577 research outputs found
Innovation, technology transfer and development: the spin-off companies
No full textThe article starts from the identification of the reasons why Italy is less prone to technology transfer than other countries, and indicates some key issues for the diffusion of technological innovations and the development of human capital. In particular, technology transfer is not a generic form of exploitation of outcome of the research, it involves specific actions that have impact on economic production, such as the patenting and the creation of new companies (spin-offs). The author discusses the various forms of spin-offs of university research, the evolution of the phenomenon in the structures of the uni- versities, the stages of development of a spin-off company and the current fund- ing arrangements and to be promoted
Sviluppo di una metodologia di prova per test di ciclaggio termico su materiali compositi in lega leggera a matrice di alluminio
No full textStatistical evaluation of Vicker's indentation test results for thermally sprayed materials
No full textIn this experimental investigation, Vicker's microhardness tests were used to assess the heterogeneity of a wide range of thermally sprayed coatings. Three different loads were used to evaluate the influence of the test volume on load-hardness dependence. Statistical elaboration of obtained results were performed by using variance analysis, Student's and Fisher's tests, Gaussian and Weibull distributions, Meyer's theory, in order to separate variation due to scatter of data and due to different materials properties. A load-hardness dependence was evidenced especially for ceramic coatings, due to their brittle nature, whereas for the two metallic coatings tested (Ti-6Al-4V and CoNiCrAlY) a bimodal distribution seems to exist at small loads
Grain boundary effects on the behavior of WE43 magnesium castings in simulated marine environment
No full textSalt spray tests were conducted on the Mg-Y-Nd-Zr WE43-T6 alloy castings to determine the effects of corrosion attack on its tensile strength at room temperature. To validate the results, specimens from A356-T6 castings were also tested. The experimental results proved the superiority of A356 castings as compared to WE43 alloys, in terms of mass loss, strength reduction and materials corrosion degradation
I rivestimenti ceramici per l’ingegneria delle superfici: stato dell’arte ed innovazione di prodotto e di processo - Os revestimentos cerâmicos para a engenharia das superfícies: estado da arte e inovação de produto e de processo
No full text
Air plasma sprayed metallic coatings for sour environments
No full textAmong protective coatings for components used in petrochemical applications, plasma sprayed alloys containing chromium, nickel, and molybdenum have potential to provide functional surfaces with good resistance to corrosion and wear. They could offer a cost effective solution by limiting the use of expensive bulk materials such cls Inconel or Hastelloy superalloys or highly alloyed chromium stainless steels, since a low cost base material could be selected to give the required mechanical strength combined with suitable corrosion resistance from its modified surface. To limit fabrication costs of coating deposition. air plasma spraying techniques can be proposed, but proper optimisation of the plasma processing parameters is required to increase coating performance. In this paper: coatings based on Ni-Cr-B-Si and Mo alloys have been deposited following (I design of experiment methodology. Results of characterisation tests for preliminary spraying trials (metallographic, tribological, and corrosion tests) are reported and discussed. Following analysis of numerical results, a coating obtained by the codeposition of two commercial powders (Metco 505 and Metco 16C) was sprayed on carbon steel substrates. Sulphide stress corrosion cracking tests, according to the NACE TM 0177-90 standard, at up to 90% of the yield stress of the coated specimens did riot induce any damage for test durations of up to 720 h. Tribological properties have also been evaluated in terms of the slurry abrasivity response number (SAR), friction coefficients, and mass loss after ASTM standard ball on disc tests. Good resistance to erosion damage was obtained with a final SAR number of 37. (C) 2000 IoM Communications Ltd
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