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Pyroelectric ceramic materials and gel casting method thereof

A technology of pyroelectric ceramics and preparation process, which is applied to clay products, other household utensils, household utensils, etc., and can solve problems such as rough surface, increased production cycle and manufacturing cost, and oxygen resistance effect

Inactive Publication Date: 2008-01-16
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing gel injection molding technology has the following disadvantages: 1. Almost all organic monomers are toxic, such as acrylamide, which has neurotoxicity; It needs to be degreased before, thus increasing the production cycle and manufacturing cost; 3. There is an oxygen resistance effect, and the surface is not smooth

Method used

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  • Pyroelectric ceramic materials and gel casting method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] 1) Mix the raw materials according to the following proportions. Ball milling is to add deionized water and powder to mix. The ball milling time is 4 hours. The drying temperature is 100°C. The drying time is 12 hours. The sieve is 60 mesh. 200°C / h, and the pre-burning temperature is 800°C. The ratio of each raw material is: Pb 3 o 4 : 192.45, La 2 o 3 : 16.29, CaCO 3 : 10.11, TiO 2 : 78.29.

[0027] 2) Dissolve ethyl silicate in a mixture of deionized water and alcohol, then add hydrochloric acid, mix and stir, and prepare a hydrolyzate, whose volume ratio V 硅酸乙脂 :V 去离子水 :V 酒精 :V 盐酸 =1:0.4:0.2:0.004;

[0028] 3) Mix and stir the pyroelectric ceramic powder and hydrolyzate evenly to make a slurry, whose volume ratio V PLCT :V 水解液 =4:5;

[0029] 4) The slurry is defoamed by vacuum and poured in the mould;

[0030] 5) Adjust the pH value of the slurry to 2 by dropping hydrochloric acid to make the slurry solidify rapidly, and then dry it at 25°C for 2 days t...

example 2-6

[0033] According to the steps described in Example 1, the raw materials were processed using the process parameters in Table 1, and the electrical properties of the obtained ceramic materials are shown in Table 2.

[0034] Table I

[0035]

example

raw material

Sintering temperature

Pb 3 o 4

La 2 o 3

CaCO 3

TiO 2

2

192.45

16.29

10.11

78.29

1130

3

192.45

16.29

10.11

78.29

1200

4

168.39

24.44

15.17

77.29

1150

5

168.39

16.29

20.22

78.29

1150

6

168.39

32.58

10.11

76.28

1150

[0036] Table II

[0037] example

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Abstract

The invention discloses a pyroelectric ceramic material with Pb1-x-yLaxCayTi1-x / 4O3 (x, y=0.1-0.2) as structural formula, which comprises the following steps: 1. blending Pb3O4, La2O3, CaCO3 and TiO2; grinding; drying; sieving; prefiring; balling; drying; sieving to obtain powder material; 2. dissolving ethyl silicate in the compound solution of deionized water and alcohol; adding alcaine; blending; stirring to prepare hydrolytic liquid; 3. blending powder material and hydrolytic liquid evenly to prepare slurry; 4. casting the slurry in the mould through vacuum debubbling; adjusting pH value; solidifying slurry block; drying to mould; 5. sintering the mould at 1100-1200 deg.c; insulating to obtain the product.

Description

technical field [0001] The invention belongs to the technical field of ceramic preparation, in particular, it relates to a double-doped lead titanate Pb doped with lanthanum and calcium 1-x-y La x Ca y Ti 1-x / 4 o 3 (PLCT for short) the preparation method of pyroelectric ceramics. Background technique [0002] The molding methods of ceramic materials can generally be divided into two categories: dry method and wet method. In the past, pyroelectric ceramics were usually formed by traditional dry pressing method, but this is only suitable for the manufacture of pyroelectric ceramic products with relatively simple shapes and structures. In early 1990, the Oak Ridge National Laboratory of the United States invented a brand-new wet molding technology for ceramic materials - gel-casting technology (Gel-casting). It has outstanding advantages such as uniform body composition, uniform density, less defects, not easy to deform, easy to form complex shape parts and strong practic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C04B35/624C04B33/28
Inventor 姜胜林曾亦可张洋洋邓传益张海波胡勇
Owner HUAZHONG UNIV OF SCI & TECH
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