Preparation and Properties of Calcium Hexaaluminate Porous Ceramics

doi:10.19691/j.cnki.1004-4493.2020.01.003

China's Refractories ›› 2020, Vol. 29 ›› Issue (1): 15-19.DOI: 10.19691/j.cnki.1004-4493.2020.01.003

• Original article • Previous Articles Next Articles

Preparation and Properties of Calcium Hexaaluminate Porous Ceramics

WANG Gang^*(), ZHANG Qi, HAN Jianshen, YUAN Bo, LI Hongxia

State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China

Online:2020-01-10 Published:2020-01-10
Contact: WANG Gang
About author:Wang Gang received his doctor’s degree in materials science from Shanghai Institute of Ceramics, Chinese Academy of Sciences in 2004. Now he is the director of Research and Development Center of Sinosteel Luoyang Institute of Refractories Research, vice director of State Key Laboratory of Advanced Refractories. His research field mainly covers advanced refractories and high-performance ceramics. He has presided over and participated in more than 10 research projects and published more than 60 research papers and 20 patents.

Abstract

Abstract:

In this paper, calcium hexaaluminate (CA₆) porous ceramics were prepared by a foaming method combined with cement solidification molding. The effects of the foaming agent addition on the microstructure and the properties of the ceramics were studied. The results show that the microstructure and the porosity of the ceramics can be controlled by adjusting the addition of the foaming agent. As the addition of the foaming agent increased, the bulk density reduced from 1 g · cm^-3 to 0.35 g · cm^-3, the porosity increased from 70.4% to 89.6%, the compressive strength reduced from 18.46 MPa to 1.66 MPa, and the thermal conductivity at 1 000 °C decreased from 0.382 W · m^-1 · K^-1 to 0.144 W · m^-1 · K^-1. It is indicated that calcium hexaaluminate porous ceramics with low density, high strength and low thermal conductivity can be obtained by the foaming method. As the lining material of high temperature electric furnaces, the ceramic has excellent energy saving effect.

Key words: calcium hexaaluminate, porous ceramics, foaming method

WANG Gang, ZHANG Qi, HAN Jianshen, YUAN Bo, LI Hongxia. Preparation and Properties of Calcium Hexaaluminate Porous Ceramics[J]. China's Refractories, 2020, 29(1): 15-19.

Figures/Tables 8

Fig. 1 Flow chart for preparation of CA6 porous ceramics

Fig. 2 Density and porosity of CA6 porous ceramics with different foaming agent additions

Fig. 3 Linear shrinkage of CA6 porous ceramics with different foaming agent additions

Fig. 4 Compressive strength of CA6 porous ceramics with different foaming agent additions at room temperature

Fig. 5 Microstructure of porous ceramic green bodies with different foaming agent additions before sintering

Fig. 6 Microstructure of CA6 porous ceramics with different foaming agent additions

Table 1 Thermal conductivity of CA6 porous ceramics with different foaming agent additions at 400, 600, 800 and 1 000 °C

Addition of foaming agent /g	Thermal conductivity /(W · m^-1 · K^-1)
Addition of foaming agent /g	400 ℃	600 ℃	800 ℃	1 000 ℃
50	0.103	0.115	0.128	0.144
45	0.132	0.141	0.156	0.174
40	0.170	0.174	0.183	0.191
35	0.186	0.201	0.209	0.215
30	0.256	0.272	0.278	0.287
25	0.356	0.365	0.374	0.382

Fig. 7 Energy-saving effect of CA6 porous ceramics (0.5 g?cm-3) and alumina bubble bricks

References 6

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Preparation and Properties of Calcium Hexaaluminate Porous Ceramics

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