Researches Structure and Properties of Self-Fluxing Coating, Obtained by Air-Plasma Spraying

Kornienko, Elena; Smirnov, A. I.; Кузьмин, В. С.

doi:10.4028/www.scientific.net/amm.698.405

Cited by 11 publications

(5 citation statements)

References 6 publications

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“…Some of the particles were heated above the melting temperature during spraying (Area B in Fig. 1,a) [13,17]. It led to the formation of a homogeneous melt, and a high rate of crystallization led to the fixation of a supersaturated solid nickel base solution.…”

Section: Research Results and Discussionmentioning

confidence: 99%

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The Effect of Heat Temperature on the Structure of Plasma Coating of the Ni-Cr-Si-B System

Kornienko

Никулина

Drobyaz

et al. 2015

AMM

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The powder of the Ni-Cr-Si-B system was applied on tubes of low carbon steel (0.2 % C) with the help of air-plasma spraying. The effect of heating temperature on the microstructure of obtained coatings was analyzed in this paper. The coatings were heated up to 500, 600, 700, 800, 900, 1000, and 1100 °C and cooled in the air. It was shown by the method of optical and scanning electron microscopy (SEM) and the X-ray diffraction analysis (XRD) that the same phases (γ-Ni, Ni3B, Ni3Si and Cr2B) were present in the coatings before and after heating. Chromium carbide Cr7C3 was observed in the coating structure after heating to above 1000 °C. Coatings which were heated to 1000 °C consisted of grains of the solid nickel base solution, micro volumes of the Ni+Ni3Si eutectic with inclusions of Ni3B and particles of Cr7C3. The coatings which were crystallized from a liquid state (heated up to 1100 °C) consisted of large areas of the solid nickel base solution and particles of chromium carbide Cr7C3. The space between nickel areas is filled by the Ni3Si+Ni3B eutectic.

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Section: Research Results and Discussionmentioning

confidence: 99%

“…The internal diameter of tube was 25 mm and the wall thickness was 3 mm. The chemical composition of the sprayed powder Ni77Cr15Si3B2 is shown in Earlier, it was shown that optimum modes of plasma spraying of selected powders were the following: current -140 A and voltage -265 V [13]. The spraying distance was 170 mm.…”

Section: Materials and Research Methodsmentioning

confidence: 99%

The Effect of Heat Temperature on the Structure of Plasma Coating of the Ni-Cr-Si-B System

Kornienko

Никулина

Drobyaz

et al. 2015

AMM

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“…It was revealed by microhardness measuring that the hardness of sintering material is less than coating (650 and 850 MPa, respectively). The study [34] by local microhardness measuring demonstrated that particles hardness changing depends on particles type. The slightly deformed particles have the smallest microhardness (600…700 HV).…”

Section: Resultsmentioning

confidence: 99%

Structural features of Ni-Cr-Si-B materials obtained by different technologies

Kornienko

Никулина

Belousova

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. This study considers the structural features of Ni-Cr-Si-B (Ni -base; 15.1 % Сr; 2 % Si; 2 % В; 0.4 % С) materials obtained by different methods. The self-fluxing coatings were deposited by plasma spraying on the tubes from low carbon steel. Bulk cylinder specimens of 20 mm diameter and 15 mm height were obtained by spark plasma sintering (SPS). The structure and phase composition of these materials were investigated by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffractometry (XRD). The major phases of coatings and sintered materials are γ-Ni, Ni3B, CrB and Сr7С3. We demonstrate that the particle unmelted in the process of plasma spraying or SPS consist of γ-Ni-Ni3B eutectic and also CrB and Сr7С3 inclusions. The prolonged exposure of powder to high temperatures as well as slow cooling rates by SPS provide for the growth of the structural components as compared to those of plasma coatings materials. High cooling rates at the plasma spraying by melted particles contribute to the formation of supersaturated solid solution of Cr, Si and Fe in γ-Ni. The structure of the melted particles in sintering material has gradient composition: the core constituted of Ni grains of 10 μm with γ-Ni-Ni3B eutectic on the edges. The results of the experiment demonstrate that the sintering material has a smaller microhardness in comparison with plasma coatings (650 and 850 MPa, respectively), but at the same time the material has higher density (porosity less than 1 %) than plasma coatings (porosity about 2…3 %).

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“…The higher speed of the powder particles ensures a smaller grain size of the metal or ceramic in the coating. Thus, high-speed plasma deposition modes allow obtaining metastable states of coating materials with a nanoscale crystal structure [21].…”

Section: Supersonic Plasma Torch For Spraying Powder Materialsmentioning

confidence: 99%

The Structure and Characteristics of Wear-Resistant Coatings, Obtained by Supersonic Plasma Spraying

Кузьмин¹,

Gulyaev²,

Sergachev³

et al. 2022

KEM

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The characteristics of coatings designed to protect against cavitation and waterjet wear, obtained by supersonic atmospheric plasma spraying using air as a plasma-forming gas, are studied. The following powder materials were selected for coating: WC/10Co4Cr; Ni-Cr-B-Si-C; Ni-Al; Ni-Ti; bronze. Metallographic studies of the structures of specimens with applied coatings and measurements of their microhardness were carried out. Due to the fact that the tests of materials for hydroabrasive wear are not standardized, studies were carried out on the resistance of coatings to dry abrasive wear according to the ASTM G65-04 standard and to dry reciprocating friction according to the ASTM G133 standard. The conducted studies of the structures of the sprayed coatings suggest that the use of supersonic deposition modes guarantees the production of high-density coatings with a porosity of less than 1 %.

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Researches Structure and Properties of Self-Fluxing Coating, Obtained by Air-Plasma Spraying

Cited by 11 publications

References 6 publications

The Effect of Heat Temperature on the Structure of Plasma Coating of the Ni-Cr-Si-B System

The Effect of Heat Temperature on the Structure of Plasma Coating of the Ni-Cr-Si-B System

Structural features of Ni-Cr-Si-B materials obtained by different technologies

The Structure and Characteristics of Wear-Resistant Coatings, Obtained by Supersonic Plasma Spraying

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