Surface Modification of Ferritic and NI Based Alloys for Improved Oxidation Resistance in Sofc Applications

2008 ◽  
pp. 193-200
Author(s):  
Paul D. Jablonski ◽  
David E. Alman ◽  
Steven C. Kung
Keyword(s):  
Surface Modification ◽  
Oxidation Resistance

Enhancement of oxidation resistance of modified P91 grade ferritic-martensitic steel by surface modification using laser shock peening

2019 ◽  
Vol 495 ◽  
pp. 143611 ◽  
Author(s):  
Arun Kumar Rai ◽  
Ramakanta Biswal ◽  
Ram Kishor Gupta ◽  
Sanjay Kumar Rai ◽  
Rashmi Singh ◽  
...  
Keyword(s):  
Surface Modification ◽  
Oxidation Resistance ◽  
Martensitic Steel ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening

EFFECT OF SURFACE MODIFICATION ON THE PROPERTIES OF YAG–ZrB2 CERAMICS

2009 ◽  
Vol 16 (02) ◽  
pp. 281-286
Author(s):  
JIE-GUANG SONG ◽  
SHI-BIN LI ◽  
YIN-YAN JU ◽  
DA-MING DU ◽  
YU-WEI WANG ◽  
...  
Keyword(s):  
Surface Modification ◽  
High Temperature ◽  
Oxidation Resistance ◽  
Raw Materials ◽  
Phase Content ◽  
High Melting ◽  
Oxidation Layer ◽  
Ultra High Temperature Ceramics ◽  
Melting Temperatures ◽  
Effect Of Surface

ZrB 2 belongs to a class of ceramics defined ultra-high-temperature ceramics with extremely high melting temperatures; however, ZrB 2 ceramics is easily oxidized. To make ZrB 2 ceramics possess the better oxidation resistance in the air at high temperature, in this paper, the effect of surface modification on the properties of YAG– ZrB 2 ceramics were investigated. Fracture toughness of sintered ceramics with coated raw materials is higher than that of sintered ceramics with mixed raw materials under the same phase and phase content conditions. Oxidation layer thickness of sintered ceramics with coated raw materials is thinner than that of sintered ceramics with mixed raw materials. The results indicate that the sintered coated structure ceramics with coated raw materials help to increase the mechanical property and oxidation resistance of YAG– ZrB 2 ceramics.

Surface modification of graphite powder with lanthanum ultraphosphate by chemical process and its oxidation resistance

2015 ◽  
Vol 26 (3) ◽  
pp. 901-906 ◽  
Author(s):  
Katsumi Yoshida ◽  
Hideki Hyuga ◽  
Naoki Kondo ◽  
Hideki Kita
Keyword(s):  
Surface Modification ◽  
Oxidation Resistance ◽  
Chemical Process ◽  
Graphite Powder

Improvement of oxidation resistance in graphite for MgO–C refractory through surface modification

2014 ◽  
Vol 24 ◽  
pp. s119-s124 ◽  
Author(s):  
Geun-Ho CHO ◽  
Eun-Hee KIM ◽  
Jing LI ◽  
Je-Hyun LEE ◽  
Yeon-Gil JUNG ◽  
...  
Keyword(s):  
Surface Modification ◽  
Oxidation Resistance

Morphologies of Nonadherent Al2O3 and Matching Substrate Surfaces

1972 ◽  
Vol 30 ◽  
pp. 524-525
Author(s):  
C. S. Giggins ◽  
J. K. Tien ◽  
B. H. Kear ◽  
F. S. Pettit
Keyword(s):  
Electron Microscopy ◽  
Oxide Scale ◽  
Oxidation Resistance ◽  
Substrate Surface ◽  
Morphological Features ◽  
Thermally Induced ◽  
Oxide Spallation ◽  
Oxidation Resistant ◽  
Induced Stresses ◽  
Substrate Surfaces

The performance of most oxidation resistant alloys and coatings is markedly improved if the oxide scale strongly adheres to the substrate surface. Consequently, in order to develop alloys and coatings with improved oxidation resistance, it has become necessary to determine the conditions that lead to spallation of oxides from the surfaces of alloys. In what follows, the morphological features of nonadherent Al2O3, and the substrate surfaces from which the Al2O3 has spalled, are presented and related to oxide spallation.The Al2O3, scales were developed by oxidizing Fe-25Cr-4Al (w/o) and Ni-rich Ni3 (Al,Ta) alloys in air at 1200°C. These scales spalled from their substrates upon cooling as a result of thermally induced stresses. The scales and the alloy substrate surfaces were then examined by scanning and replication electron microscopy.The Al2O3, scales from the Fe-Cr-Al contained filamentary protrusions at the oxide-gas interface, Fig. 1(a). In addition, nodules of oxide have been developed such that cavities were formed between the oxide and the substrate, Fig. 1(a).

Phase transformation and layer evolution in molybdenum disilicide-silicon carbide nanolayered coatings

1994 ◽  
Vol 52 ◽  
pp. 538-539
Author(s):  
H. Kung ◽  
T. R. Jervis ◽  
J.-P. Hirvonen ◽  
M. Nastasi ◽  
T. E. Mitchell ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Oxidation Resistance ◽  
Elevated Temperatures ◽  
Matrix Material ◽  
Molybdenum Disilicide ◽  
High Temperature Strength ◽  
Cross Sectional ◽  
Good Oxidation Resistance ◽  
Structural Applications

MoSi2 is a potential matrix material for high temperature structural composites due to its high melting temperature and good oxidation resistance at elevated temperatures. The two major drawbacksfor structural applications are inadequate high temperature strength and poor low temperature ductility. The search for appropriate composite additions has been the focus of extensive investigations in recent years. The addition of SiC in a nanolayered configuration was shown to exhibit superior oxidation resistance and significant hardness increase through annealing at 500°C. One potential application of MoSi2- SiC multilayers is for high temperature coatings, where structural stability ofthe layering is of major concern. In this study, we have systematically investigated both the evolution of phases and the stability of layers by varying the heat treating conditions.Alternating layers of MoSi2 and SiC were synthesized by DC-magnetron and rf-diode sputtering respectively. Cross-sectional transmission electron microscopy (XTEM) was used to examine three distinct reactions in the specimens when exposed to different annealing conditions: crystallization and phase transformation of MoSi2, crystallization of SiC, and spheroidization of the layer structures.

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