Combustion of Metals in Oxygen-Enriched Atmospheres

Shao, Lei; Xie, Guoliang; Zhang, Cheng; Liu, Xiao; Lu, Wanran; He, Guangyu; Huang, Jinfeng

doi:10.3390/met10010128

Cited by 12 publications

(3 citation statements)

References 58 publications

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“…The part of the substrate that is not coated will be exposed to heat during coating. Thus, the substrate is oxidized to form Fe2O3 [30]. In addition, there are cracks that are certainly not expected here as they will reduce the binding strength of the layers.…”

Section: Xrd and Sem-eds Analysis Of Flame Sprayed Nanohydroxyapatite...mentioning

confidence: 90%

Gas pressure and coating distance for nanohydroxyapatite deposition on stainless steel 316L using flame spray technique

et al. 2021

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Metal implant coating engineering is needed to improve the surface biocompatibility properties of metals. For this, coating metal surfaces with bioactive and biocompatible biomaterials will be an option. Having high biocompatibility as well as similarity in chemical properties, nanohydroxyapatite may be a candidate as biomaterials for coating the metal implant. The key to the success of metal implant plating is the formation of pores which increase the bioactivity and biocompatibility properties of the implant. In this study, nanohydroxyapatite was used to be coated on stainless steel type 316L (SS316L). To ensure that the coating works properly on the surface, an appropriate measure of gas and distance is required. The purpose of this study was to determine the possible firing distance and gas pressure of the flame spray coating technique. The X-ray diffractometer (XRD), scanning electron microscope - energy dispersive X-ray spectroscopy (SEM-EDS), and optical microscopy (OM) characterizations were carried out to determine the phase, morphology, and presence of pores. After coated product, hydroxyapatite dehydroxylation occurred which led to the tetracalcium phosphate (TTCP) and β-tricalcium phosphate (β-TCP) phases. The thickness decreases with the addition of gas pressure and the farther the firing distance the layer thickness decreases. Nanohydroxyapatite coating on a bone implant substrate can increase the porosity of the layer.

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Section: Xrd and Sem-eds Analysis Of Flame Sprayed Nanohydroxyapatite...mentioning

confidence: 90%

Gas pressure and coating distance for nanohydroxyapatite deposition on stainless steel 316L using flame spray technique

et al. 2021

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“…The PIC tests that were carried out were wildly used in oxygen-enriched atmosphere, and the test procedures are described in detail in reference [3]. The variations of temperature during the combustion process were recorded by using thermal imaging (MCS640, LUMASENSE TECHNOLOGIES, Santa Clara, CA, USA).…”

Section: Promoted Ignition-combustion (Pic) Testmentioning

confidence: 99%

“…Titanium alloys are regarded as promising structural materials in the aero industry due to their superior properties, such as low density, high specific strength, and high corrosion resistance, etc., [1]. However, they also suffer from risk of combustion in harsh conditions, such as oxygen-rich atmosphere or friction at elevated temperatures [2,3]. Due to the high combustion heat and low thermal conductivity of titanium, once these alloys are ignited, the combustion reaction can scarcely be extinguished and it spreads to the whole component in less than 30 s, which is known as "titanium fire" [4].…”

Section: Introductionmentioning

confidence: 99%

Combustion Behavior and Microstructure of TC17 Titanium Alloy under Oxygen-Enriched Atmosphere

Zhang,

Xing,

et al. 2023

Metals

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TC17 titanium alloy is widely used in the aerospace industry, but its combustion behavior and microstructure after combustion are rarely investigated. Herein, the ignition critical oxygen pressure, combustion velocity, and microstructure after the combustion of TC17 titanium alloy were investigated by promoted ignition combustion tests under an oxygen-enriched environment. The results indicated that there were three stages, ignition, splash, and flame propagation, for the combustion process of the TC17 alloy. As compared to TC11 titanium alloy, the TC17 titanium alloy exhibited a similar ignition critical oxygen pressure with the same size, but an obviously faster burning rate, which followed a power law relationship with the oxygen pressure. The segregation of Cr, Mo, and Al was observed in the interdendritic phase of the melting zone and the interface between the melting zone and the heat-affected zone. The segregation of Cr at the liquid/solid interface can be responsible for accelerating the burning kinetic of the TC17 alloy by decreasing the interfacial temperature.

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The Role of Target Melting in Particle Impact Ignition with Inert Particulate

Taylor,

Eswarappa Prameela,

Tylka

et al. 2024

JOM

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The high gas temperatures and oxygen pressures in the turbine of oxygen-rich turbomachinery put conventional engineering alloys such as IN718 at risk of particle impact ignition, i.e., metal fires initiated when particulate strikes a solid surface. The standard model of particle impact ignition assumes that the impacting particle must first ignite in order to kindle to the target material. Here, we invalidate this belief through particle impact ignition experiments which show that IN718 can ignite when struck by inert Al2O3 particles with supersonic impact velocities. Through post-mortem analysis of non-ignited samples, we find that subsonic particle impact causes minimal crater damage whereas supersonic particle impact leaves extensive crater plasticity and pileup, with evidence of molten ejecta near the impact site. Complementary finite element simulations of supersonic impact events confirm extreme adiabatic heating and localized melting. These findings demonstrate that particle impact can drive target ignition even in the absence of particle burning provided the thermal excursion at impact exceeds the melting point of the target material.

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Combustion of Metals in Oxygen-Enriched Atmospheres

Cited by 12 publications

References 58 publications

Gas pressure and coating distance for nanohydroxyapatite deposition on stainless steel 316L using flame spray technique

Gas pressure and coating distance for nanohydroxyapatite deposition on stainless steel 316L using flame spray technique

Combustion Behavior and Microstructure of TC17 Titanium Alloy under Oxygen-Enriched Atmosphere

The Role of Target Melting in Particle Impact Ignition with Inert Particulate

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