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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estudo da formula??o de massas cer?micas provenientes da regi?o do Serid?-RN para fabrica??o de telhas

Andrade, Felipe Lira Formiga 06 March 2009 (has links)
Made available in DSpace on 2014-12-17T14:57:50Z (GMT). No. of bitstreams: 1 FelipeLFA.pdf: 4959653 bytes, checksum: 0da7f126d56ee6a849bfaf9a5d53da1d (MD5) Previous issue date: 2009-03-06 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / This work has for objective study compared the characteristics and technological properties of ceramic bodies from the region of Serid?-RN. The region under study has identified 23 cities where they were 80 ceramics industries. To define the universe of search, there was a survey of pottery that are part of APL Serid? next to the IEL. The characteristics and operating conditions of ceramics industries of the region were identified through a socio-economic questionnaire applied locally, which addressed issues such as: profiles of companies, production process etc. The analysis of information collected from 24 companies identified in seven cities shows that the vast majority of industries is small, with family structure, obsolete equipment and labo, little qualified. Most of the pottery works with low technical knowledge, poor control of the production process and product technology. The raw collected were submitted to analysis of X ray diffraction, chemical composition, termical analysis, particle size distribution and plasticity. Then were produced five formulations and made by uniaxial pressure at 25 MPa for firing in temperatures varying from 850 to 1050 ?C. The firing technological properties evaluated were: mass loss to fire, lineal shrinkage, apparent density, apparent porosity, water absorption and flexural strength (3 points). The results indicated that the raw materials from the region have significant similarities in the composition chemical and mineralogical. Furthermore, it indicates the possibility of the use of cycles of firing faster and efficient than the current, limited to some clay mass burning of certain conditions / Este trabalho teve como objetivo estudar comparativamente as caracter?sticas e propriedades tecnol?gicas de massas cer?micas para telhas da regi?o do Serid?-RN. A Regi?o em estudo possui 23 munic?pios onde foram identificadas 80 ind?strias cer?micas. Para defini??o do universo da pesquisa, fez-se um levantamento das olarias que fazem parte da APL Serid? junto ao IEL do Estado. As caracter?sticas e condi??es de funcionamento das ind?strias cer?micas da regi?o foram identificadas atrav?s de um question?rio s?cio-econ?mico aplicado in loco, que abordava aspectos como: perfil das empresas, processo produtivo etc. A an?lise das informa??es coletadas em 23 empresas identificadas em sete munic?pios permite concluir que a grande maioria das ind?strias ? de pequeno porte, com estrutura familiar, equipamentos obsoletos e m?o-de-obra pouco qualificada. Grande parte das olarias opera com baixo conhecimento t?cnico, prec?rios controles do processo produtivo e tecnol?gico dos produtos. As mat?rias-primas coletadas foram submetidas a ensaios de difra??o de raios X, composi??o qu?mica, an?lise t?rmica, distribui??o de tamanho de part?culas e plasticidade. Em seguida foram produzidas cinco formula??es e confeccionados corpos-de-prova por prensagem uniaxial a 25 MPa para queima variando de 850 ?C a 1050?C. As propriedades tecnol?gicas de queima avaliadas foram: perda de massa ao fogo, retra??o linear, massa espec?fica aparente, porosidade aparente, absor??o de ?gua e carga de ruptura ? flex?o (3 pontos). Os resultados indicaram que as mat?rias-primas provenientes da regi?o apresentam significativas semelhan?as quanto ? composi??o qu?mica e mineral?gica. Al?m disso, indica-se a possibilidade da utiliza??o de ciclos de queima mais r?pidos e eficientes que os atuais, limitando algumas massas argilosas para certas condi??es de queima

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