Densification of SiO 2-cBN composites by using Ni nanoparticle and SiO 2 nanolayer coated cBN powder

Jianfeng Zhang; Rong Tu; Takashi Goto

doi:10.1016/j.ceramint.2012.02.090

Densification of SiO ₂-cBN composites by using Ni nanoparticle and SiO ₂ nanolayer coated cBN powder

Jianfeng Zhang, Rong Tu, Takashi Goto

Materials Processing and Characterization Division

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

Cubic boron nitride (cBN) powder was coated with Ni nanoparticle and SiO ₂ nanolayer (abbreviated as cBN/Ni and cBN/SiO ₂, respectively) by rotary chemical vapor deposition (RCVD), and compacted with SiO ₂ powder by spark plasma sintering at 1473-1973 K for 0.6 ks. The effects of Ni and SiO ₂ coatings on the densification, phase transformation of cBN and hardness of SiO ₂-cBN composites were compared. The phase transformation of cBN to hBN was identified at 1973 K in SiO ₂-cBN/SiO ₂ composites, 300 K higher than that in SiO ₂-cBN/Ni composites, indicating that SiO ₂ retarded the transformation of cBN. The relative density of SiO ₂-cBN/SiO ₂ with 50 vol% cBN sintered at 1873 K was 99% with a hardness of 14.5 GPa.

Original language	English
Pages (from-to)	4961-4966
Number of pages	6
Journal	Ceramics International
Volume	38
Issue number	6
DOIs	https://doi.org/10.1016/j.ceramint.2012.02.090
Publication status	Published - 2012 Aug 1

Keywords

Cubic boron nitride (cBN)
Ni nanoparticle
Rotary CVD (RCVD)
SiO nanolayer
Spark plasma sintering

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

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title = "Densification of SiO 2-cBN composites by using Ni nanoparticle and SiO 2 nanolayer coated cBN powder",

abstract = "Cubic boron nitride (cBN) powder was coated with Ni nanoparticle and SiO 2 nanolayer (abbreviated as cBN/Ni and cBN/SiO 2, respectively) by rotary chemical vapor deposition (RCVD), and compacted with SiO 2 powder by spark plasma sintering at 1473-1973 K for 0.6 ks. The effects of Ni and SiO 2 coatings on the densification, phase transformation of cBN and hardness of SiO 2-cBN composites were compared. The phase transformation of cBN to hBN was identified at 1973 K in SiO 2-cBN/SiO 2 composites, 300 K higher than that in SiO 2-cBN/Ni composites, indicating that SiO 2 retarded the transformation of cBN. The relative density of SiO 2-cBN/SiO 2 with 50 vol% cBN sintered at 1873 K was 99% with a hardness of 14.5 GPa.",

keywords = "Cubic boron nitride (cBN), Ni nanoparticle, Rotary CVD (RCVD), SiO nanolayer, Spark plasma sintering",

author = "Jianfeng Zhang and Rong Tu and Takashi Goto",

year = "2012",

month = aug,

day = "1",

doi = "10.1016/j.ceramint.2012.02.090",

language = "English",

volume = "38",

pages = "4961--4966",

journal = "Ceramics International",

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publisher = "Elsevier Limited",

number = "6",

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TY - JOUR

T1 - Densification of SiO 2-cBN composites by using Ni nanoparticle and SiO 2 nanolayer coated cBN powder

AU - Zhang, Jianfeng

AU - Tu, Rong

AU - Goto, Takashi

PY - 2012/8/1

Y1 - 2012/8/1

N2 - Cubic boron nitride (cBN) powder was coated with Ni nanoparticle and SiO 2 nanolayer (abbreviated as cBN/Ni and cBN/SiO 2, respectively) by rotary chemical vapor deposition (RCVD), and compacted with SiO 2 powder by spark plasma sintering at 1473-1973 K for 0.6 ks. The effects of Ni and SiO 2 coatings on the densification, phase transformation of cBN and hardness of SiO 2-cBN composites were compared. The phase transformation of cBN to hBN was identified at 1973 K in SiO 2-cBN/SiO 2 composites, 300 K higher than that in SiO 2-cBN/Ni composites, indicating that SiO 2 retarded the transformation of cBN. The relative density of SiO 2-cBN/SiO 2 with 50 vol% cBN sintered at 1873 K was 99% with a hardness of 14.5 GPa.

AB - Cubic boron nitride (cBN) powder was coated with Ni nanoparticle and SiO 2 nanolayer (abbreviated as cBN/Ni and cBN/SiO 2, respectively) by rotary chemical vapor deposition (RCVD), and compacted with SiO 2 powder by spark plasma sintering at 1473-1973 K for 0.6 ks. The effects of Ni and SiO 2 coatings on the densification, phase transformation of cBN and hardness of SiO 2-cBN composites were compared. The phase transformation of cBN to hBN was identified at 1973 K in SiO 2-cBN/SiO 2 composites, 300 K higher than that in SiO 2-cBN/Ni composites, indicating that SiO 2 retarded the transformation of cBN. The relative density of SiO 2-cBN/SiO 2 with 50 vol% cBN sintered at 1873 K was 99% with a hardness of 14.5 GPa.

KW - Cubic boron nitride (cBN)

KW - Ni nanoparticle

KW - Rotary CVD (RCVD)

KW - SiO nanolayer

KW - Spark plasma sintering

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VL - 38

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EP - 4966

JO - Ceramics International

JF - Ceramics International

SN - 0272-8842

IS - 6

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