Influence of graphite on molten-alkali resistance for β-SiAlON-SiC materials

doi:10.3969/j.issn.1001-1935.2021.06.003

Abstract

Abstract:

β-SiAlON-SiC composites were prepared using SiC particles and fines,silicon powder,AlN powder,α-Al₂O₃ micropowder and flake graphite as starting materials.The influence of the graphite (particle size of 45 and 300 μm,addition of 3.0%,5.5%,7.5%,and 10.0%,by mass) on the molten-alkali resistance was investigated.The results show that the molten-alkali resistance for the β-SiAlON-SiC sample with 7.5% of graphite (300 μm) is the optimal,showing the lowest mass change rate after corrosion,and the highest cold modulus of rupture and hot modulus of rupture retention ratio.

Key words: β-SiAlON-SiC, graphite, molten-alkali resistance, phase composition, microstructure

摘要：

以SiC颗粒及细粉、Si粉、AlN粉、α-Al₂O₃微粉、鳞片石墨等为原料制备了β-SiAlON-SiC材料。研究了石墨(粒度为45和300 μm,加入质量分数分别为3.0%、5.5%、7.5%、10.0%)对其抗熔碱侵蚀性的影响。结果表明:添加7.5%(w)粒度为300 μm的石墨的β-SiAlON-SiC试样抗熔碱侵蚀性能最佳,熔碱侵蚀后质量变化率最低,常温抗折强度保持率和高温抗折强度保持率最高。

关键词: β-SiAlON-SiC材料, 石墨, 抗熔碱侵蚀性, 物相组成, 显微结构

CLC Number:

TQ175

Cao Huiyan, Zhang Xinhua, Huang Yifei, Wang Wenwu, Wu Jiguang, Xu Haiyang. Influence of graphite on molten-alkali resistance for β-SiAlON-SiC materials[J]. Refractories, 2021, 55(6): 471-475.

曹会彦, 张新华, 黄一飞, 王文武, 吴吉光, 许海洋. 石墨对β-SiAlON-SiC材料抗熔碱侵蚀性能的影响[J]. 耐火材料, 2021, 55(6): 471-475.

Figures/Tables 8

Table 1 Formulations of specimens

原料		w/%
原料		0#	X1	X2	X3	X4	C1	C2	C3	C4
	3~0.5 mm	55	55	55	55	55	55	55	55	55
SiC	≤0.5 mm	15	15	15	15	15	15	15	15	15
	≤0.044 mm	10	7.0	4.5	2.5	0	7.0	4.5	2.5	0
鳞片石墨	45 μm	0	3.0	5.5	7.5	10	0	0	0	0
鳞片石墨	300 μm	0	0	0	0	0	3.0	5.5	7.5	10.0
Si粉+AlN粉+α-Al₂O₃粉		20	20	20	20	20	20	20	20	20

Fig.1 Mass change rate vs graphite addition after molten alkali resistance

Fig.2 CMOR and HMOR retention ratios vs graphite addition after molten alkali resistance

Fig.3 XRD patterns for the surface of sample 0#,X3 and C3 after molten alkali resistance

Fig.4 Cross section structure of sample 0# after molten alkali resistance

Fig.5 Cross section structure of sample X3 after molten alkali resistance

Fig.6 Cross section structure of sample C3 after molten alkali resistance

Fig.7 Amount of K element at different distances from surface after molten alkali resistance

References 8

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