The effect of carbon on phase composition and microstructure of cermets based on Mo2NiB2 boride

Vershinina, T. N.; Иванов, М. Б.; Rimsha, P.B.

doi:10.1016/j.ijrmhm.2021.105650

Cited by 8 publications

(2 citation statements)

References 23 publications

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“…Transition-metal (TM) borides have been attracting considerable interest in recent years for their potential applications in extreme environments. − They are considered as good candidate materials for the main components of hypersonic vehicles and scramjet engines due to their good thermal conductivity, high melting point, high hardness, and so forth. The possible origins of these superior properties are due to the fact that the chemical bonds in these borides are extremely complicated with localized nonmetal-to-nonmetal, metal-to-nonmetal, or metal-to-metal interactions resembling both covalent and metallic bonds.…”

Section: Introductionmentioning

confidence: 99%

Tantalum Diboride: The Superhard and Metallic Boride

Cui

2022

Crystal Growth & Design

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Understanding the intrinsic properties of metal borides is an attractive research topic in materials science. Here, we perform a computational study on the indentation shear strengths and the atomic-scale structural changes of TaB2 under indentation shear deformations based on the CALYPSO method and first-principles calculations. Abnormal strain-stiffening behaviors are found in both hexagonal P6/mmm and orthorhombic Cmmm phases of TaB2 due to the TaB12 hexagonal prisms combined with the adjacent Ta–Ta metallic bonds along the [110] direction that form a robust three-dimensional configuration, which resists the large shear deformations under Vickers indentation loading conditions. Our calculations show that the indentation shear strengths of both P6/mmm and Cmmm phases of TaB2 credibly exceed the 40 GPa threshold for superhard materials. These findings provide powerful guidelines for future experiments to synthesize and design the ideally orientated TaB2 samples and other new kinds of superhard materials.

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Section: Introductionmentioning

confidence: 99%

Tantalum Diboride: The Superhard and Metallic Boride

Cui

2022

Crystal Growth & Design

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“…Meanwhile, with the development of industrial materials, borides, especially ternary borides, have attracted more attention because of their excellent properties. Their high melting point, perfect hardness, excellent wear resistance, good corrosion resistance, and superior resistance to high-temperature oxidation make them a remarkable material in industrial applications [16][17][18][19][20]. The prepared Mo 2 FeB 2 coating can be applied in cutting tools and other machine parts.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis for Process Parameters in Mo2FeB2 Ternary Boride Coating by Laser Cladding

et al. 2022

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The process parameters of laser cladding have a significant influence on the forming quality of the coating. This research investigates the relationship between input process parameters (laser power, scanning speed, pre-placed thickness) and output responses (height, width, dilution rate) of Mo2FeB2 coating through sensitivity analysis. The microstructure and properties of selected coatings were analyzed to discuss the corresponding relations. The results showed that the laser power positively affected the coating width and dilution rate, while negatively affecting the coating height. The scanning speed had a negligible effect on the height and dilution rate. The pre-placed thickness had a positive influence on the height and width; it negatively affected the dilution rate. Based on the sensitivity analysis, the thickness of the pre-placed coating determined the most sensitivity to the height. The sensitivity of the width to laser power was the highest among all parameters. The sensitivity of dilution rate to laser power and pre-placed powder thickness showed a noticeable impact. When the scanning speed was 3 mm/s, the forming quality of coating had a significant sensitivity for a higher or lower laser power (1.5, 2.1 kW) and higher or lower powder thickness (0.8, 1.2 mm). The analysis of microstructure and microhardness of Mo2FeB2 coating indicates that the Mo2FeB2 coating improves substrate properties. The microhardness of the Mo2FeB2 coating was 4–6 times that of the substrate, and the highest microhardness could be obtained by 1.5 kW laser power, 3 mm/s scanning speed, and 1.2 mm powder thickness from the sensitivity analysis results.

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Effects of carbon content on the microstructure and mechanical properties of MoCoB–Co cermets

Yang,

Zeng,

et al. 2024

Ceramics International

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The effect of carbon on phase composition and microstructure of cermets based on Mo2NiB2 boride

Cited by 8 publications

References 23 publications

Tantalum Diboride: The Superhard and Metallic Boride

Tantalum Diboride: The Superhard and Metallic Boride

Sensitivity Analysis for Process Parameters in Mo2FeB2 Ternary Boride Coating by Laser Cladding

Effects of carbon content on the microstructure and mechanical properties of MoCoB–Co cermets

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