Encontrados 16 documentos, a visualizar página 1 de 2

Mechanical and electrochemical deterioration mechanisms in the tribocorrosion o...

Tribocorrosion of Al-Si-Cu-Mg alloys was investigated in 0.05 M NaCl and 0.1 M NaNO3 solutions under severe sliding and controlled electrochemical conditions. A simple galvanic coupling model was developed to analyze and quantitatively predict the evolution potential of the open circuit potential during tribocorrosion. According to this model and the obtained results, galvanic coupling was established in the Na...

Mechanical behaviour of fibrous braided structures for ligament tissue reinforc...

Influence of SiC reinforcement particles on the tribocorrosion behaviour of Al–...

The main aim of this work was to study and understand the influence of SiC particles on the corrosion and tribocorrosion of Al-matrix composite materials. For that, Al–SiCp functionally graded composites were produced by centrifugal casting and different SiCp contents were achieved. Their mechanical properties were improved by age-hardening heat treatments. The tribocorrosion behaviour was studied in 0.05M NaCl...

Effect of Al2Cu precipitates size and mass transport on the polarisation behavi...

The electrochemical behaviour of age-hardened Al–Si–Cu–Mg alloys was investigated in a 0.05 M NaCl solution under controlled mass transport conditions using a rotating disk electrode. This work aimed at getting better understanding of the effect of the alloy microstructure, in particular the size distribution of Al2Cu phase, on the corrosion behaviour of the alloy. Three different size distributions of the Al2C...

Influência da incorporação de partículas de SiC na microestrutura e no comporta...

Devido à boa relação entre densidade e resistência mecânica apresentada pelos compósitos de matriz de alumínio, estes materiais têm-se destacado em algumas aplicações industriais. Com efeito, a adição de reforços cerâmicos às ligas de alumínio, nomeadamente partículas de SiC, resulta na melhoria das suas propriedades mecânicas com particular impacto no aumento da resistência ao desgaste, ampliando o seu campo d...

Wetting in Al composites reinforced with SiC particles

Aluminium matrix composites have been wide used essentially due to the good relation between weight and mechanical resistance. To develop a ceramic particle/matrix interface with good characteristics, it is essential to control the interface reactivity, avoiding the formation of undesirable reaction products such as Al4C3. Essentially, there are three methods to prevent the Al4C3 formation: Si addition to Al m...

Influence of pH and corrosion inhibitors on the tribocorrrosion of titanium in ...

Dental implants are used to replace teeth lost due to decay, trauma, or periodontal iseases. Dental implants are most of the times ubjected tomicro-movements at the implant/bone interface or implant/porcelain interface (due to the transmitted mastication loads) and chemical solicitations (oral environment). Such implant becomes part of tribocorrosion system, which may undergo a complex degradation process that...

Effect of silicon carbide particles on the microstructure and tribological beha...

Aluminium matrix composites have been wide used essentially due to the good relation between weight and mechanical resistance. Also, the additions of ceramic reinforcement, mainly SiC particles, improve some properties of these composites, particularly wear resistance. Additionally, when functional gradients of properties are promoted in this type of composites, a wide range of properties are improved. This typ...

Fretting-corrosion behaviour and repassivation evolution of Ti in artificial sa...

Dissertação de Mestrado em Processamento e Caracterização de Materiais ; Degradation of Ti dental implants is a common process usually caused by mechanical stress and/or by the physiological environment (human saliva) that surround the implant. These types of implant are most of the time subjected to micro-movements at the contact region with bone or at the implant/porcelain interface (due to the transmitted m...

Tribocorrosion behaviour of plasma nitrided and plasma nitrided+oxidised Ti6Al4...

This paper reports the influence of low pressure plasma nitriding treatments, some of them followed by plasma assisted oxidation on the mechanical properties and tribocorrosion resistance of a Ti6Al4V alloy. Nitridation was performed for 640 or 720 min at 600 and 700 °C in a r.f. plasma equipment, using a N2–H2 gas mixture at 7.5 Pa. Some of the samples were then post-oxidized at 700 °C for 15 and 60 min, withi...