Static Fatigue Resistance of Hot Pressed Silicon Nitride

1986 ◽  
pp. 319-332 ◽  
Author(s):  
George D. Quinn
Keyword(s):  
Silicon Nitride ◽  
Fatigue Resistance ◽  
Static Fatigue

Static fatigue resistance of Si3N4 + Si3N4 whisker ceramics at 1200°C

1994 ◽  
Vol 13 (2) ◽  
pp. 131-134 ◽  
Author(s):  
J. Dusza ◽  
P. Šajgalík
Keyword(s):  
Fatigue Resistance ◽  
Static Fatigue ◽  
Si3n4 Whisker

ChemInform Abstract: STATIC FATIGUE OF SILICON NITRIDE (SI3N4)

1978 ◽  
Vol 9 (33) ◽  
Author(s):  
K. JAKUS ◽  
J. E. JUN. RITTER
Keyword(s):  
Silicon Nitride ◽  
Static Fatigue

Apparent Enhanced Fatigue Resistance under Cyclic Tensile Loading for a HIPed Silicon Nitride

1993 ◽  
Vol 76 (3) ◽  
pp. 788-792 ◽  
Author(s):  
Michael G. Jenkins ◽  
Mattison K. Ferber ◽  
Chih-Kuang J. Lin
Keyword(s):  
Silicon Nitride ◽  
Fatigue Resistance ◽  
Tensile Loading

Microvoid formation in the grain boundary phase of a sintered Si-Al-O-N ceramic after static fatigue testing

1986 ◽  
Vol 44 ◽  
pp. 490-491
Author(s):  
M. R. Hughes ◽  
T. A. Nolan ◽  
J. Chang
Keyword(s):  
Silicon Nitride ◽  
Elevated Temperatures ◽  
Fatigue Testing ◽  
Slow Crack Growth ◽  
Boundary Phase ◽  
Turbine Engines ◽  
Static Fatigue ◽  
Gas Turbine Engines ◽  
Sintering Aid ◽  
Intergranular Phase

Sintered silicon nitride materials are currently being considered for use in hot flow-path components of gas turbine engines because of their good thermal shock and oxidation resistance as well as strength at high temperatures. These materials, however, have been shown to be susceptible to slow crack growth (SCG) and creep at elevated temperatures. The high-temperature properties are largely determined by the intergranular phase which is composed of the sintering aid residue and may be either amorphous or crystalline depending on sintering and annealing parameters. The silicon nitride examined in this study had reportedly been sintered with Y2O3 (5.86%) and Al2O3 (2.2%) to produce a composite of β'Si3N4 crystals in an amorphous Y-Si-Al-O-N matrix. Static fatique tests performed on test bars of this material resulted in failures originating, via SCG and creep within the intergranular phase, above certain stress loads at 1000°C. These sites and other areas through the cross section of the test bars were examined by SEM and AEM to determine the microstructure and chemistry related to these failure phenomena.

Static Fatigue of Preoxidized Hot-Pressed Silicon Nitride

1983 ◽  
Vol 66 (2) ◽  
pp. C-31-C-32 ◽  
Author(s):  
George D. Quinn ◽  
Lewis Swank
Keyword(s):  
Silicon Nitride ◽  
Static Fatigue

scholarly journals Fatigue resistance of endodontic instruments manufactured in NiTi CM Wire and in conventional NiTi alloy with eletrochemical treatment

2018 ◽  
Vol 66 (2) ◽  
pp. 111-116
Author(s):  
Inês de Fátima de Azevedo Jacinto INOJOSA ◽  
Hélio Pereira LOPES ◽  
Phillip Lucas Ricardo PEREIRA ◽  
Diogo Lopes do NASCIMENTO ◽  
Carlos Nelson ELIAS ◽  
...  
Keyword(s):  
Cross Section ◽  
Fatigue Resistance ◽  
Manufacturing Process ◽  
Fracture Resistance ◽  
Niti Alloy ◽  
Fatigue Behavior ◽  
Morphological Characteristics ◽  
Static Fatigue ◽  
Number Of Cycles ◽  
Fractured Surface

ABSTRACT Objective: This study compared the fatigue behavior of endodontic instruments manufactured with conventional NiTi alloy electropolishing, RaCe (FKG Dentaire, LaChauxdeFonds, Switzerland), with instruments manufactured with NiTi CM Wire subjected to thermomechanical treatment, in the manufacturing process, HyFlex CM (Coltène Whaledent, Cuyahoga Falls, Ohio, USA), both with similar geometry and dimensions in order to determine the influence of the manufacturing process in the fatigue resistance. Methods: The methodoly consisted of twenty HyFlex CM and RaCe instruments with D0 0.25 mm, taper 0.06 mm / mm, 25 mm length, both with triangular cross section. The fracture resistance was evaluated by static fatigue test, using a stainless artificial canal with 5mm of radius (86°), recording the time and calculating the number of cycles until fracture occurs (NCF). For statistical analysis the Student t test was used The fractured instruments surface was analyzed by SEM. Results: The NCF was significantly higher for HyFlex CM instruments in comparison with RaCe files (P˂0.05) being 1336% more resistant to fatigue. The analysis of the fractured surface by SEM showed ductile-kind morphological characteristics for both instruments and the absence of plastic deformation. Conclusion: HyFlex CM instruments present higher values of NCF. Thus, it can be concluded that the thermal treatment to which these instruments with CM Wire alloy are submitted makes them more resistant to fracture than Race instruments manufactured with conventional NiTi alloy electropolishing.

High Temperature Fatigue Properties of Silicon Nitride in Nitrogen Atmosphere

1992 ◽  
Vol 287 ◽  
Author(s):  
Yasuhiro Shigegaki ◽  
Takashi Inamura ◽  
Akihiko Suzuki ◽  
Tadashi Sasa
Keyword(s):  
Silicon Nitride ◽  
Fatigue Behavior ◽  
Cyclic Fatigue ◽  
Nitrogen Atmosphere ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Static Fatigue ◽  
Four Point Bending ◽  
Bending Mode ◽  
Sintered Silicon

ABSTRACTCyclic and static fatigue properties of pressure-less sintered silicon nitride were evaluated at 1000° C in air and in nitrogen using four-point bending mode. The data of cyclic fatigue tests or static fatigue tests and the morphology of the fractured surfaces in nitrogen were compared with those in air. The cyclic fatigue behavior was remarkably influenced by the atmosphere, while the static fatigue was less influenced. Crack healing effect due to the oxidation around the crack are thought to be the most probable mechanism to affect the cyclic fatigue rate in air.

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