ChemInform Abstract: Nb— and Cr—Al2O3 Composites with Interpenetrating Networks.

✍ Scribed by D. E. GARCIA; S. SCHICKER; R. JANSSEN; N. CLAUSSEN

• Publisher: John Wiley and Sons
• Year: 2010
• Weight: 31 KB
• Volume: 29
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.199834296

✦ Synopsis

Nb-and Cr-Al 2 O 3 Composites with Interpenetrating Networks. -Cr-Al 2 O 3 and Nb-Al 2 O 3 composites containing 50 vol% metal are fabricated by pressureless sintering of compacts of attrition milled powder mixtures. Strength and fracture toughness of the composites increase with increasing milling time. For a composite containing 50 vol% Nb, strengths of up to 690 MPa with a corresponding fracture toughness of 6.6 MPa m 1/2 and a hardness of 11.2 GPa (H v20 ) are obtained, whereas strengths of 592 MPa, fracture toughness of 6.6 MPa m 1/2 , and hardness of 9.3 GPa are obtained for Cr-Al 2 O 3 composites. -(GARCIA, D.