Tailor-made ceramic-based components—Advantages by reactive processing and advanced shaping techniques

Janßen, Rolf; Scheppokat, Sven; Claussen, Nils

doi:10.1016/j.jeurceramsoc.2007.12.022

Cited by 80 publications

(46 citation statements)

References 94 publications

(78 reference statements)

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“…The probable reason is the very low resolution. The second probable reason is reaction of SiO with aluminium and silicon diffusion into the matrix [13]. 2 More accurate data about interface microstructure was obtained by the TEM.…”

Section: Discussionmentioning

confidence: 99%

Studies of the AZ91 magnesium alloy / SiO₂-coated carbon fibres composite microstructure

Olszówka-Myalska

Botor-Probierz

2010

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The microstructure of magnesium matrix composite reinforced with SiO 2 nano-layer coated carbon fibres, deposited by sol-gel method was characterized. The composite was obtained by infiltration method and the effect of SiO 2 on the composite microstructure was analyzed by scanning electron microscopy combined with energydispersive X-ray spectroscopy (SEM+EDS) and transmission electron microscopy combined with energy-dispersive X-ray spectroscopy (TEM+EDS) methods. Good wettability of fibres by the magnesium alloy AZ91 (Al 9 wt%, Zn 0.3 wt%) was confirmed since fibres were closely surrounded with alloy and pulling-out effect was not visible. The interface region was evidently with aluminium enriched. Near carbon fibre surface a regular layer of SiO X oxide enriched with Al was detected by high angle annular dark field image (HAADF) combined with energy-dispersive X-ray spectroscopy (EDS). The plate or needle shaped very fine particles of Al 12 Mg 17 were identified near the AZ91 matrix zone by bright field (BF) and selected area electron diffraction (SADP).

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Section: Discussionmentioning

confidence: 99%

Studies of the AZ91 magnesium alloy / SiO₂-coated carbon fibres composite microstructure

Olszówka-Myalska

Botor-Probierz

2010

IOP Conf. Ser.: Mater. Sci. Eng.

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“…No caso de produção de lotes pequenos ou de componentes com geometrias complexas, a usinagem da cerâmica verde proporciona uma vantagem considerável em termos de qualidade, eficiência econômica e flexibilidade. Os processos convencionais de usinagem são possíveis devido à baixa resistência mecânica apresentada pelo estado verde do material, permitindo o uso de ferramentas de geometria definida e proporcionando altas taxas de remoção de material em comparação com a retificação de corpos cerâmicos sinterizados [10,11].…”

Section: Introductionunclassified

Análise do acabamento superficial e força de corte no torneamento de alumina a verde

et al. 2015

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RESUMOOs esforços de corte durante o torneamento de tarugos de alumina à verde e sua correlação com aspectos superficiais da peça foram estudados em condições experimentais. A correlação entre a força de usinagem e a taxa de remoção de material é um parâmetro importante na definição do projeto de produtos cerâmicos, já que, parâmetros inadequados produzem danos superficiais inaceitáveis na peça. O presente estudo analisou os esforços de corte obtidos durante o torneamento de peças de alumina com 99,8% de pureza no seu estado verde e monitorou a influência da profundidade de corte nestes; utilizando-se ferramentas de corte de cermet sob condições constantes de usinagem. Os esforços de corte foram relacionados com os acabamentos superficiais, desgastes nas ferramentas e temperaturas das ferramentas durante a usinagem. Verificou-se que a profundidade de corte não afetou consideravelmente a qualidade das superfícies. Entretanto, ensaios preliminares para seleção das condições de corte, mostraram que velocidades de corte e avanços inadequados geram danos à superfície da peça. Assim, a melhor condição de corte foi a de maior profundidade de corte, 1,0 mm, uma vez que, com profundidades de corte menores aumenta-se o número de passes necessários para remoção do sobre material da peça, o que inevitavelmente leva a maior desgaste da ferramenta, maior força de usinagem e pior acabamento superficial. Destaca-se que a alumina em seu estado verde apresentou elevado efeito abrasivo sobre a ferramenta durante o torneamento. A sinterização da peça produzida na melhor condição de corte indicou que a qualidade do acabamento na superfície verde foi mantida. Palavra-chave: cerâmica verde, usinagem, forças de corte. ABSTRACTIn experimental conditions, cutting forces were studied during turning of green alumina billets, including their correlation with surface aspects of the workpiece. The correlation between cutting power and the removal rate are important parameters for defining the design of ceramic products, since inadequate parameters can produce excessive surface damage to the workpiece. This study examined the forces obtained during turning of alumina workpieces with 99.8% purity in their green state, by means of a three-point dynamometer, evaluating the cutting, feed and depth forces, using a cermet tool under constant machining conditions. Variables were compared with the forces, including surface finish, tool wear and temperature during machining. In the study, it was found that the depth of cut had no significant effect on the surface quality, and the cutting speed and feed influencing the finish. However, preliminary tests for selecting the cutting conditions showed that unsuitables cutting speeds and feeds generate severe damage to the workpiece surface. The best condition was 1.00 mm depth of cut, and the forces increasedfor with each pass performed, with the feed force the variable with greatest increases in relation to the cutting and depth forces, and wear of the cutting tool directly influenced the surface finish, ge...

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“…Therefore, they have a potential for saving energy, reducing wear, and increasing the lifetime of components [1]. However, regardless of their remarkable properties, structural ceramics are not as widely used in industry as they should and could be.…”

Section: Introductionmentioning

confidence: 99%

Modelling of load transfer between porous matrix and short fibres in ceramic matrix composites

Silva¹,

Hotza²,

Janßen³

et al. 2011

Materials Characterisation V

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The aim of this work is to present a model of load transfer between porous matrix and short fibres in ceramic matrix composites. This analysis is based on the earlier shear-lag models used for polymeric composites. However, geometry and strength of fibres in addition to the matrix porosity are included in the present analysis. The theoretical curves for the longitudinal and shear stresses distributions along the fibre-porous matrix interface are presented. They exhibited a maximum strength point at the middle of the short fibres. It became evident that the critical length is governed by the relative properties of the fibres, matrix and porosity, which greatly influenced the load carrying capacity of the fibres in the composites. In addition, the present simplified solution facilitates the understanding of the interface mechanism using porous matrix.

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Tailor-made ceramic-based components—Advantages by reactive processing and advanced shaping techniques

Cited by 80 publications

References 94 publications

Studies of the AZ91 magnesium alloy / SiO₂-coated carbon fibres composite microstructure

Studies of the AZ91 magnesium alloy / SiO₂-coated carbon fibres composite microstructure

Análise do acabamento superficial e força de corte no torneamento de alumina a verde

Modelling of load transfer between porous matrix and short fibres in ceramic matrix composites

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Tailor-made ceramic-based components—Advantages by reactive processing and advanced shaping techniques

Cited by 80 publications

References 94 publications

Studies of the AZ91 magnesium alloy / SiO2-coated carbon fibres composite microstructure

Studies of the AZ91 magnesium alloy / SiO2-coated carbon fibres composite microstructure

Análise do acabamento superficial e força de corte no torneamento de alumina a verde

Modelling of load transfer between porous matrix and short fibres in ceramic matrix composites

Contact Info

Product

Resources

About

Studies of the AZ91 magnesium alloy / SiO₂-coated carbon fibres composite microstructure

Studies of the AZ91 magnesium alloy / SiO₂-coated carbon fibres composite microstructure