Effects of a Combined Silica-containing Additive on Structural and Rheological Properties of a Low-cement Silicon Carbide Castable

doi:10.19691/j.cnki.1004-4493.2022.02.001

China's Refractories ›› 2022, Vol. 31 ›› Issue (2): 1-6.DOI: 10.19691/j.cnki.1004-4493.2022.02.001

Effects of a Combined Silica-containing Additive on Structural and Rheological Properties of a Low-cement Silicon Carbide Castable

Valeriy V. MARTYNENKO^*(), Vladimir V. PRIMACHENKO, Pavlo O. KUSHCHENKO, Irina G. SHULIK, Ludmyla K. SAVINA

The Ukrainian Research Institute of Refractories named after A.S. Berezhnoy, Kharkiv 61024, Ukraine

Online:2022-06-15 Published:2022-07-05
Contact: Valeriy V. MARTYNENKO
About author:Dr. Valeriy Martynenko is a director of the Ukrainian Research Institute of Refractories, named after very famous scientist in refractory field, academician A. S. Berezhnoy. He has been working in the institute for more than 40 years, carrying out researches in the field of silica, alumina, zirconia and chromia refractories, and their industrial applications. He has published over 370 scientific works and 80 patents. He is a member of the American Ceramic Society, as well as a member of the editorial board of the magazines “refractories WORLDFORUM” (Germany) and“China’s Refractories” (China). He is also the editor-in-chief of the collection “Scientific Research on Refractories and Technical Ceramics, Collection of Scientific Papers”, which is published by the institute.

Abstract

Abstract:

The use of a combined additive consisting of silica-containing additives “F” (thinning) and “S” (accelerating castable hardening) instead of the previously used silica-containing additive “A” and a mixture of dispersing additives based on polyethylene glycol in low-cement silicon carbide castable allows to improve the castable workability by increasing (in 5.4 times) the flowability of a freshly prepared castable, and increase by 1.2 and 1.1 times the cold crushing strength of heat-treated at temperatures of 110 and 1 580 °C, respectively, castable samples from low-cement silicon carbide castable with practically equal values of open porosity (15.8% and 16.0%). The petrographic studies of the castable sample microstructure after firing at a temperature of 1 580 °C showed that the investigated silica-containing additives “F” and “S” contribute to the denser and more uniform structure formation. As a result of the carried out research, the manufacturing technology of a low-cement silicon carbide castable was improved, of which the production was mastered at JSC “URIR named after A. S. Berezhnoy”.

Key words: low-cement silicon carbide castable, additives, flowability, structure strength

Valeriy V. MARTYNENKO, Vladimir V. PRIMACHENKO, Pavlo O. KUSHCHENKO, Irina G. SHULIK, Ludmyla K. SAVINA. Effects of a Combined Silica-containing Additive on Structural and Rheological Properties of a Low-cement Silicon Carbide Castable[J]. China's Refractories, 2022, 31(2): 1-6.

Figures/Tables 8

References 8

[1]	Semler Ch. E. Key issues for today’s refractories industry. Proceedings of the World Refractory Congress, Singapore, 2004: 1-10.
[2]	Silivanova A. N. Development of refractory concrete. New Refractories, 2009, 12: 52-54.
[3]	L. M. Aksel’rod. Development of refractory production in the world and in Russia, new technologies. Refractories and Industrial Ceramics, 2011, 52(2): 95-106. DOI URL
[4]	Tropinov A. M., Tropinova I. V. Experience of using thermal shock-resistant heat-resistant concrete in the furnaces of biofuel boilers. New Refractories, 2011, 11: 24-28.
[5]	Primachenko V. V., Babkina L. A., Savina L. K., Shcherbak L. M., Tinigin A. S., Tishina T. G. Sci. Proc. Investigation of the material composition effect on the properties of low-cement silicon carbide castable and samples from it. Coll. Sci. Proc. of PJSC “The URIR named after A. S. Berezhnoy”, Kharkiv, 2016, 116: 43-53.
[6]	ISO 1927-4: 2012 (E). Monolithic (unshaped) refractory products— Part 4: Determination of consistency of castables. Geneva, 2012: 8.
[7]	Rebinder P. A. Processes of structure formation in dispersed systems. Moscow: Stroyizdat Press, 1966: 212.
[8]	Primachenko V. V. Investigation of the formation processes of coagulation structures in vibrocasting coarse-grained thixotropic masses. Refractories, 1994, 5: 2-5.

Materials	LOI	Si	Al₂O₃	SiO₂	Fe₂O₃/magnetic particles	СаО/ МgO	SiC/С_free	Na₂O/K₂О
Silicon carbide	—	0.40	0.04	0.43	0.20/0.03	—	98.40/0.20	—
Alumina of the α-form	0.02	—	99.75	0.02	0.01	0.01/No	—	Na₂O+K₂О 0.19
Quartz-containing additive “A”	0.13	—	0.42	99.36	0.04	0.04	—	—
High-alumina cement	—	—	73.80	1.20	0.33/No	20.90/No	—	—
Silica-containing additive “F”	10.30	—	18.80	66.50	0.10/No	0.50/No	—	3.50/0.23
Silica-containing additive “S”	4.80	—	24.40	68.30	0.08/No	1.27/No	—	0.75/0.22

