A comparison study on microstructure and mechanical properties of Si 3N4 ceramic prepared from MACS powders

K. G. Ren; K. X. Chen; H. B. Jin; X. S. Ning; H. P. Zhou

doi:10.4028/0-87849-410-3.1179

A comparison study on microstructure and mechanical properties of Si ₃N₄ ceramic prepared from MACS powders

K. G. Ren, K. X. Chen^*, H. B. Jin, X. S. Ning, H. P. Zhou

^*Corresponding author for this work

Tsinghua University

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

Abstract

In present work, ultra-fine powders with alpha phase content higher than 95 wt% and specific surface area of 15.33 m²/g were prepared by mechanical activated combustion synthesis (MACS) process. The sinterability of as-fabricated Si₃N₄ as well as the microstructure and mechanical properties of the sintered bulk were investigated by comparing with a kind of commercial available Si₃N₄ powders used as diluents in MACS process. Employing hot-pressing method, both powders were sintered equally by using Y₂O₃ and Al₂O ₃ as sintering aids. Results showed that smaller particle size and higher specific surface area were obtained by MACS process when compared with the commercial one. Bulk Si₃N₄ appeared approximately the same relative density, hardness, strength and fracture toughness, however, proved to be higher while using MACS powders.

Original language	English
Pages (from-to)	1179-1181
Number of pages	3
Journal	Key Engineering Materials
Volume	336-338 II
DOIs	https://doi.org/10.4028/0-87849-410-3.1179
Publication status	Published - 2007
Externally published	Yes

Keywords

Combustion synthesis
Silicon nitride
Sinterablity properties

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.4028/0-87849-410-3.1179

Cite this

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title = "A comparison study on microstructure and mechanical properties of Si 3N4 ceramic prepared from MACS powders",

abstract = "In present work, ultra-fine powders with alpha phase content higher than 95 wt% and specific surface area of 15.33 m2/g were prepared by mechanical activated combustion synthesis (MACS) process. The sinterability of as-fabricated Si3N4 as well as the microstructure and mechanical properties of the sintered bulk were investigated by comparing with a kind of commercial available Si3N4 powders used as diluents in MACS process. Employing hot-pressing method, both powders were sintered equally by using Y2O3 and Al2O 3 as sintering aids. Results showed that smaller particle size and higher specific surface area were obtained by MACS process when compared with the commercial one. Bulk Si3N4 appeared approximately the same relative density, hardness, strength and fracture toughness, however, proved to be higher while using MACS powders.",

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author = "Ren, {K. G.} and Chen, {K. X.} and Jin, {H. B.} and Ning, {X. S.} and Zhou, {H. P.}",

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AU - Ren, K. G.

AU - Chen, K. X.

AU - Jin, H. B.

AU - Ning, X. S.

AU - Zhou, H. P.

PY - 2007

Y1 - 2007

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AB - In present work, ultra-fine powders with alpha phase content higher than 95 wt% and specific surface area of 15.33 m2/g were prepared by mechanical activated combustion synthesis (MACS) process. The sinterability of as-fabricated Si3N4 as well as the microstructure and mechanical properties of the sintered bulk were investigated by comparing with a kind of commercial available Si3N4 powders used as diluents in MACS process. Employing hot-pressing method, both powders were sintered equally by using Y2O3 and Al2O 3 as sintering aids. Results showed that smaller particle size and higher specific surface area were obtained by MACS process when compared with the commercial one. Bulk Si3N4 appeared approximately the same relative density, hardness, strength and fracture toughness, however, proved to be higher while using MACS powders.

KW - Combustion synthesis

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KW - Sinterablity properties

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