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Home > All Images > 1990 > July > 19 Jul 1990

Images Dated 19th July 1990

Choose from 7 pictures in our Images Dated 19th July 1990 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Plasma carburising Featured 19 Jul 1990 Print

Plasma carburising

A technician observes a machine part undergoing plasma carburisation, a surface hardening process, through the inspection port of a plasma chamber. The overlayed graph is produced on a mass spectrometer and provides an analysis of the surface composition of the part; the proportions of various elements have a marked effect on the properties of steel alloys. Essentially the process involves exposing the part to a plasma containing the correct mixture of elements needed to produce the desired characteristics. Ions from the plasma dissolve into the steel (which is given a negative charge to attract them) thus forming a new, harder, alloy at the surface

© DAVID PARKER/SCIENCE PHOTO LIBRARY