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Preparation for Ceramic Alumina Foam and Study on Properties

Author: LiLiXin
Tutor: SangKeZheng
School: Chang'an University
Course: Materials Science
Keywords: Ceramic foam filter Organic foam impregnation process Stability Linked to pulp properties Pretreatment Bending strength Thermal shock resistance
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 482
Quote: 2
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Abstract


The main application of the ceramic foam as molten metal filters , but the filters currently on the market widespread low bending strength , thermal shock resistance and poor shortcomings . Therefore , research and high-performance ceramic foam has engineering significance and value . In this study, as the main raw material, alumina ceramic foam were successfully prepared using organic foam impregnation process . The text detailed study of the influence of the dispersing agent added in an amount of ammonium polyacrylate to the alumina slurry stability ; added in an amount of carboxymethyl cellulose in the solids content of the slurry and the slurry rheological agent linked to pulp properties of the polyurethane foam ; foam pretreatment their performance linked to pulp . Adding a certain amount of zirconium dioxide powder and titanium carbide particles , the use of phase transformation toughening mechanism of microcrack toughening mechanism and particle toughening mechanism toughening mechanism in alumina slurry to increase the alumina -based foam the high temperature properties of the ceramic filter . Experiment by means of XRD, SEM and other means to do the analysis of the microstructure of the ceramic foam and high temperature performance . The results show that : the slurry was added a mass fraction of 2 % ammonium polyacrylate and the pH of the slurry is from 9:00 to obtain good stability of the ceramic slurry; solid content of 70% of the slurry and the slurry was added 0.3% carboxymethyl cellulose when the rheology of the slurry is preferably ; the polyurethane foam in a concentration of 15% lye , immersed in a temperature of 50 ° C for 6 hours, the foam linked to pulp the best performance . Study also showed that the : alumina ceramic slurry was added to the zirconia powder and the titanium carbide particles , the ceramic foam filter of the flexural strength and thermal shock stability improved, added to the slurry of 15% zirconium dioxide and 5 % titanium carbide particles obtained ceramic foam filter , flexural strength of the largest and most cycles of thermal shock , flexural strength of 2.61MPa .

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
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