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This invention relates to new compositions of polymerisable liquid sealants for use in impregnating and sealing pores in cast metal and powdered metal articles. Some proportion of cast articles and all powdered metal articles, typically have a network of pores that extends through or partially through the wall of the article. This phenom-enon results in gaseous or fluid leakage from the
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The measured dissipation factor and breakdown strength of liquid nitrogen impregnated polyethylene paper insulation for cryogenic power cable are presented. The effect of screening, and impulse and ac deteriorations are discussed. The tests were carried out using model cable type specimens.
In order to determine K~c in a simplified form, rectangular pieces of glass were scratched with a glazier's diamond, considering this scratch as the crack tip. The sides of the crack were made by sticking two rectangular pieces of proper thickness with epoxy resin as was made in a previous work. The
The aim of this study was to determine the basic rheological parameters of phenolic resin as a possible liquid matrix precursor for impregnation of carbon-carbon composites. Typical pseudo-plastic behaviour was observed. The dependencies of viscosity on concentration, temperature and time were measu
Nickel containing HMFI, HMOR and HBEA zeolites was prepared by impregnation and liquid-and solid-state ion exchange. The kinetics of the solid-state ion exchange of the protons (BrΓΉnsted acid sites) with NiCl 2 was followed by IR and TPE measurements. The results were compared to catalysts prepared