Development of Silicon Nitride Turbine Rotors

1985 ◽  
Author(s):  
J. Miyauchi ◽  
Y. Kobayashi
Keyword(s):  
Silicon Nitride ◽  
Turbine Rotors

scholarly journals Testing of Ceramic Rotors: Hot Spin Test Rig and Rotor Preparation

1980 ◽  
Author(s):  
G. C. DeBell ◽  
L. R. Swank
Keyword(s):  
Silicon Nitride ◽  
Gas Turbine ◽  
Ford Motor Company ◽  
Fabrication Process ◽  
Preparation Process ◽  
Test Rig ◽  
Test Program ◽  
Turbine Rotors

A series of duo-density silicon nitride gas turbine rotors have been prepared for testing and tested at Ford Motor Company. The paper reviews the duo-density fabrication process, and covers in detail the rotor preparation process, which includes machining, inspection, and cold proof spinning. The paper describes the hot spin test rig used for the hot testing of the rotors, and summarizes the results of the hot spin test program.

scholarly journals Program Plan for the Design and Spin Test of Ceramic Blade-Metal Disk Attachments

1976 ◽  
Author(s):  
G. S. Calvert
Keyword(s):  
Silicon Nitride ◽  
Metal Disk ◽  
Program Plan ◽  
Turbine Rotors ◽  
A Current

A current NASA-sponsored contract will develop attachment technology for hybrid turbine rotors having dovetailed ceramic ceramic blades and a wrought metal disk. The approach and sequence of activities are described in detail. The program scope includes design, fabrication, and spin testing of hot-pressed silicon nitride blades for operation at rotor inlet temperatures of 2192 F (1200 C) or greater.

scholarly journals Development of Silicon Nitride Rotors for Gas Turbine Applications

1994 ◽  
Author(s):  
Makoto Yoshida ◽  
Sazo Tsuruzono ◽  
Takashi Ono ◽  
Hiroshi Gejima
Keyword(s):  
Silicon Nitride ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Room Temperature ◽  
Slip Casting ◽  
Development Programs ◽  
Different Types ◽  
Computer Analyses ◽  
Turbine Rotors ◽  
The Government

Kyocera is developing various ceramic parts for gas turbines under the government funded ceramic gas turbine development programs in Japan. Among the programs, Kyocera is contracted for the development components for CGT-302 and CGT-303 engines which are designed for 300kW output power generation. Of the various parts for gas turbines, we discuss developments and burst tests at room temperature of silicon nitride turbine rotors made by slip casting. In particular, the result of burst tests of turbine rotors at room temperature is evaluated along with the strength prediction by a computer program (CARES) developed by NASA. Different types of turbine rotors were tested, and their burst speeds were well correlated to the strength predicted by computer analyses. This suggests that fracture stress of ceramic parts is well predicted from the material data.

Development of Silicon Nitride Radial Turbine Rotors

1992 ◽  
pp. 1009-1016 ◽  
Author(s):  
Keiichiro Watanabe ◽  
Tadao Ozawa ◽  
Yoshito Kobayashi ◽  
Eito Matsuo
Keyword(s):  
Silicon Nitride ◽  
Radial Turbine ◽  
Turbine Rotors

scholarly journals Development in Injection Molding Silicon Nitride Turbine Components

1990 ◽  
Author(s):  
J. Neil ◽  
G. Bandyopadhyay ◽  
D. Sordelet ◽  
M. Mahoney
Keyword(s):  
Mechanical Property ◽  
Silicon Nitride ◽  
Injection Molding ◽  
Technology Development ◽  
Axial Turbine ◽  
Technology Applications ◽  
Near Net Shape ◽  
Turbine Rotors ◽  
Current Emphasis

The use of injection molding technology for the fabrication of near-net-shape silicon nitride turbine components has been demonstrated in a number of rotor and blade configurations. The current emphasis at GTE Laboratories is to refine the process, bringing it to a level of durability and reproducibility sufficient for production needs. Progress in injection molding technology development will be described with emphasis on the flow and mechanical property requirements for forming flaw-free green components. Application of the findings to the fabrication of AGT-5 axial turbine rotors and vanes under the DOE sponsored Advanced Turbine Technology Applications Project will be reviewed.

scholarly journals Development of Ceramic Turbine Rotors and Nozzles for the 100kW Automotive Ceramic Gas Turbine Program

1996 ◽  
Author(s):  
Satoru Yamada ◽  
Keiichiro Watanabe ◽  
Massaki Masuda
Keyword(s):  
Silicon Nitride ◽  
Gas Turbine ◽  
Development Program ◽  
Dimensional Accuracy ◽  
Turbine Rotor ◽  
Ceramic Components ◽  
Energy Center ◽  
Turbine Rotors

NGK Insulators, Ltd. (NGK) fabricates ceramic turbine rotors and nozzle components for the Automotive Ceramic Gas Turbine development program (CGT program), conducted by the Petroleum Energy Center (PEC) of Japan. Both the rotor and nozzle components are made of silicon nitride. The turbine rotor is a radial type having a 127 mm tip diameter, and the segment type nozzle is formed integrally with either three or four vanes and shrouds. This paper discusses various processes of fabricating the ceramic components, dependence of the fabrication processes on dimensional accuracy, and the performance of each of the processes.

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

TEM Studies of Grain Boundary Films in Si3N4 Ceramics

1991 ◽  
Vol 49 ◽  
pp. 930-931
Author(s):  
H.-J. Kleebe ◽  
J.S. Vetrano ◽  
J. Bruley ◽  
M. Rühle
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Hot Isostatic Pressing ◽  
Amorphous Film ◽  
Liquid Phase Sintering ◽  
Second Phase ◽  
High Temperature Mechanical Properties ◽  
Triple Points ◽  
Boundary Films

It is expected that silicon nitride based ceramics will be used as high-temperature structural components. Though much progress has been made in both processing techniques and microstructural control, the mechanical properties required have not yet been achieved. It is thought that the high-temperature mechanical properties of Si3N4 are limited largely by the secondary glassy phases present at triple points. These are due to various oxide additives used to promote liquid-phase sintering. Therefore, many attempts have been performed to crystallize these second phase glassy pockets in order to improve high temperature properties. In addition to the glassy or crystallized second phases at triple points a thin amorphous film exists at two-grain junctions. This thin film is found even in silicon nitride formed by hot isostatic pressing (HIPing) without additives. It has been proposed by Clarke that an amorphous film can exist at two-grain junctions with an equilibrium thickness.

Electron Microscopy of Silicon Nitride-Based Ceramics

1991 ◽  
Vol 49 ◽  
pp. 926-927
Author(s):  
Gareth Thomas
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Silicon Nitride ◽  
World Wide ◽  
Sintering Temperature ◽  
Liquid Phase Sintering ◽  
High Temperature Strength ◽  
Sintering Additives ◽  
Glass Forming ◽  
Dense Product

Silicon nitride and silicon nitride based-ceramics are now well known for their potential as hightemperature structural materials, e.g. in engines. However, as is the case for many ceramics, in order to produce a dense product, sintering additives are utilized which allow liquid-phase sintering to occur; but upon cooling from the sintering temperature residual intergranular phases are formed which can be deleterious to high-temperature strength and oxidation resistance, especially if these phases are nonviscous glasses. Many oxide sintering additives have been utilized in processing attempts world-wide to produce dense creep resistant components using Si3N4 but the problem of controlling intergranular phases requires an understanding of the glass forming and subsequent glass-crystalline transformations that can occur at the grain boundaries.

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