the critical nitrogen hydrogen ratio was 1: 5 while plasma nitriding at 540 ℃ for 6 h. Und er this condition, no co mpound layer was formed, and acco mpanied with high …Estimated Reading Time: 9 minssp.info Effect of Nitrogen Hydrogen Ratio on The Characteristics ...How to cite this article: Lu Song, Tiantian P, Xiaobin Z,Jing H. Effect of Nitrogen Hydrogen Ratio on The Characteristics and Combined Properties of Plasma Nitriding Layer for 38Crmoal. JOJ Material Sci. 2018; 5(2): 555656. DOI: 10.19080/JOJMS.2018.05.555656. 002 Juniper nline ournal aterial ciencesp.info How are plasma milling and powder refinement related?A combination of heating and high-energy electron bombardment effects produced by the plasma and the mechanical effect of milling are simultaneously induced in plasma milling, which can effectively promote powder refinement, activation, and chemical reaction.See all results for this questionsp.info How is plasma nitriding used in surface hardening?Plasma nitriding is a modern technique for surface hardening of metallic components to improve their service life. Basically, plasma nitriding is a glow discharge process in a mixture of nitrogen and hydrogen gases.See all results for this question
In the glow discharge and electrical potential gradient, the gas becomes ionized and the nitrogen ions are accelerated toward the negatively charged surface. The surface of the heated piece is additionally heated by the plasma.See all results for this questionsp.info When does parabolic growth occur in plasma nitriding?At 823 K, parabolic growth occurs during the first 42 min; then after about 6 h, nitriding saturates at dN = 14 μm. Plasma nitriding is carried out in a glow discharge with the workpiece being the cathode and the vacuum vessel wall being the anode (Berghaus, 1932, 1939 ).See all results for this questionsp.info Effect of nitrogen–hydrogen mixed plasma on nitridation ...In the nitrogen–hydrogen mixed plasma treatment, it was clarified that the mixture of hydrogen with ratio of 10–30% to nitrogen accelerated nitridation of α-Fe nanoparticles.sp.info Effect of carbon/nitrogen ratio and ferric ion on the ...Jan 01, 2020 · Effect of nitrogen to carbon (C/N) ratio on the production (a) evolved gases (b) biohydrogen. The yield of biohydrogen production increased with the increase in C/N ratio, until a drastic drop occurred at C/N ratio of 190, whereby the hydrogen productivity dropped by 47.9% as compared to the optimum ratio.Cited by: 13Publish Year: 2020Author: Mohamad Farizzuan Abdullah, Jamaliah Md Jahim, Peer Mohamed Abdul, Safa Senan Mahmod
We would like to show you a description here but the site won’t allow us.Cited by: 250Publish Year: 2012Author: Vinayan Bhagavathi Parambhath, Rupali Nagar, S. RamaprabhuLearn moresp.info Effects of implantation temperature and volume flow rate ...Effects of implantation temperature and volume flow rate ratio of nitrogen and hydrogen on nitrogen concentration distribution, mechanical properties, fatigue life, fracture toughness, and ...sp.info Plasma Nitriding - an overview | ScienceDirect TopicsThe effect of increasing temperature may then be to change the ratio of oxygen and nitrogen in the layer: plasma nitriding at 550 °C, as compared to 500 °C, produces more nitrides than oxides, a higher hardness, a higher depth of hardening and some diffraction peaks which probably belong to intermetallics at the aluminium–titanium interface ...sp.info Comparison of the effect of argon, hydrogen, and nitrogen ...Oct 07, 2020 · In this study, the effect of the argon, nitrogen, and hydrogen gases on the final properties of the reduced graphene oxide- hydroxyapatite nanocomposites synthesized by gas injected hydrothermal method was investigated. Four samples were synthesized, which in the first sample the pressure was controlled by volume change at a constant concentration.
