scholarly journals Microstructure of Silicon Nitride Ceramics and Morphology of Surface Damage Induced by Round Indenter

1994 ◽  
Vol 102 (1184) ◽  
pp. 350-354
Author(s):  
Yasuo UCHIYAMA ◽  
Kyozo SAHARA ◽  
Huiming CHENG ◽  
Kazuo KOBAYASHI ◽  
Sigetaka WADA ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Surface Damage ◽  
Nitride Ceramics ◽  
Morphology Of Surface

Experimental Investigation of Thermo-Mechanical Characteristics in Laser-Assisted Machining of Silicon Nitride Ceramics

1999 ◽  
Author(s):  
Shuting Lei ◽  
Yung C. Shin ◽  
Frank P. Incropera
Keyword(s):  
Silicon Nitride ◽  
Tool Wear ◽  
Material Removal ◽  
Mechanical Characteristics ◽  
Surface Damage ◽  
Workpiece Temperature ◽  
Laser Assisted Machining ◽  
Nitride Ceramics ◽  
On Line ◽  
Extent Of Damage

Abstract Laser-assisted machining (LAM) of silicon nitride (Si3N4) is evaluated for its potential to become an economically viable process in fabricating precision ceramic parts. On-line measurements of cutting force and workpiece temperature are performed, and tool wear and surface integrity are examined. Tool wear characteristics are determined as a function of workpiece temperature, which is measured on-line using a laser pyrometer. Tool wear/failure mechanisms are characterized using optical microscopy, while application of scanning electron microscopy to heated and machined surfaces, as well as to chips, is used to infer material removal mechanisms and the extent of damage caused by LAM. The sub-surface damage of parts produced by LAM is compared with that of typical ground parts.

Experimental Investigation of Thermo-Mechanical Characteristics in Laser-Assisted Machining of Silicon Nitride Ceramics

2000 ◽  
Vol 123 (4) ◽  
pp. 639-646 ◽  
Author(s):  
S. Lei ◽  
Y. C. Shin ◽  
F. P. Incropera
Keyword(s):  
Silicon Nitride ◽  
Tool Wear ◽  
Material Removal ◽  
Mechanical Characteristics ◽  
Surface Damage ◽  
Workpiece Temperature ◽  
Laser Assisted Machining ◽  
Nitride Ceramics ◽  
On Line ◽  
Extent Of Damage

Laser-assisted machining (LAM) of silicon nitride Si3N4 is evaluated for its potential to become an economically viable process in fabricating precision ceramic parts. On-line measurements of cutting force and workpiece temperature are performed, and tool wear and surface integrity are examined. Tool wear characteristics are determined as a function of workpiece temperature, which is measured on-line using a laser pyrometer. Tool wear/failure mechanisms are characterized using optical microscopy, while application of scanning electron microscopy to heated and machined surfaces, as well as to chips, is used to infer material removal mechanisms and the extent of damage caused by LAM. The sub-surface damage of parts produced by LAM is compared with that of typical ground parts.

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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