Preparation method of porous ceramics

A technology of porous ceramics and mixed powder, applied in the field of porous ceramic materials, can solve the problems of long time, difficult control of process conditions, cumbersome preparation process, etc.

Inactive Publication Date: 2014-03-19
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

Zhu Shizhen et al. (Zhu Shizhen, Zhao Zhenbo, Liu Qingguo. Preparation Technology of Porous Ceramic Materials. Materials Science and Engineering, 1996,14(3):33-39) reported that the method of adding pore-forming agents can produce complex shapes and various pore structures. products with poor porosity; the organic foam impregnation method can produce products with high porosity, but cannot produce products with small pores and closed pores; the sol-gel method is suitable for the production of microporous ceramics and thin film materials. The pores of the obtained product are evenly distributed, but the productivity is low, and the shape of raw materials and products is limited; the foaming method is suitable for producing products with closed pores, but the requirements for raw materials are high, and the process conditions are not easy to control
[0004] for Sr 3 YCo 4 o 10.5 This type of material system doped with Sr site or Co site is mainly prepared by the combination of solid state reaction method and secondary sintering. This preparation process requires secondary grinding, secondary tableting, Secondary sintering, the preparation process is cumbersome and time-consuming, and for Sr doped with Cu at the Co site 3 YCo 4 o 10.5 Porous ceramic materials have not been reported in the literature

Method used

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Examples

Experimental program
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Embodiment 1

[0020] The porous ceramic material described in this embodiment is Sr doped with Cu at the Co site. 3 YCo 4 o 10.5 Porous ceramics, its preparation method comprises the steps:

[0021] (1) Weigh SrCO according to the molar ratio of Sr:Y:Co of 3:1:4 3 , Y 2 o 3 、Co 3 o 4 Mix it evenly and grind it for 2 hours to get the mixed powder;

[0022] (2) Compress the mixed powder obtained in step (1) into tablets. The conditions for tablet compression are as follows: increase the pressure of the tablet press from 0MPa to 20MPa, and keep the pressure for 2 minutes for each increase of 2MPa;

[0023] (3) The mixed powder after tableting is sintered in the air to obtain a porous ceramic material after sintering, wherein the sintering temperature is 1110° C. and the holding time is 24 hours.

[0024] The Sr prepared in this example 3 YCo 4 o 10.5 Porous ceramic material, its XRD and SEM images are shown in figure 1 and figure 2 .

Embodiment 2

[0026] The porous ceramics described in this example are Sr doped with Cu at the Co site. 3 YCo 3.8 Cu 0.2 o 10.5 Porous ceramics, a preparation method thereof, comprising the steps of:

[0027] (1) Weigh SrCO according to the molar ratio of Sr:Y:Co:Cu: 3:1:3.8:0.2 3 , Y 2 o 3 、Co 3 o 4 , CuO to make it evenly mixed and then grind for 1h to obtain mixed powder;

[0028] (2) Compress the mixed powder obtained in step (1). The diameter of the tablet is 2cm and the thickness is 4mm. Press for 5 minutes;

[0029] (3) Sinter the mixed powder after tableting in the air, and get Sr after sintering 3 YCo 3.8 Cu 0.2 o 10.5 The porous ceramic material, wherein the sintering temperature is 1000° C., and the holding time is 24 hours.

[0030] The Sr prepared in this embodiment 3 YCo 3.8 Cu 0.2 o 10.5 Porous ceramic material, its XRD and SEM images are shown in image 3 and Figure 4 .

Embodiment 3

[0032] The porous ceramics described in this example are Sr doped with Cu at the Co site. 3 YCo 3.6 Cu 0.4 o 10.5 Porous ceramics, its preparation method comprises the steps:

[0033] (1) Weigh SrCO according to the molar ratio of Sr:Y:Co:Cu: 3:1:3.6:0.4 3 , Y 2 o 3 、Co 3 o 4 , CuO to make it evenly mixed and then grind for 2 hours to obtain mixed powder;

[0034] (2) Compress the mixed powder obtained in step (1). The diameter of the tablet is 2cm and the thickness is 4mm. Press for 1min;

[0035] (3) Sinter the mixed powder after tableting in the air, and get Sr after sintering 3 YCo 3.6 Cu 0.4 o 10.5 Porous ceramics, wherein the sintering temperature is 1150° C., and the holding time is 15 hours.

[0036] The Sr prepared in this example 3 YCo 3.6 Cu 0.4 o 10.5 Porous ceramics, whose XRD and SEM images are shown in Figure 5 and Figure 6 .

[0037] From figure 1 ,3 In the XRD figure shown in , 5, it can be seen that the phase Sr prepared by the present...

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Abstract

The invention discloses a preparation method of porous ceramics. The method is realized through the following technical scheme: SrCO3, Y2O3, Co3O4 and CuO are adopted as raw materials, the raw materials are calculated and measured in a molar ratio of Sr: Y: Co: Cu of 3: 1: (4-x): x, and the raw materials are mixed, ground, tabletted and sintered to obtain the Sr3YCo[4-x]CuxO10.5 porous ceramic material, wherein when x is equal to 0 to 0.4, the synthesized Sr3YCo[4-x]CuxO10.5 is a single phase. By utilizing the method, under the situation that the Sr3YCo[4-x]CuxO10.5 is determined as a single phase, the porous structure can be varied regularly. The method is simple and easy and low in cost.

Description

technical field [0001] The present invention relates to a kind of preparation method of porous ceramics, especially a kind of Sr doped with Cu at Co site 3 YCo 4 o 10.5 The invention discloses a method for preparing porous ceramics, belonging to the technical field of porous ceramic materials. Background technique [0002] Porous ceramics are a type of ceramic material with pores as the main phase, and its development began in the 1870s. Porous ceramics have the characteristics of large specific surface area, low thermal conductivity, high mechanical strength, high temperature resistance, wear resistance, uniform distribution of pores, and adjustable pore shape and pore diameter in three-dimensional space. Its application involves many fields such as biology, energy, smelting, pharmaceuticals, cement, environmental protection, and chemical industry, and plays a pivotal role in the development of the national economy. [0003] Porous structure and pore size are the key to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/32C04B35/622
Inventor 虞澜杜小丽秦梦李国芳宋世金
Owner KUNMING UNIV OF SCI & TECH
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