Effect of Curing Temperature on Intermediate Temperature Properties of Calcium Aluminate Cement Bonded Corundum Castables

doi:10.19691/j.cnki.1004-4493.2021.03.007

China's Refractories ›› 2021, Vol. 30 ›› Issue (3): 33-36.DOI: 10.19691/j.cnki.1004-4493.2021.03.007

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Effect of Curing Temperature on Intermediate Temperature Properties of Calcium Aluminate Cement Bonded Corundum Castables

LI Ye¹, LIU Kun¹, DING Dafei¹, WANG Qingfeng², FU Xiaohui¹, YE Guotian¹^,^*()

1 Henan Key Laboratory of High Temperature Functional Ceramics, Zhengzhou University, Zhengzhou 450001, China
2 Materials Engineering Department, Luoyang Institute of Science and Technology, Luoyang 471023, China

Online:2021-09-15 Published:2021-11-26
Contact: YE Guotian
About author:Li Ye was born in 1991. He got his master’s degree on materials science from School of Materials Science and Engineering, Zhengzhou University in 2019. Currently, he is doing his Ph. D degree at University of Shizuoka in Japan. He has published more than 8 papers related to refractories.

Abstract

Abstract:

In order to study the effect of the curing temperature on the intermediate temperature properties of calcium aluminate cement bonded corundum castables, the prepared castables were cured at 5, 10, 25, 40 and 50 ℃, respectively, dried at 110 ℃ for 24 h and heat treated at 800 and 1 100 ℃, respectively. Then the apparent porosity, the cold modulus of rupture and the cold crushing strength were measured. The phase composition of castable matrix specimens treated under the same conditions and the influence of the curing temperature on the intermediate temperature strength of the castables were also analyzed. The results show that with the increase of the curing temperature, the hydration degree of calcium aluminate cement increases, which promotes the uniform distribution of hydration products with Al₂O₃ after decomposition, thus enhancing the intermediate temperature strength of castables.

Key words: curing temperature, calcium aluminate cement, corundum castable, intermediate temperature strength

LI Ye, LIU Kun, DING Dafei, WANG Qingfeng, FU Xiaohui, YE Guotian. Effect of Curing Temperature on Intermediate Temperature Properties of Calcium Aluminate Cement Bonded Corundum Castables[J]. China's Refractories, 2021, 30(3): 33-36.

Figures/Tables 6

Table 1 Formulation of refractory castables

Raw materials		mass /%
Tabular corundum T60/T64	6-3 mm	25
	3-1 mm	20
	1-0.5 mm	13
	0.5-0 mm	15
	≤0.045 mm	14
Reactive alumina	CL370	8
CAC	Secar 71	5
Dispersant	FS10	0.15 (extra-added)
Water demand		4.0 (extra-added)

Fig. 1 XRD patterns of castable matrix specimens after curing at 5, 10, 25, 40 and 50 °C and drying at 110 °C

Fig. 2 XRD patterns of castable matrix specimens after curing at 5, 10, 25, 40 and 50 °C and firing at 1 100 °C

Fig. 3 AP of castables cured and heat treated at different temperatures

Fig.4 CMOR and CCS of castables cured and heat treated at different temperatures

Fig. 5 Influence of curing temperature on distribution of hydration products and in situ generation of CA and CA2

References 16

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Effect of Curing Temperature on Intermediate Temperature Properties of Calcium Aluminate Cement Bonded Corundum Castables

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