Novel synthesis of ZrB2 powder by low temperature direct molten salt reaction

Velashjerdi, Mohammad; Sarpoolaky, H.; Mirhabibi, A.R.

doi:10.1016/j.ceramint.2015.06.068

Cited by 14 publications

(3 citation statements)

References 23 publications

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“…Moreover, according to Table , the temperature for MSM‐BCTR synthesis of ZrB 2 was only 1200°C, which was almost the lowest among that reported for preparation of ZrB 2 or ZrB 2 –SiC powders by the methodologies based on thermal‐reduction . It was worth noting that, the demanding soaking time of 20 minutes was evidently shorter than not only that (several hours or more) required for conventional BCTR, but also that required even with costly active metals (eg, Mg and Al) or boron as the additional reducing agents. More importantly, the as‐obtained ZrB 2 –SiC powders had well‐defined single‐crystalline anisotropic morphologies as well as the resulting great potential in enhancing the mechanical properties of their bulk counterparts, which was rarely reported for the powder product of thermal‐reduction‐based methodologies.…”

Section: Resultsmentioning

confidence: 95%

Highly‐efficient preparation of anisotropic ZrB₂–SiC powders and dense ceramics with outstanding mechanical properties

et al. 2018

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Highly-dense ZrB 2 -SiC ceramics with excellent mechanical properties including Vickers hardness of 24.5 GPa and fracture toughness of 4.8 MPa/m 1/2 were successfully prepared, by spark plasma sintering of the raw powders synthesized by a novel molten-salt and microwave co-assisted boro/carbothermal reduction (MSM-BCTR) method. Compared with the processing conditions required for synthesizing ZrB 2 -SiC by conventional reduction method, the present MSM-BCTR method possessed a variety of significant merits including the smaller material cost, lower processing temperature (1200°C), and remarkably higher efficiency (soaking time as short as 20 minutes). More importantly, the ZrB 2 -SiC powders, resultant from MSM-BCTR treatment, were verified to have single-crystalline nature and uniform well-grown anisotropic morphologies (rod-like ZrB 2 and sheet-like SiC) as well as great potential in promoting the mechanical properties of their bulk counterparts. This great achievement was mainly ascribed to the specific MSM-BCTR conditions characterized by microwave heating and moltensalt medium.

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Section: Resultsmentioning

confidence: 95%

Highly‐efficient preparation of anisotropic ZrB₂–SiC powders and dense ceramics with outstanding mechanical properties

et al. 2018

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“…It should be emphasized that the preparation conditions (1200 °C/20 min) for phase pure ZrB 2 -SiC powders was almost the lowest according to Table 2, among that reported for synthesizing ZrB 2 or ZrB 2 -SiC by the methodologies based on thermal-reduction process [5,14,15,27,28,29,30,31,32,33,34,35,36,37,38], not only remarkably milder than that (several hours or more) required for conventional BCTR to prepare phase pure ZrB 2 or ZrB 2 -SiC powders, but also that even with costly active metals (e.g., Mg and Al) [30,39] or boron [29,31,35] as the additional reducing agent. Such great enhancement to the synthetic result of ZrB 2 -SiC powders should be attributed to the combined effects of microwave heating and molten-salt medium.…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient and Low-Temperature Preparation of Plate-Like ZrB2-SiC Powders by a Molten-Salt and Microwave-Modified Boro/Carbothermal Reduction Method

et al. 2018

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To address the various shortcomings of a high material cost, energy-intensive temperature conditions and ultra-low efficiency of the conventional boro/carbothermal reduction method for the industrial preparation of ZrB2-SiC powders, a novel molten-salt and microwave-modified boro/carbothermal reduction method (MSM-BCTR) was developed to synthesize ZrB2-SiC powders. As a result, phase pure ZrB2-SiC powders can be obtained by firing low-cost zircon (ZrSiO4), amorphous carbon (C), and boron carbide (B4C) at a reduced temperature of 1200 °C for only 20 min. Such processing conditions are remarkably milder than not only that required for conventional boro/carbothermal reduction method to prepare phase pure ZrB2 or ZrB2-SiC powders (firing temperature of above 1500 °C and dwelling time of at least several hours), but also that even with costly active metals (e.g., Mg and Al). More importantly, the as-obtained ZrB2 particles had a single crystalline nature and well-defined plate-like morphology, which is believed to be favorable for enhancing the mechanical properties, especially toughness of their bulk counterpart. The achievement of a highly-efficient preparation of such high-quality ZrB2-SiC powders at a reduced temperature should be mainly attributed to the specific molten-salt and microwave-modified boro/carbothermal reduction method.

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“…Several techniques have been established for ZrB 2 powder preparation . Solid‐state synthesis such as the self‐propagating high temperature (SHS) technique always produces ZrB 2 in the form of aggregates, which requires being ground by ball milling and attrition milling into the required size.…”

Section: Introductionmentioning

confidence: 99%

ZrB₂ powders with low oxygen content: Synthesis and characterization

Bai

Ni²,

Jin

et al. 2017

Int J Applied Ceramic Tech

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A two-step reduction route is proposed for well-dispersed submicrometer ZrB 2 powder synthesis with low oxygen content. The second synthesis step can reduce the oxygen content apparently, whereas presents minor adverse effects on particle size and dispersion of ZrB 2 powders. The samples were mainly characterized by an oxygen-nitrogen analyzer and X-ray diffractometer (XRD). It can be determined that the adsorbed oxygen constitutes a low proportion of total oxygen content based on the release profile of oxygen and nitrogen contents. Besides, the oxygen content calculated based on XRD characterization is significantly lower than the total oxygen content measured by impulse-thermal conductivity. Furthermore, the lattice constants were determined according to XRD patterns as being higher than the calculated theoretical values based on the First-Principles, indicating that a portion of oxygen remains in ZrB 2 powders in the form of interstitial impurity atoms. K E Y W O R D S borides, oxides, particle size, zirconium/zirconium compounds

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Novel synthesis of ZrB2 powder by low temperature direct molten salt reaction

Cited by 14 publications

References 23 publications

Highly‐efficient preparation of anisotropic ZrB₂–SiC powders and dense ceramics with outstanding mechanical properties

Highly‐efficient preparation of anisotropic ZrB₂–SiC powders and dense ceramics with outstanding mechanical properties

Highly Efficient and Low-Temperature Preparation of Plate-Like ZrB2-SiC Powders by a Molten-Salt and Microwave-Modified Boro/Carbothermal Reduction Method

ZrB₂ powders with low oxygen content: Synthesis and characterization

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Novel synthesis of ZrB2 powder by low temperature direct molten salt reaction

Cited by 14 publications

References 23 publications

Highly‐efficient preparation of anisotropic ZrB2–SiC powders and dense ceramics with outstanding mechanical properties

Highly‐efficient preparation of anisotropic ZrB2–SiC powders and dense ceramics with outstanding mechanical properties

Highly Efficient and Low-Temperature Preparation of Plate-Like ZrB2-SiC Powders by a Molten-Salt and Microwave-Modified Boro/Carbothermal Reduction Method

ZrB2 powders with low oxygen content: Synthesis and characterization

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Highly‐efficient preparation of anisotropic ZrB₂–SiC powders and dense ceramics with outstanding mechanical properties

Highly‐efficient preparation of anisotropic ZrB₂–SiC powders and dense ceramics with outstanding mechanical properties

ZrB₂ powders with low oxygen content: Synthesis and characterization