scholarly journals Thermal oxidation curing polycarbosilane fibers by alternating air and vacuum process

RSC Advances ◽  
2020 ◽  
Vol 10 (44) ◽  
pp. 26052-26058
Author(s):  
Xiaohong Li ◽  
Zhaofang Xu ◽  
Lu Chen ◽  
Liu Hong ◽  
Yang Li
Keyword(s):  
Thermal Oxidation ◽  
Oxidation Temperature ◽  
Vacuum Atmosphere

Polycarbosilane (PCS) fibers were cured by a process of alternating air and vacuum atmosphere periodically at thermal oxidation temperature.

Fretting wear behavior of thermal-oxidation on titanium alloy in air and vacuum atmosphere

2021 ◽  
pp. 2150135
Author(s):  
Liangliang Sheng ◽  
Xiangtao Deng ◽  
Hao Li ◽  
Yuxuan Ren ◽  
Guoqing Gou ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Titanium Alloy ◽  
Thermal Oxidation ◽  
Wear Behavior ◽  
Fretting Wear ◽  
Partial Slip ◽  
Ti6al4v Titanium Alloy ◽  
Slip Regime ◽  
Air Atmosphere ◽  
Vacuum Atmosphere

In this work, an in-situ XPS analysis test combined self-designed high precision fretting wear tester was carried out to study the fretting wear behavior and the resulting tribo-oxidation of thermal-oxidation film on Ti6Al4V titanium alloy under the varied working atmosphere. The fretting-induced tribo-oxidation under the air and vacuum ([Formula: see text] Pa) environment was analyzed and its response on the resulting fretting wear resistance and damage mechanism was discussed. Results show that the working environment plays a significant role in the formation of tribo-oxidation and then determining the fretting wear resistance. Thermal-oxidation film in the vacuum atmosphere shows a better fretting wear resistance than that in the air atmosphere for all fretting regimes, except for partial slip regime (PSR) where there is an equivalent fretting wear resistance. Compared with the substrate Ti6Al4V titanium alloy, the thermal-oxidation film in the vacuum atmosphere performs a good protection for titanium alloy, especially for slip regime (SR), but not applied for air atmosphere.

SURFACE MORPHOLOGY AND X-RAY DIFFRACTION ANALYSIS FOR SILICON NANOCRYSTAL-BASED HETEROSTRUCTURES

2013 ◽  
Vol 20 (05) ◽  
pp. 1350046 ◽  
Author(s):  
EVAN T. SALIM
Keyword(s):  
Surface Morphology ◽  
Thermal Oxidation ◽  
Oxidation Process ◽  
Oxidation Temperature ◽  
Silicon Nanocrystal ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rapid Thermal Oxidation ◽  
O Phase ◽  
Thermal Oxidation Process

In this work, we studied the effect of rapid thermal oxidation process on the structural and surface morphology of silicon nanocrystal-based heterostructures. PLD technique was employed in combination with rapid thermal oxidation process to form multilayers heterostructures. Results show the dependence of the surface roughness and structure on the oxidation temperature. Best surface morphology was achieved at 723 K oxidation temperature, at which, the X-ray diffraction result ensured the formation of the Cu 2 O phase at (111) and (002) diffraction plain with uniform porous surface.

Effect of Thermal Oxidation Temperature on the Properties of Micro-Arc Oxidation Ceramic Coating on TC4 Alloy

2016 ◽  
Vol 697 ◽  
pp. 623-626
Author(s):  
Er Xin Ni ◽  
Ji Kang Yan ◽  
Yun Feng Wu ◽  
Yuan Teng ◽  
Zhi Cao Duan ◽  
...  
Keyword(s):  
Phase Composition ◽  
Surface Morphology ◽  
Thermal Oxidation ◽  
Ceramic Coating ◽  
Oxidation Temperature ◽  
Micro Hardness ◽  
Hardness Tester ◽  
Coating Surface ◽  
Tc4 Alloy ◽  
Micro Arc Oxidation

The effect of thermal oxidation temperature on the properties of MAO ceramic coating was investigated, The phase composition and surface morphology of composite oxidation coating were analyzed by XRD and SEM. The micro-hardness of composite oxidation coating were tested by micro hardness tester. The results shown that the composite oxidation coating consists of rutile, anatase Ti and HA. With the thermal oxidation temperature increasing, the micro-hardness of composite oxidation coatings were improved, but when the thermal oxidation temperature rose from 600 °C to 700 °C, the micro-hardness of coating dropped from 575 HV to 505 HV. With the thermal oxidation temperature increasing, the numbers of micro-porous on coating surface was decreased , and the composite oxidation coating became more density.

