Structure and properties of the modified diffusion nitride-oxide surface layer

To combine the processes of gas nitriding and oxidation in water vapor, the effects of the atmospheric nitrogen potential in dissociated ammonia on the formation of surface diffusion nitride phases are studied. Modification of the surface nitride layer with oxygen was carried out by oxidation of the nitride zone at the second stage of obtaining an oxycarbonitride layer. The corrosion and wear-resistant properties of the nitride-oxide layer t of the lowest nitride layer are investigated, depending on the phase changes in the nitride layer after oxidation. The distributions of the elements in the nitride-oxide layer are determined, and the nature of the formation of the modified surface layer under the combination of gas nitriding with subsequent oxidation in water vapor is established.

Download Full-text

Polycrystalline Silocon-Oxide-Nitride-Oxide-Silicon Flash Memory on SiO2 and Si3N4 Buffer Layer for System on Panels Application

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.658.120 ◽

2013 ◽

Vol 658 ◽

pp. 120-123

Author(s):

Sang Youl Lee ◽

Jae Sub Oh ◽

Seung Dong Yang ◽

Ho Jin Yun ◽

Kwang Seok Jeong ◽

...

Keyword(s):

Oxide Layer ◽

Buffer Layer ◽

Flash Memory ◽

Polycrystalline Silicon ◽

Silicon Oxide ◽

Memory Device ◽

Nitride Layer ◽

X Ray Diffraction ◽

X Ray ◽

Nitride Oxide

For the system on panel applications, we fabricated and analyzed the polycrystalline silicon (poly-Si) silicon-oxide-nitride-oxide-silicon (SONOS) memory device on different buffer layer such as oxide or nitride. The threshold voltage (VT) and transconductance (gm) are extracted from each device and the X-Ray Diffraction (XRD) measurement is carried out to interpret these characteristics. The results show the device on oxide layer has higher mobility and lower VT than on nitride layer. From the XRD spectra, it can be explained by the fact that the grain size of poly-Si on oxide layer has larger than on nitride layer. The both devices show program/erase characteristics as the potential of SOP memory devices.

Download Full-text

NITRO-OXIDATION PRODUCTS FROM STRUCTURAL STEELS

International Journal of Advanced Research ◽

10.21474/ijar01/12397 ◽

2021 ◽

Vol 9 (01) ◽

pp. 1105-1113

Author(s):

Kholikul Karshievich Eshkabilov ◽

◽

Sherzod Alimardonovich Berdiev ◽

Asila Olimovna Abdullaeva ◽

◽

...

Keyword(s):

Phase Composition ◽

Water Vapor ◽

Oxide Layer ◽

Diffusion Coating ◽

Surface Characteristics ◽

Structural Steels ◽

Oxidation Products ◽

Second Stage ◽

Coating Composition ◽

Nitride Oxide

The article examines the technology of nitro-oxidation, which consists of nitriding in separated ammonia at the first organize and oxidation in water vapor at the second stage of the process, studied the structure and phase composition of the diffusion nitride-oxide layer, providing high physico-mechanical and physicochemical surface characteristics, competitively capable of galvanic strategies of getting a coating, the conceivable outcomes of regulating the structure and phase composition of the nitride-oxide layer are being investigated to obtain a diffusion coating composition with predetermined properties.

Download Full-text

Compositional Determinations of Oxide-Nitride-Oxide Stacked Dielectric

MRS Proceedings ◽

10.1557/proc-268-197 ◽

1992 ◽

Vol 268 ◽

Author(s):

G.L. Waytena ◽

J. Hren ◽

J.K. Weiss ◽

P. Rez ◽

G.G. Fountain ◽

...

Keyword(s):

Energy Loss ◽

Oxide Layer ◽

Spatial Resolution ◽

Silicon Oxide ◽

Nitrogen Concentration ◽

Light Element ◽

Nitride Layer ◽

Electron Holography ◽

Computer Controlled ◽

Nitride Oxide

ABSTRACTElectron holography, and high spatial resolution (17Å) computer controlled Parallel Electron Energy Loss Spectrometry (PEELS) were used to probe the structure of and chemical profile across a thin silicon Oxide-Nitride-Oxide (ONO) layered structure of nominal width 10Å-50Å-10Å. We found that the layer widths are on the average 13Å-28Å-18Å, the first oxide layer was discontinuous, and the second oxide layer contained nitrogen. The nitride layer had a silicon to nitrogen concentration ratio of 1.0 ± 0.1. These results show, for the first time, the power of holography in characterizing thin, light element, amorphous layers and the importance of computer controlled parallel energy loss line scans for obtaining analytical information at the highest spatial resolution with minimum dose.

Download Full-text

Intergranular corrosion at a modified surface layer in a supermartensitic stainless steel for chemical injection mandrel

Engineering Failure Analysis ◽

10.1016/j.engfailanal.2021.105390 ◽

2021 ◽

pp. 105390

Author(s):

S.S.M. Tavares ◽

H.L.A. Keide ◽

P. S. P. Garcia ◽

J.A.C.Velasco ◽

J.M. Pardal ◽

...

