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Processing of Sintered Alpha SiC FREE

[+] Author Affiliations
Roger S. Storm

Carborundum Company, Niagara Falls, NY

Paper No. 84-GT-127, pp. V005T12A003; 13 pages
doi:10.1115/84-GT-127
From:
  • ASME 1984 International Gas Turbine Conference and Exhibit
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; Process Industries; Technology Resources
  • Amsterdam, The Netherlands, June 4–7, 1984
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7950-4
  • Copyright © 1984 by ASME

abstract

The Carborundum Company has been involved in the manufacture of alpha SiC for close to 100 years. The historical usage of this material has been as a coarse grain for the abrasive industry. Several Carborundum manufacturing plants are in existence worldwide and each has a capacity of approximately 40,000 tons/year of SiC powder produced by the Acheson process in which a graphite electrode is encased in a mixture of sand (SiO2) and coke. After the mass is heated to 4000°C and allowed to cool, the crystalline SiC grain is obtained directly (Figure 1). A milling and classification procedure is then employed to produce the desired grain sizes.

In 1975, researchers at Carborundum discovered a process for making high density, high strength monolithic shapes of alpha SiC(1). This involved using a submicron sized powder blended with sintering aids (boron and carbon). The mixture is green compacted and heated to above 2000°C under inert gas at atmospheric pressure. A solid state grain boundary diffusion process results in a densification process with an accompanying linear shrinkage of approximately 18%, to produce a body with 95–99% of theoretical density (3.21 gm/cc), and properties which are of interest for engineering applications. The pressureless sintering allows the formation of complex geometries by a net shape process without grinding, thus, creating the potential for the economical production of precision components in high volume.

Copyright © 1984 by ASME
This article is only available in the PDF format.

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