Research on Steam Oxidation Resistance of Si3N4-bonded SiC Refractories

doi:10.19691/j.cnki.1004-4493.2020.01.009

China's Refractories ›› 2020, Vol. 29 ›› Issue (1): 44-47.DOI: 10.19691/j.cnki.1004-4493.2020.01.009

• Original article • Previous Articles

Research on Steam Oxidation Resistance of Si₃N₄-bonded SiC Refractories

CAO Huiyan^*(), HUANG Zhigang, ZHANG Xinhua, LIU Zhen

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: CAO Huiyan
About author:Cao Huiyan, born in 1982, obtained her master’s degree in 2008. Since then, she has been working in Sinosteel Luoyang Institute of Refractories Research Co., Ltd. She is skilled in technical services and engineering guidance for SiC refractories for blast furnaces, CDQ, heat treatment Muffle furnaces, and ceramic slurry pump. She has authored and co-authored about 30 papers.

Abstract

Abstract:

The steam oxidation of Si₃N₄-bonded SiC was determined at 1 000 ℃ for 50, 100, 150, 200, 250 and 300 h, respectively, according to ASTM C863-2000. The evolution of the phase composition and the microstructure as well as their relationship was investigated by XRD and SEM. The results show that the oxidation rate of Si₃N₄-bonded SiC is periodic. The presence of nitrogen element can impede the crystallization of SiO₂ glass; the local enrichment of CaO impurities is unfavorable for the existence of fibrous SiO₂. SiO₂ mainly exists as cristobalite when the CaO/SiO₂ ratio reaches a suitable level, but gradually transforms to quartz along with the oxidation time when the SiO₂ content increases, or the CaO/SiO₂ ratio decreases, due to the insufficient mineralization of CaO. The crystallization of SiO₂ glass, especially the formation of quartz is the key factor leading to the volume expansion and structural stress. When the cracks extend and reach the surface, the degradation of the material accelerates.

Key words: silicon nitride-bonded silicon carbide, steam oxidation resistance, phase composition, microstructure

CAO Huiyan, HUANG Zhigang, ZHANG Xinhua, LIU Zhen. Research on Steam Oxidation Resistance of Si₃N₄-bonded SiC Refractories[J]. China's Refractories, 2020, 29(1): 44-47.

Figures/Tables 11

Table 1 Experimental formulation

Starting materials	Particle size	mass%
SiC	1.43-2.5 mm	15
	0.5-1.43 mm	40
	0-0.5 mm	15
	≤0.044 mm	15
Si	≤0.044 mm	15

Fig. 1 Appearance of samples after oxidation

Fig. 2 Mass and volume change rates of samples after different oxidation durations

Fig. 3 Open porosity of samples after different oxidation durations

Fig. 4 XRD spectra of samples after different oxidation durations

Table 2 Phase composition of samples after different oxidation durations /mass%

Duration /h	Si₂N₂O	α-Si₃N₄	β-Si₃N₄	Cristobalite	Quartz	SiC
0	0	15	15	0	0	MAX
50	0	10-15	10-15	0	0	MAX
100	0	10	10	3	0	MAX
150	0	5-10	5-10	3	0	MAX
200	3-5	5-10	10	3	0	MAX
250	1-3	3	10	1-3	3-5	MAX
300	5	5	5	3-5	0	MAX

Table 3 Chemical composition of samples after different oxidation durations /mass%

Duration /h	Si₃N₄	SiC	SiO₂
150	18.95	67.56	9.56
300	19.78	65.89	10.61

Fig. 5 Microstructure of original sample

Fig. 6 Microstructure of sample after 50 h oxidation

Fig. 7 Microstructure of sample after 300 h oxidation

Fig. 8 Pore size distribution of samples after 300 h oxidation

[1]	Zhang Zhihua, Wang Wenwu, Wu Jiguang . Effects of B₄C additions on oxidation resistance of Si₃N₄ bonded SiC materials. Naihuo Cailiao (Refractories, in Chinese), 2017,51(1):28-31.
[2]	Thorsten Tonnesen, Rainer Telle . Quality control management of refractory SiC for waste incineration plants. Proceedings of UNITECR 2011, Kyoto, Japan, 1-E-4(2011).
[3]	Thorsten Tonnesen, Rainer Telle . Oxidation resistance of SiC based refractory linings in steam atmospheres—Material properties and testing methods. Proceedings of Colloquium on Refractories 2004, Aachen, Germany, 214-218.
[4]	Liu Jinqiu, Peng Lihua, Qin Shan . Effect of Si₃N₄ on crystallinity of fused silica crucibles during casting. Naihuo Cailiao (Refractories, in Chinese), 2016,50(4):248-251.

