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Previous issue date: 2015-02-24 / A ind?stria de isoladores el?tricos cer?micos utiliza mat?rias primas nobres como
argilas de queima branca silicosas e ou aluminosas, com a finalidade de oferecer plasticidade
a massa e contribuir nas propriedades el?tricas e mec?nicas requeridas ao produto, e o
feldspato com a fun??o de fundente. Na composi??o das massas a literatura indica que a argila
participa com percentuais entre 20 e 32, e o feldspato de 8 a 35, sendo materiais de custos
significativos. Nesta pesquisa foi realizada a substitui??o total da argila comercial, pela argila
de queima branca da regi?o de Santa Luzia no sul da Bahia e substitui??o parcial do feldspato
pelo res?duo de cinza da queima da casca de caf? conilon, da regi?o extremo sul da Bahia. O
objetivo das substitui??es destes materiais foi comprovar sua viabilidade t?cnica, bem como
focar aten??o da ind?stria cer?mica para o embri?o de p?lo cer?mico existente na regi?o sul e
extremo sul da Bahia, que possui reservas significativas de materiais nobres como a argila de
queima branca de Santa Luzia, caulins, quartzos e feldspatos, al?m de gerar volume
significativo do fundente alternativo, res?duo de cinza de queima da casca de caf? conilon. A
argila Santa Luzia ? mat?ria prima nobre cuja atual aplica??o comercial ? na produ??o de
telhas brancas. O fundente res?duo de cinza de casca de caf? ? descartado nos locais de
produ??o com impacto ambiental negativo. Foram utilizados diagramas de fase e
delineamento de misturas para otimiza??o e redu??o de custos na pesquisa. Os resultados
comprovaram as expectativas de obten??o de isoladores el?tricos cer?micos com a argila de
queima branca de Santa Luzia, e substitui??o de at? 35,4 % do feldspato, por res?duo tratado
de cinza de queima de casca de caf? conilon. O delineamento de misturas que apresentou os
melhores resultados foi para a formula??o com percentuais de: argila 26,4 a 30,4%; caulim
14,85 a 17,1%; feldspato de 12,92 a 16,96%; res?duo R2 de 7,08 a 9,2% e quartzo de 32,5 a
38,75%, percentuais em rela??o ? massa total da mistura. Os melhores resultados indicados
pelo modelo do delineamento de misturas foram; porosidade 0,2 a 1,4%, absor??o de ?gua de
0,1 a 0,7%, resist?ncia mec?nica ? flex?o de 35 a 45 MPa, rigidez diel?trica de 35 a 41
kV/cm, resistividade transversal de 8x109
a 2,5x1010
?.cm e a constante diel?trica ? /?0 de 7 a 10,4, atendendo aos par?metros para fabrica??o de isoladores el?tricos cer?micos de baixa e m?dia tens?o. / The electrical ceramic insulators industry, uses noble raw materials such as siliceous
and aluminous clays of white burning, in order to provide plasticity of the mass and contribute
to electrical and mechanical properties required of the product, and feldspar with the flux
function In literature references the composition of the masses indicates that the clay
participates in percentage between 20 and 32, and feldspar 8 to 35, these materials have
significant cost. In this research was performed the total replacement of commercial clay, for
white burning clay from Santa Luzia region in southern Bahia and partial replacement of
feldspar by ash residue of husk conilon coffee burning, from extreme south of Bahia. The
objective of replacement these raw materials is to aver its technical feasibility and call
attention for the embryo pole of ceramic industry for the existing in the south and extreme
south of Bahia, which has significant reserves of noble raw materials such as clay white
burning, kaolin, quartz and feldspar, and generates significant volume of gray husk conilon
coffee as alternate flux. Clay Santa Luzia is prima noble material whose current commercial
application is the production of white roofing. The residue of coffee husk ash is discarded
near of production sites and is harmful to the environment. Phase diagrams and statistic
design of experiments, were used for optimization and cost savings in research. The results
confirmed the expectations of obtaining electrical ceramic insulators, with white burning clay
of Santa Luzia and partial replacement up to 35.4% of feldspar, by treaty residue of conilon
ash coffee husk burning. The statistic design that showed best results was for formulation
with percentages of: clay 26.4 to 30.4%; kaolin 14.85 to 17.1%; feldspar 12.92 to 16.96%; R2
residue 7.08 to 9.2% and Quartz 32.5 to 38.75%, relative to the total mass of the mixture. The
best results indicated; 0.2 to 1.4% apparent porosity , water absorption 0.1 to 0.7%, flexural
strength 35 to 45MPa , dielectric strength 35-41 kV/cm , the transverse resistivity 8x109
2.5x1010 ?.cm and for the dielectric constant ?/?0 7 to 10.4, specification parameters for
manufacturing ceramic electrical insulators of low and medium voltage.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20092 |
| Date | 24 February 2015 |
| Creators | Gon?alves, Joel Nogueira |
| Contributors | 50580396720, http://lattes.cnpq.br/5460040602567184, Peres, Ana Paula da Silva, 05724168499, http://lattes.cnpq.br/9975840346577976, Dultra, Eduardo Jorge Vidal, 02551707692, http://lattes.cnpq.br/2132307633780425, Silva, Elialdo Chiberio da, 85241580425, http://lattes.cnpq.br/5426129339908081, Silva, Vamberto Monteiro da, 67456863415, http://lattes.cnpq.br/7962325767490100, Acchar, Wilson |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM CI?NCIA E ENGENHARIA DE MATERIAIS, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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