Keyword(s):

Stainless Steel ◽

Surface Layer ◽

Intergranular Corrosion ◽

Supermartensitic Stainless Steel ◽

Modified Surface ◽

Modified Surface Layer

Download Full-text

Oxidation Behavior of Maraging 300 Alloy Exposed to Nitrogen/Water Vapor Atmosphere at 500 °C

Metals ◽

10.3390/met11071021 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1021

Author(s):

Mauro Andres Cerra Florez ◽

Gemma Fargas Ribas ◽

Jorge Luiz Cardoso ◽

Antonio Manuel Mateo García ◽

Joan Josep Roa Rovira ◽

...

Keyword(s):

Water Vapor ◽

Oxide Layer ◽

Magnetic Layer ◽

Adhesive Force ◽

Point Of View ◽

Maraging Steels ◽

Cobalt Spinel ◽

Water Vapor Atmosphere ◽

Iron Nickel ◽

Ferrite Cobalt

Aging heat treatments in maraging steels are fundamental to achieve the excellent mechanical properties required in several industries, i.e., nuclear, automotive, etc. In this research, samples of maraging 300 alloy were aged using a novel procedure that combines different steps with two atmospheres (nitrogen and water vapor) for several hours. The oxidized surface layer was chemical, microstructural and micromechanically characterized. Due to the thermodynamic and kinetic conditions, these gases reacted and change the surface chemistry of this steel producing a thin iron-based oxide layer of a homogeneous thickness of around 500 nm. Within the aforementioned information, porosity and other microstructural defects showed a non-homogeneous oxide, mainly constituted by magnetite, nickel ferrite, cobalt ferrite, and a small amount of hematite in the more external parts of the oxide layer. In this sense, from a chemical point of view, the heat treatment under specific atmosphere allows to induce a thin magnetic layer in a mixture of iron, nickel, and cobalt spinel ferrites. On the other hand, the oxide layer presents an adhesive force 99 mN value that shows the capability for being used for tribological applications under sliding contact tests.

Download Full-text

Investigation of nitrogen ionization state and its effect on the nitride layer during fiber laser gas nitriding of Ti-6Al-4V alloy

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2021.127254 ◽

2021 ◽

pp. 127254

Author(s):

Jinchang Guo ◽

Yu Shi ◽

Chunkai Li ◽

Gang Zhang

Keyword(s):

Fiber Laser ◽

Nitride Layer ◽

Ionization State ◽

Gas Nitriding

Download Full-text

A Mössbauer study of spin-pinning in the oxide surface layer on fine iron particles

Hyperfine Interactions ◽

10.1007/bf02396521 ◽

1992 ◽

Vol 68 (1-4) ◽

pp. 405-408

Author(s):

Runsheng Huang ◽

Hongqi Xiong ◽

Qingyou Lu ◽

Yuanfu Hsia ◽

Rongchuan Liu ◽

...

Keyword(s):

Surface Layer ◽

Oxide Surface ◽

Iron Particles ◽

Mössbauer Study ◽

Fine Iron

Download Full-text

Improving the mechanical properties of tool steel by induction chemical-thermal treatment

Journal of Physics Conference Series ◽

10.1088/1742-6596/2086/1/012200 ◽

2021 ◽

Vol 2086 (1) ◽

pp. 012200

Author(s):

P Palkanov ◽

V Koshuro ◽

A Fomin

Keyword(s):

Mechanical Properties ◽

Surface Layer ◽

Thermal Treatment ◽

Tool Steel ◽

High Speed ◽

Nitride Layer ◽

Surface Microhardness ◽

Gaseous Nitrogen ◽

Gradient Diffusion ◽

Study Results

Abstract The study results of the structure and microhardness of the surface layer of high-speed tool steel after induction chemical-thermal treatment in a gaseous nitrogen-containing medium at a temperature of 900–1100 °C were presented. Due to the strengthening treatment of products a gradient diffusion nitride layer with a thickness of about 200 μm and a surface microhardness of 1950±70 HV1 98 was formed.

Download Full-text

The laboratory tests of hybrid layers combining hardfacing and nitriding dedicated to increase the durability of forging tools in hot forging processes

Welding Technology Review ◽

10.26628/wtr.v91i2.1020 ◽

2019 ◽

Vol 91 (2) ◽

Cited By ~ 2

Author(s):

Paweł Widomski ◽

Zbigniew Gronostajski ◽

Marcin Kaszuba ◽

Jagoda Kowalska ◽

Mariusz Pawełczyk

Keyword(s):

Surface Layer ◽

Chemical Composition ◽

Laboratory Tests ◽

Hot Forging ◽

Composition Analysis ◽

Wear Resistant ◽

Gas Nitriding ◽

Use Wear ◽

Different Types ◽

Hybrid Layers

In response to the growing need to use wear-resistant layers that increase durability of tools in forging pro-cesses, hybrid layers have been proposed that combine hardfacing with nitriding treatment. This article presents the results of laboratory tests of surface wear-resistant layers made with a new hybrid technology Gas-Shielded Metal Arc surfacing (hardfacing) with ZeroFlow gas nitriding. Specimens made with hardfacing or nitriding were prepared and examined. Analysis covered the thorough microstructure study, EDX chemical composition analysis and microhardness analysis. In experiment, 3 different types of nitrided layers were proposed for alpha, gamma prim and epsilon nitrides in the surface layer. The results of metallographic research in the surface layer was presented. The analysis of chemical composition in the particular overlay welds was performed to determine the content of alloying elements in the particular overlay welds. The susceptibility to nitriding of used weld materials as well as the ability to form particular types of nitrides on selected welded substrates was also tested.

Download Full-text