[1]	Valeriy V. MARTYNENKO, Iryna G. SHULYK, Yuliya Ye. MISHNYOVA, Tetyana G. TYSHYNA. Investigation of Microstructure and Phase Composition of Chromic Oxide, AZS/Cr and High-alumina Refractories after Exposure of Basalt and Aluminaboronsilicate Glasses Melts [J]. China's Refractories, 2024, 33(1): 1-6.
[2]	DU Juan, GUO Huishi, YANG Jialin, LI Wenfeng, GUI Yanghai, ZHAO Zhiqiang, LIU Yingfan. Effects of Al₂O₃-SiO₂ Raw Material Types on Properties of Anorthite Based Insulation Refractories [J]. China's Refractories, 2024, 33(1): 23-27.
[3]	JIN Zhishang, SHAN Zhilin, ZHAO Huizhong, YU Jun, ZHANG Han. Effect of Porogenic Agents on Properties of Microporous Mullite Aggregates [J]. China's Refractories, 2023, 32(3): 31-35.
[4]	CAO Huiyan, ZHANG Xinhua, HUANG Yifei, WANG Wenwu, WU Jiguang, BU Xiangjuan, XU Haiyang. Influence of Graphite on Molten-alkali Corrosion Resistance for β-SiAlON-SiC Materials [J]. China's Refractories, 2022, 31(4): 22-27.
[5]	CHENG Shuiming, CHEN Jinfeng, WEI Jianxiu, CAI Wei, ZHAO Huizhong. Effect of Submicron SiO₂ Powder Addition on Properties of Cement Free Iron Trough Castables [J]. China's Refractories, 2022, 31(3): 9-13.
[6]	YAN Mingwei, YANG Yumin, TONG Shanghao, ZHANG Jiayu, SUN Guangchao, LIU Kaiqi. Phase Reconstruction and Microstructure Evolution of Magnesia-carbon Refractories at High Temperatures in Nitrogen [J]. China's Refractories, 2022, 31(3): 14-23.
[7]	LYU Lihua, DING Donghai, XIAO Guoqing. Combustion Synthesis of C/MgAl₂O₄ Composite Powders and Their Microstructure Evolution [J]. China's Refractories, 2021, 30(4): 7-11.
[8]	LI Youqi, WANG Bingwei, ZHANG Yucui, BI Changlu, ZHAO Jizeng. Effect of Industrial Alumina Powder Particle Size on Preparation of Active α-Al₂O₃ Micropowder [J]. China's Refractories, 2021, 30(3): 11-16.
[9]	ZHANG Qi, YUAN Bo, WANG Gang, HAN Jianshen, ZHAO Xin. Effect of Nitriding Process on Phase and Microstructure of Silicon Nitride Fibers Prepared by Direct Nitriding Method [J]. China's Refractories, 2020, 29(4): 40-45.
[10]	GAO Zhenxin. Phase Relationship at Subsolidus Tem-perature of MgO-MgAl₂O₄-ZrO₂ Subsystem [J]. China's Refractories, 2020, 29(1): 1-6.
[11]	HUANG Zhigang*, WANG Jiaping, LI Jie, CAO Huiyan, WU Jiguang. Steam Oxidation Resistance of Nitride Bonded Silicon Carbide Refractories for Waste Incinerators at Elevated Temperatures [J]. , 2019, 28(3): 4-7.
[12]	YI Shuai, DENG Lina, ZENG Luju, XUE Fei, PAN Chuancai, LIN Guowei, LIU Yueqiang, ZHANG Hang, XIE Jinli. Effects of Chemical Composition and Microstructure on Exudation of Fused Cast AZS Refractory Materials [J]. , 2019, 28(2): 23-26.
[13]	Debasish CHANDRA. Comparison of Physico-mechanical Properties of TiO2 and Cr2O3 Additives on Reaction Sintered Zirconia-mullite Composites [J]. , 2019, 28(1): 11-21.
[14]	YE Hang, SUN Gaoyang, ZHANG Haibo, LI Yanjing, GAO Changhe, LI Yong, YE Fangbao. Investigation on Synthesis of Sintered Mullite from Low-medium Grade Kyanite [J]. , 2019, 28(1): 22-30.
[15]	Andreas BÖRGER, Johan LORICOURT, Angelika PRIESE. Influence of Impurities of Zircon Sand on the Microstructure of Fused Zirconia Grains for Continuous Casting of Steel Refractories [J]. , 2018, 27(1): 1-7.

China's Refractories

Research on Steam Oxidation Resistance of Si₃N₄-bonded SiC Refractories

RichHTML

PDF

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 11

References 4

Related Articles 15

Recommended Articles

Metrics

Comments