Fabrication of composites with excellent mechanical properties based on cubic boron nitride reinforced with carbon nanotubes. Issue 11 (1st August 2019)

• Record Type: Journal Article
• Authors: Sun, Kun; Zhu, Yumei; Li, Zhihong; Li, Liqiang; Ji, Huanli; Lv, Xiaoxin
• Is Part Of: Ceramics international. Volume 45:Issue 11(2019)
• Page Start: 14287
• Page End: 14290
• Publication Date: 2019-08-01
• Subjects: Composites -- Carbon nanotubes -- Toughness -- Fracture -- Wear resistance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.04.138
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Composites consisting of cubic boron nitride (cBN) as a matrix and carbon nanotubes (CNTs) as reinforcing additives were fabricated by high-temperature and high-pressure sintering (HTHP). Microstructures, mechanical properties, fracture modes and toughening mechanisms of these composites were investigated. Composites exhibited excellent bending strength, wear resistance, and fracture toughness. Fracture toughness of composites reached 7.02 MPa·m 1/2 . Comparing to pure cBN matrix, bending strength improved from 475.27 to 600.15 MPa, and wear resistance increased by 43.23%. Such improvements of mechanical properties were mainly attributed to pullout and bridging reinforcements by CNTs. CNTs incorporation also changed fracture mode from inter-to trans-granular. Graphical abstract: Image 1