Effect of mullite formation on properties of refractory castables
Source abstract
Abstract
In order to study the effect of the mullite bond phase on the physico-mechanical and refractory properties of the refractory castables, four castable samples were prepared; castable 1 contained 15 wt.% calcium aluminate cement (80% alumina) and 85 wt.% well graded tabular alumina . The other three samples (2, 3, 4) contained 10, 5 and 2% cement and 5, 10 and 13% of an alimina/ silica mixture (in the ratio 2.33:1, the molecular ratio of mullite). Their composition was investigated after firing at different firing temperatures using X-ray diffractin analysis. The physico-mechanical and refractory properties of such castables were determined according to standard specifications. Castable 4 that contained only 2 wt.% cement with 13 wt.% alumina/silica mixture and 85 wt.% well graded tabular alumina aggregate exhibited outstanding physico-mechanical and refractory properties after firing at 1500°C due to the presence of mullite in the bond phase with very little CaO. This enables their use in various refractory applications such as in steel, aluminium, copper, glass, cement, chemical and ceramic production.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Recycling and utilization of industrial and municipal waste in materials production · Concrete and Cement Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (27)
Show source-provided references
1. A new generation of low-cement
2. L. Prost, A. Panillac, Hydraulically Setting Refractory Compositions, Fr. Pat. No. 6934405, 1969.
3. Strength development of bauxite-based ultralow-cement castables
4. U. Schuhmacher, Untersuchungen an Zementarmen und Ultrazementarmen Korundfeuerbetones, PhD thesis, Rheinisch-Westfalischen Technischen Hochschule, Aachen, FRG, 1988.
5. A. Mathieu, A. Campas, J. Bayoux, D. Richon, Calcium aluminate cement and reactive alumina, UNITECR'93 Congress, Sao Paulo, Brazil, pp. 672–682.
6. B. Myhre, Hot strength and bond-phase reactions in low and ultralow-cement castables, UNITECR'93 Congress, Sao Paulo, Brazil, pp. 583–594.
7. L. Zaigeng, Z. Luning, Y. Guotian, Z. Ninsheng, The effect of some ultrafine oxides on the properties of ultralow-cement corundum based castables, 35th International Colloquium on Refractories, Aachen, 1992.
8. Calcium aluminate cements for emerging castable technology
9. A. Hundere, B. Myhre, On the influence of superfines in high alumina castables, 39th International Colloquium on Refractories, Aachen, 1996.
10. A. Hundere, B. Myhre, Effect of different finest fractions (SiO2 and/or Al2O3) in alumina based ultralow-cement castables, Am.Ceram. Soc., 98th Annual Meeting Indianopolis, 14–17 April 1996.
11. B. Sandberg, B. Myhre, J. L. Holm, Castables in the system MgO–Al2O3–SiO2 , UNITECR'95 in Kyoto, Japan, November 19-232, 1995.
12. B. Myhre, Microsilica in alumina based ultralow-cement castables; the effect of microsilica addition on flow, 23th ALAFAR Congress in Puerto Vallara, Mexico, 6–10 November 1994.
13. B. Myhre, Ultralow-cement castables; casting and set properties of secar cements with additives, 20th ALAFAR Congress, Chile, 1990.
14. B. Myhre. Cement-free castables in the system MgO–SiO2, The effect of bond phase modifier on strength, Am. Ceram. Soc., 93rd Annual Meeting in Cincinnati, Ohio, 15 May 1991.
15. T. Richter, T. Vezza, Advantages and disadvantages of cement free castables, 39th International Colloquium on Refractories, Aachen, 1996, pp. 98–100.
16. New refractory concretes and binding systems10.1007/BF02767985 ↗
17. Use of low-cement and ultralow-cement refractory castables in the iron and steel industry furnace prospects
18. R.E. Fisher, Testing the installation properties of monolithics; standardization and development of testing of steel plant refractories, in: Proceedings of the 28th Annual Symposium on Refractories, Am. Ceram. Soc., Westerville, OH, 1992.
19. DIN 51 065 Bestimmung der Rohdichte, 1989.
20. DIN 51 056 Bestimmung der Offnen Porositat, 1989.
21. DIN 51 067 Bestimmung der Druckfestigkeit,1989.
22. DIN 51 053 Bestimmung der Druckfiessen bei Konstanter Temperature and Konstantem Druck, 1989.
23. Advanced techniques for measuring rheology of cement-based refractories
24. Vibrated castables with a thixotropic behaviour
25. R.J. Macliver, H. Kathryn, The effect of reactive alumina on reduced cement castable properties, 37th Colloquim on Refractories, Aachen, 1994.
26. Einlargerungsversuche in mullite
27. U. Schumacher, Untersuchungen an Zementarmen und Ultrazementarmen Korundfeuerbetones, PhD thesis, Rheinischwestfalischen Technischen Hochschule, Aachen, FGR, 1988.