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Neuartige Versuche zur Diamant-Synthese

Neuartige Versuche zur Diamant-Synthese

          
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About the Book

Inhaltsangabe: Einleitung: Seit vielen tausend Jahren fasziniert der Diamant die Menschen, insbesondere wegen seiner enormen Härte und des extrem hohen Brechungsindexes. In guter Qualität ist der als Schmuckstein gehandelte Diamant eines der teuersten Materialien überhaupt. Im letzten Jahrhundert gewann die technische Nutzung von billigerem, für Schmuck ungeeignetem Diamant für Schneidwerkzeuge, Schleif- und Poliermittel zunehmend an Bedeutung. Seit bekannt ist, daß der Diamant aus Kohlenstoff besteht, werden sehr viele Versuche unternommen, ihn möglichst billig und in guter Qualität herzustellen. Erst in der zweiten Hälfte des 20. Jahrhunderts konnte man industriell relevante Diamantsynthese-Verfahren entwickeln, bei denen man sehr hohe Drucke und hohe Temperaturen auf Graphit einwirken ließ. Diese ersten synthetischen Diamanten hatten zwar keine Schmucksteinqualität, konnten aber für technische Anwendungen, die auf der Härte basieren, gehandelt werden. Die Hochdrucksynthesen wurden im Lauf der Zeit so stark verbessert, daß es heute bereits möglich ist, Diamanten mit einer Größe von mehr als fünf Millimetern herzustellen. Zusätzlich entwickelte man einen völlig neuen Syntheseweg, die sogenannte CVD-Synthese von Diamant. Sie begann sich erst ab 1982 durchzusetzen. Dabei steht „CVD" für „Chemical Vapor Deposition". Bei dieser Synthese-Form macht man sich die chemische Reaktion von kohlenstoffhaltigen Teilchen in einer stark angeregten Gasphase zu Nutze, bei der Kohlenstoff als Diamantschicht auf einem Substrat abgeschieden wird. Die Anregung der Gasphase erfolgt auf sehr unterschiedlichen Wegen, z.B. durch einen heißen Draht oder durch Mikrowellen-Bestrahlung. Die Beschichtung von Gegenständen mit Diamant hat ein sehr großes Anwendungspotential, z.B. wärmeleitende Beschichtungen für Elektronikbauteile, harte Schichten auf Bohrern, kratzfeste Gläser und vieles mehr. Dementsprechend hat die CVD-Synthese von Diamant sehr schnell eine große kommerzielle Bedeutung erlan


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Product Details
  • ISBN-13: 9783838617954
  • Publisher: Diplom.de
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Spine Width: 5 mm
  • Width: 148 mm
  • ISBN-10: 3838617959
  • Publisher Date: 22 Sep 1999
  • Height: 210 mm
  • No of Pages: 76
  • Series Title: German
  • Weight: 113 gr


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