Paper Titles
Fabrication of MgSiN2 Powders via Combustion Synthesis Process
p.923
Preparation of SiBCN Microtubes from Melt-Spinnable Polymers
p.926
Layer Structure Growth of Orthorhombic Boron Nitride Thin Films by RF-PEPLD
p.929
Preparation of Microcrystalline CBN Abrasive
p.933
Property and Microstructure of Machinable B4C/BN Nanocomposites
p.936
Spark Plasma Sintered AlN-BN Composites and its Dielectric Properties
p.940
Micro Pattern Making Method on AlN-hBN Composites Using Powder Blasting Process
p.943
Machining Characteristics of AlN-hBN Composites in End-Milling and Precision Lapping Processes
p.947
Synthesis of SiCW/(Mo,W)Si2 Composite by the "Chemical Oven" Self-Propagating Combustion Method
p.951

Property and Microstructure of Machinable B4C/BN Nanocomposites

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Abstract:

The B4C/BN nanocomposites were fabricated by hot-pressing sintering of the B4C/BN nanocomposite powders at 1850oC for 1h under the pressure of 30MPa. The composite powders with the microstructure of B4C particles coated with nano-sized BN particles were prepared by the chemical reaction of H3BO3 and CO(NH2)2 on the surface of B4C particles at high temperature. The microstructure investigation of the nanocomposites sintered samples showed that the nano-sized h-BN particles were homogenously distributed in the B4C matrix. With the increasing content of h-BN, the density of the B4C/BN nanocomposites decreased gradually; the fracture strength and fracture toughness of the B4C/BN nanocomposites decreased gradually, the strength and toughness of the B4C/BN nanocomposites with the h-BN content of 10wt% and 20wt% achieved high values. The Vickers hardness of the B4C/BN nanocomposites decreased remarkably with the increasing content of h-BN, while the machinability of the B4C/BN nanocomposites was significantly improved. The B4C/BN nanocomposites with the h-BN content more than 20wt% exhibited excellent machinability.

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Periodical:

Key Engineering Materials (Volumes 368-372)

Pages:

936-939

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.368-372.936

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Online since:

February 2008

Authors:

Tao Jiang, Zhi Hao Jin, Jian Feng Yang, Guan Jun Qiao

Keywords:

Boron Carbide, Machinability, Mechanical Property, Nanosized h-BN

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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