Characterization of High Alumina Refractory Ceramics Treated with Combined Two Laser Surface Processing

2001 ◽  
Vol 697 ◽  
Author(s):  
Johanna R. Bernstein ◽  
Dimitris Triantafyllidis ◽  
Lin Li ◽  
F. Howard Stott
Keyword(s):  
Laser Energy ◽  
Erosive Wear ◽  
Industrial Applications ◽  
Chemical Degradation ◽  
High Alumina ◽  
Energy Sources ◽  
Large Temperature ◽  
Ongoing Work ◽  
Wear Damage ◽  
Alumina Refractory

AbstractAlumina-based refractory materials are extensively used in high-temperature industrial applications, such as for linings in waste and other incinerators. The existence of porosity and material inhomogeneities can promote chemical degradation due to molten slag penetration, while impacting solid or liquid feedstock can cause erosive-wear damage. Previous research has successfully used single laser energy sources to alter the surface properties of similar ceramics, with emphasis on sealing porosity and enhancing degradation resistance. However, this process has resulted in some solidification cracking at the surface due to large temperature gradients developed during processing. In the present, ongoing work, the surface of the refractory ceramic is modified by combining two laser energy sources to control the thermal gradients and cooling rates, with the objective of eliminating crack formation. The surface morphology and microstructures of the laser-treated areas are analyzed. This paper presents some initial results from the programme.

scholarly journals High alumina refractory concretes bonded with calcium aluminate phosphate binder

2020 ◽  
Vol 120 ◽  
pp. 91-97
Author(s):  
A. O. Nagorniy
Keyword(s):  
Calcium Aluminate ◽  
Strength Properties ◽  
Structure Design ◽  
High Alumina ◽  
Phosphate Binders ◽  
Construction Costs ◽  
Interphase Interaction ◽  
Initial Strength ◽  
Heating And Cooling ◽  
Alumina Refractory

For many industries, further progress is possible provided that more efficient refractories of new types are created. The refractory concretes bonded by calcium aluminate phosphate binders in comparison with conventional refractories continue to gain in popularity because of the following advantages: quick installation and low construction costs; reduced and simplified furnace maintenance; good thermal-shock resistance; monolithic (no joints); linings of the units done need not be cured to develop initial strength. The longevity of refractory is essentially increasing provided structure is forming under conditions of the service site. That is why developing of new refractory materials must be carried out by means of its structure design. These principles have been realizing in the refractory concretes technology under the limited conditions of refractory lining installation and industrial unit final heat up. The present paper identifies the phosphate phases responsible for developing mechanical-strength properties of high alumina concretes bonded with calcium aluminate phosphate binders. It sets out the colloid and crystalline phases resulted from interphase interaction that provides the basis for calcium aluminate phosphate binders (suspensions) useful to the refractory industry. The concretes obtained retain their volume integrity after 30 cycles of heating and cooling; can be used for refractory applications > 1700 °С; exhibit sufficient strength of lining 40 MPa.

scholarly journals Binder effect on ZnAl2O4-containing high-alumina refractory castables

2022 ◽  
Author(s):  
V.S. Pinto ◽  
A.P. Luz ◽  
O.H. Borges ◽  
V.C. Pandolfelli
Keyword(s):  
High Alumina ◽  
Refractory Castables ◽  
Alumina Refractory

scholarly journals Study of aluminium oxide from high-alumina refractory ceramics by thermoluminescence

2008 ◽  
Vol 31 (6) ◽  
pp. 891-895 ◽  
Author(s):  
V. Correcher ◽  
J. Garcia-Guinea ◽  
R. Gonzalez-Martin ◽  
E. Crespo-Feo ◽  
D. Jimenez-Cordero
Keyword(s):  
Aluminium Oxide ◽  
High Alumina ◽  
Alumina Refractory ◽  
Refractory Ceramics
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