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Characterization of Cu2ZnSn(SSe)4 monograin powders by FE-SEM

Neves, Filipe; Livramento, Vanessa; Martins, Isabel M.; Esperto, Luís; Santos, Mário J. G.; Correia, J. Brito; Muska, K.; Holopainen, T.

The design and synthesis of high-efficiency materials to convert solar to electrical energy is an increasingly important research field. Within the photovoltaic technologies, crystalline Si have an 80% share while the remaining 20% are mostly thin film solar cells based on Cu(In,Ga)(S,Se)2 (CIGSSe) and CdTe [1,2]. However,the cost, the abundance and the environmental impact of the elemental components cannot be...

Data: 2013   |   Origem: Repositório do LNEG

Role of ogyxen and nitrogen in mechanical alloying mechanism of Ni-Ti powder mi...

Neves, Filipe; Fernandes, F. M. Braz; Martins, Isabel M.; Correia, J. Brito

In this study, the critical milling behaviour of Ni-Ti powder mixtures was evaluated in relation to the effect of atmospheric gases, more specifically to oxygen and nitrogen. Within the experimental conditions used, it is shown that both gases play an important role in the alloying process and that not only oxygen gas reacts with the mechanically alloyed powders but also nitrogen. The most effective mixing occu...

Data: 2012   |   Origem: Repositório do LNEG

In situ experiments with synchrotron high-energy x-rays of Ni-Ti alloys produce...

Neves, Filipe; Correia, J. Brito; Martins, Isabel M.; Fernandes, F. M. Braz; Mahesh, K. K.; Stark, A.; Schell, N.

The structural evolution that takes place during the homogenization heat treatments of powder metallurgical Ni-Ti- alloys was studied by in situ synchrotron diffraction. It is proposed to get a deeper understanding of this phenomenon by using different types of thermal/mechanical cycles.

Data: 2012   |   Origem: Repositório do LNEG

Characterization of Cu2ZnSn(SSe)4 monograin powders by FE-SEM

Neves, Filipe; Livramento, Vanessa; Martins, Isabel M.; Esperto, Luís; Santos, Mário J. G.; Correia, J. Brito; Muska, K.; Holopainen, T.

The design and synthesis of high-efficiency materials to convert solar to electrical energy is an increasingly important research field. Within the photovoltaic technologies, crystalline Si have an 80% share while the remaining 20% are mostly thin film solar cells based on Cu(In,Ga)(S,Se)2 (CIGSSe) and CdTe [1,2].

Data: 2012   |   Origem: Repositório do LNEG

Nonconventional production technologies for NiTi shape memory alloys

Neves, Filipe; Fernandes, F. M. Braz; Martins, Isabel M.; Correia, J. Brito; Oliveira, M.; Gaffet, E.; Wang, T. Y.; Lattemann, M.; Suffner, J.; Hahn, H.

The development of new production technologies for NiTi Shape Memory Alloys (SMAs) is always challenging. Recently, we introduced two powder metallurgical (PM) processing routes involving mechanical activation of elemental powder mixtures and densification through extrusion or forging. Those processes were named Mechanically Activated Reactive Extrusion Synthesis (MARES) and Mechanically Activated Reactive FOrg...

Data: 2009   |   Origem: Repositório do LNEG

Avaliação estrutural do aço rápido M3/2 sinterizado através da tecnologia DMLS

Esperto, Luís; Martins, Isabel M.; Santos, Mário J. G.

O estudo da sinterização do pó de aço rápido M3/2 pela tecnologia DMLS baseou-se na utilização de diferentes parâmetros de processo e na optimização da respectiva distribuição granulométrica e densidade aparente. O material foi sinterizado em linha, área e volume utilizando uma distância entre linhas de varrimento constante (0.30mm), três velocidades de varrimento do laser (50, 150, 250mm/s) e duas potências de...

Data: 2008   |   Origem: Repositório do LNEG

Metallurgical evaluation of laser sintered M3/2 HSS powder

Martins, Isabel M.; Esperto, Luís; Domingues, Joaquim Resina; Santos, Mário J. G.

Direct Metal Laser Sintering (DMLS) is one of the leading commercial rapid tooling (RT) technologies that produce 3D fully functional parts and tools directly from a CAD model. High Speed Steels (HSS) have the desired combination of hot hardness, wear resistance and toughness needed for applications such as cutting tools, special tools, inserts and dies that can be successfully developed in a near net shape by ...

Data: 2007   |   Origem: Repositório do LNEG

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    Financiadores do RCAAP

Fundação para a Ciência e a Tecnologia Universidade do Minho   Governo Português Ministério da Educação e Ciência Programa Operacional da Sociedade do Conhecimento União Europeia