dc.contributorPhotonics Division
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorInstituto Tecnológico de Aeronáutica (ITA)
dc.contributorMaterials Division
dc.date.accessioned2014-05-27T11:26:31Z
dc.date.available2014-05-27T11:26:31Z
dc.date.created2014-05-27T11:26:31Z
dc.date.issued2012-05-22
dc.identifierMaterials Research Society Symposium Proceedings, v. 1373, p. 31-36.
dc.identifier0272-9172
dc.identifierhttp://hdl.handle.net/11449/73335
dc.identifier10.1557/opl.2012.292
dc.identifier2-s2.0-84861123727
dc.description.abstractPayload and high-tech are important characteristics when the goals are aerospace applications. The development of the technologies associated to these applications has interests that transcend national boundaries and are of strategic importance to the nations. Ultra lightweight mirrors, supports and structures for optical systems are important part of this subject. This paper reports the development of SiC substrates, obtained by pressing, to be applied on embedded precision reflective optics. Different SiC granulometries, having YAG as sintering additive, were processed by: ball milling, drying and deagglomeration, sift, uniaxial and isostatic pressing, and, finally, argon atmosphere sintering at 1900°C. Different porosities were obtained according to the amount of organic material added. Into one side of the samples pellets of organic material were introduced to generate voids to reduce the weight of samples as a whole. The substrates were grinding and polished, looking for a SiC surface having low porosity, as porosity is directly related to light scattering that should be avoided on optical surfaces. Laser surface treatments were applied (using or not SiC barbotine) as a method to improve the surface quality. The samples were characterized by optical and laser confocal microscopy, roughness measurements and mechanical tests. The results are very promissory for future applications. © 2012 Materials Research Society.
dc.languageeng
dc.relationMaterials Research Society Symposium Proceedings
dc.relation0,139
dc.rightsAcesso aberto
dc.sourceScopus
dc.subjectArgon atmospheres
dc.subjectBarbotine
dc.subjectDeagglomeration
dc.subjectFuture applications
dc.subjectGranulometries
dc.subjectIsostatic pressing
dc.subjectLaser confocal microscopy
dc.subjectLaser surface treatment
dc.subjectLow porosity
dc.subjectMechanical tests
dc.subjectOptical surfaces
dc.subjectOrganic materials
dc.subjectReflective optics
dc.subjectSiC substrates
dc.subjectSilicon carbide substrates
dc.subjectSintering additives
dc.subjectUltra lightweight mirror
dc.subjectYAG
dc.subjectAerospace applications
dc.subjectBall milling
dc.subjectConfocal microscopy
dc.subjectPorosity
dc.subjectSintering
dc.subjectSilicon carbide
dc.titleDevelopment of silicon carbide substrates for aerospace applications
dc.typeActas de congresos


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