The effect of B<sub>4</sub>C particle size on the reaction process and product in the Cu–Zr–B<sub>4</sub>C system

Huo, Yanqiu; Huang, Min; Fang, Yihang; Wang, Guping

doi:10.1016/j.jascer.2014.10.006

Cited by 7 publications

(10 citation statements)

References 21 publications

(27 reference statements)

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“…It is notable that the diffraction peak of B 4 C is far weaker than Zr or it cannot be detected though the mole percentages of B 4 C and Zr are 25% and 75%, respectively. Similar phenomena also existed in the Cu-B 4 C [20] and Co-B 4 C systems. The relative diffraction intensity formula of phase in the powder mixtures can be described as follows:…”

Section: Dsc Experimentssupporting

confidence: 68%

“…Therefore, increasing B concentration in the Co-Zr-B-C liquid may restrain the presence of Co 2 B or/and ZrCo 3 B 2 in the CS products. In a previous work [20], the effect of B 4 C particle size on the CS process and product in the Cu-Zr-B 4 C system was investigated. Research results showed that increasing B 4 C size will reduce the dissolution rate of B 4 C in Cu-Zr liquid and lead to the incomplete conversion of ZrC and ZrB 2 .…”

Section: Combustion Wave Quenching Experimentsmentioning

confidence: 99%

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In situ synthesis and formation mechanism of ZrC and ZrB₂ by combustion synthesis from the Co-Zr-B₄C system

Huo

Huang

Fang

et al. 2015

Journal of Asian Ceramic Societies

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Please cite this article in press as: M. Zhang, et al., In situ synthesis and formation mechanism of ZrC and ZrB 2 by combustion synthesis from the Co-Zr-B 4 C system, J. Asian Ceram. Soc. (2015), http://dx. a b s t r a c tZrC-ZrB 2 -based composites were prepared by combustion synthesis (CS) reaction from 10 wt.% to 50 wt.% Co-Zr-B 4 C powder mixtures. With increasing Co contents, the particle sizes of near-spherical ZrC and platelet-like ZrB 2 decreased from 1 m to 0.5 m and from 5 m to 2 m, respectively. In addition, the formation mechanism of ZrC and ZrB 2 was explored by the phase transition and microstructure evolution on the combustion wave quenched sample in combination with differential scanning calorimeter analysis. The results showed that the production of ZrC was ascribed to the solid-solid reaction between Zr and C and the precipitation from the Co-Zr-B-C melt, while ZrB 2 was prepared from the saturated liquid. The low B concentration in the Co-Zr-B-C liquid and high cooling rate during the CS process led to the presence of Co 2 B and ZrCo 3 B 2 in the composites. The addition of Co in the Co-Zr-B 4 C system not only prevented ZrC and ZrB 2 particulates from growing, but also promoted the occurrence of ZrC-ZrB 2 -forming reaction.

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Section: Dsc Experimentssupporting

confidence: 68%

Section: Combustion Wave Quenching Experimentsmentioning

confidence: 99%

In situ synthesis and formation mechanism of ZrC and ZrB₂ by combustion synthesis from the Co-Zr-B₄C system

Huo

Huang

Fang

et al. 2015

Journal of Asian Ceramic Societies

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“…The results of the X-ray phase analysis revealed no traces of the starting B 4 C among the products of interaction, indicating the completeness of the reaction course. Similarly, the course of the self-propagating high-temperature synthesis in the Cu-Zr-B-C system produced the particles of ZrB 2 and ZrC in the copper matrix [11]. The in situ formed VB 2 and (Ti,V)B 2 were found by the authors of [12] when obtaining the B 4 C-based composites, by the hot-pressing method involving the powders of B 4 C, TiH 2 , and VC at 2,200 °C.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Our analysis of the scientific literature reveals that the main issue in the formation of coatings based on iron strengthened by Mo x B y in the form of separated inclusions, similar to TiB 2 [6][7][8][9], is the interaction within the Fe-Mo x-B y system. Its result is the formation of a FeMo 2 B 2 phase, which is part of the eutectics with iron, thereby forming a structure that is not optimal in terms of wear resistance, compared to composite [11][12][13]. Therefore, the conventional methods of hardfacing involving electrode materials in the form of master alloys or ferroalloys, which imply the complete melting and recrystallization of the alloy, are not rational for coatings from the Fe-Mo x B y system.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

In situ formation of molybdenum borides at hardfacing by arc welding with flux-cored wires containing a reaction mixture of B4C/Mo

