On the borothermic preparation of titanium, zirconium and hafnium diborides

Peshev, P.; Bliznakov, G.

doi:10.1016/0022-5088(68)90199-9

Cited by 80 publications

(53 citation statements)

References 9 publications

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“…This type of synthesis is characterized by its significant negative enthalpy and high adiabatic temperature (T ad ) of greater than 1800 K [7]. ZrB 2 has also been obtained through several other reactions, including the borothermic reduction of ZrO 2 [8,9], the carbothermic reduction of ZrO 2 and B 2 O 3 [10,11], and the reduction of ZrO 2 by boron carbide [12][13][14]. However, a literature survey revealed that the metallothermic reduction of ZrO 2 and B 2 O 3 has been producing the most interest due to its inexpensive raw materials as well as the high exothermic nature of the relevant self-sustainable reactions [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

An investigation on the formation mechanism of nano ZrB2 powder by a magnesiothermic reaction

Jalaly

Bafghi

Tamizifar

et al. 2014

Journal of Alloys and Compounds

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Nanocrystalline zirconium diboride (ZrB 2 ) powder was produced by magnesiothermic reduction in the Mg/ZrO 2 /B 2 O 3 system. In this study, high-energy ball milling was used to generate the essential conditions to induce a mechanically induced self-sustaining reaction (MSR). The ignition time for ZrB 2 formation was found to be approximately 6 minutes. The mechanism for the formation of ZrB 2 in this system was determined by studying the relevant sub-reactions, the effect of stoichiometry, and the thermal behavior of the system.

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Section: Introductionmentioning

confidence: 99%

An investigation on the formation mechanism of nano ZrB2 powder by a magnesiothermic reaction

Jalaly

Bafghi

Tamizifar

et al. 2014

Journal of Alloys and Compounds

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“…Braton and Nicholls [28] used the reaction (4) and obtained ZrB 2 +BO gas at 1150 ℃. Peshev and Bliznakov [12] reported that a temperature of 1600 ℃ was needed for the completion of reaction of ZrO 2 with boron. Ran et al [29] studied the borothermal reduction of nanometric ZrO 2 powders to synthesize submicrometer-sized ZrB 2 powders in vacuum.…”

Section: Resultsmentioning

confidence: 99%

“…Variety of synthesis routes which include: (i) reduction processes [10][11][12], (ii) chemical routes [13], and (iii) reactive processes [14] can be resorted to prepare ZrB 2 powders using ZrO 2 as a source of zirconium. The reduction route is relatively much cheaper than other routes for ZrB 2 synthesis.…”

Section: Introductionmentioning

confidence: 99%

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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“…Ryu et al [19] prepared ultra-fine powders of ZrB 2 and ZrB 2 -SiC via combustion synthesis using ZrSiO 4 , Mg, C, B, and NaCl as raw materials. Impurities like Si, ZrSi, ZrC, or their combination have bee noticed.…”

Section: mentioning

confidence: 99%

“…A variety of synthesis routes [4][5][6][7][8] are practiced to prepare ZrB 2 powders: (i) reduction processes, (ii) chemical routes, and (iii) reactive processes. The reduction route using ZrO 2 as a source of zirconium is much cheaper than other processes.…”

Section: Introductionmentioning

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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On the borothermic preparation of titanium, zirconium and hafnium diborides

Cited by 80 publications

References 9 publications

An investigation on the formation mechanism of nano ZrB2 powder by a magnesiothermic reaction

An investigation on the formation mechanism of nano ZrB2 powder by a magnesiothermic reaction

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

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