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- Annealing_(glass) abstract "Annealing is a process of slowly cooling hot glass to relieve internal stresses after it was formed. The process may be carried out in a temperature-controlled kiln known as a lehr. Glass which has not been annealed is liable to crack or shatter when subjected to a relatively small temperature change or mechanical shock. Annealing glass is critical to its durability. If glass is not annealed, it will retain many of the thermal stresses caused by quenching and significantly decrease the overall strength of the glass.The glass is heated until the temperature reaches a stress-relief point, that is, the annealing temperature (also called annealing point) at a viscosity, η, of 1013 Poise = 1012 Pa·s, at which the glass is still too hard to deform, but is soft enough for the stresses to relax. The piece is then allowed to heat-soak until its temperature is even throughout. The time necessary for this step varies depending on the type of glass and its maximum thickness. The glass is then slowly cooled at a predetermined rate until its temperature is below the strain point (η = 1014.5 Poise). Following this, the temperature can safely be dropped to room temperature at a rate limited by the heat capacity, thickness, thermal conductivity, and thermal expansion coefficient of the glass. After the annealing process the material can be cut to size, drilled or polished. At the annealing point (η = 1013 Poise) stresses relax within several minutes, while at the strain point (η = 1014.5 Poise) stresses relax within several hours. Stresses acquired during and remaining from temperatures above the strain point are permanent unless annealed and may lead to short-term or much delayed failures. Stresses acquired during cooling below the strain point are considered temporary though may be adequate to cause short-term failure.".
- Annealing_(glass) wikiPageID "3424429".
- Annealing_(glass) wikiPageLength "3085".
- Annealing_(glass) wikiPageOutDegree "23".
- Annealing_(glass) wikiPageRevisionID "668051325".
- Annealing_(glass) wikiPageWikiLink Annealing_(metallurgy).
- Annealing_(glass) wikiPageWikiLink Bologna_bottle.
- Annealing_(glass) wikiPageWikiLink Category:Glass_engineering_and_science.
- Annealing_(glass) wikiPageWikiLink Category:Industrial_processes.
- Annealing_(glass) wikiPageWikiLink Category:Warm_glass.
- Annealing_(glass) wikiPageWikiLink Deformation_(engineering).
- Annealing_(glass) wikiPageWikiLink Fabrication_and_testing_(optical_components).
- Annealing_(glass) wikiPageWikiLink Fabrication_and_testing_of_optical_components.
- Annealing_(glass) wikiPageWikiLink Float_glass.
- Annealing_(glass) wikiPageWikiLink Glass.
- Annealing_(glass) wikiPageWikiLink Heat_capacity.
- Annealing_(glass) wikiPageWikiLink Kiln.
- Annealing_(glass) wikiPageWikiLink Lehr_(glassmaking).
- Annealing_(glass) wikiPageWikiLink Poise.
- Annealing_(glass) wikiPageWikiLink Quenching.
- Annealing_(glass) wikiPageWikiLink Room_temperature.
- Annealing_(glass) wikiPageWikiLink Stress_(mechanics).
- Annealing_(glass) wikiPageWikiLink Stress_(physics).
- Annealing_(glass) wikiPageWikiLink Temperature.
- Annealing_(glass) wikiPageWikiLink Tempered_glass.
- Annealing_(glass) wikiPageWikiLink Thermal_conductivity.
- Annealing_(glass) wikiPageWikiLink Thermal_expansion.
- Annealing_(glass) wikiPageWikiLink Thermal_expansion_coefficient.
- Annealing_(glass) wikiPageWikiLink Toughened_glass.
- Annealing_(glass) wikiPageWikiLink Viscosity.
- Annealing_(glass) wikiPageWikiLink Viscous_liquid.
- Annealing_(glass) wikiPageWikiLink Warm_glass.
- Annealing_(glass) wikiPageWikiLinkText "Annealed glass".
- Annealing_(glass) wikiPageWikiLinkText "Annealing (glass)".
- Annealing_(glass) wikiPageWikiLinkText "Annealing point".
- Annealing_(glass) wikiPageWikiLinkText "Annealing".
- Annealing_(glass) wikiPageWikiLinkText "Strain point".
- Annealing_(glass) wikiPageWikiLinkText "anneal".
- Annealing_(glass) wikiPageWikiLinkText "annealed glass".
- Annealing_(glass) wikiPageWikiLinkText "annealed".
- Annealing_(glass) wikiPageWikiLinkText "annealer".
- Annealing_(glass) wikiPageWikiLinkText "annealing (glass)".
- Annealing_(glass) wikiPageWikiLinkText "annealing point".
- Annealing_(glass) wikiPageWikiLinkText "annealing".
- Annealing_(glass) wikiPageWikiLinkText "anneals".
- Annealing_(glass) wikiPageWikiLinkText "gradual cooling".
- Annealing_(glass) wikiPageWikiLinkText "slow cooling".
- Annealing_(glass) wikiPageWikiLinkText "strain point".
- Annealing_(glass) hasPhotoCollection Annealing_(glass).
- Annealing_(glass) wikiPageUsesTemplate Template:Cite_web.
- Annealing_(glass) wikiPageUsesTemplate Template:Glass-engineering-stub.
- Annealing_(glass) wikiPageUsesTemplate Template:Glass_science.
- Annealing_(glass) wikiPageUsesTemplate Template:Merge.
- Annealing_(glass) wikiPageUsesTemplate Template:Reflist.
- Annealing_(glass) subject Category:Glass_engineering_and_science.
- Annealing_(glass) subject Category:Industrial_processes.
- Annealing_(glass) subject Category:Warm_glass.
- Annealing_(glass) hypernym Process.
- Annealing_(glass) type Election.
- Annealing_(glass) comment "Annealing is a process of slowly cooling hot glass to relieve internal stresses after it was formed. The process may be carried out in a temperature-controlled kiln known as a lehr. Glass which has not been annealed is liable to crack or shatter when subjected to a relatively small temperature change or mechanical shock. Annealing glass is critical to its durability.".
- Annealing_(glass) label "Annealing (glass)".
- Annealing_(glass) sameAs m.09br_j.
- Annealing_(glass) sameAs Отжиг_стекла.
- Annealing_(glass) sameAs Q4339544.
- Annealing_(glass) sameAs Q4339544.
- Annealing_(glass) wasDerivedFrom Annealing_(glass)?oldid=668051325.
- Annealing_(glass) isPrimaryTopicOf Annealing_(glass).