 800V / mm wa...

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PUM

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Abstract

This invention relates to polycrystal texture ceramic material preparation method, it includes preparation technique principle and corresponding technique method. Diffusion route of ion and polar particle in high temperature field can be affected by electrostatic field, the characteristic is used to induct crystal nucleus growth process and reinforce anisotropy growth to form texture polycrystal material. Different strength orientation electric field is applied, and the strength is related to material system different component, core forming and crystal growth speed, anisotropy radius-thickness ratio expected, and electric breakdown strength of environment and materials. The anisotropy growth of polusrystal texture made is appreciable, polyspinal deformity is uniform, breaking tenacity and fracture toughness of material on wishful direction can be improved. Directed dielectric property can be great improved, and material piezoelectric constant and electromechanical conpling factor can be improved, dielectric loss can be reduced.

Description

Technical field: [0001] The invention belongs to the field of material science, and relates to a process method for preparing polycrystalline textured ceramic materials using the auxiliary principle of electric field force effect, which is called an electric field intervention method for preparing polycrystalline textured ceramic materials. technical background: [0002] In the ceramic material preparation process technology, most of them involve the main process steps such as raw material dispersion and mixing, molding, and sintering. Among them, sintering is the most critical technical step for the porous green body to form a predetermined chemical composition and desired microstructure. In this process, high temperature is mainly relied on to provide a driving force for the sintering process of material densification and formation of a predetermined microstructure. The high temperature source may be fuel heat, electrical energy, microwave energy, or the like. In order t...

Claims

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Application Information

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IPC IPC(8): C04B35/63C04B35/64
Inventor 隋万美
Owner QINGDAO UNIV
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