Effect of metallic dopants on the microstructure and mechanical properties of TiB2

Chlup, Zdeněk; Bača, Ľuboš; Halasová, Martina; Neubauer, Erich; Hadraba, Hynek; Stelzer, Nils; Roupcová, Pavla

doi:10.1016/j.jeurceramsoc.2015.03.027

Cited by 50 publications

(18 citation statements)

References 39 publications

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“…Intergranular fracture is the main fracture mode. The grain size is estimated as 0.7 μm through the linear intercept method with a distribution of ~0.3‐3 μm, which is significantly finer than the literature results (3‐40 μm) . It has been demonstrated that the oxide impurities promote the TiB 2 grain coarsening .…”

Section: Resultsmentioning

confidence: 76%

“…The differences in phases regarding Ti 2 O 3 , Ti 3 O 5 , and TiC-xOy have been discussed in our previous research, which can be attributed to the different contact between TiO 2 and C. 25 For the formation of TiB 2 , with the appearance of TiO 2 , B 4 C, and C, two reactions may occur 17,33 : Figure 6 shows the standard Gibbs energy, DG, as a function of reaction temperature for reactions (5) and (6). Reactions (5) and (6) proceed thermodynamically at 1038°C and 1112°C, respectively.…”

Section: Reaction Processmentioning

confidence: 88%

“…There is only one broad endothermic peak at 1285°C for the precursors sample. It is also believed that only a small amount of TiB 2 forms through reaction (5), which cannot result in a split peak in the DSC curve.…”

Section: Reaction Processmentioning

confidence: 99%

“…The most significant problem with the fabrication of TiB 2 is the sintering process. Because of the super high melting point, high vapor pressure, and low diffusion rate, the sintering temperature of TiB 2 is at about 2000°C . Also, due to the high content of impurities (such as TiO 2 , B 2 O 3 , B 4 C, and free carbon) and agglomerations in the commercially available TiB 2 powders, the densification is further inhibited .…”

Section: Introductionmentioning

confidence: 99%

“…Because of the super high melting point, high vapor pressure, and low diffusion rate, the sintering temperature of TiB 2 is at about 2000°C. 5 Also, due to the high content of impurities (such as TiO 2 , B 2 O 3 , B 4 C, and free carbon) and agglomerations in the commercially available TiB 2 powders, the densification is further inhibited. 6,7 On the other hand, considering the anisotropic crystal structure of TiB 2 , cracks may form because of the exaggerated grain growth, which can adversely influence the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of TiB₂ from a carbon‐coated precursors method

Koç

2017

J Am Ceram Soc

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This article deals with the synthesis of TiB2 from carbon‐coated TiO2 precursors with the addition of B4C. The carbon‐coated precursors method alters the reaction process, compared with the conventional mixing of reactants, to produce high‐quality TiB2 powders. The produced powders have a single phase, a submicron particle size (~0.3 to 0.8 μm), regular shape, loose agglomeration, and low level of contaminations (less than 0.5 wt% carbon and 0.6 wt% oxygen). The formation mechanism proposed is based on experimental results and thermodynamic evaluations. For comparison, the powders obtained from the mixture of reactants show higher agglomeration, a large particle size (>1 μm), high level of contaminations (0.7 wt% carbon and 1.1 wt% oxygen), and difficulty to control the reaction process (formation of TiBO3 and Ti2O3 as the intermediate phases). The synthesized powders from the precursors method can be hot pressed to a relative density of ~94.5% with the formation of platelike grains at 1800°C under a pressure of 35 MPa without additives.

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Section: Resultsmentioning

confidence: 76%