Preparation method of Co-base porous ceramic with adjustable and controllable pore structure

A technology of porous ceramics and pore structure, applied in the field of porous ceramic materials, can solve the problems of difficult control of density, high requirements for raw materials, uncontrollable pore structure, etc., and achieves the effect of simple and easy method and low cost.

Inactive Publication Date: 2013-08-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] These processes for preparing porous ceramics have the following disadvantages: (1) The pore structure cannot be adjusted,

Method used

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  • Preparation method of Co-base porous ceramic with adjustable and controllable pore structure
  • Preparation method of Co-base porous ceramic with adjustable and controllable pore structure
  • Preparation method of Co-base porous ceramic with adjustable and controllable pore structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) with La 2 o 3 、Co 3 o 4 and SrCO 3 As the raw material, the molar ratio of La:Sr:Co is 0.8:0.2:1 to calculate the required raw materials, weigh and mix the raw materials, and then grind for 1.5h to obtain the mixed powder, and then press the mixed powder into a cylindrical shape , where the diameter is 2cm, the thickness is 4mm, the final pressure used is 24MPa, and the pressure is kept for 3min for every increase of 2MPa;

[0023] (2) Pre-fire the compressed tablet obtained in step (1) at a temperature of 880°C, a holding time of 15 hours, and a pre-fire atmosphere of air to obtain pre-fired ceramics;

[0024] (3) After the pre-fired ceramic obtained in step (2) drops to room temperature, grind for 1 hour, and then press into a cylindrical shape with a diameter of 2cm and a thickness of 5mm. The final pressure used is 30MPa, and the pressure is kept for every 3MPa increase. 5min, and then carry out secondary sintering at a temperature of 1100°C, a holding time...

Embodiment 2

[0026] (1) with La 2 o 3 、Co 3 o 4 and SrCO 3 As the raw material, the molar ratio of La:Sr:Co is 0.5:0.5:1 to calculate the required raw materials, weigh and mix the raw materials, and then grind for 2 hours to obtain the mixed powder, and then press the mixed powder into a cylindrical shape, The diameter is 2cm, the thickness is 2mm, the final pressure used is 20MPa, and the pressure is kept for 1min for every increase of 4MPa;

[0027] (2) Pre-fire the compressed tablet obtained in step (1) at a temperature of 1050°C, a holding time of 10 hours, and a pre-fire atmosphere of air to obtain pre-fired ceramics;

[0028] (3) After the pre-fired ceramic obtained in step (2) drops to room temperature, grind for 1.5 hours, and then press into a cylindrical shape with a diameter of 2cm and a thickness of 4mm. The final pressure used is 20MPa, and every increase of 4MPa will keep the Pressing for 1min, and then performing secondary sintering at a temperature of 1200°C, a holding...

Embodiment 3

[0030] (1) with La 2 o 3 、Co 3 o 4 and SrCO 3 As a raw material, calculate the required raw materials with a molar ratio of La:Sr:Co of 0.1:0.9:1, weigh and mix the raw materials, and then grind for 1 hour to obtain a mixed powder, and then press the mixed powder into a cylindrical shape, The diameter is 2.5cm, the thickness is 5mm, the final pressure used is 30MPa, and the pressure is kept for 5min for every increase of 3MPa;

[0031](2) Pre-fire the compressed tablet obtained in step (1) at a temperature of 850°C, a holding time of 20 hours, and a pre-fire atmosphere of air to obtain pre-fired ceramics;

[0032] (3) After the pre-fired ceramic obtained in step (2) drops to room temperature, grind for 2 hours, and then press into a cylindrical shape with a diameter of 2.5cm and a thickness of 2mm. The pressure used is 6MPa, and the pressure is kept for every increase of 2MPa 4min, and then carry out secondary sintering at a temperature of 1250°C, a holding time of 20h, a...

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Abstract

The invention discloses a preparation of Co-base porous ceramic with an adjustable and controllable pore structure. The Co-base porous ceramic is prepared from La2O3, Co3O4 and SrCO3, and is prepared by the following steps of: calculating required raw materials at a mol ratio of (1-x):x:1 of La:Sr:Co, wherein x ranges from 0 to 1; weighing and mixing the raw materials, grinding the raw materials to obtain mixed powder, and tableting the mixed powder; pre-sintering obtained tablets to obtain pre-sintered ceramic; cooling the pre-sintered ceramic to room temperature and grinding; and tableting the ceramic and sintering for the second time, so as to obtain the La(1-x)SrxCoO3 porous ceramic. The obtained La(1-x)SrxCoO3 porous ceramic material is 14-19% in porosity, 4.5-6.5g/cm<3> in density and 75-90% in relative density. The method is simple and easy to implement, and low in cost; and the preparation method of the perovskite type Co-base porous ceramic which is adjustable and controllable in pore structure and uniform in distribution, by changing the doping amount of a Sr element, can achieve control on the pore structure and the porosity.

Description

technical field [0001] The invention relates to a method for preparing porous ceramics, in particular to a method for preparing a Co-based porous ceramic with an adjustable pore structure, and belongs to the technical field of porous ceramic materials. Background technique [0002] Porous ceramics contain uniformly distributed and interconnected micropores or pores, so they have high porosity and permeability, large specific surface area, small bulk density, low thermal conductivity, and high mechanical strength. , high temperature resistance, wear resistance, and the pore shape, pore size and distribution that can be adjusted in three-dimensional space. As a new type of green functional material, porous ceramics can increase the effective contact area in the catalyst carrier and improve the catalytic efficiency by using its large specific surface area; by using its large porosity and low thermal conductivity, it can It can be used as heat exchange material, heat insulation...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/01C04B35/622
Inventor 虞澜王勇杜小丽倪佳覃永雄傅佳
Owner KUNMING UNIV OF SCI & TECH
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