A sol–gel route to nanocrystalline TiN coated cubic boron nitride particles

Umer, Malik Adeel; Park, Hee Sub; Lee, Dong Ju; Ryu, Ho Jin; Hong, Soon Hyung

doi:10.1016/j.jallcom.2011.07.070

Cited by 8 publications

(8 citation statements)

References 15 publications

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“…However, the interaction was slightly higher for the coated powder in comparison to the mixture of uncoated cBN and TiN powders. The sol gel TiN coating of cBN powders was not dense [34]. Similar results we found in own investigations concerning sol gel coatings.…”

Section: Introductionsupporting

confidence: 91%

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Thermal Stability of TiN Coated Cubic Boron Nitride Powder

et al. 2021

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Wear-resistant, super hard ceramic composites based on cubic boron nitride (cBN) are of great interest to industry. However, cBN is metastable under sintering conditions at normal pressure and converts into the soft hexagonal BN (hBN). Therefore, efforts are being made to avoid this process. Besides short sintering times, the use of coated cBN-particles is a way to minimize this process. Therefore, the thermal stability of TiN coated cBN powders in high purity argon and nitrogen atmospheres up to temperatures of 1600 °C was investigated by thermogravimetry, X-ray phase analysis, scanning electron microscopy and Raman spectroscopy. The TiN coating was prepared by the atomic layer deposition (ALD)-method. The investigations showed that the TiN layer reacts in Ar at T ≥ 1200 °C with the cBN and forms a porous TiB2 layer. No reaction takes place in nitrogen up to temperatures of 1600 °C. Nevertheless, the 20 and 50 nm thin coatings also undergo a recrystallization process during heat treatment up to temperatures of 1600 °C.

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Section: Introductionsupporting

confidence: 91%

“…Umer et al [ 33 ] sintered also with high-pressure high-temperature method cBN composites with sol gel coated TiN–cBN powders (details of the sol gel TiN coating process can be found in a previous work of Umer et al [ 34 ]) densified with TiN and Al at 1500 °C and 6 GPa. The XRD pattern showed only traces of TiB 2 .…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability of TiN Coated Cubic Boron Nitride Powder

et al. 2021

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“…The total reaction can be demonstrated as 6TiO 2 (s) + 8 NH 3 (g) → 6TiN (s) + 12H 2 O (g) + N 2 (g). The recent work reported by Hong et al . thought that the nitridization process involves a Ti 2 O 3 species.…”

Section: Resultsmentioning

confidence: 99%

“…6TiN (s) + 12H 2 O (g) + N 2 (g). The recent work reported by Hong et al 30 thought that the nitridization process involves a Ti 2 O 3 species. Therefore, the nitridization mechanism of TiO 2 in a NH 3 flow is not clear and needs further investigation.…”

Section: Wwwceramicsorg/actmentioning

confidence: 99%

Synthesis and Characterization of TiN‐coated Cubic Boron Nitride Powders

Chen

Liu

Fan

et al. 2013

Int J Applied Ceramic Tech

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Titanium nitride‐coated cubic boron nitride (TiN/cBN) composite powders were prepared by nitridizing TiO2/cBN powders in a NH3 flow at 950°C. The TiO2/cBN powders were synthesized via a sol‐gel process using tetra‐butyl titanate and concentrated‐HNO3‐treated BN powders as starting materials. The techniques of XRD, SEM, TEM, FT‐IR, and TG‐DTA were used to characterize the products and their intermediates. The cBN powders were uniformly coated with TiN nanoparticles. During the nitridization, the morphology of the TiO2/cBN powders is unchanged. The TiN/cBN powders can be used as starting materials to prepare polycrystalline cBN compacts, or as reinforcements to strengthen metal‐matrix composites.

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“…Researchers have started coating TiN, TiN-TiB 2 , nickel and SiO 2 onto a cBN powder surface. 43,46,50,58,59 Intensive further work is needed to reveal the benefi cial effects of the coatings on the sintering behavior and mechanical properties of CBCCs.…”

Section: Conclusion and Future Trendsmentioning

confidence: 99%