Aluminium magnesium boride

Aluminum magnesium boride or BAM is a chemical compound of aluminium, magnesium and boron. Whereas its nominal formula is AlMgB₁₄, the chemical composition is closer to Al_0.75Mg_0.75B₁₄. It is a ceramic alloy that is highly resistive to wear and has a low coefficient of sliding friction, reaching a record value of 0.02 in lubricated AlMgB₁₄−TiB₂ composites. First reported in 1970, BAM has an orthorhombic structure with four icosahedral B₁₂ units per unit cell. This ultrahard material has a coefficient of thermal expansion comparable to that of other widely used materials such as steel and concrete.

Synthesis

BAM powders are produced by heating a nearly stoichiometric mixture of boron, aluminium and magnesium for a few hours at a temperature in the range 900–1500 °C. Spurious phases are then dissolved in hot hydrochloric acid. To ease the reaction and make the product more homogeneous, the starting mixture can be processed in a high-energy ball mill. All pretreatments are carried out in a dry, inert atmosphere to avoid oxidation of the metal powders.

Material

Material is a broad term for the (chemical) substance, or a mixture of substances that constitute a thing. See:-

Material may also refer to:

Glossary of chess

This page explains commonly used terms in chess in alphabetical order. Some of these have their own pages, like fork and pin. For a list of unorthodox chess pieces, see Fairy chess piece; for a list of terms specific to chess problems, see Glossary of chess problems; for a list of chess-related games, see Chess variants.

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[adjective: prophylactic] Prophylactic techniques include the blockade, overprotection, and the mysterious rook move.

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Material (film)

Material is a 2012 South African film, directed by Craig Freimond and written by Craig Freimond, Ronnie Apteker, Robbie Thorpe, Rosalind Butler and Riaad Moosa. After playing at Film Africa 2012, it has been shown at numerous film festivals around the world (London, International Film Festival of India, Busan) and gained a reputation as one of the best original South African films and a significant leap forward for the country's film industry. Its portrayal of the lives of Muslims in South Africa was seen as an honest attempt to tackle some of the social issues facing the country's multiracial society.

Plot

Set in the Muslim Indian enclave of Fordsburg, Johannesburg. Material revolves around the tempestuous relationship between Cassim Kaif and his aging father whose one dream is for his son to take over the family’s fabric shop, which is struggling to stay afloat. However, Cassim wants to be a stand-up comedian, a notion that his traditionalist father strongly disproves of. When Cassim lands a gig at a local bar, he has to find a way of keeping it a secret from his family. The film's portrayal of the clash between youth, tradition and religion, alternates between heart-wrenching family drama and hilarious snippets from the world of stand-up comedy.

Bam

Bam or BAM may refer to:

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Bam (nickname)

Bam is a nickname for:

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Bam Province

Bam is one of the 45 provinces of Burkina Faso. It is in Centre-Nord Region and the capital of Bam is Kongoussi. In 2006 it had a population of 277092. It is a rural province with 252,509 of its residents living in the countryside; only 24,583 live in urban areas. There are 132,086 men living in Bam Province and 145,006 women.

Bam is divided into 9 departments:

Twin towns

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References

Coordinates: 13°19′32″N 1°31′40″W / 13.32556°N 1.52778°W / 13.32556; -1.52778