carboloy (kärˈbəloi) [key] [portmanteau word from carbon and alloy], an alloy containing cobalt, tungsten, and carbon. This alloy is extremely hard, harder than steel; it is used to cut steel, porcelain, quartz, and other materials. Its hardness is little affected by heat, and it retains a sharp cutting edge even at red heat.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.