Sol-gel prepared Ni-alumina composite materials - Part I Microstructure and mechanical properties

E. Breval, Z. Deng, S. Chiou, Carlo G. Pantano

Research output: Contribution to journalArticlepeer-review

88 Scopus citations

Abstract

The sol-gel method has been utilized for the preparation of dense, homogeneous ceramic-metal composites with up to 50% Ni in Al2O2. Examination by SEM and TEM shows that the materials consist of micrometre-size Al2O3 with metallic Ni in isolated regions from ∼50 μm down to nanometre size. The density ranges from ∼97% (10% Ni) to ∼74% (50% Ni) of the theoretical number. The hardness decreases from ∼18 GPa for pure alumina to ∼10 GPa for alumina containing 50% Ni. The fracture toughness increases significantly from K1c=3-4 MPa m1/2 to K1c=∼8.5 MPa m1/2. The elastic and shear moduli decrease from E=∼400 GPa and G=∼160 GPa for pure alumina to E=∼320 GPa and G=∼135 GPa when containing 50% Ni. The electrical resistivity is ∼106ωm with 10 to 40% Ni but decreases drastically at 50% Ni content.

Original languageEnglish (US)
Pages (from-to)1464-1468
Number of pages5
JournalJournal of Materials Science
Volume27
Issue number6
DOIs
StatePublished - Jan 1 1992

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Sol-gel prepared Ni-alumina composite materials - Part I Microstructure and mechanical properties'. Together they form a unique fingerprint.

Cite this