1. 1. 2. 3. 4. 5. 6. 7. 8. 9. © Differential Thermal Analysis Of Mullite Formation From Algerian Kaolin Sahnoune, F; Chegaar, M; Saheb, N; Goeuriot, P; Valdivieso, F MANEY PUBLISHING, ADVANCES IN APPLIED CERAMICS; pp: 9-13; Vol: 107 King Fahd University of Petroleum & Minerals http://www.kfupm.edu.sa Summary In the present work, the kinetics of mullite (3Al(2)O(3).2SiO(2)) formation from Algerian kaolin was investigated using differential thermal analysis ( DTA). The raw kaolin was wet ball milled for 5 h followed by attrition milling for 1 h. Differential thermal and thermogravimetric (DTA/TG) experiments were carried out on samples between room temperature and 1350 degrees C at heating rates of 5, 10, 20 and 40 degrees C min(-1). The temperature of mullite crystallisation was found to be similar to 1005 degrees C. The activation energies measured from isothermal and non- isothermal treatments were around 1290 and 1260 kJ mol(-1) respectively. The growth morphology parameters n (Avrami parameter which indicates the crystallisation mode) and m ( a numerical factor which depends on the dimensionality of crystal growth) were found to be almost equal to 1.5. Analysis of the results showed that bulk nucleation was dominant in mullite crystallisation followed by three-dimensional growth of mullite crystals with polyhedron-like morphology controlled by diffusion from a constant number of nuclei. References: AMUTHARANI D, 1999, MAT SCI ENG A-STRUCT, V264, P254 CAMPOS AL, 2002, J NON-CRYST SOLIDS, V304, P19 CASTELEIN O, 2001, CERAM INT, V27, P517 CHAKRABORTY AK, 1978, J AM CERAM SOC, V61, P170 CHANDRAN RG, 1996, J EUR CERAM SOC, V16, P843 CHAUDHURI SP, 1997, BRIT CERAM T, V96, P105 CHEN CY, 2000, CERAM INT, V26, P715 CHEN CY, 2000, J EUR CERAM SOC, V20, P2519 CHEN YF, 2004, J EUR CERAM SOC, V24, P2389, DOI Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa

2. 10. 11. 12. 13. 14. 15. © 10.1016/S0955-2219(03)00631-9 CHEN YF, 2004, MAT SCI ENG A-STRUCT, V373, P221 CHEN YF, 2004, SCRIPTA MATER, V51, P231, DOI 10.1016/j.scriptamat.2004.04.013 ELESKANDARANY MS, 2001, MECH ALLOYING FABRIC HERAIZ M, 2006, ADV APPL CERAM, V105, P285, DOI 10.1179/174367606X146676 16. HIRATA Y, 1990, CERAMIC T, V6, P323 17. LIGERO RA, 1991, J MATER SCI, V26, P211 18. LIU KC, 1994, J AM CERAM SOC, V77, P545 19. LU L, 1998, MECH ALLOYING 20. MATUSITA K, 1975, J MATER SCI, V10, P961 21. MATUSITA K, 1979, PHYS CHEM GLASSES-B, V20, P81 22. MATUSITA K, 1980, J NONCRYST SOLIDS, V38, P741 23. MATUSITA K, 1985, THERMOCHIM ACTA, V88, P283 24. NIKAIDO M, 1996, J CHEM ENG JPN, V29, P456 25. OKADA K, 1986, J AM CERAM SOC, V69, P251 26. PASK JA, 1991, J AM CERAM SOC, V74, P2367 27. REZAIE HR, 1997, BRIT CERAM T, V96, P181 28. ROMERO M, 2006, J EUR CERAM SOC, V26, P1647, DOI 29. 10.1016/j.jeurceramsoc.2005.03.235 30. SACKS MD, 1990, CERAMIC T, V6, P167 31. SAHNOUNE F, 2007, APPL CLAY SCI 32. SAINZ MA, 1997, J EUR CERAM SOC, V17, P1277 33. SAINZ MA, 2000, J EUR CERAM SOC, V20, P403 34. SCHNEIDER H, 1994, MULLITE MULLITE CERA 35. SCHNEIDER H, 2006, MULLITE 36. SOMIYA S, 1990, CERAM T, V6, P287 37. SORO N, 2003, J AM CERAM SOC, V86, P129 38. TRAORE K, 2003, CERAM INT, V29, P377, DOI 10.1016/S0272- 8842(02)00148-7 39. VIEIRA SC, 2007, CERAM INT, V33, P59, DOI 10.1016/j.ceramint.2005.07.015 40. VISWABASKARAN V, 2002, CERAM INT, V28, P557 41. VISWABASKARAN V, 2003, J MATER PROCESS TECH, V142, P275, DOI 42. 10.1016/S0924-0136(03)00577-6 43. VISWABASKARAN V, 2004, APPL CLAY SCI, V25, P29, DOI 44. 10.1016/j.clay.2003.08.001 45. WEI P, 1999, MAT SCI ENG A-STRUCT, V271, P298 For pre-prints please write to: nouari@kfupm.edu.sa Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa