Search results
Results from the WOW.Com Content Network
A modern crucible used in the production of silicon ingots via the Czochralski process Smaller clay graphite crucibles for copper alloy melting. A crucible is a container in which metals or other substances may be melted or subjected to very high temperatures.
A Hessian crucible is a type of ceramic crucible that was manufactured in the Hesse region of Germany from the late Middle Ages through the Renaissance period. They were renowned for their ability to withstand very high temperatures, rapid changes in temperature, and strong reagents .
A Gooch crucible, named after Frank Austin Gooch, [1] is a filtration device for laboratory use (and was also called a Gooch filter [2]). It is convenient for collecting a precipitate directly within the vessel in which it is to be dried, possibly ashed , and finally weighed in gravimetric analysis .
Crucible An evaporating dish is a piece of laboratory glassware used for the evaporation of solutions and supernatant liquids, [ a ] and sometimes to their melting point . Evaporating dishes are used to evaporate excess solvents – most commonly water – to produce a concentrated solution or a solid precipitate of the dissolved substance.
A pipeclay triangle is a piece of laboratory apparatus that is used to support a crucible being heated by a Bunsen burner or other heat source. It is made of wires strung in an equilateral triangle on which are strung hollow ceramic, normally fire clay, tubes. The triangle is usually supported on a tripod or iron ring.
When silicon is grown by the Czochralski method, the melt is contained in a silica crucible. During growth, the walls of the crucible dissolve into the melt and Czochralski silicon therefore contains oxygen at a typical concentration of 10 18 cm −3. Oxygen impurities can have beneficial or detrimental effects.
Ceramic BN crucible. Hexagonal BN (h-BN) is the most widely used polymorph. It is a good lubricant at both low and high temperatures (up to 900 °C, even in an oxidizing atmosphere). h-BN lubricant is particularly useful when the electrical conductivity or chemical reactivity of graphite (alternative lubricant) would be problematic.
The shield in the coat of arms of the Royal Society of Chemistry, with the seven planetary-metal symbols. The seven metals known since Classical times in Europe were associated with the seven classical planets; this figured heavily in alchemical symbolism.