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Method of preparing functional ceramic material

A technology of functional ceramics and premixed liquid, applied in the field of preparing functional ceramic materials, can solve the problems of deformation and bending of ceramic body, slow down drying rate, large size, etc., to prevent deformation and cracking, shorten drying time, and ensure uniformity. Effect

Active Publication Date: 2008-02-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when Gel-casting is used to prepare large-scale functional ceramics, due to the high water content compared with the molding method, the size is large. During the drying process, the drying rate of each part is not equal, which can easily lead to deformation, bending and cracking of the ceramic body. Maintain uniformity, and slow down the drying rate, the drying time will be as long as one month or even two months
Through a large number of literature searches, no report was found on the preparation of large-scale functional ceramics by gel injection molding technology combined with mesh fixture drying method

Method used

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  • Method of preparing functional ceramic material
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  • Method of preparing functional ceramic material

Examples

Experimental program
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Effect test

example 1

[0021] Preparation of large size 0.15(PbZn 1 / 3 Nb 2 / 3 o 3 )+0.85[Pb(Zr 0.54 Ti 0.46 )O 3 ]Piezoelectric Ceramics.

[0022] The specific process is:

[0023] (1) by chemical formula, prepare PZN-PZT powder with solid phase synthesis method;

[0024] (2) 500g powder was mixed with 65.8ml premix, 25g dispersant and 1.75g ​​initiator and ball milled for 2 hours to prepare a slurry with a solid phase content of 50vol% and a viscosity of 90mPa.s;

[0025] (3) Pour out the slurry, add catalyzer 0.8g, pour in the annular mold of Φ 21cm, the mold is the glass plate that the surface is stuck with metal ring, so that demoulding;

[0026] (4) The mold is placed in the air for 24 hours and demoulded, and then put into a mesh fixture, wherein the mesh fixture is a square steel wire mesh with two side lengths of 25cm, and the four sides are fixed with steel bars, and then the four sides of the steel bars are fixed. Drill four screw holes at the corner to clamp the two steel meshes to...

example 2

[0034] Preparation of large-sized Pb[(Mn 0.3 Nb 0.7 ) 1 / 2 (Mn 0.3 Sb 0.7 ) 1 / 2 ] 0.2 (Zr 95 Ti 5 ) 0.8 o 3 Pyroelectric ceramics. According to the chemical formula, the powder is prepared by the solid phase synthesis method, the sintering temperature is 1240°C, and the others are the same as in Example 1. The size of the ceramic after sintering is Φ15.8cm, and the density is 7.51g / cm 3 , using the same method to test its dielectric constant is 251, dielectric loss is 4%, pyroelectric coefficient is 7.5×10 -4 C / m 2 °C (30 °C), the dielectric constant uniformity is 4.8%, and its SEM image is shown in Figure 3.

example 3

[0036] Preparation of large-sized Ba by water-based gel injection molding combined with mesh fixture drying method 0.7 Sr 0.3 TiO 3 Pyroelectric ceramics.

[0037] The specific process is:

[0038] (1) by chemical formula, prepare BST powder with solid-phase synthesis method;

[0039] (2) 300g powder was mixed with 50ml premix, 15g dispersant and 1.35g initiator and ball milled for 2 hours to prepare a slurry with a solid phase content of 48vol% and a viscosity of 110mPa·s;

[0040] (3) pour out the slurry, add catalyst 0.7g, inject in the mold, and pour in the mold of Φ 16cm;

[0041] (4) Place the mold in the air for 24 hours before demoulding, put in the mesh fixture, put the fixture in a constant temperature and humidity box, place it in a humidity of 95% and a temperature of 10°C for three days, then adjust it to a humidity of 80%, Place it in a temperature of 25°C for two days, then adjust it to a humidity of 65% and a temperature of 30°C for three days;

[0042](5...

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Abstract

The invention discloses a preparation method of functional ceramics material and comprises the steps: (1) suspending liquid containing organic monomer, cross linker, evocating agent, dispersant and ceramics powder lot is prepared; (2) catalyst is added, slurry is injected into a ring mental die to be solidified in situ and wet rough-body of large size ceramics is obtained; (3) after being demoulded, the rough-body is put into a net clamp, the clamp is put into a climatic chamber to be dried and then put into an oven to be dried after a plurality of days; (4) the dried rough-body is batched out under certain temperature rising system and sintered into ceramics under high temperature. The invention prepares large size high performance lead zinc niobate-lead zirconate titanate piezoceramics, barium strontium titanate pyroelectric ceramics, lead manganese niobate-lead manganese stibate-lead zirconate titanate pyroelectric ceramics.

Description

technical field [0001] The invention relates to a method for preparing a functional ceramic material. The method adopts water-based gel injection molding and a net-like fixture drying method to prepare a large-scale high-performance functional ceramic material. Background technique [0002] The engineering preparation technology of large-scale functional ceramics is a technical difficulty that many researchers have paid attention to in recent years. Due to the size, all aspects of the preparation process of such products are much more difficult than those of small-size products. : It is difficult to achieve the overall uniformity of the molded body; the strength of the molded body is low, and it is difficult to ensure that it will not be damaged (deformed or cracked) in the subsequent process; it is difficult to achieve various process links in the process from the powder state to the final product Smooth, consistent evolution, etc. [0003] Based on this, the gel-casting t...

Claims

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Application Information

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IPC IPC(8): C04B35/632
Inventor 谢甜甜姜胜林曾亦可张海波
Owner HUAZHONG UNIV OF SCI & TECH
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