No description available.

Thesis (Ph. D)--Ohio State University, 2002. / Title from first page of PDF file. Document formatted into pages; contains xv, 203 p.: ill. Includes abstract and vita. Advisor: Rudolph G. Buchheit, Dept. of Materials Science and Engineering. Includes bibliographical references (p. 192-203).

A vacuum deposition system was built enabling flexible polymer sheet, wound on a roll-to-roll transport mechanism, to be coated by any or all of three planar magnetron sputtering sources. Using this machine a large variety of coatings were produced in long lengths onto heat sensitive substrates and with controlled stoichiometry. Within the system the coating was monitored soon after deposition which allowed fast response to changing film properties, a critical factor in the continuous production of high quality coatings. An area of current interest has been the production of large area optical filters, the basis of which is the deposition of thin metal and thin metal oxide films. Of particular interest have been the 'heat mirror' type filters, the transparent conducting oxides and more recently the electrochromic devices. All these have been deposited at high rates onto flexible polyester substrates ostensibly at room temperature. Analysis of the films has been carried out by a variety of techniques in order to establish the precise chemical composition and structure of the films. Once optimum conditions had been established for individual films multilayer filters were produced and their optical performance determined. In the case of the 'heat mirror' type filters their performance was compared to theoretical predictions.

Thesis--Auburn University, 2006. / Abstract. Includes bibliographic references (p.94-97).

No description available.

This thesis is concerned with the production of metal-coated optical fibres, the fibres being drawn within a vacuum. Most common methods for producing optical fibres employ an oxy-gas ring burner or an inert gas resistance furnace to reach the high temperatures necessary to melt silica. These methods have the disadvantage of exposing the molten or hot silica fibre to the atmosphere before a protective coating is applied, thereby increasing the possibility of contaminants being present at the fibre surface. A novel though more elaborate method of producing fibres is described, with preliminary experimental results. Vacuum production allows the fibre to be metal-coated, using a magnetron sputtering technique, before exposure to the atmosphere, and the methods by which this is achieved are described. An electromagnetically operated optical fibre switch utilising a ferromagnetically-coated optical fibre is also described.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 64-66). Also available via the Internet.

Investigations were carried out to assess the role of primer, pretreatments and coating microstructure in preventing cutedge corrosion of chrome free organically coated steels. Zinc runoff was monitored from a range of organically coated steels with a large cutedge length exposed over 18 months at Swansea University roof top site. The zinc in the runoff leaches from the zinc-aluminium alloy coating of the substrate. The paint systems' corrosion performance was assessed by monitoring the levels of zinc in the runoff. Consequently the levels of zinc reflected the effectiveness of the applied paint system against corrosion. Runoff was high in initial months with zinc levels reducing with time due to the build up of corrosion products that hindered the progress of corrosion. An accelerated laboratory test using a distilled water electrolyte was developed that predict long-term external weathering runoff from panels of a range of organically coated steels. The corrosion mechanisms of a variety of organically coated Galvalloy steel have been examined using the scanning vibrating electrode technique (SVET) in 0.1%NaCI. The corrosion behaviour of a coating is related to the zinc-aluminium alloy coating structure and combination of pretreatment and primer. The SVET has been used to assess total zinc loss and the corrosion rate for a comparative measure of organically coating system performance. A correlation has been developed from SVET 24hour experiment data to accelerated weathering data and external weather data that can aid more accurately predicting the in service life of the product. Also considered were the effects of electrolyte conductivity on the morphology of corrosion on pure zinc. A mathematical model has been developed to predict corrosion pit population. Altered microstructure of solidifying zinc aluminium alloy melt via ultrasonication was investigated. Ultrasound irradiation significantly altered the final microstructure. The influence of morphed microstructure upon the corrosion behaviour was explored using the SVET in 0.1%NaCI. The ultrasound manipulated microstructure had generally a positive effect on the corrosion behaviour.

Thesis (MTech (Mechanical Engineering))--Peninsula Technikon, 2003. / Word processed copy. Summary in English. Includes bibliographical references (leaves 99-105). Also available online.

Incremental step load testing was used in accordance with ASTM F1940 to rank a number coating processes used in the fastener industry for their propensity to cause internal hydrogen embrittlement. The results showed that coating permeability has a first order effect, while the quantity of hydrogen introduced by the process has a second order effect. Pure zinc electroplating processes, alkaline and acid, were found to be the most embrittling, owing to the low permeability of zinc. The least embrittling processes were zinc-nickel, alkaline and acid, owing to the high permeability of Zn-Ni coatings. Non-electrolytic processes, namely phosphating, mechanical galvanising, DacrometRTM and Magni 555RTM were found to be non-embrittling. Hot dip galvanising was found to be highly embrittling, evidently due to trapped hydrogen being released by the thermal shock of up-quenching upon immersion in molten zinc. The full effect of up-quenching on the metallurgical and mechanical properties of high strength steel requires further investigation.