Influence of compaction pressure on density, bending strength, and microstructures of Al2O3-SiC-ZrO2 ceramic matrix composites with Nb2O5 additives

Dewi Lestari Natalia, Risly Wijanarko, Irene Angela, Bondan Tiara Sofyan

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Ceramic matrix composites (CMCs) are known to have high hardness, temperature and corrosion resistance, while being comparatively lightweight. One of many external factors that influence the mechanical properties of CMC is the compaction pressure given during fabrication process. Generally, greater amount of applied compaction pressure will result in improved final product density and bending strength. In this research, a type of CMCs was fabricated using Al2O3, SiC, and ZrO2 powder mixed with Nb2O5 additive of 81Al2O3-10SiC-5ZrO2-4Nb2O5 wt. % composition. Fabrication was done through mixing, compacting, and sintering process. Compaction was performed at 257, 308, and 359 MPa and finished with sintering process at 1400 °C for 4 h Final samples were characterized by density measurement, 3-point bending strength testing, XRD for phase investigation, and microstructure observation using SEM-EDS. Results showing that samples with 308 MPa compaction pressure possessed the highest density and bending strength of 3.29 gr/cm3 and 14.91 MPa, respectively. These numbers however, declined on samples with higher compaction pressure of 359 MPa due to the formation of porosities caused by entrapped gas that failed to exit the sample of which compaction pressure was considered to be overwhelmingly high.

Original languageEnglish
Title of host publicationFrontiers of Composite Materials II
EditorsDarren Martin
PublisherTrans Tech Publications Ltd
Pages61-65
Number of pages5
ISBN (Print)9783035712070
DOIs
Publication statusPublished - 1 Jan 2018
Event2nd International Conference on Frontiers of Composite Materials, ICFCM 2017 - [state] VIC, Australia
Duration: 15 Nov 201717 Nov 2017

Publication series

NameMaterials Science Forum
Volume923 MSF
ISSN (Print)0255-5476

Conference

Conference2nd International Conference on Frontiers of Composite Materials, ICFCM 2017
CountryAustralia
City[state] VIC
Period15/11/1717/11/17

Keywords

  • Bending strength
  • Ceramic matrix composite
  • Compaction
  • Density
  • Porosity
  • Pressure

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