Synthesis of ZrB2–SiC composite powder in air furnace

Krishnarao, R. V.; Alam, Md. Zafir; Das, Dipak K.; Prasad, V.V. Bhanu

doi:10.1016/j.ceramint.2014.07.085

Cited by 31 publications

(22 citation statements)

References 19 publications

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“…Recently Guo et al [30] reported the formation of fine ZrB 2 through borothermal reduction of coarse ZrO 2 (reaction (5)). Thus the addition of silicon is found to favour the reactions (2) 4 C, and Si) are in the form of loose powders or compacts [19]. At sintering temperature as low as 1500 ℃, slight shrinkage of PLRS 2.0 sample due to sintering has been observed (Fig.…”

Section: Resultsmentioning

confidence: 90%

“…To obtain a single phase ZrB 2 without impurities like un-reacted ZrO 2 , B 4 C, and free C, the excess of B 4 C in weight percentage ratio of ZrO 2 /B 4 C = 2.5 is required, where the stoichiometric weight ratio in reaction (1) is ~3.0 [19]. In this work, the ratio of ZrO 2 /B 4 C = 1.6 and 2.0 was chosen to have excess B 4 C to aid in sintering of the composite.…”

Section: Resultsmentioning

confidence: 99%

“…Since this reaction does not satisfy the Merzhanov criterion, it will not progress in self-sustaining manner. Even by rapid heating of a compact of ZrO 2 +B 4 C+Si by suddenly introducing into the furnace, formation of ZrB 2 and SiC was observed at and above a temperature of 1300 ℃ only [19].…”

Section: Resultsmentioning

confidence: 99%

“…In our previous work, B 4 C reduction of ZrO 2 to form impurity (ZrC, C)-free ZrB 2 was reported [19]. Further, composite powders of ZrB 2 -SiC with particle sizes ranging from sub-micron to nanometer have been produced by rapid heating a mixture of ZrO 2 +B 4 C+Si, in an air furnace [19] and in air without using any furnace [20].…”

Section: Introductionmentioning

confidence: 99%

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ZrB2–SiC based composites for thermal protection by reaction sintering of ZrO2+B4C+Si

Krishnarao¹,

Bhanuprasad²,

Reddy³

2017

J Adv Ceram

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Synthesis and sintering of ZrB 2 -SiC based composites have been carried out in a single-step pressureless reaction sintering (PLRS) of ZrO 2 , B 4 C, and Si. Y 2 O 3 and Al 2 O 3 were used as sintering additives. The effect of ratios of ZrO 2 /B 4 C, ZrO 2 /Si, and sintering additives (Y 2 O 3 and Al 2 O 3 ), was studied by sintering at different temperatures between 1500 and 1680 ℃ in argon atmosphere. ZrB 2 , SiC, and YAG phases were identified in the sintered compacts. Density as high as 4.2 g/cm 3 , micro hardness of 12.7 GPa, and flexural strength of 117.6 MPa were obtained for PLRS composites. Filler material was also prepared by PLRS for tungsten inert gas (TIG) welding of the ZrB 2 -SiC based composites. The shear strength of the weld was 63.5 MPa. The PLRS ZrB 2 -SiC composites exhibited: (i) resistance to oxidation and thermal shock upon exposure to plasma flame at 2700 ℃ for 600 s, (ii) thermal protection for Cf-SiC composites upon exposure to oxy-propane flame at 2300 ℃ for 600 s.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

ZrB2–SiC based composites for thermal protection by reaction sintering of ZrO2+B4C+Si

Krishnarao¹,

Bhanuprasad²,

Reddy³

2017

J Adv Ceram

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“…Synthesis temperature and morphology of ZrB 2 are shown to be altered with change in source of carbon and reaction atmosphere [12]. In our previous work, the formation of pure ZrB 2 by reducing ZrO 2 with B 4 C was reported [13].…”

Section: Introductionmentioning

confidence: 94%

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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In Situ Synthesis of ZrB2–SiC Composite Powders by Carbothermal Reduction Method

Xie

Zhang

et al. 2018

Advanced Functional Materials

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Synthesis of ZrB2–SiC composite powder in air furnace

Cited by 31 publications

References 19 publications

ZrB2–SiC based composites for thermal protection by reaction sintering of ZrO2+B4C+Si

ZrB2–SiC based composites for thermal protection by reaction sintering of ZrO2+B4C+Si

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

In Situ Synthesis of ZrB2–SiC Composite Powders by Carbothermal Reduction Method

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