Jornadas CeFEMA 2019

Session

Materials Processing

17 Sept 2019, 09:35

Anfiteatro Abreu Faro (Instituto Superior Tecnico, Campus Alameda)

Conveners

Materials Processing

• Célio Pina

18. The influence of glaze on the tribological properties of zirconia dental pieces obtained by subtractive and additive manufacturing

Ana Catarina Branco

17/09/2019, 09:35

Ceramic based prosthetic materials are highly used for the repairing/replacing of a damaged/missing tooth, due to their suitable mechanical and aesthetic properties, chemical stability and biocompatibility. Additive manufacturing (AM) has emerged as new methodology to obtain long term 3D dental pieces at low cost, decreasing the materials’ waste and production time relatively to the...

21. On the wear behaviour of LASER clad Colmonoy-6 coatings under corrosive media

Ivan Rodrigues

17/09/2019, 09:50

The process of laser cladding using Ni-Cr-B-Si-C alloy powders has gained relevance as a method to produce hardfacing coatings that provide excellent surface wear and corrosion resistance in a corrosive environment. However, under chemically aggressive media, the wear performance of such coatings is dependent on the synergic interaction between mechanical wear and electrochemical corrosion...

19. Ageing of single crystalline laser deposited René N4 nickel superalloy

José Cardoso

17/09/2019, 10:05

The outstanding creep and thermal fatigue resistance of the high-temperature alloys used in the hot section of gas turbine engines for the aerospace and energy production industries are ensured by a single-crystalline structure and a microstructure composed of cuboidal γ' phase precipitates densely distributed in a γ phase matrix, which is generated during a complex ageing treatment. This...

20. Influence of laser surface nanotexturing on the friction of silicon in dry sliding conditions

Isabel Alves Lopes

17/09/2019, 10:20

The aim of the present work was to understand the role of Laser-Induced Periodic Surface Structures (LIPSS) on the friction behavior of silicon. A uniform LIPSS texture was generated on Si using femtosecond pulsed laser radiation. The wear tests were performed using a reciprocating ball-on-flat nanotribometer in dry sliding conditions and using polytetrafluoroethylene (PTFE) as counterbody....