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annealing point

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  • Annealing (glass) — Annealing is a process of slowly cooling glass to relieve internal stresses after it was formed. The process may be carried out in a temperature controlled kiln known as a Lehr. [E. F. Collins (1921) Electrically heated glass annealing lehr.… …   Wikipedia

  • Annealing (metallurgy) — Annealing, in metallurgy and materials science, is a heat treatment wherein a material is altered, causing changes in its properties such as strength and hardness. It is a process that produces conditions by heating to above the recrystallization …   Wikipedia

  • Simulated annealing — (SA) is a generic probabilistic meta algorithm for the global optimization problem, namely locating a good approximation to the global optimum of a given function in a large search space. It is often used when the search space is discrete (e.g.,… …   Wikipedia

  • Adaptive simulated annealing — (ASA) is a variant of simulated annealing (SA) algorithm in which the algorithm parameters that control temperature schedule and random step selection are automatically adjusted according to algorithm progress. This makes the algorithm more… …   Wikipedia

  • subcritical annealing — heating to, and holding at, some point below the critical temperature. Subsequent cooling may be in air. This form of heat treatment has a variety of uses depending on the temperature and specification of the steel, its purpose is often to soften …   Mechanics glossary

  • industrial glass — Introduction       solid material that is normally lustrous and transparent in appearance and that shows great durability under exposure to the natural elements. These three properties lustre, transparency, and durability make glass a favoured… …   Universalium

  • Fused quartz — A sphere manufactured by NASA out of fused quartz for use in a gyroscope in the Gravity Probe B experiment. It is one of the most accurate spheres ever created by humans, differing in shape from a perfect sphere by no more than 40 atoms of… …   Wikipedia

  • Characteristics of oxide glasses — ▪ Table Characteristics of oxide glasses fused silica soda lime silica borosilicate aluminosilicate lead Approximate composition1 ● silica 99.9% ● water 0.1% ● silica 73% ● alumina 1% ● sodium oxide 17% ● magnesia 4% ● lime 5% ● silica 81% ●… …   Universalium

  • Glass transition — The liquid glass transition (or glass transition for short) is the reversible transition in amorphous materials (or in amorphous regions within semicrystalline materials) from a hard and relatively brittle state into a molten or rubber like state …   Wikipedia

  • Glass transition temperature — The glass transition temperature, T g, is the temperature at which an amorphous solid, such as glass or a polymer, becomes brittle on cooling, or soft on heating. More specifically, it defines a pseudo second order phase transition in which a… …   Wikipedia

  • Toughened glass — Toughened or tempered glass is glass that has been processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. It will usually shatter into small fragments, rather than sharp shards, when… …   Wikipedia

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