Silicon Carbide Powder
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Nitretação por descargas elétricas da liga Ti-6Al-4V com adição de pó abrasivo SiC ao fluido dielétrico
RESUMO O processo de nitretação que usa Usinagem por Descargas Elétricas é um método que associa a capacidade de usinar superfícies complexas com a obtenção de tratamento termoquímico de nitretação. A fonte de nitrogênio é proveniente da uréia, que compõe o fluido dielétrico juntamente com água deionizada. A liga de titânio Ti-6Al-4V possui
Matéria (Rio J.). Publicado em: 16/09/2019
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2. A novel thermal plasma-based technology for submicronic silicon carbide production at pilot scale
Resumo Pó submicrométrico de carboneto de silício foi sintetizado em um novo reator piloto de tocha a plasma por radiofrequência. Os precursores foram pós de cinza de pirólise e sílica com tamanhos micrométricos. A taxa de massa do pó de precursor variou na faixa de 600-2500 g/h. O tempo máximo do teste foi de aproximadamente 3 h. Com o objetivo de
Cerâmica. Publicado em: 2019-01
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3. Diamond Films on Stainless Steel Substrates with an Interlayer Applied by Laser Cladding
The objective of this work is the Hot Filament Chemical Vapor Deposition (HFCVD) of diamond films on stainless steel substrates using a new technique for intermediate barrier forming, made by laser cladding process. In this technique, a powder layer is irradiated by a laser beam to melt the powder layer and the substrate surface layer to create the interlaye
Mat. Res.. Publicado em: 06/03/2017
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4. Growth and Characterization of Graphene on Polycrystalline SiC Substrate Using Heating by CO2 Laser Beam
The thermal decomposition of silicon carbide (SiC), with the subsequent formation of graphene, can be achieved by heating treatment. Several heating processes have been applied for this purpose by using SiC, either in form of powder particles or monocrystalline substrate. In this work, instead of using an expensive commercially available SiC wafer, a polycry
Mat. Res.. Publicado em: 26/09/2016
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5. Development, microstructural and mechanical caracterization of SiC ceramics with alumina and rare earth oxides additions / Desenvolvimento, caracterização microestrutural e mecânica de cerâmicas de SiC aditivadas com alumina e óxidos de terras raras
In this work, the mechanical properties are determined at room temperature (hardness and fracture toughness) and high temperatures (compressive creep) of SiC ceramic samples with alumina (Al2O3) and rare earth oxides (REO) additions. The REO is obtained by REC (rare earth concentrate - Nuclemon) calcinations, which contains 76 wt % of yttria (Al2O3). Three c
Publicado em: 2006
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6. Effect of heat treatment on Fe-B-Si-Nb alloy powder prepared by mechanical alloying
The effect of heat treatment on crystallization behavior of Fe73.5B15Si10Nb1.5 alloy powder prepared by mechanical alloying was studied. The powder samples were prepared by mechanical alloying (MA) and for different milling times (1, 5, 25, 70 and 100 hours). Crystalline powders of iron, boron, silicon and niobium were sealed with tungsten carbide balls in a
Materials Research. Publicado em: 2005-06
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7. Influence of high sintering pressure on the microhardness and wear resistance of diamond powder and silicon carbide-based composites
The work reported on here involved the development of several samples of "diamond-SiC" composite produced under sintering pressures of up to 9.0 GPa at temperatures of up to 1973 7K. The average size of the diamond micropowder crystals used was 40/28 µm. The sintering process was carried out in a 2500-ton hydraulic press equipped with an anvil-type high-pre
Materials Research. Publicado em: 2004-06
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8. OBTENÇÃO E AVALIAÇÃO DO COMPORTAMENTO À FADIGA DE COMPÓSITOS DE MATRIZ DE ALUMÍNIO SUBMETIDOS A DIFERENTES TRATAMENTOS SUPERFICIAIS MECÂNICOS / OBTENTION AND EVALUATION OF THE FATIGUE BEHAVIOUR OF ALUMINIUM MATRIX COMPOSITES SUBJECT TO DIFFERENT MECHANICAL SURFACE TREATMENTS
The objective of this work was the evaluation of the fatigue behaviour of aluminium metal matrix composites (MMC) obtained by powder metallurgy. The testing variables were the volumetric fraction of reinforcements and the type of mechanical surface treatment used. Initially, the composite materials were obtained from aluminium AA 1100 matrix, reinforced with
Publicado em: 2000
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9. Electrical conductivity of borate, silicate and silica-sulphate glasses of alkaline ions. / Condutividade elétrica de vidros de boratos, silicatos e sílico-sulfatos de íons alcalinos.
Conducting glasses based on borates, silicates and silica-sulfates of alkali metals have been prepared from an appropriate mixture of powder of oxides, carbonates and sulfates. They were produced by fusion in a silicon carbide furnace up to 1400ºC and then by fast cooling. These materials have been analyzed with techniques of DC conductivity and Impedan
Publicado em: 2000
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10. Efeito da adição de carboneto de silício em pó na geração de microtrincas e na topografia da superfície na usinada por descargas elétricas do aço-rápido ABNT M2 / Effect of the addition of silicon carbide powder on the microcrack generation and on the surface topography in electrical discharge machining of ABNT M2 high speed steel,
This work investigates surface topography and microcrack generated by electrical discharge machining in workpieces of high speed steel (ABNT M2). Three different commercial dielectric fluids are used with and without addition of silicon carbide powder. Electrodes of electrolytic copper are used in roughing operations. The microcracks are evaluated using SEM
Publicado em: 1999
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11. OBTAINMENT, MACHINING AND WEAR OF METAL MATRIX COMPOSITES PROCESSED BY POWDER METALLURGY. / OBTENÇÃO, USINAGEM E DESGASTE DE MATERIAIS COMPÓSITOS DE MATRIZ METÁLICA PROCESSADOS VIA METALURGIA DO PÓ.
The aim of this investigation was the obtainment of metal matrix composites (MMC) by the route of powder metallurgy, and the valuation of these materials with relation to their machining and wear characteristics. Firstly, were obtained pure comercial aluminium matrix composites materials, with 5, 10 and 15% volumectric fraction of silicon carbide particles.
Publicado em: 1998