Prysyazhnyuk¹,

Shlapak²,

Ivanov³

et al. 2020

EEJET

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This paper reports a study into the formation of the phase composition, structure, and properties of arc welding coatings by the flux-cored electrode materials from the Fe-MoB -C system. The welding alloys were applied using the flux-cored arc welding (FCAW) electrodes, which consisted of a shell made from the low-carbon steel filled with a reaction powder mixture that contained boron carbide and molybdenum in a ratio of 1:1. The calculation of the phase composition of alloys that correspond to the surfaced layers by a CALPHAD method using the Thermo-Calc OpenCalphad software shows that under the equilibrium conditions the boride phases of molybdenum and ferrite cannot co-exist. The main phase of such alloys is a FeMo 2 B 2 compound, which forms the eutectics with austenite. Given that the eutectic structures with borides are characterized by high brittleness, the introduction of components was conducted in the form of a reaction mixture in order to obtain the in situ formed boride phases in the form of separate structural components. Analysis of the results of studying the microstructure and phase composition of coatings reveals that they consist of three main structural components: the eutectic (FeMo 2 B 2 +ferrite) and the grains of molybdenum tetraboride MoB 4. Thus, under the conditions of arc welding using the reaction mixture, an irregular structure is formed, which is favorable in terms of ensuring wear resistance due to the high microhardness of MoB 4 >27 GPa. The hardness of the coatings obtained is at the level of 63-65 HRC, and the wear resistance is higher compared to standard high-chromium alloys (grades Т620 and Т590) by 2-2.5 times. This makes it possible to recommend the coating of a given system for hardfacing the working surfaces of equipment in the coal, processing, woodworking industries, etc., where abrasive wear is the dominant type of surface wear

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“…4,5) More recently, Yang et al 6) and Zhan et al 7) succeeded in synthesizing Ti(C,N)-TiB 2 composite ceramics through a one-step process of self-propagating high-temperature synthesis (SHS); however, this left a large number of pores in the resulting product. [6][7][8][9] There is, therefore, a need to nd a way of imposing additional pressure in order to improve the relative density of these ceramics.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sintering Temperature on the Microstructure and Properties of Ultra-Fine Ti(C,N)-Based Cermets

Zhao

Zuo

et al. 2016

Mater. Trans.

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Ultra-ne Ti(C,N)-TiB 2 -Co cermets were fabricated from Co, Ti, C, and BN powder mixtures via a reactive hot pressing (RHP) process, and the effect of sintering temperature on their microstructure and properties was explored. An elevated temperature was conducive to the full conversion of Ti(C,N) phase, thus leading to microstructure homogenization and the production of cermets with a high relative density and purity. With increasing temperature, the relative density, hardness, and fracture toughness rst increased, and then decreased. A sample sintered at 1150 C therefore displayed the best overall performance in terms of its maximum relative density and ultra-ne particle size, with relative density, hardness, and fracture toughness of 99.9%, 1947 HV10 and 6.6 MPa.m 1/2 , respectively. Compared with P10 cemented carbide, Ti(C,N)-TiB 2 -Co displayed superior wear resistance because of its higher hardness, as well as the formation of an oxidation layer on the worn surface during dry sliding friction and wear.

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The effect of B₄C particle size on the reaction process and product in the Cu–Zr–B₄C system

Cited by 7 publications

References 21 publications

In situ synthesis and formation mechanism of ZrC and ZrB₂ by combustion synthesis from the Co-Zr-B₄C system

In situ synthesis and formation mechanism of ZrC and ZrB₂ by combustion synthesis from the Co-Zr-B₄C system

In situ formation of molybdenum borides at hardfacing by arc welding with flux-cored wires containing a reaction mixture of B4C/Mo

Effect of Sintering Temperature on the Microstructure and Properties of Ultra-Fine Ti(C,N)-Based Cermets

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The effect of B4C particle size on the reaction process and product in the Cu–Zr–B4C system

Cited by 7 publications

References 21 publications

In situ synthesis and formation mechanism of ZrC and ZrB2 by combustion synthesis from the Co-Zr-B4C system

In situ synthesis and formation mechanism of ZrC and ZrB2 by combustion synthesis from the Co-Zr-B4C system

In situ formation of molybdenum borides at hardfacing by arc welding with flux-cored wires containing a reaction mixture of B4C/Mo

Effect of Sintering Temperature on the Microstructure and Properties of Ultra-Fine Ti(C,N)-Based Cermets

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The effect of B₄C particle size on the reaction process and product in the Cu–Zr–B₄C system

In situ synthesis and formation mechanism of ZrC and ZrB₂ by combustion synthesis from the Co-Zr-B₄C system

In situ synthesis and formation mechanism of ZrC and ZrB₂ by combustion synthesis from the Co-Zr-B₄C system