Chemical

Advances in Materials. Proceedings of a Symposium Organised by Yong Zhou

By Yong Zhou

Advances in fabrics surveys the advancements in fabrics technological know-how and expertise. This publication examines the restrictions imposed through fabrics at the improvement of expertise.
Organized into 34 chapters, this e-book starts with an outline of the innovations in fixing the technical problem within the box of fabrics. this article then defines the tough environments thought of during this research, which come with mechanical rigidity, erosion, chemical assault, and thermal surprise at temperatures above approximately 1200°C. different chapters think of the profitable improvement of nuclear thermionic converters, which facilities seriously at the improvement of fabrics able to enduring quite tricky operating stipulations for longer classes of time. This booklet discusses to boot the suggestions, reminiscent of the planar and epitaxy method, hired within the creation of units. the ultimate bankruptcy offers with the speed of improvement within the gear utilized in the fabrication of plastics.
This ebook is a priceless source for polymer scientists, fabrics scientists, engineers, and metallurgists.

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Extra info for Advances in Materials. Proceedings of a Symposium Organised by the North Western Branch of the Institution of Chemical Engineers Held at Manchester, 6–9 April, 1964

Sample text

The ceramic to metal seal presents problems because certain ceramics and brazes used commercially in the seal construc­ tion show comparatively poor resistance to caesium attack. Alumina is one of the more important materials on which tests have been carried out and it is generally agreed that only high-purity sinters are resistant to caesium attack. Low-grade aluminas with a high silica content disintegrate when exposed to caesium liquid or vapour at temperatures approaching 450°C. The attack is on the silica phase and consequently the silica must be eliminated from aluminas intended for use in caesium.

The evaporation rate was estimated as 2 x 10~7 g cm~2 s" 1 at 2270°K. A polishing technique which was satisfactory for unirradiated UC-ZrC left a slightly chipped surface on the irradiated material. Apart from the surface roughening there was no other marked difference in appearance under microscopic examination between irradiated and unirradiated UC-ZrC. Examination in an electron microscope of a shadowed replica taken from the etched surface of irradiated material revealed presence of unidentified grain boundary precipitates very similar in appearance to those found in unirradiated UC-ZrC which had been heat treated for 3 h at 2500°C (Fig.

Ii) Scattering by impurity centres or crystal (dislocations). defects Both these processes may be considered as contributing separately to the total scattering of the charge carriers. We may therefore define our carrier mobility as being made up of two parts due to the two scattering processes: 1 1 μ J_ /Zi μα For materials of high purity and crystal perfection the first process will dominate and lead to a decrease of mobility with an increase of temperature. For crystals having many im­ perfections and/or impurity centres the second process be­ comes important and leads to lower mobilities.

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