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A calcium–aluminium-rich inclusion or Ca–Al-rich inclusion (CAI) is a submillimeter- to centimeter-sized light-colored calcium- and aluminium-rich inclusion found in carbonaceous chondrite meteorites. The four CAIs that have been dated using the Pb-Pb chronometer yield a weighted mean age of 4567.30 ± 0.16 Myr.
The following inclusion types can also be found in aluminium alloys: alumina needles (Al 2 O 3), nitrides (AlN), iron oxides (FeO), manganese oxides (MnO), fluorides (Na 3 AlF 6, NaF, CaF 2, …), aluminium borides (AlB 2, AlB 12), borocarbides (Al 4 C 4 B). Bone ash (Ca 3 (PO 4) 2) sometimes added to patch cracks in the trough can be found as ...
oxides (simple — FeO, MnO, Cr 2 O 3, SiO 2, Al 2 O 3, TiO 2 and others; compound — FeO·Fe 2 O 3, FeO·Al 2 O 3, FeO·Cr 2 O 3, MgO·Al 2 O 3, 2FeO·SiO 2 and others; The majority of inclusions in metals are oxides and sulfides since the content of phosphorus is very small. Silicates are very detrimental to steels, especially if it has to ...
A typical composition [4] is Ca 0.93 Al 1.94 Fe 0.11 Si 0.02 O 4. It reacts rapidly with water, forming the metastable hydrate CaO·Al 2 O 3 ·10H 2 O, or a mixture of 2CaO·Al 2 O 3 ·8H 2 O, 3CaO·Al 2 O 3 ·6H 2 O and Al(OH) 3 gel. These reactions form the first stage of strength development in calcium aluminate cements.
Date/Time Thumbnail Dimensions User Comment; current: 17:49, 9 August 2011: 1,250 × 1,666, 19 pages (294 KB): Ldavis (Public Policy) Updates based on Campus Ambassador feedback.
Al-Ca composite is a high-conductivity, high-strength, lightweight composite consisting of sub-micron-diameter pure calcium metal filaments embedded inside a pure aluminium metal matrix. The material is still in the development phase, but it has potential use as an overhead high-voltage power transmission conductor . [ 1 ]
The upper end is related to the stringent requirements of choosing keys used in encryption. In 1999, an Electronic Frontier Foundation project broke 56-bit DES encryption in less than a day using specially designed hardware. [21] In 2002, distributed.net cracked a 64-bit key in 4 years, 9 months, and 23 days. [22]
In mineralogy, an inclusion is any material trapped inside a mineral during its formation. In gemology , it is an object enclosed within a gemstone or reaching its surface from the interior. [ 1 ] According to James Hutton 's law of inclusions, fragments included in a host rock are older than the host rock itself.