Micro- and Nanostructures of RCoCuFeZr Heterogeneous Alloys with High Temperature Stability

2016 ◽  
Vol 845 ◽  
pp. 46-49
Author(s):  
Elena M. Semenova ◽  
M.B. Lyakhova ◽  
A.I. Ivanova ◽  
Maxim N. Ulyanov
Keyword(s):  
High Temperature ◽  
Chemical Composition ◽  
Cellular Structure ◽  
Temperature Stability ◽  
High Coercivity ◽  
Thermal Treatments ◽  
High Temperature Stability ◽  
The Difference ◽  
Pass Through ◽  
Heterogeneous Alloys

The study of microstructures and nanostructures of RCoCuFeZr (R=Sm, Gd) heterogeneous alloys at different stages of the thermal treatments were carried out. All samples in high coercivity condition consist of three types of micro-sized areas with different chemical composition 1:5 (A), 2:17 (B) and Zr-rich (C). In the process of heat treatment, the alloys pass through several stages of formation of nanostructures: from homogeneous (after high-temperature annealing) to a “cellular” structure (after aging at 800°C). The two main structural components A and B have similar nanostructure and the difference in their micromagnetic characteristics is determined by the chemical composition of the phases of the “cellular” structure.

scholarly journals Influence of Monomer Structures on the High Temperature Properties of Poly[(Alkylamino)Borazine)]s Derived BN

2012 ◽  
Vol 6 (1) ◽  
pp. 23-27 ◽  
Author(s):  
Yongpeng Lei ◽  
Yingde Wang ◽  
Yongcai Song
Keyword(s):  
High Temperature ◽  
Chemical Composition ◽  
Oxidation Resistance ◽  
Density Measurement ◽  
Temperature Stability ◽  
High Temperature Stability ◽  
Preceramic Polymers ◽  
Monomer Structure ◽  
Similar Chemical ◽  
Higher Temperature

Preceramic polymers to boron nitride (BN) have been synthesized by thermal condensation of different (alkylamino)borazine monomers. Crystalline BN was obtained by pyrolysis of those polymeric precursors in NH3 and then in Ar. The influence of monomer structure on the chemical composition, microstructure, oxidation resistance and high temperature stability of BN was investigated by a combination of elemental analysis (EA), density measurement, FTIR, XPS, XRD, HRTEM and TGA. With similar chemical composition, BN derived from symmetric monomer exhibited a higher crystallinity, better oxidation resistance and higher temperature stability. This was because that the structure of the precursor polymerized from symmetric molecular was close to that of hexagonal BN (h-BN).

UNS N06455

Alloy Digest ◽  
1989 ◽  
Vol 38 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Stress Corrosion Cracking ◽  
Temperature Stability ◽  
Heat Treating ◽  
High Ductility ◽  
High Temperature Stability ◽  
Nickel Chromium ◽  
Long Time ◽  
Resistance To Stress

Abstract UNS NO6455 is a nickel-chromium-molybdenum alloy with outstanding high-temperature stability as shown by high ductility and corrosion resistance even after long-time aging in the range 1200-1900 F. The alloy also has excellent resistance to stress-corrosion cracking and to oxidizing atmospheres up to 1900 F. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-367. Producer or source: Nickel and nickel alloy producers.

UNS R54620

Alloy Digest ◽  
1987 ◽  
Vol 36 (7) ◽  
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Time Use ◽  
Temperature Stability ◽  
High Strength ◽  
Heat Treating ◽  
High Temperature Stability ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Long Time

Abstract UNS No. R54620 is an alpha-beta titanium alloy. It has an excellent combination of tensile strength, creep strength, toughness and high-temperature stability that makes it suitable for service to 1050 F. It is recommended for use where high strength is required. It has outstanding advantages for long-time use at temperatures to 800 F. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ti-86. Producer or source: Titanium alloy mills.

La2O3 Doped Y2O3 Stabilized ZrO2 TBC Prepared by EB-PVD

2006 ◽  
Vol 317-318 ◽  
pp. 501-504 ◽  
Author(s):  
Mineaki Matsumoto ◽  
Norio Yamaguchi ◽  
Hideaki Matsubara
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
High Resistance ◽  
Thermal Transport ◽  
Temperature Stability ◽  
High Temperature Stability ◽  
Microstructural Observation ◽  
Low Thermal Conductivity ◽  
Ysz Coating

Effect of La2O3 addition on thermal conductivity and high temperature stability of YSZ coating produced by EB-PVD was investigated. La2O3 was selected as an additive because it had a significant effect on suppressing densification of YSZ. The developed coating showed extremely low thermal conductivity as well as high resistance to sintering. Microstructural observation revealed that the coating had fine feather-like subcolumns and nanopores, which contributed to limit thermal transport. These nanostructures were thought to be formed by suppressing densification during deposition.

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