Apr 30, 2020 · Milling is an essential unit operation used for particle size reduction in solid oral dosage manufacturing. The breakage of particles in a comil is due to the intense shear applied on the particles between impeller and the screen. Breakage also occurs due to the impact from a rotating impeller. Particles exit the mill based on their size relative to the aperture size of the screen bores.sp.info RF PLASMA: from R&D to commercial applicationsammonia, oxygen or nitrogen. To synthesize TN and Si. 3. N. 4 . powders of Ti andSi are used as the raw material. The process is based on the interaction of vaporized Ti or Si with the ionized nitrogen plasma gas. The purity of the initial materials and the RFP are assured by the content of admixtures less than 10-5 %. The contaminations are mostsp.info Evolution of metal nitriding and hydriding reactions ...Oct 15, 2018 · Nanocrystalline metal nitride and hydride powders were prepared using plasma-assisted ball milling in ammonia gas (NH 3-P-milling) via an in situ synthesis reaction.The gas–solid reactions were triggered by a short duration of plasma milling of Mg and Ti under a constant pressure of ammonia gas, and the products in the two systems were nanocrystalline Mg 3 N 2 and TiN, TiH 2 after 10 h ...sp.info Mechanical behavior and microstructure control of the low ...The specific contents of carbon, oxygen, nitrogen and hydrogen in the samples are listed in Table 1. The original oxygen, nitrogen and hydrogen contents were lower than 0.01%, because the purity of the pure Ti was 99.99%. In addition, the theoretical addition of oxygen content were 0.8%, smaller than the actual oxygen content in the sintered ...
Jan 28, 2020 · In 1928, Irving coined the term “plasma” for the new matter state. Lightning and fire are examples of plasma. Plasma can be produced artificially by subjecting some gases to a strong magnetic field or by heating them [11, 12]. The most common gases used for generation of plasma include: air, argon, nitrogen, hydrogen and carbon dioxide.sp.info A Study of the Effect of Nitrogen and Air Plasma Immersion ...A Study of the Effect of Nitrogen and Air Plasma Immersion Ion Implantation Treatments on the Properties of Carbon Fiber ... for a month the O/C ratio at the plasma treated surfaces decreased to 0 ...sp.info Achieving superior hydrogen storage properties of MgH2 by ...Oct 15, 2021 · Multiple catalysts have exhibited high activity on improving the hydrogen storage performance of magnesium hydride. Herein, TiFe as a superior catalyst was successfully prepared, and then doped into MgH 2 via ball milling to improve the de/rehydrogenation properties of MgH 2 at low temperatures. Compared with as-prepared MgH 2, the onset desorption temperature could be …sp.info Effect of Spark-Plasma-Sintering Conditions on Tensile ...Figure 1 shows the morphologies of raw Al (Fig. 1a) and CNT powders (Fig. 1b). The raw Al powder had a teardrop shape with a smooth powder surface and an average diameter of about 20 μm (Fig. 1a). Raw CNTs had a slender shape with a large aspect ratio. The CNTs had an average diameter of about 15 nm and an average length of about 1 μm (Fig. 1b). From the high-resolution TEM image (inset of Fig. 1b), the CNT walls and the axial hollow channel could be observed. After HEBM for 24 h, the carbon and oxyge…See more on link.springer.com
Sep 14, 2017 · However, the effect of nitrogen and hydrogen bonding on the formation and structure of hydroxyapatite is unclear. This study aims to uncover the roles of H and N in tuning Si-O-N surface bioactivity for hydroxyapatite formation. Conformal Si-O-N films were fabricated by plasma-enhanced chemical vapor deposition (PECVD) onto Ti/Si substrates.sp.info Effect of carbon/nitrogen ratio and ferric ion on the ...Request PDF | Effect of carbon/nitrogen ratio and ferric ion on the production of biohydrogen from palm oil mill effluent (POME) | Palm oil mill effluent (POME), the liquid discharge of palm oil ...Estimated Reading Time: 5 minssp.info Metals | Free Full-Text | Plasma Spheroidisation of ...Nov 02, 2021 · Metal powders suitable for use in powder bed additive manufacturing processes should ideally be spherical, dense, chemically pure and of a specified particle size distribution. Ti6Al4V is commonly used in the aerospace, medical and automotive industries due to its high strength-to-weight ratio and excellent corrosion resistance properties. Interstitial impurities in titanium alloys have an ...sp.info Thermal Plasma Spheroidization of High-Nitrogen Stainless ...Feb 16, 2018 · Perhaps the nitrogen losses can be reduced or avoided by adding nitrogen to the plasma or by using a nitrogen–hydrogen mixture as a plasma-forming gas. This question will be researching in the near future. XRD analysis of powders after spheroidization showed the presence of peaks of iron with bcc and fcc lattices (Fig. 8). The results ...
