Applying Nickel Nanolayer Coating onto BB4BC Particles for Processing Improvement

Zhu, Xiaojing; Lu, Kathy; Dong, Honggang; Glomb, Chris; Logan, E.A.; Nagarathnam, Karthik

doi:10.1002/9780470456248.ch11

Cited by 1 publication

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“…Based on the similarity among WC, VC, and B 4 C, it is conjectured that electroless coating of Ni–B nanolayer onto B 4 C particles might have the potential to facilitate the diffusion of the boron and carbon species during sintering. Under such motivation, we have carried out extensive work to understand the electroless coating process of Ni–B nanolayer onto B 4 C particle surfaces and the reduction of the corresponding Ni 2 O 3 and B 2 O 3 oxides in the nanolayer 19–23 …”

Section: Introductionmentioning

confidence: 99%

“…Under such motivation, we have carried out extensive work to understand the electroless coating process of Ni-B nanolayer onto B 4 C particle surfaces and the reduction of the corresponding Ni 2 O 3 and B 2 O 3 oxides in the nanolayer. [19][20][21][22][23] In this work, sintering of pure B 4 C samples and Ni 2 B nanolayer-coated B 4 C samples was carried out. The samples were obtained by uniaxial die compaction and combustion driven compaction (CDC) processes.…”

Section: Introductionmentioning

confidence: 99%

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Nickel–Boron Nanolayer‐Coated Boron Carbide Pressureless Sintering

Zhu

Nagarathnam

2009

Journal of the American Ceramic Society

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Sintering of pure B4C and Ni2B nanolayer‐coated B4C was studied from 1300° to 1600°C, with the holding time at the peak temperatures being 2 or 10 h. Compacts were made by uniaxial die compaction and combustion‐driven compaction. Pure B4C sample shows less sintering at all conditions. Ni2B‐coated B4C sample shows more extensive densification, neck formation, and grain shape accommodation. The combustion driven compaction process accelerates sintering by offering higher green density to start with. The Ni2B species on the B4C particle surfaces melts into a nickel–boron‐containing liquid phase during heating, remains as liquid during sintering, and then transforms into Ni4B3 and NiB during cooling. High‐resolution composition analysis shows that there is no nickel diffusion into bulk B4C during the sintering process. However, there is boron diffusion into the Ni2B coating layer. Carbon diffusion cannot be directly measured but is believed to be a simultaneous process as boron diffusion. A multievent sintering process has been proposed to explain the observations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%