Ti-Cr-B-N coatings prepared by pulsed cathodic-arc evaporation of ceramic TiCrB target produced by SHS

et al. 2020

Materials

A novel two-stage technology combining vacuum electro-spark alloying (VESA) and pulsed cathodic arc evaporation (PCAE) was approbated for the deposition of TiC-based coatings in inert (Ar) and reactive (C2H4) atmospheres. The deposition was carried out using a TiC-NiCr-Eu2O3 electrode and 5140 steel substrates. Structural, elemental, and phase compositions of the deposited coatings were investigated by scanning electron microscopy, energy-dispersive spectrometry, and X-ray diffraction. The mechanical properties of the coatings were measured by nanoindentation using a 4 mN load. The tribological properties of the coatings were measured using the pin-on-disc setup in air and in distilled water at a 5 N load. The experimental data suggest that VESA coatings are characterized by surface defects, a hardness of 12.2 GPa, and a friction coefficient of 0.4. To ensure good adhesion between the VESA coating and the upper layer containing diamond-like carbon (DLC), an intermediate layer was deposited by PCAE in the Ar atmosphere. The intermediate layer had a hardness of up to 31 GPa. The upper layer of the coating ensured a low and stable friction coefficient of 0.2 and high wear resistance due to the formation of an sp2–sp3 bound carbon phase. Multilayer TiC-based coating with the upper DLC layer, in addition to high tribological properties, was characterized by the lowest corrosion current density (12 μA/cm2).

Section: Introductionmentioning

confidence: 99%

Two-Layer Nanocomposite TiC-Based Coatings Produced by a Combination of Pulsed Cathodic Arc Evaporation and Vacuum Electro-Spark Alloying

Kiryukhantsev-Korneev

et al. 2020

Materials

“…В настоящей работе были увеличены (в 4 раза) концентрации хрома и никеля по сравнению с предыдущими исследованиями. Перспективным для нанесения покрытий является метод импульсного катодно-дугового испарения [12] с использованием данных электродов, впервые предложенный в работе [14].…”

Section: Introductionunclassified

Tribological Characteristics and Corrosion Resistance of Coatings Obtained by Electrospark Alloying, Pulsed Cathodic Arc Evaporation, and Hybrid Technology Using TiCNiCr and TiCNiCr–Dy2O3 Electrodes

Russ. J. Non-ferrous Metals

Левашов

et al. 2020

Self Cite

С помощью методов электроискрового легирования (ЭИЛ), импульсного дугового испарения (ИДИ) и гибридной техногии ЭИЛ-ИДИ с использованием электродов TiCNiCr и TiCNiCr-Dy 2 O 3 , полученных методом порошковой металлургии, были нанесены одно-и двухслойные покрытия на подложки из стали 40Х. Структура, элементный и фазовый составы электродов и покрытий исследовались с помощью растровой электронной микроскопии, энергодисперсионной спектроскопии и рентгенофазового анализа. Трибологические свойства покрытий определялись в результате испытаний по схеме «стержень-диск» в контакте с контртелом Al 2 O 3 при нагрузках 1, 5 и 10 Н. Температура во время испытаний составляла 20 °C. Потенциал и плотность тока коррозии оценивались с помощью трехэлектродной ячейки с потенциостатом VoltaLab 50. Результаты показали, что электроды состоят из зерен ТiC размером 12 мкм, твердого раствора Ni в Cr и, в случае легированного электрода, -частиц Dy 2 O 3 размером до 5 мкм. ЭИЛ-покрытия имели малодефектную мелкозернистую структуру, состоящую также из областей твердого раствора Ni и Cr в Fe и зерен TiC с максимальным размером 0,3 мкм. Покрытия с добавкой Dy 2 O 3 обладали меньшим коэффициентом трения при нагрузках 1, 5 и 10 Н. Все покрытия при испытаниях в 1N растворе H 2 SO 4 находились в устойчивом пассивном состоянии и обладали высокой коррозионной стойкостью: плотность тока коррозии покрытий минимум в 4 раза была меньше значений, полученных для подложки из стали 40Х. Ключевые слова: TiC, NiCr, Dy 2 O 3 , электроискровое легирование, импульсное катодно-дуговое испарение, покрытия, коэффициент трения, плотность тока коррозии. Сытченко А.Д. -инженер Научно-учебного центра (НУЦ) СВС МИСиС-ИСМАН (119049, г. Москва, Ленинский пр-т, 4).

“…Reactive cathodic arc evaporation has been successfully implemented in various environments such as N 2 and CH x , yielding coatings with enhanced mechanical and tribological characteristics [31][32][33]. The drawbacks of the method, such as the deposition of droplets and the rapid degradation of ceramic cathodes, might be partially or fully alleviated by the application of the pulsed cathodic arc evaporation (PCAE) technique [26,[34][35][36]. In the pulsed power supply mode, the thermal stress and the high-temperature gradients on the cathode, as well as overheating of the substrate are minimized [35,36].…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of Protective Coatings Deposited by Pulsed Cathodic Arc Evaporation in Ar, N2, and C2H4 Environments using the TiC–NiCr–Eu2O3 Cathode

Kiryukhantsev-Korneev

et al. 2019

Coatings

Coatings were deposited by pulsed cathodic arc evaporation (PCAE) of a TiC–NiCr–Eu2O3 cathode fabricated by the powder metallurgy method. The deposition was carried out in different gas media, including Ar, N2, and C2H4. The structure, elemental, and phase compositions of coatings were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), Raman spectroscopy, and glow discharge optical emission spectroscopy (GDOES). Coatings were tested in terms of their hardness, elastic modulus, elastic recovery, friction coefficient, and wear and corrosion resistance. The obtained results demonstrated that the coatings deposited in Ar possessed higher hardness up to 20 GPa and an elastic recovery of 92%. Coatings produced using С2H4 showed the minimum friction coefficient (0.35 ± 0.01). The use of nitrogen as a gas medium led to the formation of coatings with the best corrosion resistance in sulfuric acid. Coatings formed in N2 had a free corrosion potential of +0.28 V and a corrosion current density of 0.012 µA/cm2.