Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-05-10T21:07:59Z No. of bitstreams: 1 LucianoLeonardoLopesCosta_DISSERT.pdf: 2685807 bytes, checksum: cd44bd3b6242d63070197e5e8c9d88a2 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-05-12T23:35:09Z (GMT) No. of bitstreams: 1 LucianoLeonardoLopesCosta_DISSERT.pdf: 2685807 bytes, checksum: cd44bd3b6242d63070197e5e8c9d88a2 (MD5) / Made available in DSpace on 2016-05-12T23:35:09Z (GMT). No. of bitstreams: 1 LucianoLeonardoLopesCosta_DISSERT.pdf: 2685807 bytes, checksum: cd44bd3b6242d63070197e5e8c9d88a2 (MD5) Previous issue date: 2015-08-12 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Tendo em vista a crescente busca por materiais que possam cada vez mais melhorar a efici?ncia de isolantes t?rmicos e que n?o causem agress?o ao meio ambiente, temos a utiliza??o da palha da carna?ba como uma alternativa de refor?o em comp?sitos de isola??o t?rmica. O comp?sito ? formado por fibras naturais da folha da carna?ba que possui propriedades f?sico-qu?micas desej?veis para ser utilizado como isolante t?rmico e o min?rio Caulim, que se caracteriza por ser quimicamente inerte e possuir baixa condutividade t?rmica. O comp?sito citado foi submetido a ensaios para determinar a sua condutividade t?rmica, densidade e resist?ncia ? temperatura. As propriedades f?sicas, estruturais e morfol?gicas das mat?rias-primas foram investigadas atrav?s de an?lises de termogravimetria, difra??o de raios X, fluoresc?ncia de raios X e microscopia eletr?nica de varredura. / Thinking about the growing search for materials than can improve the efficiency of thermal insulations, and that do not cause aggressions to the environment, we decided to use the leaf of the carnauba as an alternative reinforcement in composites of thermal insulation. The composite is formed by natural fibers of leaves of the carnauba, that possesses good physicochemical properties to work as a thermal insulation and the minerium caulim, that is characterized for being chemical inert and possesses low thermal conductivity. The carna?ba straw acquired was-covered with impurities, it was subjected to various washing processes for these impurities do not interfere in the tests, the caulimwas used without any treatment for their processing. After cleaning, the straw was milled in a knife mill to be in the form of powder, this powder was mixed with kaolin to be more homogeneous, the mixture was properly hydrated and pressed to make specimenfor testing.The composite was divided into formulations of 10%, 30% and 50%, this value indicates the percentage of the fiber mass of the carnauba powderper total mass of the composite, after that, the specimens were manufactured by the pressing method. The specimens have been tested to determine conductivity, resistance, diffusivity. Analyses of thermogravimetry, x-ray diffraction, x-ray fluorescence were done, and a compression test to determine whether it could be used in wall cladding. The composite showed satisfactory results in their thermal characteristics, the composite showed satisfactory results in their thermal characteristics , with an operating range of up to 150 ? C and an average thermal conductivity of 0.199 W /m.K and quite feasible in the item cost-effective, but somewhat limited by their place of application.