Steam Oxidation Resistance of Silicon Carbide Castables at Elevated Temperatures

doi:10.19691/j.cnki.1004-4493.2021.03.005

China's Refractories ›› 2021, Vol. 30 ›› Issue (3): 23-27.DOI: 10.19691/j.cnki.1004-4493.2021.03.005

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Steam Oxidation Resistance of Silicon Carbide Castables at Elevated Temperatures

SHI Huiying, WANG Jiaping^*(), WU Jiguang, HUANG Zhigang, QIN Hongbin

Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China

Online:2021-09-15 Published:2021-11-26
Contact: WANG Jiaping
About author:Shi Huiying gained his bachelor’s degree from Wuhan University of Science and Technology in 2001 and his master’s degree from Tianjin University in 2008, respectively. Since 2001, he has been working in Sinosteel Luoyang Institute of Refractories Research Co., Ltd.

Abstract

Abstract:

Silicon carbide castables of different SiC contents (86% and 71%, by mass) were prepared using white fused corundum, silicon carbide particles and fines, activated alumina powder, silica fume and pure calcium aluminate cement as main starting materials, heat treating at 1 000 ℃ for 3 h, and oxidizing in steam atmosphere at 1 000 ℃ for different durations (100, 200, 300, 400 and 500 h). The mass and volume before and after oxidation, the bulk density, the apparent porosity and the cold compressive strength were tested. The phase composition and the microstructure before and after oxidation were analyzed by XRD and SEM. The results indicate that: (1) within 300 h of oxidation duration, silicon carbide shows an increasing oxidation rate; however, the oxidation rate is low during 300-500 h of oxidation duration; 2) the oxidation rate of the specimen with 71% SiC is slightly higher than the one with 86% SiC; 3) with the increasing oxidation degree of silicon carbide, the apparent porosity of the specimens tends to increase, followed by the declining bulk density and cold compressive strength.

Key words: silicon carbide, refractory castables, steam, oxidation, oxidation resistance

SHI Huiying, WANG Jiaping, WU Jiguang, HUANG Zhigang, QIN Hongbin. Steam Oxidation Resistance of Silicon Carbide Castables at Elevated Temperatures[J]. China's Refractories, 2021, 30(3): 23-27.

Figures/Tables 9

Table 1 Formulations of specimens /mass%

Starting materials	Sample 1^#	Sample 2^#
SiC particles	56	41
White fused corundum particles	4	19
SiC fines	30	30
Secar71	5	5
Silica fume	3	3
Activated alumina powder	2	2
Additive (extra adding)	0.12	0.12

Fig. 1 Appearance of specimens after 500 h oxidation

Fig. 2 Volume and mass change rates vs oxidation duration

Fig. 3 Bulk density and apparent porosity vs oxidation duration

Fig. 4 Cold compressive strength vs oxidation duration

Fig. 5 XRD patterns of specimens before and after oxidation

Table 2 Phase composition (excluded SiC) of samples before and after different oxidation durations /mass%

Item	Specimens 1^#					Specimens 2^#
Item	Corundum	CA₂	Anorthite	Cristobalite	Total	Corundum	CA₂	Anorthite	Cristobalite	Total
Before oxidation	5	3	3	<1	12	10-20	3	3	<1	17-27
Oxidation for 300 h	5	-	10-20	5	20-30	10	-	10-20	5-10	25-40
Oxidation for 500 h	3	-	20	10	33	10	-	20-30	5-10	35-50

Fig. 6 Microstructure of specimen 1# before and after 500 h oxidation

Fig. 7 Microstructure of specimen 2# before and after 500 h oxidation

References 8

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Steam Oxidation Resistance of Silicon Carbide Castables at Elevated Temperatures

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