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Metal Casting Technologies : September 2006
with the formation of poly- and meta -phosphate compounds during the condensation process which leads to flexible ring- and chain structure with a stability up to 800°C (1500 ºF). Due to this and the properties explained under 4.2.1 mono-phosphate bonded materials do not require dry-out and therefore it is possible to manufacture burner tiles "just in time" with an installation right after setting. Although this FEM analysis is only focused on the heat up process of the tile it shows the material behavior at a very critical state of the temperature cycle. This is confirmed by calculations of the thermal stress resistance parameters R1-R3 which show different results of the two test materials in this temperature range. Both FEM analysis and the calculation of stress parameter are practicable tools for materials ranking. A ranking based on stress parameter calculations however depends on a comprehensive data base. Traditional material testing procedures have shown to be inaccurate predictors of the performance of phosphate bonded materials in this application. One has to consider that tests under load conditions show results which are probably influenced by temporary melt phases with lower viscosity and plastic flow. Therefore it is recommended to compare results achieved by using varied and extended holding times.● WHO'S WHO OF METALS -- ANNUAL 2006/7 83 de Belder Associates Ltd 9 Rimsdale Close, Gatley, Cheshire, England. SK8 4LL Tel: +44 (0) 161 428 8568 Email: email@example.com www.debelderassociates.com INTERNATIONAL RECRUITMENT SOLUTIONS FOR THE FOUNDRY AND METALS INDUSTRY Agents and Associates Worldwide. Employment Opportunities in Europe, China, Middle East, India and Russia. We specialise in the recruitment of all levels of personnel for the Foundry, Casting and Metals industries including Technical, Production, Operations, Engineering, Sales, General Management and Executive appointments. Visit our website for details of our present appointments or simply contact us by email. Do you need to recruit experienced foundry personnel? With many years experience of specialised recruiting, we offer a confidential service to all our clients and candidates. FOUNDRY APPOINTMENTS REFERENCES 1.) Baukal C.E.,"The John Zink Combustion Handbook," pp 303. 2001 2.) Schacht C.A.,"Thermomechanical Behavior of Refractories" in: "Key Engineering Materials", Vol.88. 1993 pp 204-206 3.) Hasselmann D.P.H., "Thermal Stress Resistance parameters for brittle refractory ceramics," Bulletin of the Amer. Ceram. Soc. 49. 1970. pp 1033 - 1037 4.) Parr C., Bier T.A., Bunt N.C., Spreafico E.E.,"Calcium Aluminate Cement based castables for demanding applications," Lafarge Technical Paper 5.) Parr C., Bier T.A., Mathieu A., Spreafico E.E, "Calcium aluminate cements for monolithic refractories," Proceedings of the 1 Monolithic Conference, Teheran, Iran; 1997 6.) Petzold, Ulbricht,"Feuerbeton und betonartige feuerfeste Massen und Materialien,". Deutscher Verlag fuer Grundstoffindustrie, Leipzig. pp40- 41 7.) Schulle W. "Feuerfeste Werkstoffe," Deutscher Verlag fuer Grundstoffindustrie, Leipzig. pp352 -- 357 8.) Plibrico Japan,"Technology of Monolithic Refractories,". 1999. pp148 -- 164 9.) Krebs R."Unshaped Refractory Materials," 1997. pp193 in: Routschka G. "Refractory Materials." 1997. pp 193 10.) Plibrico Japan,"Technology of Monolithic Refractories." 1999. pp225 - 225 11.) Schacht. Charles A.,"Refractory Linings". New York 1995. pp 157 - 192 12.) F.J Gonzales, J.W Halloran "Reaction of Orthophosphoric- Acid with Several Forms of Aluminum Oxide," Amer. Ceram. Bulletin Vol. 59 No.7, 1980. pp 727 13.)Bartha P., Lehmann H., Koltermann M.,"Untersuchungen zur Bindung keramischer Werkstoffe mit H3PO4", Ber. Dt. Keram. Ges. 48 (1971) H3. pp111 14.) Bothe J.V., Brown P.W.,"Reactivity of Aluminatowards Phosphoric Acid", J. Am Ceram Soc. 76 (9) pp 2353-58 (1993) 15.) Plibrico Japan,"Technology of Monolithic Refractories," 1999. pp 237 16.) Appelt R., "Aluminiumoxid und seine Bindung mit Monoaluminiumphosphat," Sprechsaal, Vol.116, No.9, 1983 17.) Plibrico Japan,"Technology of Monolithic Refractories," 1999. pp 175