An Introduction to Metallurgical Laboratory Techniques: by P. G. Ormandy, K. Guy

By P. G. Ormandy, K. Guy

Pergamon sequence of Monographs in Laboratory ideas, quantity three: An advent to Metallurgical Laboratory concepts covers better tools and methods in metallurgy in relation to the sensible features of laboratory paintings, through experimentation, perform and event. The booklet discusses metallography, hot temperature, warmth remedy, and trying out of fabrics. The textual content additionally describes vacuum innovations, powder metallurgy, and becoming a member of of metals. actual metallurgists and scholars taking similar classes will locate the e-book important.

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Resistance wire insulated with insulating beads may be used for the heating element, but the bath tends to operate more reliably if wound with a " P y r o b a r " heating element. These elements are obtainable commercially, but the manufacturer's literature should be consulted to ensure that the element obtained is of a sufficient rating to raise the bath to the desired temperature. F o r lead baths the " P y r o b a r " should be surrounded with a sheet of stainless steel or nickel, to safeguard the element from pieces of lead oxide which m a y find their way down the side of the bath and burn out the heating element by slagging away its protective sheath.

This furnace is capable of operating in the temperature range 0-1200 °C. ) FIG. 2. Box or muffle furnace. This type of furnace is capable of being heated to 1200°C. ) FIG. 6. Optical disappearing filament pyrometer. (Courtesy of Cambridge Instrument Co. ) FIG. 7. Hounsfield Tensometer. ) F I G . 4 . 1 6 . Hounsfleld balanced impact machine. ) FIG. 24. Vickers pyramid hardness-testing machine. ) High Temperatures the life of the furnace. The cement also ensures that the winding cannot react with the insulating material.

The wound and cemented tube should be carefully placed in position, ensuring that it engages correctly into the hole bored in the end support. The cylinder of duralumin is then placed in 42 High Temperatures position, and a length of string or wire fastened around the top and bottom to retain the shape of the cylinder. Where the two edges of the cylinder overlap, a series of equally spaced holes are drilled down its length, to accommodate rivets or screws and nuts. These replace the string, and at this stage the cylinder is filled with insulating material, ensuring that the tube is held perfectly vertical.

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