Polishing : Mechanical properties, Types Wikipedia, the free encyclopedia

Polishing

Rubbing a surface to make it smooth

Polishing is the process of creating a smooth and shiny surface by rubbing it or by applying a chemical treatment, leaving a clean surface with a significant specular reflection (still limited by the index of refraction of the material according to the Fresnel equations).^[1] In some materials (such as metals, glasses, black or transparent stones), polishing is also able to reduce diffuse reflection to minimal values.

When an unpolished surface is magnified thousands of times, it usually looks like a succession of mountains and valleys. By repeated abrasion, those "mountains" are worn down until they are flat or just small "hills". The process of polishing with abrasives starts with a coarse grain size and gradually proceeds to the finer ones to efficiently flatten the surface imperfections and to obtain optimal results.

Mechanical properties

The strength of polished products can be higher than their unpolished counterparts owing to the removal of stress concentrations present in the rough surface during the polishing process. These concentrations take the form of corners and other defects, which magnify the local stress beyond the inherent strength of the material.^[2]

Types

Metal Working

Other polishing processes include:

Burnishing
Mass finishing
- Tumble finishing
- Vibratory finishing
Sodablasting

Woodworking

French polishing
Wood finishing

Other

Chemical-mechanical polishing, which is used in semiconductor fabrication
Fabrication and testing of optical components
Flame polishing, a type of polishing used on glass and thermoplastics
Ultra-fine, abrasive paste polishing, polishing for soft or fragile work surfaces
Vapor polishing, a method of polishing plastics to optical clarity

References

^ Floor Scrubber, archived from the original on 2016-08-31, retrieved 2008-01-04.
^ Zucuni, Camila Pauleski; Dapieve, Kiara Serafini; Rippe, Marília Pivetta; Pereira, Gabriel Kalil Rocha; Bottino, Marco Cícero; Valandro, Luiz Felipe (2019). "Influence of finishing/polishing on the fatigue strength, surface topography, and roughness of an yttrium-stabilized tetragonal zirconia polycrystals subjected to grinding". Journal of the Mechanical Behavior of Biomedical Materials. 93: 222–229. doi:10.1016/j.jmbbm.2019.02.013. PMID 30831358. S2CID 73500578.