Results 241 to 250 of about 2,634 (290)

Formation of Aluminum Nitride Films by Gas Nitriding

Key Engineering Materials, 2014
In this study, aluminum alloys were subjected to nitriding at 823 K for 0–18.0 ks using alumina and magnesium powders for improving their radiation performance. After nitriding, aluminum nitride films were formed on the aluminum substrate. The thickness of the formed films varied from 1.5 to 11 μm, and the color of the film surface was dark brown or ...
Masashi Yoshida, Zhou Tao, Noah Utsumi
openaire   +1 more source

Influence of contaminants on gas nitriding

Surface Engineering, 1996
Machining of steels not only affects the shape of the workpiece, but also influences surface structure and composition. At elevated temperatures and pressures during machining or the subsequent cleaning process cooling lubricants, hydraulic oils, machine greases, and cleaning residues can form stable adsorption or reaction layers.
O. Irretier, C. Naber, J. Dong, H. Klumper-Westkamp, B. Haase, K. Bauckhage   +5 more
openaire   +1 more source

Synthesis of Aluminum Nitride Nanopowder by Gas‐Reduction–Nitridation Method

Journal of the American Ceramic Society, 2003
Aluminum nitride (AlN) nanopowder was successfully synthesized from transition alumina nanopowder using an NH 3 –C 3 H 8 gas mixture as a reduction–nitridation agent.
Takayuki Suehiro, Naoto Hirosaki, Ryo Terao, Junichi Tatami, Takeshi Meguro, Katsutoshi Komeya   +5 more
openaire   +1 more source

Gas nitriding – process control and nitriding non-ferrous alloys

Surface Engineering, 2001
This paper, based on the Second Lakhtin Memorial Lecture, gives an overview of the developments in the process control of gas nitriding and describes the current status of nitriding of non-ferrous alloys. Control of the nitriding process involves both thermodynamic and kinetic factors.
B. Reinhold, K. Wilsdorf
openaire   +1 more source

Gas Nitriding and Gas Nitrocarburizing of Steels

2013
AbstractThis article summarizes the terminology for gas reactions, and discusses low-temperature nitriding and nitrocarburizing of stainless steels. It describes the various nitriding processes, namely, high- and low-pressure nitriding, oxynitriding, sulfonitriding, oxysulfonitriding, ferritic nitrocarburizing and austenitic nitrocarburizing.
K.-M. Winter, J. Kalucki
openaire   +1 more source

Mechanochemistry of lithium nitride under hydrogen gas

Physical Chemistry Chemical Physics, 2015
This article unveils reaction paths and chemical kinetics during mechanochemical hydrogenation of lithium nitride, a key material for hydrogen storage.
Z, Li, J, Zhang, S, Wang, L, Jiang, M, Latroche, J, Du, F, Cuevas   +6 more
openaire   +2 more sources

Boron Nitride as a Selective Gas Adsorbent

Langmuir, 1994
A series of eight porous boron nitride materials with nitrogen/BET surface areas of 437-712 m[sup 2]/g have been produced using polymeric precursors varied by systematic synthesis modifications. All samples exhibit type I isotherms indicating that a majority of the porosity occurs in pores with radius less than 1.0 nm.
Jurik F. Janik, William C. Ackerman, Robert T. Paine, Duen-Wu Hua, Alok Maskara, Douglas M. Smith   +5 more
openaire   +1 more source

Brief gas nitriding of structural steels

Metal Science and Heat Treatment, 1977
1. Nitriding in a mixture of 50% NH3+50% natural gas at 570° for 6–8 h ensures formation of a carbonitride layer as thick as 20 μ consisting of e and γ′ phases and a diffusion zone with a thickness ∼0.3 mm. 2. Brief nitriding of steel 40Kh increases the fatigue strength more than twice. 3.
V. V. Goryushin, V. N. Glushchenko, M. E. Duka, G. A. Kondrasheva   +3 more
openaire   +1 more source

Gas Nitriding of Steel Parts

2017
<div class="section abstract"> <div class="htmlview paragraph">This specification covers a process for surface-hardening parts, made from appropriate low-alloy steels (See <span class="xref">8.4</span>), by the introduction of nitrogen from ammonia.</div></div>
openaire   +2 more sources

New methods of gas carburization and nitriding

Metal Science and Heat Treatment, 1984
1 The chief cause of structures of nonmartensitic type forming in the surface layers of case-hardened components is the impaired hardenability of the surface zones of the case because of the depletion of carbon and alloying elements in the austenite as a result of the formation of carbides and their subsequent oxidation and graphitization ...
V. M. Zinchenko, B. V. Georgievskaya, V. A. Olovyanishnikov, V. V. Kuznetsov   +3 more
openaire   +1 more source