Properties of Nickel Powder Alloys Hardened with Titanium Carbide

The effect of reduction treatment in a high-temperature (600 °C) hydrogen-containing environment on the microstructure and tendency to brittle fracture of YSZ-NiO(Ni) materials for solid oxide fuel cell anodes has been studied. To assess the crack growth resistance of the ceramics, the Vickers indentation technique was adapted, which allowed estimating the microhardness and fracture toughness of the material in the complex. The requirements for high porosity of the anodes to ensure functional properties show that the strength may be an insufficient characteristic of the bearing capacity of the anode. More structurally sensitive characteristics are needed to assess its crack growth resistance. The average levels of microhardness of YSZ-NiO ceramics in the as-sintered state and YSZ-NiO(Ni) cermets(2.0 GPa and 0.8 GPa, respectively) and their fracture toughness (3.75 MPa•m 1/2 and 2.9 MPa•m 1/2 , respectively) were experimentally determined. It was found that the microstructure of YSZ-NiO(Ni) cermet after redox treatment is formed by a YSZ ceramic skeleton with refined Ni-phase grains combined in a network, which provides increased electrical conductivity. Along with higher porosity of the cermet, its fracture toughness is not lower than that of the one-time reduced cermet due to the implementation of the bridging toughening mechanism of fracture.The proposed treatment method allowed forming the microstructure of the anode material, resistant to crack propagation under mechanical load. The propensity of the anode material to brittle fracture on the basis of evaluation of its crack growth resistance and analysis of the microstructure and fracture micromechanism was substantiated. This result is interesting from a theoretical point of view. From a practical point of view, the developed technique allows determining the conditions of redox treatment in the technology of manufacturing fuel cell anodes

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“…od of determining the porosity by analyzing their microstructure [33], successfully tested by the authors of the works [34].…”

Section: Characteristics Of the Materials And Features Of The Research Methods Usedmentioning

confidence: 99%

Estimation of the effect of redox treatment on microstructure and tendency to brittle fracture of anode materials of YSZ–NiO(Ni) system

Vasyliv

Kulyk

Duriagina

et al. 2020

EEJET

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“…У техніці велика кількість деталей працює за високих навантажень і температур. Для забезпечення їхньої зносостійкості широкого поширення набули покриття на основі жаростійких евтектичних матеріялів [1][2][3][4]. Перспективним способом формування таких покриттів є плазмово-дугове напорошування (ПДН).…”

Section: вступunclassified

Formation of Microstructure of Plasma-Arc Coatings Obtained Using Powder Wires with Steel Skin and B$_4$C+(Cr,Fe)$_7$С$_3$+Al Filler

Hryhorenko¹,

Adeeva²,

Tunik³

et al. 2020

Metallofiz. Noveishie Tekhnol.

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Проаналізовано процеси фазової взаємодії, що відбуваються під час високошвидкісного плазмово-дугового напорошування (ПДН) між сталевою оболонкою і порошковим наповнювачем дроту (70B 4 C + 20(Cr, Fe) 7 C 3 + + 10Al % мас.). Встановлено спрямованість термодинамічних реакцій між компонентами дроту з утворенням нових фаз (бороцементиту, бориду заліза) із застосуванням методу диференційного термічного аналізу. Нанесення покриттів проводили за допомогою установки PLAZER 30PL-W, розробленої в Інституті електрозварювання імені Є. О. Патона, в середовищі інертного газу арґону. Дослідження фазового складу вихідних матеріялів і одержаних покриттів виконували за допомогою дифрактометра ДРОН-УМ1. Диференційний термічний аналіз проводили за допомогою установки ВДТА-8М в середовищі гелію. Мікроструктуру покриттів про-

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“…These materials have excellent high-temperature strength and chemical inertness and can operate under high pressure or vacuum, high temperature, radiation, corrosion, etc. [1][2][3][4][5][6][7][8][9][10]. State-of-the-art Ti-based composites possessing high strength and fracture toughness in a temperature range 20-650 °C have an advantage over traditional cast or deformed titanium alloys, for which an operating temperature is limited by 350-450 °C.…”

Section: Introductionmentioning

confidence: 99%

THE EFFECT OF ULTRA-FINE ALLOYING ELEMENTS ON THE PHASE COMPOSITION, MICROSTRUCTURE, HIGH-TEMPERATURE STRENGTH AND FRACTURE TOUGHNESS OF Ti–Si–X AND Ti–Cr–X COMPOSITES

Kulyk

Vasyliv

Duriagina

et al. 2022

Acta Metall Slovaca

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Advanced Ti-based composites are promising for applications in components of modern aircraft and rocket engines as well as other power equipment owing to their high strength-to-weight ratio and fracture toughness in a temperature range of 20 °C to 650 °C. However, there is a need to increase their operating temperature range up to 700−800 °C. In this work, mechanical behavior of Ti–Si–X composites (X=Al and/or Zr, Sn, C) has been studied. For comparison, mechanical behavior of Ti–Cr–X composite (X=Al and/or C) has been studied. As-cast and thermo-mechanically deformed series of beam specimens were examined. Strength tests of specimens were performed under three-point bending in a temperature range of 20 °C to 1000 °C. Single-edge notch beam (SENB) tests under three-point bending of specimen series were carried out in a temperature range of 20 °C to 900 °C for estimating fracture toughness of materials. Based on the constructed dependences of fracture toughness and strength on testing temperature for the specimen series as well as the microstructure and failure micromechanism analyses, the role of ultra-fine alloying elements in achieving good high-temperature strength and fracture toughness of the studied composites was substantiated.

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Properties of Nickel Powder Alloys Hardened with Titanium Carbide

Cited by 18 publications

References 2 publications

Estimation of the effect of redox treatment on microstructure and tendency to brittle fracture of anode materials of YSZ–NiO(Ni) system

Estimation of the effect of redox treatment on microstructure and tendency to brittle fracture of anode materials of YSZ–NiO(Ni) system

Formation of Microstructure of Plasma-Arc Coatings Obtained Using Powder Wires with Steel Skin and B$_4$C+(Cr,Fe)$_7$С$_3$+Al Filler

THE EFFECT OF ULTRA-FINE ALLOYING ELEMENTS ON THE PHASE COMPOSITION, MICROSTRUCTURE, HIGH-TEMPERATURE STRENGTH AND FRACTURE TOUGHNESS OF Ti–Si–X AND Ti–Cr–X COMPOSITES

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