Characterization of Thermal Stability and High-Temperature Tribological Behavior of Electroless Ni-B Coating

2018 ◽  
Vol 49 (8) ◽  
pp. 3217-3236 ◽  
Author(s):  
Soupitak Pal ◽  
Rohit Sarkar ◽  
Vikram Jayaram
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Tribological Behavior ◽  
Electroless Ni

Characterization of Ti/TiN and TiN Conductive Layer for High Temperature MEMS Devices

2005 ◽  
Vol 872 ◽  
Author(s):  
Peter Lange ◽  
Birger Ohlsen ◽  
Sebastian Puls ◽  
Joerg Syre
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Elevated Temperature ◽  
Mechanical Stability ◽  
Fast Response ◽  
Conductive Layer ◽  
Mems Devices ◽  
Thermal Isolation ◽  
Effects Of Temperature

AbstractThe effects of temperature on micro heaters made of Ti/TiN stacks and pure TiN layers on bulk micromachined membranes have been studied. Ti/TiN stacks show a thermal stability up to 380°C, beyond that temperature an enhanced interaction within the stack and/or with adjacend layers leads to a degradation of the resistance. The pure TiN layers withstand temperatures up to 600 °C, this limitation is only given by the mechanical stability of the membran stack, which is destroyed beyond this temperature. These layers are suitable for sensors in which an elevated temperature provided by heating lines on a membran for thermal isolation and fast response is necessary for functionality.

High Thermal Stability of Mo/Si3N4/Mo/Si3N4/SiO2 Multilayer Solar Selective Coatings

2015 ◽  
Vol 1102 ◽  
pp. 67-71 ◽  
Author(s):  
Rui Hua Yang ◽  
Jin Yang Liu ◽  
Li Mei Lin ◽  
Fa Chun Lai ◽  
Yan Qu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Multilayer Structure ◽  
High Thermal Stability ◽  
Solar Absorptance ◽  
Selective Coating ◽  
Thermal Emittance ◽  
Quartz Substrates ◽  
Thermal Stability Of

In terms of good optical properties and high thermal stability, Mo/Si3N4/Mo/Si3N4/SiO2 coatings based on metal/dielectric multilayer structure were adapted to the solar selective coating at high operating temperatures. The coatings exhibited high solar absorptance in the range of 0.924 ~ 0.936 and low thermal emittance of 0.114 ~ 0.118. The coatings deposited on quartz substrates were thermally stable up to 625 °C in air for 2 h, while they were degraded at 650 °C from the characterization of the absorptance and emittance. The degradation of the coatings was mainly due to the oxidation of molybdenum in air, which was confirmed by Raman spectroscopy. Compared with the thermal stability in air, the coatings were much more stable in vacuum under high temperature. The remarkable thermal stability of the Mo/Si3N4/Mo/Si3N4/SiO2 coatings in air and in vacuum makes them suitable to be applied at high temperature applications.

scholarly journals Mechanical characterization of a prototype a-C:Cr,Si and its tribological behavior at high temperature

2016 ◽  
Vol 100 ◽  
pp. 242-254 ◽  
Author(s):  
M.H. Staia ◽  
L. Dubar ◽  
M. Dubar ◽  
E.S. Puchi-Cabrera ◽  
A. Iost ◽  
...  
Keyword(s):  
High Temperature ◽  
Mechanical Characterization ◽  
Tribological Behavior

scholarly journals Comprehensive microstructural and optical characterization of the thermal stability of aluminum-titanium oxynitride thin films after high temperature annealing in air

2021 ◽  
Author(s):  
R. Escobar-Galindo ◽  
I. Heras ◽  
E. Guillén ◽  
F. Munnik ◽  
I. Azkona ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
High Temperature ◽  
Dielectric Behavior ◽  
Vacuum Arc ◽  
Surface Oxide Layer ◽  
High Temperature Annealing ◽  
Elastic Recoil ◽  
Thermal Stability Of

AbstractThe thermal stability of two AlyTi1-y(OxN1-x) layers prepared by cathodic vacuum arc deposition with different oxygen content was studied after high temperature annealing of the samples in air. These layers were designed to be part of solar-selective coating (SSC) stacks. Compositional and microstructural characterization of the thin films was performed before and after the thermal treatment by elastic recoil detection (ERD), transmission electron microscopy, and Raman spectroscopy. AlyTi1-yN sample was stable after 2 h of annealing at 450 °C. Initial stages of the formation of a surface oxide layer after annealing at 650 °C were observed both by ERD and Raman analysis. Contrarily, no changes were found after 2 h annealing treatment either at 450 and 650 °C in the composition and microstructure of AlyTi1-y(OxN1-x) sample. In both samples, the formation of a surface anatase TiO2 film was reported after 2 h annealing at 800 °C. These compositional and microstructural changes were correlated with the optical properties determined by spectroscopic ellipsometry. A transition from metallic to dielectric behavior with increasing annealing temperature was observed. These results complete the durability studies on the designed SSC based on AlyTi1-y(OxN1-x) materials, confirming that these stacks withstand breakdown at 600 °C in air.

