Effect of Oxygen Addition on Ignition of Aero-Gas Turbine at Simulated Altitude Facility

1982 ◽  
Vol 6 (6) ◽  
pp. 425-429 ◽  
Author(s):  
N.K. Chen ◽  
Y.H. Zhao ◽  
S.S. Wu ◽  
Q.S. Zhao ◽  
J.S. Chin
Keyword(s):  
Gas Turbine ◽  
Simulated Altitude ◽  
Oxygen Addition ◽  
Effect Of Oxygen

The Effect of Oxygen Addition on Oxidation Resistance and Cutting Performance of Si3N4 Ceramics

2007 ◽  
Vol 534-536 ◽  
pp. 1089-1092
Author(s):  
Mituyoshi Nagano ◽  
Hideaki Sano ◽  
Shigeya Sakaguchi ◽  
Guo Bin Zheng ◽  
Yasuo Uchiyama
Keyword(s):  
Bending Strength ◽  
Cutting Tools ◽  
Cutting Performance ◽  
Al2o3 Content ◽  
High Wear Resistance ◽  
Composition Analysis ◽  
Performance Improvements ◽  
Oxygen Addition ◽  
Effect Of Oxygen ◽  
Si3n4 Ceramics

The effect of oxygen addition on oxidation behavior of the β-Si3N4 ceramics with 5 mass% Y2O3 and 2 or 4 mass% Al2O3 was investigated by performing oxidation tests in air at 1300° to 1400°C and cutting performance tests. These tests were intended to clarify their ware resistance as cutting tools. The results of mass change, SEM observation and composition analysis of the specimens before and after oxidation test showed that as the Al2O3 content in the β-Si3N4 ceramics increased, mass changes resulted higher oxidation during which process pores and cracks formed due to the release of N2 gas. The values of hardness and bending strength of the specimens with relatively small amount of 2 mass% Al2O3, which formed solid solution in the Si3N4 structure [Si6-zAlzOzN8-z (z = 0.1)], showed larger than those of the specimen with 4 mass% Al2O3 (z = 0.2). The specimens group added with Al2O3 of 2 mass% (Z = 0.1) also showed high wear resistance. From this, we could conclude that the mechanical properties of β-Si3N4 ceramics depending on oxygen introduction is much effective on cutting performance improvements of the cutting performance of β-Si3N4 ceramics.

scholarly journals Effect of Oxygen Addition on the Formation of α′′ Martensite and Athermal ω in Ti–Nb Alloys

2019 ◽  
Vol 60 (9) ◽  
pp. 1842-1849 ◽  
Author(s):  
Sota Kawano ◽  
Sengo Kobayashi ◽  
Satoshi Okano
Keyword(s):  
Oxygen Addition ◽  
Effect Of Oxygen

scholarly journals Effect of oxygen addition to an argon plasma on etching selectivity of poly(methyl methacrylate) to polystyrene

2013 ◽  
Vol 12 (4) ◽  
pp. 041309 ◽  
Author(s):  
Makoto Satake ◽  
Taku Iwase ◽  
Masaru Kurihara ◽  
Nobuyuki Negishi ◽  
Yasuhiko Tada ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Argon Plasma ◽  
Poly Methyl Methacrylate ◽  
Oxygen Addition ◽  
Effect Of Oxygen ◽  
Etching Selectivity

Effects of Oxygen and Nitrogen Addition on Phase Transformation in Ti-10at%V

2020 ◽  
Vol 985 ◽  
pp. 80-85
Author(s):  
Sengo Kobayashi ◽  
Ryohei Fukushima ◽  
Siqi Wu ◽  
Satoshi Okano
Keyword(s):  
Titanium Alloys ◽  
Spinodal Decomposition ◽  
Nitrogen Addition ◽  
Age Hardening ◽  
Solid Solution Strengthening ◽  
Iced Brine ◽  
Arc Melting ◽  
Solution Treated ◽  
Oxygen Addition ◽  
Effect Of Oxygen

The addition of oxygen or nitrogen in titanium alloys increases the hardness by the solid solution strengthening. Spinodal decomposition in titanium alloys is also the way to increase the hardness. This study aimed to reveal the effect of oxygen or nitrogen addition on spinodal decomposition in Ti-10at%V. Ti-10at%V-(0, 1, 3)at%O or N alloys were prepared by arc-melting. They were solution-treated at 1200 or 1300 °C for 0.6 ks and then quenched in iced brine. The solution treated specimens were aged at 375 °C. The increase of hardness was decreased by the oxygen or nitrogen addition in the alloys. The addition of nitrogen more suppressed the age-hardening than the case of oxygen addition. The modulated structure caused by spinodal decomposition in the laths was observed in all the aged specimens. The wavelength of spinodal decomposition of the aged specimens increased with the addition of oxygen or nitrogen, leading to a decrease in age-hardening by spinodal decomposition.

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