Effects of cubic BN addition and phase transformation on hardness of Al2O3-cubic BN composites

Mikinori Hotta; Takashi Goto

doi:10.1016/j.ceramint.2010.09.058

Effects of cubic BN addition and phase transformation on hardness of Al₂O₃-cubic BN composites

Mikinori Hotta, Takashi Goto

Materials Processing and Characterization Division

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

17 Citations (Scopus)

Abstract

The Vickers hardness of dense Al₂O₃-cubic BN (cBN) composites prepared by spark plasma sintering under a moderate pressure of 100 MPa at 1200-1600 °C was investigated at indentation loads of 0.098-19.6 N. The BN grains in the Al₂O₃-BN composite prepared at 1300 °C showed no transformation from the cBN to hBN phase, and the hardness was 59 GPa at 0.098 N. The hardness of the Al₂O₃ matrix in the Al₂O₃-BN composites containing 10-30 vol% cBN prepared at 1300-1400 °C was around 25 GPa at 0.098 N, which was higher than monolithic Al₂O₃ bodies prepared at the same temperatures. The hardness of the Al₂O₃ matrix in the Al₂O ₃-BN composites decreased with increasing sintering temperature. The increase in the hardness of the Al₂O₃ matrix may be due to the decrease in the size of Al₂O₃ grains in the Al ₂O₃-BN composites owing to the addition of cBN particles and the decrease in sintering temperature. The Meyer exponents of the monolithic Al₂O₃ bodies and Al₂O₃-BN composites were 1.90-1.94 independent of cBN content.

Original language	English
Pages (from-to)	1453-1457
Number of pages	5
Journal	Ceramics International
Volume	37
Issue number	5
DOIs	https://doi.org/10.1016/j.ceramint.2010.09.058
Publication status	Published - 2011 Jul

Keywords

A. Sintering
B. Composites
C. Hardness
D. Nitrides

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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10.1016/j.ceramint.2010.09.058

Cite this

@article{aeb20af158af4f9485444434a4509956,

title = "Effects of cubic BN addition and phase transformation on hardness of Al2O3-cubic BN composites",

abstract = "The Vickers hardness of dense Al2O3-cubic BN (cBN) composites prepared by spark plasma sintering under a moderate pressure of 100 MPa at 1200-1600 °C was investigated at indentation loads of 0.098-19.6 N. The BN grains in the Al2O3-BN composite prepared at 1300 °C showed no transformation from the cBN to hBN phase, and the hardness was 59 GPa at 0.098 N. The hardness of the Al2O3 matrix in the Al2O3-BN composites containing 10-30 vol% cBN prepared at 1300-1400 °C was around 25 GPa at 0.098 N, which was higher than monolithic Al2O3 bodies prepared at the same temperatures. The hardness of the Al2O3 matrix in the Al2O 3-BN composites decreased with increasing sintering temperature. The increase in the hardness of the Al2O3 matrix may be due to the decrease in the size of Al2O3 grains in the Al 2O3-BN composites owing to the addition of cBN particles and the decrease in sintering temperature. The Meyer exponents of the monolithic Al2O3 bodies and Al2O3-BN composites were 1.90-1.94 independent of cBN content.",

keywords = "A. Sintering, B. Composites, C. Hardness, D. Nitrides",

author = "Mikinori Hotta and Takashi Goto",

note = "Funding Information: This work was supported by a Grant-in-Aid for Young Scientists (Start-up) (No. 18860009 ), the Asian CORE Program and the Global COE Program “Materials Integration, Tohoku University,” MEXT, Japan and the Rare Metal Substitution Materials Development Project of the New Energy and Industrial Technology Development Organization. We also appreciate the financial support of Mitsubishi Materials Corporation .",

year = "2011",

month = jul,

doi = "10.1016/j.ceramint.2010.09.058",

language = "English",

volume = "37",

pages = "1453--1457",

journal = "Ceramics International",

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T1 - Effects of cubic BN addition and phase transformation on hardness of Al2O3-cubic BN composites

AU - Hotta, Mikinori

AU - Goto, Takashi

N1 - Funding Information: This work was supported by a Grant-in-Aid for Young Scientists (Start-up) (No. 18860009 ), the Asian CORE Program and the Global COE Program “Materials Integration, Tohoku University,” MEXT, Japan and the Rare Metal Substitution Materials Development Project of the New Energy and Industrial Technology Development Organization. We also appreciate the financial support of Mitsubishi Materials Corporation .

PY - 2011/7

Y1 - 2011/7

N2 - The Vickers hardness of dense Al2O3-cubic BN (cBN) composites prepared by spark plasma sintering under a moderate pressure of 100 MPa at 1200-1600 °C was investigated at indentation loads of 0.098-19.6 N. The BN grains in the Al2O3-BN composite prepared at 1300 °C showed no transformation from the cBN to hBN phase, and the hardness was 59 GPa at 0.098 N. The hardness of the Al2O3 matrix in the Al2O3-BN composites containing 10-30 vol% cBN prepared at 1300-1400 °C was around 25 GPa at 0.098 N, which was higher than monolithic Al2O3 bodies prepared at the same temperatures. The hardness of the Al2O3 matrix in the Al2O 3-BN composites decreased with increasing sintering temperature. The increase in the hardness of the Al2O3 matrix may be due to the decrease in the size of Al2O3 grains in the Al 2O3-BN composites owing to the addition of cBN particles and the decrease in sintering temperature. The Meyer exponents of the monolithic Al2O3 bodies and Al2O3-BN composites were 1.90-1.94 independent of cBN content.

AB - The Vickers hardness of dense Al2O3-cubic BN (cBN) composites prepared by spark plasma sintering under a moderate pressure of 100 MPa at 1200-1600 °C was investigated at indentation loads of 0.098-19.6 N. The BN grains in the Al2O3-BN composite prepared at 1300 °C showed no transformation from the cBN to hBN phase, and the hardness was 59 GPa at 0.098 N. The hardness of the Al2O3 matrix in the Al2O3-BN composites containing 10-30 vol% cBN prepared at 1300-1400 °C was around 25 GPa at 0.098 N, which was higher than monolithic Al2O3 bodies prepared at the same temperatures. The hardness of the Al2O3 matrix in the Al2O 3-BN composites decreased with increasing sintering temperature. The increase in the hardness of the Al2O3 matrix may be due to the decrease in the size of Al2O3 grains in the Al 2O3-BN composites owing to the addition of cBN particles and the decrease in sintering temperature. The Meyer exponents of the monolithic Al2O3 bodies and Al2O3-BN composites were 1.90-1.94 independent of cBN content.

KW - A. Sintering

KW - B. Composites

KW - C. Hardness

KW - D. Nitrides

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JO - Ceramics International

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