Effects of additives of CaO and rare-earth oxides on the sintering behavior of AIN ceramics

Chih Hung Chu, Yun-Hwei Shen, Chih Peng Lin, Shaw Bing Wen

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The effect of additives of CaO plus three different rare-earth oxides (Y, Sm and Gd, separately) on the sintering behavior of AlN ceramics has been evaluated at 1700 °C by using a MoSi2 heater and ambient atmosphere. The results of density measurements show that the atomic weight of the rare-earth element may substantially affect the apparent density of the sintered AlN specimen due to the kinetics of atomic diffusion during sintering. The optimum results of this study show that these additives are effective in obtaining an apparent density of 3.26 g/cm3 (approaching a 100 % theoretical density of AlN). The Vicker's hardness of the sintered AlN can reach a high value of 1310 kg/mm2 and an apparent density of 3.34 g/cm3. A longer soaking time of between 3 and 5 h is necessary to practically eliminate the minor oxide phases.

Original languageEnglish
Pages (from-to)1545-1549
Number of pages5
JournalJournal of the Korean Physical Society
Volume52
Issue number5
DOIs
Publication statusPublished - 2008 Jan 1

Fingerprint

sintering
rare earth elements
ceramics
oxides
Vickers hardness
atomic weights
soaking
heaters
atmospheres
kinetics

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

@article{ddd8baaec75a47ad80ed9e8c8a0996e1,
title = "Effects of additives of CaO and rare-earth oxides on the sintering behavior of AIN ceramics",
abstract = "The effect of additives of CaO plus three different rare-earth oxides (Y, Sm and Gd, separately) on the sintering behavior of AlN ceramics has been evaluated at 1700 °C by using a MoSi2 heater and ambient atmosphere. The results of density measurements show that the atomic weight of the rare-earth element may substantially affect the apparent density of the sintered AlN specimen due to the kinetics of atomic diffusion during sintering. The optimum results of this study show that these additives are effective in obtaining an apparent density of 3.26 g/cm3 (approaching a 100 {\%} theoretical density of AlN). The Vicker's hardness of the sintered AlN can reach a high value of 1310 kg/mm2 and an apparent density of 3.34 g/cm3. A longer soaking time of between 3 and 5 h is necessary to practically eliminate the minor oxide phases.",
author = "Chu, {Chih Hung} and Yun-Hwei Shen and Lin, {Chih Peng} and Wen, {Shaw Bing}",
year = "2008",
month = "1",
day = "1",
doi = "10.3938/jkps.52.1545",
language = "English",
volume = "52",
pages = "1545--1549",
journal = "Journal of the Korean Physical Society",
issn = "0374-4884",
publisher = "Korean Physical Society",
number = "5",

}

Effects of additives of CaO and rare-earth oxides on the sintering behavior of AIN ceramics. / Chu, Chih Hung; Shen, Yun-Hwei; Lin, Chih Peng; Wen, Shaw Bing.

In: Journal of the Korean Physical Society, Vol. 52, No. 5, 01.01.2008, p. 1545-1549.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of additives of CaO and rare-earth oxides on the sintering behavior of AIN ceramics

AU - Chu, Chih Hung

AU - Shen, Yun-Hwei

AU - Lin, Chih Peng

AU - Wen, Shaw Bing

PY - 2008/1/1

Y1 - 2008/1/1

N2 - The effect of additives of CaO plus three different rare-earth oxides (Y, Sm and Gd, separately) on the sintering behavior of AlN ceramics has been evaluated at 1700 °C by using a MoSi2 heater and ambient atmosphere. The results of density measurements show that the atomic weight of the rare-earth element may substantially affect the apparent density of the sintered AlN specimen due to the kinetics of atomic diffusion during sintering. The optimum results of this study show that these additives are effective in obtaining an apparent density of 3.26 g/cm3 (approaching a 100 % theoretical density of AlN). The Vicker's hardness of the sintered AlN can reach a high value of 1310 kg/mm2 and an apparent density of 3.34 g/cm3. A longer soaking time of between 3 and 5 h is necessary to practically eliminate the minor oxide phases.

AB - The effect of additives of CaO plus three different rare-earth oxides (Y, Sm and Gd, separately) on the sintering behavior of AlN ceramics has been evaluated at 1700 °C by using a MoSi2 heater and ambient atmosphere. The results of density measurements show that the atomic weight of the rare-earth element may substantially affect the apparent density of the sintered AlN specimen due to the kinetics of atomic diffusion during sintering. The optimum results of this study show that these additives are effective in obtaining an apparent density of 3.26 g/cm3 (approaching a 100 % theoretical density of AlN). The Vicker's hardness of the sintered AlN can reach a high value of 1310 kg/mm2 and an apparent density of 3.34 g/cm3. A longer soaking time of between 3 and 5 h is necessary to practically eliminate the minor oxide phases.

UR - http://www.scopus.com/inward/record.url?scp=44649117350&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=44649117350&partnerID=8YFLogxK

U2 - 10.3938/jkps.52.1545

DO - 10.3938/jkps.52.1545

M3 - Article

AN - SCOPUS:44649117350

VL - 52

SP - 1545

EP - 1549

JO - Journal of the Korean Physical Society

JF - Journal of the Korean Physical Society

SN - 0374-4884

IS - 5

ER -