Preparation and characterization of ZrB2–SiC composite powders from zircon via microwave-assisted boro/carbothermal reduction

Deng, Xiangong; Du, Shuang; Zhang, Haijun; Li, Faliang; Wang, Junkai; Zhao, Wanguo; Liang, Feng; Huang, Zhong; Zhang, Shaowei

doi:10.1016/j.ceramint.2015.07.077

Cited by 44 publications

(15 citation statements)

References 30 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.…”

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%

“…For example, Krishnarao [14] prepared ZrB 2 -SiC powders by firing a mixture of zircon, C and B 4 C, although a high processing temperature of 1600 °C was required. In our previous work [15], zircon, C, and B 2 O 3 were used to prepare uniformly distributed ZrB 2 -SiC powders at the relatively lower temperature of 1300 °C for 3 h via a novel microwave-modified BCTR approach. However, it should be emphasized that it is still a challenging task to control the morphology of the ZrB 2 -SiC powders resulting from the conventional reduction process.…”

Section: Introductionmentioning

confidence: 99%

“…In this respect, several advanced techniques employing microwave and molten salt were utilized to modify the conventional reduction method for synthesizing ZrB 2 -SiC powder [5,15,16]. On the one hand, molten salt is capable of providing the expected synthetic reactions with a liquid medium, thus facilitating homogeneous mixing, accelerating the diffusion of reactants, and enhancing the synthesis and crystal growth of products to form a well-defined anisotropic morphology [17,18].…”

Section: Introductionmentioning

confidence: 99%

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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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“…Jalaly et al [20] reported mechano-synthesis of nano composite of ZrB 2 -SiC-ZrC by magnesiothermic self-sustaining reaction using Mg/B 2 O 3 /ZrSiO 4 /C system. Recently, preparation of ZrB 2 -SiC composite powders from zircon (ZrSiO 4 ), activated carbon (C), and boron oxide (B 2 O 3 ) via microwave-assisted reduction was reported [21].…”

Section: mentioning

confidence: 99%

Thermite assisted synthesis of ZrB2 and ZrB2–SiC through B4C reduction of ZrO2 and ZrSiO4 in air

Krishnarao

Sankarasubramanian

2017

J Adv Ceram

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ZrB 2 and ZrB 2 -SiC powders have been produced by reducing ZrO 2 and ZrSiO 4 with B 4 C without using any furnace. Magnesium was added to the mixtures of (ZrO 2 +B 4 C) and (ZrSiO 4 +B 4 C). The reaction has been assisted by a floral thermite packed around the compacts. By introducing elemental Si into (ZrO 2 +B 4 C) mixture, composite powders of ZrB 2 -SiC formed. After leaching out MgO with suitable HCl water solution, the product was analysed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effect of Si, B 4 C, and Mg on the extent of formation of ZrB 2 , ZrB 2 -SiC, and other phases has been studied. Formation of nano-sized ZrB 2 and ZrB 2 -SiC composite powders was identified. The adaptability of the process for bulk production was examined.

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Preparation and characterization of ZrB2–SiC composite powders from zircon via microwave-assisted boro/carbothermal reduction

Cited by 44 publications

References 30 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

Thermite assisted synthesis of ZrB2 and ZrB2–SiC through B4C reduction of ZrO2 and ZrSiO4 in air

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Preparation and characterization of ZrB2–SiC composite powders from zircon via microwave-assisted boro/carbothermal reduction

Cited by 44 publications

References 30 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

Thermite assisted synthesis of ZrB2 and ZrB2–SiC through B4C reduction of ZrO2 and ZrSiO4 in air

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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