Mechanical properties and adhesion of oxide films examined by a solid particle impact method at high temperature corrosive environments

Wear ◽  
2005 ◽  
Vol 258 (1-4) ◽  
pp. 92-99 ◽  
Author(s):  
Yoshinori Isomoto Oka ◽  
Yasuhiro Mukai ◽  
Toshinori Tsumura
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Solid Particle ◽  
Oxide Films ◽  
Particle Impact ◽  
Corrosive Environments

scholarly journals Mechanical Properties and Adhesion of Oxide Films Formed on Pure Titanium at High Temperature Corrosive Environments

2006 ◽  
Vol 55 (1) ◽  
pp. 25-31 ◽  
Author(s):  
Yoshinori Isomoto ◽  
Takahiro Yamabe ◽  
Toki Yoshida ◽  
Toshinori Tsumura
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Oxide Films ◽  
Pure Titanium ◽  
Corrosive Environments

Exfoliation and Fracture Behavior of Oxide Films Formed on Titanium and Its Alloy in High Temperature Environments

2006 ◽  
Vol 522-523 ◽  
pp. 417-424 ◽  
Author(s):  
Yoshinori Isomoto Oka ◽  
Takahiro Yamabe ◽  
Toshinori Tsumura
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
High Temperature ◽  
Oxide Film ◽  
Oxide Films ◽  
Pure Titanium ◽  
Specimen Surface ◽  
Wide Range ◽  
Basic Behavior ◽  
Corrosive Environments

It is very difficult to obtain mechanical properties of oxide films formed on a material in high temperature environments despite its importance of estimating material degradation caused by such as thermal stress. Corrosion/oxidation tests were conducted for pure titanium and titanium alloy in high temperature corrosive environments of wet air and water vapor with hydrogen chloride at temperatures from 673 K to 973 K to look into basic behavior of degradation and the growth of titanium oxide films. It was found that oxide films were usually formed on the specimen surface and the growth was accelerated by the corrosiveness of the environment. In order to examine mechanical properties and exfoliation of corrosion products or oxide films formed on titanium and its alloy, tests of single particle impact on the specimen surface with a glass bead were performed in high temperature corrosive environments. The piling-up surfaces around impact craters were formed and plastically strained. The oxide film formed on the metal surface was detached in a wide range of the circumference and fractured a little far from the rim of the crater. Then fracture and exfoliation stress of the oxide film were estimated by the calculation of impact energy and fractured and detached areas. It was found that both the fracture and exfoliation stress of the oxide films were different depending on the corrosive environment and chemical composition of titanium alloy.

NIMAG 133

Alloy Digest ◽  
1976 ◽  
Vol 25 (6) ◽  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Vapor Pressure ◽  
Heat Treating ◽  
Pure Nickel ◽  
Gas Content ◽  
Temperature Performance ◽  
Commercially Pure ◽  
Corrosive Environments

Abstract NIMAG 133 is a wrought form of commercially pure nickel. It has good mechanical properties and excellent resistance to many corrosive environments. It has useful magnetic and magnetostrictive properties, high electrical and thermal conductivities, low gas content and low vapor pressure. Among its uses are plates (anodes) in vacuum tubes. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-229. Producer or source: Spang Industries Inc..

The Development of Alumina Forming Austenitic Alloy for Core Application in Advanced Nuclear Reactors

2020 ◽  
Vol 999 ◽  
pp. 72-80
Author(s):  
Zhang Jian Zhou ◽  
Ling Zhi Chen ◽  
Yuan Gao ◽  
Qi Wang
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Room Temperature ◽  
High Efficiency ◽  
Nuclear Reactors ◽  
Potential Applications ◽  
Core Components ◽  
High Burnup ◽  
Corrosive Environments

The development of materials for core components which can serve in high temperature corrosive environments for a long service time is crucial to realize high efficiency and high-burnup operation of advanced nuclear reactors. Alumina forming austenitic (AFA) alloy is a kind of promising materials with improved corrosion resistance as well as strength at elevated temperature. The progress on the composition design and characterization of AFA alloys are reviewed in this work for evaluation their potential applications in advanced nuclear reactors. AFA alloys without the addition of carbon have been fabricated. Microstructures were observed by SEM and TEM. Mechanical properties were measured at room temperature and high temperature.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

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