The Foundations of Vacuum Coating Technology
By D. M. Mattox

H

Hall effect
The development of a transverse electric field in a current-carrying conductor placed in a magnetic field. Hall-effect probes are used to measure magnetic field intensities.

See also Drift, EXB.

Halogenated solvents
(cleaning) Solvents containing the halogens (C1, F1, Br).

See also Chlorofluorocarbon (CFC) solvents.

Hard arc
High-current, sustained arc usually due to shorting (by a flake) or thermoelectron emission from a heated oxide particle on a high-voltage electrode.
Hard coating
A coating that extends the life of a tool that is subject to wear such as a drill bit, an extrusion die, an injection mold, etc. The mechanism may not be entirely related to hardness of the coating. For example, the coating can reduce the friction and thus prolong tool life or it may provide a diffusion barrier that prevents adhesion and galling.
Hard vacuum
(vacuum technology)

See also High vacuum.

Hard water
(cleaning) Water containing dissolved ions (e.g., Ca, Fe, Mn) that can leave a residue if evaporated or if they react with other chemicals such as phosphates to form water-insoluble compounds.

See also Soft water.

See also De-ionized (DI) water.

Hardness
The resistance of a surface to deformation. Generally measured by the resistance to indentation.
Haze
(cleaning) Surface morphology that gives diffuse reflection from an otherwise smooth (specular) surface. Example: Haze on a float glass surface from a residue of tin oxide.
Hearth
(e-beam evaporation) The water-cooled structure that has a depression called a pocket in which the material to be evaporated is contained.
Copyright Noyes Publications/William Andrew Publishing 2003 under license agreement with Books24x7
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