Hans Goldschmidt
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Johannes Wilhelm "Hans" Goldschmidt (18 January 1861 – 21 May 1923) was a German chemist notable as the discoverer of the Thermite reaction. He was also co-owner of the Chemische Fabrik Th. Goldschmidt, as of 1911 Th. Goldschmidt AG (later to become part of Evonik
Industries Industry may refer to: Economics * Industry (economics), a generally categorized branch of economic activity * Industry (manufacturing), a specific branch of economic activity, typically in factories with machinery * The wider industrial secto ...
) and its most important chemis

'' The reaction, also called the Goldschmidt process, is used for Exothermic welding, thermite welding, often used to join railway tracks. Thermites have also been used in metal refining, disabling munitions, and in incendiary weapons. Some thermite-like mixtures are used as
pyrotechnic initiator In pyrotechnics, a pyrotechnic initiator (also initiator or igniter) is a device containing a pyrotechnic composition used primarily to ignite other, more difficult-to-ignite materials, such as thermites, gas generators, and solid-fuel rockets. The ...
s in fireworks. His grave is preserved in the Protestant ''Friedhof I der Jerusalems- und Neuen Kirchengemeinde'' (Cemetery No. I of the congregations of
Jerusalem's Church Jerusalem Church (german: Jerusalem(s)kirche, Jerusalemer Kirche) is one of the churches of the Evangelical Congregation in the Friedrichstadt (under this name since 2001), a member of the Protestant umbrella organisation Evangelical Church of ...
and New Church) in Berlin-Kreuzberg, south of Hallesches Tor.


Biography

He was born in Berlin on 18 January 1861. He was a student of Robert Bunsen. His father, Theodor Goldschmidt, was the founder of the chemical company ''Chemische Fabrik Th. Goldschmidt'' which eventually became part of the modern company Degussa, and Hans and his brother Karl Hering managed this company for many years. He is principally noted as the co-inventor of sodium amalgam and the initial patent holder of the
thermite reaction Thermite () is a pyrotechnic composition of metal powder and metal oxide. When ignited by heat or chemical reaction, thermite undergoes an exothermic reduction-oxidation (redox) reaction. Most varieties are not explosive, but can create brief ...
.'U. S. patent to Hans Goldschmidt, No. 578,868. In this patent the patentee acknowledges that the alumino-thermic reaction was well known and had been used previously for producing metals and alloys.'
/ref> The thermite (or aluminothermic) reaction is one in which aluminium metal is oxidized by an oxide of another metal, usually iron oxide, producing great heat in the process. Goldschmidt was originally interested in producing very pure metals by avoiding the use of carbon in smelting, but he soon realized the value in welding, a process known as
thermic welding Exothermic welding, also known as exothermic bonding, thermite welding (TW), and thermit welding, is a welding process that employs molten metal to permanently join the conductors. The process employs an exothermic reaction of a thermite composit ...
. It is also used in incendiary devices. This process is sometimes called the "Goldschmidt reaction" or "Goldschmidt process", because he furthered its development and patented it in 1895. He also went on to publish an extensive paper on it in 1898.Goldschmidt, H., "Verfahren zur Erzeugung hoher Temperaturen" (Method for the production of high temperatures), ''Zeitschrift für Elektrochemie'', vol. 6, pages 53–57 (1899). He died on 21 May 1923.


Legacy

His grave is preserved in the Protestant ''Friedhof I der Jerusalems- und Neuen Kirchengemeinde'' (Cemetery No. I of the congregations of
Jerusalem's Church Jerusalem Church (german: Jerusalem(s)kirche, Jerusalemer Kirche) is one of the churches of the Evangelical Congregation in the Friedrichstadt (under this name since 2001), a member of the Protestant umbrella organisation Evangelical Church of ...
and New Church) in Berlin-Kreuzberg, south of Hallesches Tor.


See also

* Thermite welding


References


Further reading


''Named Things in Chemical Industry''


External links

* {{DEFAULTSORT:Goldschmidt, Hans 1861 births 1923 deaths 20th-century German chemists Scientists from Berlin Humboldt University of Berlin alumni 19th-century German chemists