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Fabrication and Testing of Ceramic Turbine Wheels PUBLIC ACCESS

[+] Author Affiliations
K. Takatori, T. Honma, N. Kamiya, H. Masaki, S. Wada

Toyota Central R & D Labs. Inc., Nagakute, Aichi, Japan

S. Sasaki

Toyota Motor Corporation, Susono, Shizuoka, Japan

Paper No. 91-GT-142, pp. V005T13A009; 7 pages
doi:10.1115/91-GT-142
From:
  • ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General
  • Orlando, Florida, USA, June 3–6, 1991
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7902-3
  • Copyright © 1991 by ASME

abstract

Silicon nitride (Si3N4) radial inflow turbine wheels were fabricated by injection molding at Toyota Central R & D Labs. The wheel was 142mm in outer diameter and had 14 blades. The radial wheel was too bulky to manufacture as a homogeneous and defect-free body in one piece. It was divided into two pieces for injection molding and put together into one body by a cold isostatic pressing step after binder removal. Spin testing was executed at room temperature and the resulting photographs taken from three directions provided useful information about the fracture mode of the wheels. The maximum burst speed of the wheels at room temperature was 98,900 rpm, which corresponded to 145% of the design speed. In a hot rig test, one of the wheels survived 75,000rpm for ten minutes at a turbine inlet temperature of 1,050°C.

Copyright © 1991 by ASME
This article is only available in the PDF format.

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