The project consisted of design and construction of a mechanical prototype that allows the growth of vegetables in a rotary vertical garden. For the vegetables to grow properly, the structure of the prototype rotates in order to provide them homogeneous sunlight. Currently, the movement of vertical structures is carried out with motors and mechanical transmission systems; however, in this case it was to carry it out with shape memory materials (SMMs), which could rotate the system with the application of electric current, hot air or sunlight. During the development of the prototype, it was possible to use previously designed equipment where experiments can be carried out to characterize the behaviour of the SMMs, applying different voltages to them. This work shows the methodology used to involve students, from two institutions, in the design stages, taking advantage of experimental tests, digital resources on the internet; as well as the application of active methodologies such as project-based learning and flipped classroom. Finally, a proposal is presented for the remote operation of the equipment used in the characterization of the materials and their use as learning technics.
The AISI 316L steel is a material used to manufacture prostheses and medical instruments due to its high corrosion resistance. However, its wear resistance is low, but it can be improved by synthesizing thin films of titanium nitride (TiN) on the surface. This compound is a hard material that improves its tribological and corrosive properties, in addition to presenting good adhesion to the substrate. In this work, a Ti/TiN thin film was obtained using the Physical Vapor Deposition (PVD) technique. This coating was characterized by scanning electron microscopy, energy dispersion spectroscopy (EDS), and light microscopy; additionally, tribological tests under wet conditions and adhesion tests were conducted. The coating showed good adhesion to the substrate according to the VDI standard. In tribological tests, a low coefficient of friction vs. a polyethylene pin in a wet environment (bovine serum) was obtained. The EDS showed a high concentration of Ti and N on the substrate even after wear tests.
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