Microwave and Millimeter wave Processing of Polymer-Derived Silicon Nitride

1996 ◽  
Vol 430 ◽  
Author(s):  
S. T. Schwab ◽  
S. F. Timmons ◽  
C. R. Blanchard ◽  
M. D. Grimes ◽  
R. C. Graef ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Millimeter Wave ◽  
Powder Processing ◽  
Cost Savings ◽  
Fiber Reinforced ◽  
Chemical Methods ◽  
Southwest Research Institute ◽  
Wave Heating ◽  
Polymer Infiltration ◽  
Matrix Precursor

AbstractChemical methods of processing ceramics have the potential to overcome many of the processing-related obstacles that have hindered widespread commercialization. The Southwest Research Institute (SwRI) has focused on the development of polymeric precursors to silicon nitride (Si3N4). One such precursor, perhydropolysilazane (or PHPS), has been shown to be a useful binder for Si3N4 powder processing, a useful matrix precursor for the polymer infiltration/pyrolysis (PIP) processing of fiber-reinforced Si3N4, and a useful ceramic coating precursor for the repair of oxidation protection coatings on carbon-carbon composites. While conventional, thermal pyrolyses of these preceramnics has been sufficient to demonstrate their potential, substantial cost savings could be realized if the polymer-to-ceramic conversion could be instigated with electromagnetic energy. We have investigated the use of millimeter wave heating as a means of converting PHPS into Si3N4, and report here the results of our efforts to produce bulk compacts, coatings, and fiber-reinforced ceramics.

Pip Processing, Microstructure and Properties of Si34N Fiber and Al2O3 Fiber Reinforced Silicon Nitride

1994 ◽  
Vol 365 ◽  
Author(s):  
Stuart T. Schwab ◽  
Richard A. Page ◽  
David L. Davidson ◽  
Renee C. Graef
Keyword(s):  
High Temperature ◽  
Silicon Nitride ◽  
Carbon Composite ◽  
Organic Polymer ◽  
High Temperature Strength ◽  
Fiber Reinforced ◽  
Southwest Research Institute ◽  
Structural Applications ◽  
Al2o3 Fiber ◽  
Manufacturing Techniques

ABSTRACTPolymer infiltration/pyrolysis (PIP) processing has the potential to become an affordable means of manufacturing continuous fiber-reinforced ceramic-matrix components. The PIP method is very similar to the well-known polymer-matrix and carbon-carbon composite manufacturing techniques, the major difference being the use of a preceramic polymer in place of the organic polymer or carbon precursor. To date, the majority of research in the field of preceramic polymers has centered on precursors to silicon carbide (SiC). The Southwest Research Institute (SwRI) has focused on the development of polymeric precursors to silicon nitride (Si3N4) because its high-temperature strength, resistance to oxidation, and other properties make it an attractive candidate for many advanced high-temperature structural applications. PIP Si3N4 composites with NICALON SiC fiber reinforcement have exhibited good fracture toughness (KIC ∼ 16MPa·m1/ 2). We report here processing, microstructure and preliminary mechanical properties of two new PIP Si3N4 composites. One is reinforced with Tonen Si3N4 fiber (plain weave) while the other is reinforced with ALMAX Al2O3 fiber (8 Harness satin weave).

Infiltration/Pyrolysis Processing of Fiber-Reinforced Silicon Nitride

1992 ◽  
Vol 287 ◽  
Author(s):  
Stuart T. Schwab ◽  
Renee C. Graef ◽  
Cheryl R. Blanchard ◽  
Yi-Ming Pan ◽  
David L. Davidson
Keyword(s):  
Silicon Nitride ◽  
Brittle Failure ◽  
High Temperature Strength ◽  
Fiber Reinforced ◽  
Southwest Research Institute ◽  
Resistance To Oxidation ◽  
Structural Applications ◽  
Complex Shapes ◽  
Near Net Shape ◽  
Manufacturing Techniques

