Formation of TaB2 powders from high energy ball milling and borothermal reduction process

Gürcan, Kübra; Ayas, Erhan

doi:10.1016/j.matchemphys.2019.121732

Cited by 10 publications

(6 citation statements)

References 27 publications

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“…White-colored grains were also observed which are correspond to TaC grains. Observation of TaC grains was related to the C diffusion from the graphite crucible during the heat treatment process which was explained in our previous study [32]. It was clearly observed that the distribution of SiC particles and GNP's were not well-distributed in the microstructure which shown with yellow rectangular in Figure 2.a.…”

Section: Accepted Manuscriptmentioning

confidence: 50%

“…Remarkable point in this figure, intensity of TaC peak was increased with the addition of GNPs. As mentioned before, TaC formation was explained with the C diffusion from graphite crucible during the synthesis and sintering of TaB2 [32]. In addition, interaction between GNPs and TaB2 was thought to be another reason for the formation of TaC.…”

Section: Accepted Manuscriptmentioning

confidence: 83%

“…The composition was prepared by using as-synthesized TaB2 [32] and 20 vol %SiC (HC-Starck Grade UF-15) and graphene nanoplatelets (GNPs) (Graphene Chemical Industries Company, 99.9% purity, 120-150 m 2 /g specific surface area, 5-8 nm thickness, 5 µm average particle diameter). TaB2-SiC composites were mixed in a polythene bottle for 24h with using Si3N4 balls as milling medium.…”

Section: Powder Preparation and Sintering Parametersmentioning

confidence: 99%

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Microstructures and mechanical properties of graphene platelets-reinforced spark plasma sintered tantalum diboride-silicon carbide composites

Gürcan¹,

İnci²,

Sackan³

et al. 2019

Mater. Res. Express

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Graphene nanoplates reinforcement (GNPs) TaB2-SiC composites were fabricated with Spark Plazma sintering (SPS) at 1850°C with a-uniaxial pressure of 50 MPa and 10 min dwell time. Systematic investigation on the effect of GNP amount ofdensification, microstructural and mechanical properties (microhardness and fracture toughness) of the composites were presented. Density and hardness of composites decreased with the addition of GNP, while ~35% increase of fracture toughness value was obtained with GNP addition. The microstructural evaluation indicated that overlapped and agglomerated GNPs increased with an increasing amount of GNP in the composites and caused to decrease of density and hardness. On the other hand, GNP was retained in the composite form even with high process temperature (1850°C) and cause toughening of composites with changing the fracture mode from transgranular to transgranular/intergranular fracture. GNP pull out, crack branching, crack bridging and crack deflection were observed as main toughening mechanisms.

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Section: Accepted Manuscriptmentioning

confidence: 50%

Section: Accepted Manuscriptmentioning

confidence: 83%

Section: Powder Preparation and Sintering Parametersmentioning

confidence: 99%

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Microstructures and mechanical properties of graphene platelets-reinforced spark plasma sintered tantalum diboride-silicon carbide composites

Gürcan¹,

İnci²,

Sackan³

et al. 2019

Mater. Res. Express

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“…Carbides and diborides of transition metals with melting temperature higher than 3000 o C, such as HfC, ZrC, TaC, HfB 2 , ZrB 2 and TaB 2 , are known as ultra-high temperature ceramic materials (UHTCs). They are fueling the development of aerospace materials, refractory materials and protection materials, etc., owing to their excellent thermochemical properties, outstanding oxidation resistance, high physical stability and mechanical properties in ultra-high temperature environments [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

In-situ synthesis of ultra-fine ZrB2–ZrC–SiC nanopowders by sol-gel method

Liu

Chang

et al. 2020

Ceramics International

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ZrB 2 -ZrC-SiC nanopowders with uniform phase distribution were prepared from cost-effective ZrOCl 2 •8H 2 O by a simple sol-gel method. The synthesis route, ceramization mechanism and morphology evolution of the nanopowders were investigated. ZrB 2 -ZrC-SiC ceramic precursor can be successfully obtained through hydrolysis and condensation reactions between the raw materials. Pyrolysis of the precursor was completed at 650 o C, and it produced ZrO 2 , SiO 2 , B 2 O 3 and amorphous carbon with a yield of 39% at 1300 o C. By heat-treated at 1500 o C for 2 h, highly crystallized ZrB 2 -ZrC-SiC ceramics with narrow size distribution were obtained. With the holding time of 2 h, both the crystal size and the particle size can be refined.Further prolonging the holding time can lead to serious particles coarsening. Studies

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“…Milling process of a solid state powder, where the powder particles are subjected to high energetic impacts by the balls in a vial, which involves repeated cold welding, fracturing, and rewelding of powder particles, is called mechanical alloying [3]. Numerous studies have been devoted to production of transition metal borides using a mechanical alloying [4][5][6][7][8][9][10][11]. This method allows one to obtain a nanocrystalline structure of these compounds, which helps to reduce the sintering temperature of borides to achieve a dense state of material.…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of Refractory Borides Formation during Mechanical Alloying IV-V Group Transition Metals with Boron in Planetary Mill

Savyak¹,

Melnick²

2020

Recent Advances in Boron-Containing Materials

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Mechanical alloying in the transition IV-V group metal-boron systems runs by the two following mechanisms: mechanically induced reaction of self-propagating synthesis determined by the enthalpy of refractory compound formation and capability to form substitutional solid solution through replacement of a metal atom by boron atoms; and diffusion-controlled process when a supersaturated interstitial solid solution prevails and its bcc lattice gradually transforms to the hexagonal lattice of the MeB 2 phase at a critical boron content. The domination of one of the above mechanisms is determined by capability of boron to form substitutional or interstitial solid solution. In the case of formation of combined (SSS and ISS) solid solutions, domination of a mechanism is determined by the interatomic bond strength as well as by the intensity of mechanical alloying. The method for calculation of the free Gibbs energy of the interstitial and substitutional solid solutions on the basis of the regular solution model was developed. It was shown that during milling tantalum and boron in a planetary mill, at first the formation of a combined solid solution occurs where two boron atoms replace one tantalum atom. Both the mechanisms of solid solution formation decrease the solution Gibbs energy. When a SSS dominates over the formation of an ISS, the Gibbs energy acquires a minimum value at a concentration of boron in tantalum of 50 at%, which leads to the solution decomposition.

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Formation of TaB2 powders from high energy ball milling and borothermal reduction process

Cited by 10 publications

References 27 publications

Microstructures and mechanical properties of graphene platelets-reinforced spark plasma sintered tantalum diboride-silicon carbide composites

Microstructures and mechanical properties of graphene platelets-reinforced spark plasma sintered tantalum diboride-silicon carbide composites

In-situ synthesis of ultra-fine ZrB2–ZrC–SiC nanopowders by sol-gel method

Peculiarities of Refractory Borides Formation during Mechanical Alloying IV-V Group Transition Metals with Boron in Planetary Mill

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