Boron Nitride based cutting tools

Divakar, C (2000) Boron Nitride based cutting tools. Metals Materials And Processes, 12 (2 & 3). pp. 197-214.

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Diamond and cubic boron nitride (CBN) are two commonly used hard materials as cutting tools. Diamond the hardest substance known can cut all but ferrous materials because of its reaction with iron. CBN next to diamond in hardness can cut all ferrous materials because of its inertness. Diamond is available in nature, whereas boron nitride is man-made. Both these materials can be produced in the laboratory by the application of high pressures and temperatures. Wurtzite boron nitride (WBN) is a hard phase of boron nitride obtained by shock loading of hexagonal boron nitride (QBN) . A composite of WBN-CBN is obtained by sintering of WBN at high pressures in the stablity region of CBN . The WBN-CBN compacts have an unique combination of high fracture toughness and hardness, which make the composite tool capable of machining under interrupted conditions . A four column 600-ton capacity press designed and fabricated for the sintering of ceramic materials at high pressures and temperatures has been used to prepare the WBN-CBN composite . The work done at the high pressure laboratory, Materials Science Division, National Aerospace Laboratories in the synthesis, sintering, fabrication and the evaluation of the WBN-CBN composite tools in the machining of various difficult-to-cut materials - hardened steels (HRC 40-63), high nickel cast iron (BHN 120-160) and Ti-6AI- 4V alloy (HV 310), and Al-SiCp MMC (silicon carbide particulate reinforced aluminum based metal-matrix-composite) are presented in this paper.

Item Type: Article
Uncontrolled Keywords: boron nitride, cutting tool, synthesis, hardened steel, titanium alloy, MMCs, performance
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms Indrani V
Date Deposited: 25 Jan 2012 04:50
Last Modified: 25 Jan 2012 04:50

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