Nondestructive testing in microfabrication using bacteria
| Autor: | A.R. Farinha, Rosa Maria Mendes Miranda, Telmo G. Santos, C.C.C.R. Carvalho, Maria Teresa Vieira, T.J. Ferreira |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Rhodococcus erythropolis business.industry 020502 materials Sintering 02 engineering and technology 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering Temperature and pressure 0205 materials engineering Nondestructive testing Ultimate tensile strength Forensic engineering General Materials Science Process optimization Composite material 0210 nano-technology business Powder injection molding Microfabrication |
| Zdroj: | Ciência & Tecnologia dos Materiais. 29:e262-e264 |
| ISSN: | 0870-8312 |
| Popis: | Micromanufacturing has increased rapidly at scientific, technological and industrial levels. However, this evolution has not been followed by a parallel development of Non Destructive Testing (NDT) techniques. The available techniques are, generally, unable to detect microdefects. In this work, two types of microgeometries were produced by Micro Powder Injection Molding (μPIM) of stainless steel AISI316L: specimens for tensile tests (simple geometry) and microscrews (complex geometry). During the process optimization, different injection conditions of temperature and pressure were tested, as well as various temperatures for thermal debinding and sintering. Throughout the process, detectable and undetectable defects by NDT techniques were produced, which were used in the assays to assess the role of bacteria in the detection of defects. After adding bacterial suspensions of Staphylococcus aureus or Rhodococcus erythropolis cells, the microcomponents were subjected to magnetic or electric fields to facilitate mobility of bacteria towards the defects. This new methodology to detect defects produced during microfabrication can be a good solution for inspection of microdefects. |
| Databáze: | OpenAIRE |
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