The increasing interaction between laboratories from universities and research institutes with other society sectors, such as industries and government agencies, has led a growing number of those laboratories to adopt quality management systems based on international requirements standards. As a consequence, there is a crescent interest on practical information related to implementation of quality management systems in laboratories that provide testing services and carry out research activities. In this context, this article presents the practical approach applied for implementing a quality management system based on ISO/ IEC 17025 at the materials metrology division (Dimat)-Inmetro and at its laboratories. The approach is consistent with a hierarchical implementation, where the laboratory quality management system must fulfill ISO/IEC 17025 requirements as well as internal requirements from the upper layers of the quality management system. The implementing approach discussed here was specifically developed to be applied inside a particular hierarchical quality management structure. However, due to its general characteristics, it can be useful for diverse implementing cases.
In this study, the influence of electrolytic composition and time deposition parameters on the quality of titanium oxide coating was evaluated. The commercial Ti discs were anodized by micro-arc oxidation (MAO) process using calcium acetate monohydrate 0.5M (CaAc) and a mixture of calcium acetate monohydrate 0.5M and sodium beta-glycerophosphate 0.02M (CaAc + BGF) aqueous solutions. MAO was carried out by applying pulsed DC voltage of 150 V at different processing time (05, 15, 30, 45 and 60 seconds). The films were characterized by SEM, EDS, surface profilometer and XRD. Additionally, osteoblasts culture was carried out in order to verify the cytocompatibility of the anodized surfaces. The results showed the formation a well controlled homogenous microporous structures with irregular shapes for both electrolytes. Presence of Ca and P on the surface was found for films produced with CaAc + BGF electrolyte. Also, the adhesion, spreading, proliferation, and differentiation of osteoblast cells were very similar.
Sm(CoFeCuZr)z commercial magnets are manufactured by powder metallurgy
techniques. Microstructural investigations of Sm(CoFeCuZr)z magnets have shown that, increasing
the Zr content, some impurity phases may appear. An alloy with composition (at%): 60.5% Co –
15.5% Fe – 11.5% Zr - 8.5% Sm - 4% Cu, homogenized at 1050oC, was investigated. Three main
phases were identified: rhombohedral 1:3 (ZrSm)1(CoFeCu)3, hexagonal 1:7 (SmZr)1(CoFeCu)7 and
cubic 6:23 (Zr)6(CoFe)23. Knowledge of possible phases present in 2:17-type magnets allows a
better understanding of the nanocrystalline microstructure responsible for high coercivity of these
magnets.
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