ABSTRACTWhile its high-temperature strength, resistance to oxidation, and other properties make silicon nitride an attractive candidate for many advanced structural applications, its propensity for brittle failure has hindered its widespread adoption. One approach to avoiding brittle failure is through incorporation of continuous fiber-reinforcement; however, conventional (powderbased) methods of silicon nitride fabrication can degrade fibers and are not amenable to the production of complex shapes. The Southwest Research Institute has developed a number of polymeric precursors to silicon nitride which are available as thermosetting liquids, and we have shown that these materials can be used in combination with near net-shape manufacturing techniques to produce fiber-reinforced silicon nitride composites. Mechanical property tests conducted at room temperature suggest that these polymer-derived composites exhibit fracture behavior comparable to those produced through conventional techniques; micromechanical investigations conducted at 800°C indicate that non-brittle failure is maintained at elevated temperature.

MECHANICAL EVALUATION FOR SILICON NITRIDE SINTERED BY 28GHz MILLIMETER-WAVE HEATING

2005 ◽  
pp. 169-172
Author(s):  
Hidenori Saito ◽  
Toshiyuki Ueno ◽  
Saburo Sano ◽  
Yukio Makino ◽  
Shoji Miyake
Keyword(s):  
Silicon Nitride ◽  
Millimeter Wave ◽  
Wave Heating

TEM Investigations on Three-Dimensional Silica Fiber Reinforced Silicon Nitride Composites

2012 ◽  
Vol 562-564 ◽  
pp. 431-434 ◽  
Author(s):  
Gong Jin Qi
Keyword(s):  
Electron Microscopy ◽  
Silicon Nitride ◽  
Interfacial Adhesion ◽  
Three Dimensional ◽  
Silica Fiber ◽  
Fiber Reinforced ◽  
Pyrolysis Method ◽  
Transmission Electron ◽  
Fiber Matrix ◽  
Polymer Infiltration

Three-dimensional silica fiber reinforced silicon nitride composites were prepared by polymer infiltration and pyrolysis method using perhydropolysilazane (PHPS) and polyhydridomethylsilazane (PHMS), respectively. The microstructures of the composites were characterized by transmission electron microscopy. Strong fiber/matrix interfacial adhesion was observed for the PHPS-derived composites prepared at 1073K, and the PHMS-derived composites prepared at 873K without fiber precoating. While for the PHMS-derived composites prepared at 873K with fiber precoating, the coating changed the fiber/matrix interfacial bonding conditions, leading to high mechanical properties.

234 Mechanical properties of silicon nitride ceramics sintered by 28GHz millimeter-wave heating method

2001 ◽  
Vol 2001 (0) ◽  
pp. 183-184
Author(s):  
Hidenori SAITO ◽  
Toshiyuki UENO ◽  
Saburo SANO ◽  
Yukio MAKINO ◽  
Shoji MIYAKE
Keyword(s):  
Mechanical Properties ◽  
Silicon Nitride ◽  
Millimeter Wave ◽  
Heating Method ◽  
Wave Heating ◽  
Nitride Ceramics

High temperature hardness of silicon nitride ceramics sintered by 28GHz millimeter-wave heating method

2002 ◽  
Vol 2002 (0) ◽  
pp. 169-170
Author(s):  
Hidenori SAITO ◽  
Toshiyuki UENO ◽  
Saburo SANO ◽  
Yukio MAKINO ◽  
Shoji MIYAKE
Keyword(s):  
High Temperature ◽  
Silicon Nitride ◽  
Millimeter Wave ◽  
Heating Method ◽  
Wave Heating ◽  
Nitride Ceramics

scholarly journals Development of New Aids Based on Yb2O3-Al2O3 for Sintering of Silicon Nitride in 28GHz Millimeter-Wave Heating.

2001 ◽  
Vol 48 (6) ◽  
pp. 551-557 ◽  
Author(s):  
Toshiyuki Ueno ◽  
Yukio Makino ◽  
Shoji Miyake ◽  
Saburo Sano ◽  
Hidenori Saito
Keyword(s):  
Silicon Nitride ◽  
Millimeter Wave ◽  
Wave Heating
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