MoO 2 Cocatalytic Fe(II)/Fe(III) for the Activation of Peroxymonosulfate with Enhanced Oxidation Performance

2019 ◽  
Author(s):  
Jiahui Ji ◽  
Rashed M. Aleisa ◽  
Huan Duan ◽  
Jinlong Zhang ◽  
Yadong Yin ◽  
...  
Keyword(s):  
Oxidation Performance ◽  
Enhanced Oxidation

Enhanced oxidation performance of pitch fibers formed from a heterogeneous pitch blend

Carbon ◽  
2014 ◽  
Vol 73 ◽  
pp. 325-332 ◽  
Author(s):  
Yanbo Yao ◽  
Ling Liu ◽  
Jianming Chen ◽  
Yanming Dong ◽  
Anhua Liu
Keyword(s):  
Oxidation Performance ◽  
Enhanced Oxidation

Preparation and enhanced oxidation performance of a Hf-doped single-phase Pt-modified aluminide coating

2016 ◽  
Vol 113 ◽  
pp. 17-25 ◽  
Author(s):  
Y.F. Yang ◽  
C.Y. Jiang ◽  
H.R. Yao ◽  
Z.B. Bao ◽  
S.L. Zhu ◽  
...  
Keyword(s):  
Single Phase ◽  
Aluminide Coating ◽  
Oxidation Performance ◽  
Enhanced Oxidation

Oxidation Performance of High Temperature Mo-Si-B Alloys and Coatings

2008 ◽  
Vol 595-598 ◽  
pp. 1065-1074 ◽  
Author(s):  
John H. Perepezko ◽  
F. Rioult ◽  
R. Sakidja
Keyword(s):  
High Temperature ◽  
Interface Reaction ◽  
Temperature Stability ◽  
Reaction Products ◽  
High Temperature Stability ◽  
Transient Stage ◽  
High Temperature Mechanical Properties ◽  
Oxidation Performance ◽  
Enhanced Oxidation ◽  
And Performance

Mo-Si-B alloys are attractive due to their high temperature mechanical properties and high melting temperature. The oxidation of multiphase alloys develops in two distinct stages. First, there is a transient stage that corresponds to the evaporation of the volatile MoO3 and to an initial high recession rate. The steady state stage of the oxidation begins when the slower forming borosilicate layer becomes continuous and inhibits further rapid oxidation. Then, the oxidation rate is limited by oxygen diffusion through the borosilicate layer. In order to inhibit the transient stage, a coating strategy has been developed to capitalize on the interdiffusion reactions and to employ a kinetic bias to modify interface reaction products in order to maximize the high temperature stability and performance. In order to achieve a compatible interface coating together with enhanced oxidation resistance, a pack cementation process has been adopted to synthesize metal-rich silicide and borosilicide surface layers. The analysis of the enhanced oxidation performance indicates that a strategy based upon the operating principles of interface reactions in multicomponent systems is effective for developing stable and robust coating systems.

scholarly journals Preparation of MCrAlY–Al2O3 Composite Coatings with Enhanced Oxidation Resistance through a Novel Powder Manufacturing Process

2019 ◽  
Vol 28 (3) ◽  
pp. 433-443 ◽  
Author(s):  
Mingwen Bai ◽  
Bo Song ◽  
Liam Reddy ◽  
Tanvir Hussain
Keyword(s):  
Oxidation Resistance ◽  
Manufacturing Process ◽  
Composite Powder ◽  
Composite Coatings ◽  
Submicron Particles ◽  
Second Phase ◽  
Mcraly Coatings ◽  
Powder Feedstock ◽  
Enhanced Oxidation ◽  
Powder Manufacturing

Abstract MCrAlY–Al2O3 composite coatings were prepared by high-velocity oxygen fuel thermal spraying with bespoke composite powder feedstock for high-temperature applications. Powder processing via a suspension route was employed to achieve a fine dispersion of α-Al2O3 submicron particles on the MCrAlY powder surface. This was, however, compromised by ~ 50% less flowability of the feedstock during spraying. Nevertheless, the novel powder manufacturing process introduced in this study has shown potential as an alternative route to prepare tailored composite powder feedstock for the production of metal matrix composites. In addition, the newly developed MCrAlY–Al2O3 composite coatings exhibited superior oxidation resistance, compared to conventional MCrAlY coatings, with the formation of nearly exclusively Al2O3 scale after isothermal oxidation at 900 °C for 10 h. The addition of α-Al2O3 particles in the MCrAlY coatings as a second phase was found to have promoted the formation of YAG oxides (YxAlyOz) during spraying and also accelerated the outwards diffusion of Al, which resulted in enhanced oxidation resistance.

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