No description available.

No description available.

Thesis (M.S.)--University of Wisconsin--Madison, 1965. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 59.

Thesis (Ph. D.)--University of Texas at Austin, 2007. / Vita. Includes bibliographical references.

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Made available in DSpace on 2014-12-17T14:57:59Z (GMT). No. of bitstreams: 1 AldemiroJRP_DISSERT.pdf: 1779400 bytes, checksum: 8a5467983a7427bc6b96f7baa7868609 (MD5) Previous issue date: 2010-01-21 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This work presents research into the addition of chamotte obtained from the ceramic isolator of unusable spark plugs in formulations of material mixes for standard white ceramic material with aluminum oxide bases. After the physical chemical characterization of the primary materials, standard clay and the chamotte, three mixtures were prepared with concentrations of 10, 20 and 30% chamotte by weight in relation to the standard clay. The test samples underwent heating at a rate of 30 0C/min to levels that included 100o , 200o , 300o, 400o, 500o e 600 0C and also we submitted to three distinct burn temperatures: 1450o, 1500o e 1550 0C, remaining at these temperatures for 2 hour periods. After sintering, the physical and microstructural properties of the different test samples were measured and analyzed. The results show that the materials obtained present good technical properties and that the chamotte can be reutilized as an additive in the production of white ceramic material with an aluminum oxide base / Neste trabalho estudou-se a influ?ncia da adi??o de chamote obtido do isolador cer?mico de velas de igni??o inserv?veis na formula??o de massas de cer?mica branca a base de alumina. Ap?s caracteriza??o f?sico-qu?mica das mat?rias-primas, argila-padr?o e chamote, foram preparadas tr?s formula??es de concentra??es 10, 20 e 30% em peso de chamote em rela??o ? argila-padr?o. Os corpos-de-prova foram submetidos ao aquecimento numa taxa de 30 0C/min em patamares de 100? , 200? , 300? , 400? , 500? e 600 0C e queimados em tr?s temperaturas distintas a 1450? , 1500? e 1550 0C, permanecendo 2 horas na temperatura de patamar. Ap?s as sinteriza??es, as propriedades f?sicas e a evolu??o microestrutural de fases dos corpos-de-prova foram mensuradas e discutidas. Os resultados mostraram que os materiais obtidos apresentam boas propriedades e que o chamote pode ser reaproveitado como aditivo na produ??o de cer?micas brancas a base de alumina