Apr 20, 2016 · Plasma nitriding treatments for titanium alloys are typically carried out at 700–1100°C for 6–80 hours. The atmosphere is composed of a nitrogen containing mixture, for example, N 2, N 2 –Ar, N 2 –H 2, or N 2 –NH 3 mixtures, with pressures that vary in the range of 0.5–1.3 kPa [ 18 – 22 ].sp.info The effect of atmospheric pressure plasma on paper and ...Milling of the pulps resulted in a less compacted pulp with greater surface area. Because atmospheric pressure plasma treatment is a surface process, increased surface area in the relatively unbonded pulp was expected to increase plasma effects for a given density of …sp.info Metals | Free Full-Text | Effect of Ball Size on the ...Oct 13, 2021 · Commercial powders of pure magnesium were processed by high-energy ball milling. The microstructural and morphological evolution of the powders was studied using scanning electron microscopy (SEM), energy dispersive spectrometry (EDX) and X-ray diffraction (XRD). From the results obtained, it was determined that the ball size is the most influential milling parameter. This was …sp.info Applied Sciences | Free Full-Text | Thin Film Gas Sensors ...Oct 17, 2021 · Planetary ball-milled zinc oxide (ZnO) nanoparticle suspensions (nanoinks) were used to produce thin film chemiresistive gas sensors that operate at room temperature. By varying milling or grinding parameters (speed, time, and solvent) different thin film gas sensors with tunable particle sizes and porosity were fabricated and tested with dry air/oxygen against hydrogen, argon, and methane ...
Oct 31, 2016 · Mg–Al alloys were prepared via sintering combined with ball milling, and the effect of a transition metal (TM = Ti, V, Ni) on the hydrogen storage properties of these alloys was investigated; the alloys were characterized via X-ray diffraction, pressure composition isotherms, and differential scanning calorimetry. The results showed that the alloys were mainly composed of Mg and the Mg17Al12 ...sp.info Synthesis of Li2NH Hollow Nanospheres with Superior ...Li2NH hollow nanospheres were prepared by plasma metal reaction based on the Kirkendall effect. In this synthesis, the bulk lithium was vaporized and reacted with ammonia to obtain the hollow nanostructure directly. The electron microscopy results suggested that more than 90% of the obtained hollow nanospheres were in the range 100–200 nm, and the thickness was about 20 nm. In addition, …sp.info Methods of Descaling and Cleaning Titanium and Titanium ...When the ratio is maintained at 10:1, the absorption of hydrogen during the pickling process is minimal. 5.8 In the production of titanium rolled products, the presence of an oxygen-rich layer on the exposed surface under high temperature or oxidizing atmosphere is unavoidable.sp.info Synthesis of Tantalum Hydride Using Mechanical Milling …0.5) were obtained after 20 h of milling. We will discuss the effect of the ball-milling process about formation “in situ” of nanometric tantalum hydrides with metha-nol as a hydrogen source. Keywords Nanometric Ta Hydrides, Mechanical Milling, Methanol Dissociation , XRD, TGA, SEM 1. Introduction
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