The Influence of Mechanical Stresses on the Characteristics of Laser-Ultrasonic Signals in the Vicinity of a Hole in Silicon Nitride Ceramics

2021 ◽  
Author(s):  
A. L. Glazov ◽  
K. L. Muratikov
Keyword(s):  
Silicon Nitride ◽  
Mechanical Stresses ◽  
Laser Ultrasonic ◽  
Ultrasonic Signals ◽  
Nitride Ceramics

scholarly journals Влияние механических напряжений на поведение лазерных ультразвуковых сигналов вблизи отверстия в керамике нитрида кремния

2021 ◽  
Vol 47 (12) ◽  
pp. 42
Author(s):  
А.Л. Глазов ◽  
К.Л. Муратиков
Keyword(s):  
Experimental Study ◽  
Silicon Nitride ◽  
Thermodynamic Model ◽  
Lattice Defect ◽  
Thermal Excitation ◽  
Defect States ◽  
Laser Ultrasonic ◽  
Ultrasonic Signals ◽  
Compressive Stresses ◽  
Nitride Ceramics

An experimental study of the behavior of laser ultrasonic signals near a hole in a plate from dielectric silicon nitride ceramics under the action of external compressive stresses is carried out. A fundamental discrepancy between the results obtained and similar results obtained by us earlier for metals and a quantitative discrepancy with the predicted thermodynamic model of the formation of thermoelastic signals from stressed materials is shown. An explanation of the observed discrepancies is proposed using the model of thermal excitation of lattice defect states that we proposed earlier.

Microstructure, toughness and flexural strength of self-reinforced silicon nitride ceramics doped with yttrium oxide and ytterbium oxide

2001 ◽  
Vol 201 (2) ◽  
pp. 238-249 ◽  
Author(s):  
Y. S. Zheng ◽  
K. M. Knowles ◽  
J. M. Vieira ◽  
A. B. Lopes ◽  
F. J. Oliveira
Keyword(s):  
Silicon Nitride ◽  
Flexural Strength ◽  
Yttrium Oxide ◽  
Ytterbium Oxide ◽  
Nitride Ceramics

Effect of α/β phase ratio on microstructure and mechanical properties of silicon nitride ceramics

2001 ◽  
Vol 16 (8) ◽  
pp. 2264-2270 ◽  
Author(s):  
Hirokazu Kawaoka ◽  
Tomohiko Adachi ◽  
Tohru Sekino ◽  
Yong-Ho Choa ◽  
Lian Gao ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Silicon Nitride ◽  
Phase Ratio ◽  
Phase Content ◽  
Sintering Process ◽  
Β Phase ◽  
Nitride Ceramics ◽  
Pulse Electric ◽  
Sintering Condition ◽  
Sintered Materials

Highly densed silicon nitride ceramics with various α/β phase ratios were produced by pulse electric current sintering process. The β-phase content of Si3N4 in sintered materials varied from 20 to 100 wt% depending on the sintering condition. The microstructure was observed by scanning electron microscopy and investigated by image analysis. Young's modulus, hardness, fracture toughness, and strength were strongly dependent on the α/β phase ratio. The fracture toughness increased from 4.6 MPa m1/2 for 20-wt% b-phase content to 8.2 MPa m1/2 for 95-wt% β-phase content, and the fracture strength showed a maximum value of about 1.6 GPa at 60-to-80-wt% β-phase content.

Metallizing of silicon nitride ceramics

1986 ◽  
Vol 2 (3) ◽  
pp. 241
Author(s):  
Akio Sayano ◽  
Shun-ichiro Tanaka ◽  
Kazuo Ikeda
Keyword(s):  
Silicon Nitride ◽  
Nitride Ceramics

Dissolution Rate of Silicon Nitride Ceramics into Molten CaO-Al2O3-SiO2 Slags

2005 ◽  
Vol 80 (4) ◽  
pp. 925-932 ◽  
Author(s):  
Shoichirou Taira ◽  
Yasuyuki Yamasaki ◽  
Kunihiko Nakashima ◽  
Katsumi Mori
Keyword(s):  
Silicon Nitride ◽  
Dissolution Rate ◽  
Nitride Ceramics
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