Investigation of MAX phase/c-BN composites

Rampai, Tokoloho; Lang, Candace; Sigalas, Iakovos

doi:10.1016/j.ceramint.2012.10.279

Cited by 19 publications

(15 citation statements)

References 10 publications

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“…Process of *eatening-out* of cBN grains gets more prominent with cBN content grow. In the samples sintered from mixtures with 74% and 87m% cBN content at 2400 °C local cBN recrystallization is observed 7 (Fig. 7).…”

Section: Microstructurementioning

confidence: 94%

“…At T=1600-1800 °C crystallization process begins from the region boundaries. 7 at the same time very particular cBN grains kept their borders developed Crystallized phases have dendritic nanoscale structure. Starting from 1800 °C spheroidal formations with size 5-20 nm appeared to be found.…”

Section: Microstructurementioning

confidence: 99%

“…But here are some difficulties when hitting this way. One of them is that superhard phases starting to be unstable under conditions required for efficient MAX-phase sintering [5] [2] [7].…”

Section: Introductionmentioning

confidence: 99%

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Superhard pcBN tool materials with Ti3SiC2 MAX-phase binder: Structure, properties, application

Kolabylina

Bushlya

Petrusha

et al. 2017

J. Superhard Mater.

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Superhard fine-grain ceramic cutters were sintered in cBN-(Ti3SiC2-TiC) system by high pressure high temperature (HPHT) method. Short-time (60 sec) sintering was performed under the pressure 8 GPa in temperature range of 1400-2400 °C. As initial mixtures three compositions were chosen with 87, 74 and 49m% of cBN. Initial mixtures were prepared by thorough mixing of cBN (1/3µm) and Ti3SiC2-TiC (0/2µm). Final-samples composition in all cases got different from initial mixtures composition. The reason why is Ti3SiC2 decomposition and further reaction occurs in newly made system. Microstructure observations, phase composition estimation as well as tests of mechanical properties of ceramic cutting tools were carried out. Obtained data appeared to be sustainably affected both by varying Ti3SiC2-TiC content and sintering conditions. Was estimated the way they both affect kinetic of reactions, recrystallization, ratio between cross-reaction products and how it does reflect on their mechanical properties at the end.

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Section: Microstructurementioning

confidence: 94%

Section: Microstructurementioning

confidence: 99%

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Superhard pcBN tool materials with Ti3SiC2 MAX-phase binder: Structure, properties, application

Kolabylina

Bushlya

Petrusha

et al. 2017

J. Superhard Mater.

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“…However, theoretical studies that focus on the early stage of the oxidation mechanisms of MAX phases had rarely been reported despite the growing interests in applying MAX phases as corrosion resistant coatings [21][22][23][24]. In addition, there has been a limited understanding of the surface properties and the oxygen adsorption onto the surface during corrosion [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Ab initio study on the adsorption mechanism of oxygen on Cr2AlC (0 0 0 1) surface

Sakidja

Ching

2014

Applied Surface Science

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We performed an investigation of the early stage oxidation of the technologically relevant Cr2AlC (0001) surface by ab initio calculations. In this work, the geometrical structure, bonding character, and electronic structure of the Cr2AlC (0001) bare surface with or without single oxygen atom and molecular adsorption had been systematically investigated by DFT calculation. Four possible terminations Al-, Cr(C)-, C-and Cr(Al)-terminated Cr2AlC (0001) surface are considered. The corresponding surface energies of the four configurations are compared, indicating that the Al-and Cr(C)-terminated surfaces are more stable than the other two cases C-and Cr(Al)-terminated surfaces. For the most stable case, Al-terminated Cr2AlC (0001) surface, a detailed model describing the oxygen-surface interactions is developed by assessing the adsorption energetics of various adsorption mechanisms. Based on the evaluation of the energetics and the structural properties of the atomistic models generated, the results point to a consistent picture of the initial stage of the Cr2AlC (0001) surface oxidation resembling that of (111) layer of pure Al FCC phase .

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“…The major phases listed from most to least in the sample were: TiN, TiB 2 , TiC and AlN. 10 Therefore, there was an expected advantage to investigating composites of the Ti 2 AlC MAX phase and cubic boron nitride (cBN). cBN has excellent physical properties, in particular a high hardness 50 GPa, second only to diamond, at 90 GPa.…”

mentioning

confidence: 99%

Utilization of moderate pressure and elevated temperatures in the optimization of Ti₂AlC‐cBN composites using SPS technique

Rampai

Sigalas

Whitefield

2021

Int J Ceramic Engine & Sci

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MAX phases are ternary compounds with both metallic and ceramic properties. 1 Ceramic material consisting of MAX phases are relatively ductile and machinable, yet also heat-tolerant, strong and lightweight. 1,2 Among the MAX phases reported so far, aluminum containing Ti 2 AlC and Ti 3 AlC 2 , are two of the most lightweight and oxidation resistant. 2-6 These two compositions show promise for many applications especially in the field of high temperature heat resisting materials. 4 Composites of Ti 2 AlC with other ceramics, such as Ti-Al, TiC and Al 2 O 3 , have been investigated using temperature

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Investigation of MAX phase/c-BN composites

Cited by 19 publications

References 10 publications

Superhard pcBN tool materials with Ti3SiC2 MAX-phase binder: Structure, properties, application

Superhard pcBN tool materials with Ti3SiC2 MAX-phase binder: Structure, properties, application

Ab initio study on the adsorption mechanism of oxygen on Cr2AlC (0 0 0 1) surface

Utilization of moderate pressure and elevated temperatures in the optimization of Ti₂AlC‐cBN composites using SPS technique

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Investigation of MAX phase/c-BN composites

Cited by 19 publications

References 10 publications

Superhard pcBN tool materials with Ti3SiC2 MAX-phase binder: Structure, properties, application

Superhard pcBN tool materials with Ti3SiC2 MAX-phase binder: Structure, properties, application

Ab initio study on the adsorption mechanism of oxygen on Cr2AlC (0 0 0 1) surface

Utilization of moderate pressure and elevated temperatures in the optimization of Ti2AlC‐cBN composites using SPS technique

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Product

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Utilization of moderate pressure and elevated temperatures in the optimization of Ti₂AlC‐cBN composites using SPS technique