ChemInform Abstract: HOT CORROSION OF NICKEL-CHROMIUM ALLOYS IN SULFUR DIOXIDE-OXYGEN ATMOSPHERES. I. CORROSION KINETICS

1976 ◽  
Vol 7 (34) ◽  
pp. no-no
Author(s):  
V. VASANTASREE ◽  
M. G. HOCKING
Keyword(s):  
Sulfur Dioxide ◽  
Hot Corrosion ◽  
Nickel Chromium ◽  
Corrosion Kinetics ◽  
Chromium Alloys

Effect of Aluminising on the Hot Corrosion Resistance of Nickel-Chromium Alloys

2006 ◽  
Vol 514-516 ◽  
pp. 505-509 ◽  
Author(s):  
César A.C. Sequeira ◽  
Fernand D.S. Marquis
Keyword(s):  
Corrosion Resistance ◽  
Molten Salt ◽  
Hot Corrosion ◽  
Xrd Analysis ◽  
Weight Percent ◽  
Test Results ◽  
Nickel Chromium ◽  
Chromium Alloys ◽  
Nial Phase ◽  
Cyclic Corrosion

The effects of aluminising on the hot corrosion resistance of two nickel-chromium alloys containing 10 and 30 weight percent chromium, respectively, were examined. The Ni/Cr specimens were aluminised by pack cementation in Ar and underwent cyclic hot corrosion testing in Na2SO4- NaCl molten salt. XRD analysis indicated that a NiAl phase formed between the coating layer and substrate. Cyclic hot corrosion test results indicated that the effects of aluminising are more pronounced in the case of the 10 % Cr than in the case of 30 % Cr. The ductile NiAl phase suppressed the potential for crack initiation during thermal cycling of the 10 % Cr specimens, and reinforced the hot cyclic corrosion resistance in molten salt for the 30 % Cr specimens.

HREM observation of NiO growth on submicron spheres of pure nickel

1989 ◽  
Vol 47 ◽  
pp. 548-549
Author(s):  
C.M. Teng ◽  
T.F. Kelly ◽  
J.P. Zhang ◽  
H.M. Lin ◽  
Y.W. Kim
Keyword(s):  
Nickel Oxide ◽  
Grain Boundaries ◽  
Pure Nickel ◽  
Submicron Particles ◽  
Crystal Formation ◽  
Nickel Wire ◽  
Liquid Droplets ◽  
Oxide Interface ◽  
Nickel Chromium ◽  
Chromium Alloys

Spherical submicron particles of materials produced by electrohydrodynamic (EHD) atomization have been used to study a variety of materials processes including nucleation of alternative crystallization phases in iron-nickel and nickel-chromium alloys, amorphous solidification in submicron droplets of pure metals, and quasi-crystal formation in nickel-chromium alloys. Some experiments on pure nickel, nickel oxide single crystals, the nickel/nickel(II) oxide interface, and grain boundaries in nickel monoxide have been performed by STEM. For these latter studies, HREM is the most direct approach to obtain particle crystal structures at the atomic level. Grain boundaries in nickel oxide have also been investigated by HREM. In this paper, we present preliminary results of HREM observations of NiO growth on submicron spheres of pure nickel.Small particles of pure nickel were prepared by EHD atomization. For the study of pure nickel, 0.5 mm diameter pure nickel wire (99.9975%) is sprayed directly in the EHD process. The liquid droplets solidify in free-flight through a vacuum chamber operated at about 10-7 torr.

AMETEK 820 ALLOY

Alloy Digest ◽  
1999 ◽  
Vol 48 (3) ◽  
Keyword(s):  
Physical Properties ◽  
Production Process ◽  
Tensile Properties ◽  
Powder Metal ◽  
Nickel Chromium ◽  
Chromium Alloys ◽  
Metal Products ◽  
Specialty Metal

Abstract AMETEK 820 alloy is a powder metallurgically produced strip that is used in hardfacing weld wire. The production process, however, can produce other special strip compositions such as the nickel-chromium alloys used as resistance alloys. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on powder metal forms. Filing Code: Ni-549. Producer or source: AMETEK Specialty Metal Products.

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