scholarly journals Characteristic of Oxide Layers Obtained on Titanium in the Process of Thermal Oxidation

2016 ◽  
Vol 61 (2) ◽  
pp. 853-856 ◽  
Author(s):  
K. Aniołek ◽  
M. Kupka ◽  
A. Barylski ◽  
Ł. Mieszczak
Keyword(s):  
Thermal Oxidation ◽  
Layer Growth ◽  
Oxidation Temperature ◽  
Structure And Properties ◽  
Initial State ◽  
Crystallographic Form ◽  
Oxide Layers ◽  
X Ray ◽  
Oxide Particles ◽  
Oxidation In Air

Abstract Thermal oxidation in air may be one method to improve the properties of titanium and its alloys through its influence on the structure and properties of the material’s surface layer. This paper presents a description of oxide layers obtained on the surface of Grade 2 titanium as a result of oxidation at temperatures of 600 and 700°C. On the basis of kinetic curves, it was found that the intensity of oxide layer growth increased with oxidation temperature. Studies of the surface morphology of oxide layers showed that the size of the formed oxide particles was greater following oxidation at 600°C. The obtained layers were subjected to X-ray phase analysis and microhardness measurements. Irrespective of oxidation temperature, the scale consisted of TiO2 oxide in the crystallographic form of rutile and of Ti3O oxide. The hardness of oxide layers amounted to around 1265 HV and was more than 4 times higher compared to the material in i ts initial state.

Effect of oxidation temperature on the ferromagnetism of Co doped ZnO films via thermal oxidation of electrodeposited Co/Zn bilayers

2017 ◽  
Vol 43 (15) ◽  
pp. 12724-12730 ◽  
Author(s):  
Yang Gao ◽  
Guojian Li ◽  
Jianhao Wang ◽  
Zhao Wang ◽  
Shiying Liu ◽  
...  
Keyword(s):  
Thermal Oxidation ◽  
Oxidation Temperature ◽  
Zno Films ◽  
Doped Zno ◽  
Co Doped

Ultrahigh-Temperature Oxidation of 4H-SiC(0001) and an Impact of Cooling Process on SiO2/SiC Interface Properties

2017 ◽  
Vol 897 ◽  
pp. 323-326 ◽  
Author(s):  
Takuji Hosoi ◽  
Daisuke Nagai ◽  
Mitsuru Sometani ◽  
Takayoshi Shimura ◽  
Manabu Takei ◽  
...  
Keyword(s):  
Thermal Oxidation ◽  
Linear Growth ◽  
State Density ◽  
Oxidation Temperature ◽  
Linear Growth Rate ◽  
Oxide Growth ◽  
Interface Properties ◽  
Cooling Process ◽  
Temperature Oxidation ◽  
Ultrahigh Temperature

This paper reviews our recent work on ultrahigh-temperature oxidation of 4H-SiC(0001) surfaces. Our rapid thermal oxidation experiments demonstrated the reaction-limited linear growth at temperatures ranging from 1200 to 1600°C. The Arrhenius plot of linear growth rate of thermal oxidation can be fitted by a linear line, and the activation energy of oxide growth in dry O2 oxidation was estimated to be 2.9 eV. We also found that unintentional oxidation during the cooling down process severely degrades SiO2/SiC interface properties, resulting in positive flatband voltage shift (VFB) and hysteresis in capacitance-voltage (C-V) characteristics regardless of oxidation temperature. By effectively suppressing oxide growth during the cooling process, we have clarified that SiO2/SiC interface properties depend on oxidation temperature and the lowest interface state density was obtained for the oxide formed at 1450°C.

Effects of thermal oxidation temperature on vacuum evaporated tin dioxide film

2012 ◽  
Vol 51 (3) ◽  
pp. 421-429 ◽  
Author(s):  
H.M. Çakmak ◽  
H.A. Çetinkara ◽  
S. Kahraman ◽  
F. Bayansal ◽  
M. Tepe ◽  
...  
Keyword(s):  
Thermal Oxidation ◽  
Tin Dioxide ◽  
Oxidation Temperature ◽  
Dioxide Film
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