Materials	LOI	Si	Al₂O₃	SiO₂	Fe₂O₃/magnetic particles	СаО/ МgO	SiC/С_free	Na₂O/K₂О
Silicon carbide	—	0.40	0.04	0.43	0.20/0.03	—	98.40/0.20	—
Alumina of the α-form	0.02	—	99.75	0.02	0.01	0.01/No	—	Na₂O+K₂О 0.19
Quartz-containing additive “A”	0.13	—	0.42	99.36	0.04	0.04	—	—
High-alumina cement	—	—	73.80	1.20	0.33/No	20.90/No	—	—
Silica-containing additive “F”	10.30	—	18.80	66.50	0.10/No	0.50/No	—	3.50/0.23
Silica-containing additive “S”	4.80	—	24.40	68.30	0.08/No	1.27/No	—	0.75/0.22

Materials	Particle size
Vibro-milled silicon carbide	The maximum particle size is 100 μm, the prevailing one is 8-40 μm.
Quartz-containing additive “A”	Angular particles of irregular shape, isometric and somewhat elongated. The maximum particle size is 130 μm, the prevailing one is < 4-30 μm.
Vibro-milled alumina of the α-form	The maximum particle size is 30 μm, the prevailing one is < 4-8 μm (particles ≤ 10 μm—not less than 90 %).
High-alumina cement	High-alumina cement aggregates are fine-crystalline (on average < 4-8 µm, single crystals—up to 20 µm). The maximum particle size is 100 μm, the prevailing one is < 4-30 μm.

Materials	Particle size
Vibro-milled silicon carbide	The maximum particle size is 100 μm, the prevailing one is 8-40 μm.
Quartz-containing additive “A”	Angular particles of irregular shape, isometric and somewhat elongated. The maximum particle size is 130 μm, the prevailing one is < 4-30 μm.
Vibro-milled alumina of the α-form	The maximum particle size is 30 μm, the prevailing one is < 4-8 μm (particles ≤ 10 μm—not less than 90 %).
High-alumina cement	High-alumina cement aggregates are fine-crystalline (on average < 4-8 µm, single crystals—up to 20 µm). The maximum particle size is 100 μm, the prevailing one is < 4-30 μm.

Components	Content of components in compositions /mass%
Components	1(Base)	2	3	4	5
Alumina of the α-form	8	8.5	8	7.5	7
Quartz-containing additive “A”	2	-	-	-	-
Mixture of dispersing additives (MDA) (above 100 %)	0.2	-	-	-	-
Silica-containing additive “F”	-	1	1	1	1
Silica-containing additive “S”	-	0.5	1	1.5	2

China's Refractories

Effects of a Combined Silica-containing Additive on Structural and Rheological Properties of a Low-cement Silicon Carbide Castable

RichHTML

PDF

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 8

References 8

Related Articles 10

Recommended Articles

Metrics

Comments

Properties	Compositions
Properties	1	2	3	4	5
Cold crushing strength after 7 days of hardening and drying at a temperature of 110 °C (2 h) /(N · mm^-2)	34.0	39.5	41.4	44.8	50.9
Cold crushing strength after firing at 1 580 °C /(N · mm^-2)	145	152	160	120	111
Apparent density /(g · cm^-3)	2.740	2.720	2.720	2.715	2.705
Open porosity /%	16.0	16.0	15.8	16.5	17.0
Change in linear dimensions /%	-0.28	-0.32	-0.29	-0.42	-0.44

[1]	Debasish CHANDRA. Comparison of Physico-mechanical Properties of TiO2 and Cr2O3 Additives on Reaction Sintered Zirconia-mullite Composites [J]. , 2019, 28(1): 11-21.
[2]	Valeriy V. MARTYNENKO*, Vladimir V. PRIMACHENKO, Irina G. SHULIK, Dmitriy A. SHISHKOVSKIY, Eleonora L. KARYAKINA, Vladimir V. VARGANOV. Advanced Ramming Mix Based on Fused Zirconia Stabilized by Combined Additives of CaO and MgO for Lining of Carbon Black Production Reactor [J]. , 2017, 26(3): 1-7.
[3]	GUO Weiming*,WU Lixiang,LIN Huatay, ZHANG Guojun. Review on Enhancement of Nitridation of Si Powder [J]. , 2015, 24(3): 18-21.
[4]	Christos G ANEZIRIS, V ROUNGOS, Steffen DUDCZIG, M EMMEL. Refractories with Improved Thermal Shock Performance Serving Low Carbon Economy [J]. , 2013, 22(3): 7-11.
[5]	SHI Huiying, ZHANG Yang, BU Xiangjuan. Effect of Treated Graphite on Properties of Al2O3-SiC-C Castables [J]. China's Refractories, 2009, 18(2): -.
[6]	PENG Xiaoyan, LI Lin, HE Zhiyong. Effect of Metal Additives on the Performance of Low-Carbon Magnesia-Carbon Materials [J]. China's Refractories, 2007, 16(1): -.
[7]	ZHOU Ningsheng, LIU Min, ZHANG Sanhua. Thermal Behavior in Relation to Different Bindings of Alumina Based Castables from 20 to 1000℃ [J]. China's Refractories, 2006, 15(4): -.
[8]	BU Jinglong,YU Zhidong,WANG Ruisheng. Effect of Sintering Additive on the Properties of Sialon-SiC by Gelcasting [J]. China's Refractories, 2004, 13(4): -.
[9]	ZHANG Yong, PENG Dayan,WEN Hongjie. Influence of Synthesized Super Al2O3 Powder on the Properties of Alumina Castable [J]. China's Refractories, 2003, 12(3): -.
[10]	ZHANG Minghua, FENG Yunkang. Hot Flowability and Hardening Time of Hot Self-flowing Repair Mixes [J]. China's Refractories, 2000, 9(1): -.