scholarly journals Effects of Al Addition and Minor Elements on Oxidation Behaviour of FeCr Alloys

1995 ◽  
Vol 05 (C7) ◽  
pp. C7-365-C7-374 ◽  
Author(s):  
J.-M. Herbelin ◽  
M. Mantel
Keyword(s):  
Oxidation Behaviour ◽  
Minor Elements ◽  
Al Addition

Oxidation of Nb/Nb5Si3 In Situ Composites Fabricated via Spark Plasma Sintering with Al Addition

2013 ◽  
Vol 376 ◽  
pp. 49-53 ◽  
Author(s):  
Wen Yuan Long ◽  
Xiang Yan Zou ◽  
Wei Dong Wang ◽  
Jun Ping Yao
Keyword(s):  
Oxidation Resistance ◽  
Spark Plasma Sintering ◽  
Raw Materials ◽  
Oxidation Behaviour ◽  
X Ray Diffraction ◽  
In Situ Composites ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Al Addition

Dense Nb/Nb5Si3composites were fabricated via spark plasma sintering technology using Nb, Si, and Al elemental powders as raw materials. The microstructures of the synthesised composites were analysed through scanning electron microscopy, X-ray diffraction, and electron probe microanalysis. The results show that the composites consisted of residual Nb particle phase and Nb5Si3phase. The microstructure of the Nb/ Nb5Si3in situ composites was evidently affected by Al addition, which prompted the formation of the Al3Nb10Si3phase. The oxidation resistance of the Nb/Nb5Si3in situ composites significantly improved with the increase in Al addition. Pesting oxidation behaviour was exhibited at 800°C by the Nb-20Si composites when exposed to air for 4h. This pest oxidation behaviour is not exhibited by the Nb-20Si-10Al and Nb-20Si-15Al composites after exposure to air for ~10h. The composite exhibits the best oxidation resistance at 15at% Al.

scholarly journals Investigation of Element Effect on High Temperature Oxidation of HVOF NiCoCrAlX Coatings

2018 ◽  
Author(s):  
Pimin Zhang ◽  
Ru Lin Peng ◽  
Xin-Hai Li ◽  
Sten Johansson
Keyword(s):  
Gas Turbines ◽  
Cyclic Oxidation ◽  
Isothermal Oxidation ◽  
Oxidation Behaviour ◽  
Temperature Oxidation ◽  
Oxidation Test ◽  
Minor Elements ◽  
Cyclic Oxidation Test ◽  
Boundary Model ◽  
Comprehensive Study

MCrAlX (M: Ni or Co or both, X: minor elements) coatings have been widely used to protect hot components in gas turbines against oxidation and hot corrosion at high temperatures. Understanding the influence of the X-elements on oxidation behaviour is important in the design of durable MCrAlX coatings. In this study, NiCoCrAlX coatings doped with Y+Ru and Ce, respectively, were deposited on Inconel-792 substrate by HVOF. The samples were subjected to isothermal oxidation test in laboratory air at 9000, 1000, 1100 ºC and cyclic oxidation test between 100 ºC and 1100 ºC with 1 hour dwell time at 1100 ºC. It was observed that the coating with Ce shows a much higher oxidation rate than the coating with Y+Ru under both isothermal and cyclic oxidation tests. Besides, β-depletion due to interdiffusion between coating and substrate was significantly lower with Ru addition. Simulations results using both a moving phase boundary model and an established oxidation-diffusion model show that Ru stabilize β grains which reduces β-depletion of coating due to substrate interdiffusion. This paper presents a comprehensive study of the influence of Ce and Ru on oxidation behaviour including investigation of the microstructure evolution influenced by oxidation time at coating surface and coating-substrate interface combining experiment and simulation results.

OXIDATION BEHAVIOUR OF A DEVELOPMENTAL NICKEL-BASED ALLOY AND THE ROLE OF MINOR ELEMENTS

2021 ◽  
pp. 110002
Author(s):  
Mary Taylor ◽  
Rengen Ding ◽  
Paul Mignanelli ◽  
Mark Hardy
Keyword(s):  
Oxidation Behaviour ◽  
Minor Elements ◽  
Nickel Based Alloy

High Resolution Observations of Ion-Milling Induced Transformation in Synthetic Hollandses

1981 ◽  
Vol 39 ◽  
pp. 114-115 ◽  
Author(s):  
T. J. Headley
Keyword(s):  
High Resolution ◽  
Radioactive Waste Disposal ◽  
Ion Milling ◽  
Minor Elements ◽  
Waste Forms ◽  
Carbon Substrates ◽  
Structural Differences ◽  
Oxide Phases ◽  
Argon Ions ◽  
High Resolution Microscopy

Oxide phases having the hollandite structure have been identified in multiphase ceramic waste forms being developed for radioactive waste disposal. High resolution studies of phases in the waste forms described in Ref. [2] were initiated to examine them for fine scale structural differences compared to natural mineral analogs. Two hollandites were studied: a (Ba,Cs,K)-titan-ate with minor elements in solution that is produced in the waste forms, and a synthesized BaAl2Ti6O16 phase containing ∼ 4.7 wt% Cs2O. Both materials were consolidated by hot pressing at temperatures above 1100°C. Samples for high resolution microscopy were prepared both by ion-milling (7kV argon ions) and by crushing and dispersing the fragments on holey carbon substrates. The high resolution studies were performed in a JEM 200CX/SEG operating at 200kV.

Oxidation behaviour and strength degradation of a Yb 2 O 3 -SiO 2 -doped hot-pressed silicon nitride between 1200 and 1500°C

2002 ◽  
Vol 82 (16) ◽  
pp. 3027-3043 ◽  
Author(s):  
Shuqi Guo ◽  
Naoto Hirosaki ◽  
Toshiyuki Nishimura ◽  
Yoshinobu Yammoto ◽  
Mamoru Mitomo
Keyword(s):  
Silicon Nitride ◽  
Strength Degradation ◽  
Oxidation Behaviour

Equivalent uranium and selected minor elements in magnetic concentrates from the Candle Quadrangle, Solomon Quadrangle, and elsewhere in Alaska

1980 ◽  
Author(s):  
Kuo-Liang Pan ◽  
W.C. Overstreet ◽  
Keith Robinson ◽  
A.E. Hubert ◽  
G.L. Crenshaw
Keyword(s):  
Minor Elements

INCO ALLOY G-3

Alloy Digest ◽  
1986 ◽  
Vol 35 (10) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Heat Affected Zone ◽  
Iron Alloy ◽  
Heat Treating ◽  
Minor Elements ◽  
Nickel Chromium ◽  
Inco Alloy

Abstract INCO Alloy G-3 is a nickel-chromium-iron alloy with additions of molybdenum and copper. Some of the minor elements are controlled to provide increased resistance to weld heat-affected zone corrosion. The alloy has exceptional stress-corrosion cracking resistance in chloride-containing environments. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-341. Producer or source: lnco Alloys International.

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