Acidic Treatment of CaO-Based Materials for Medium-High Temperature CO2 Capture

2015 ◽  
Vol 656-657 ◽  
pp. 18-22
Author(s):  
Kuo Hsin Lin ◽  
Po Hsueh Chang ◽  
Ching Tsung Yu ◽  
San Yuan Chen
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Thermal Resistance ◽  
Calcium Oxide ◽  
Diffraction Peak ◽  
Diffraction Spectrum ◽  
Capture Reaction ◽  
Stirring Time ◽  
Capture Capacity

In this work, a series of CaO-based materials for medium-high temperature (500-800 °C) CO2capture were synthesized from limestone by acidic treatment. In order to enhance its thermal stability, CaO-based materials were modified with Al(NO3)3. With various stirring time of 24, 48 and 72 hours, three types of CO2capture sorbent were synthesized, named LA24, LA48 and LA72, respectively. TGA results showed the CaO-based materials were activated in the CO2capture reaction of temperature range of 500-800 °C. LA24 exhibited the best CO2capture capacity of 53.8 wt % as well as stability of 93.2 % after 10 cycles test. Furthermore, all of the modified CaO-based materials showed good thermal resistance upon 900 °C. It was consistent with expectation by the contributions of alumina coexistence with calcium oxide. XRD results indicated that CaO dominated in the diffraction spectrum before capturing CO2, and a side diffraction peak of Al2O3was also observed. The characterization of CaO-based materials was also investigated by BET and SEM, respectively.

Tribological behavior of electroless Ni–B–W coating at room and elevated temperatures

2018 ◽  
Vol 232 (11) ◽  
pp. 1450-1466 ◽  
Author(s):  
Arkadeb Mukhopadhyay ◽  
Tapan Kumar Barman ◽  
Prasanta Sahoo
Keyword(s):  
Thermal Stability ◽  
Wear Resistance ◽  
Coefficient Of Friction ◽  
Elevated Temperatures ◽  
Tribological Behavior ◽  
Wear Test ◽  
High Hardness ◽  
X Ray ◽  
Heat Treated ◽  
Electroless Ni

Sodium borohydride reduced electroless Ni–B coatings possess high hardness, wear resistance, and low coefficient of friction. They are found to be suitable candidates for wear reduction of mechanical components. In a quest to achieve enhanced tribological behavior and high thermal stability, the present work reports the inclusion of W to Ni–B coatings. Electroless method is employed for Ni–B–W coating deposition on AISI 1040 steel specimens. Post deposition, the coatings are heat treated at 350 ℃, 400 ℃, and 450 ℃. Deposit characterization is carried out using energy-dispersive X-ray analysis, X-ray diffraction, and scanning electron microscopy. Inclusion of W leads to an increase in microhardness and thermal stability of Ni–B coatings. The tribological behavior of as-deposited and heat-treated Ni–B–W coatings are investigated at room and elevated temperatures (100 ℃, 300 ℃, and 500 ℃). Heat-treated coatings show lower wear rate at room temperature compared to as-deposited ones but the coefficient of friction increases. Tribological test results at elevated temperatures suggest an improvement in the wear resistance and coefficient of friction at 300 ℃ and 500 ℃ in comparison with 100 ℃. Phase transformation study post wear test indicate microstructural changes in the coating due to the in situ heat treatment at high temperature. The tribological behavior of the coatings at 100 ℃ and 300 ℃ is mainly governed by the loose wear debris and formation of debris patches, respectively. Whereas at 500 ℃, formation of protective tribo-oxide patches is also observed.

The Ordered Phase Formation in Ti-Al-Ga Alloys

1970 ◽  
Vol 28 ◽  
pp. 440-441
Author(s):  
Shiro Fujishiro ◽  
Harold L. Gegel
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Titanium Alloys ◽  
Growth Kinetics ◽  
Stoichiometric Composition ◽  
Good Potential ◽  
Alpha Titanium ◽  
Cold Rolled ◽  
Kinetics Of ◽  
Thermal Stability Of

Ordered-alpha titanium alloys having a DO19 type structure have good potential for high temperature (600°C) applications, due to the thermal stability of the ordered phase and the inherent resistance to recrystallization of these alloys. Five different Ti-Al-Ga alloys consisting of equal atomic percents of aluminum and gallium solute additions up to the stoichiometric composition, Ti3(Al, Ga), were used to study the growth kinetics of the ordered phase and the nature of its interface.The alloys were homogenized in the beta region in a vacuum of about 5×10-7 torr, furnace cooled; reheated in air to 50°C below the alpha transus for hot working. The alloys were subsequently acid cleaned, annealed in vacuo, and cold rolled to about. 050 inch prior to additional homogenization

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