By E. Dow Whitney (Editor)
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Additional resources for Ceramic Cutting Tools
Plenum Press, NY (1978). 9. S. ) Brook Hill, MA (1974). 10. C. J. T. Pascoe, “Ceramic Steel,” Nature (London), 258:703 (1975). 11. G. H. Heuer, “Transformation Toughening in Ceramics: Martensitic Transformations in Crack Tip Stress Fields,” J. Am. Cer. , a:241 (1981). 12. N. Claussen, “Fracture Toughness of Al,O, With an Unstabilized ZrO, Dispersed Phase, ” J. Am. Cer. , s:49 (1976). 13. A. H. L. R. ), John Wiley & Sons, New York, pp. 439-447 (1984). 14. A. F. I. Davis, “Uniformity of A&O,ZrO, Composites by Colloidal Filtration, ” Comm.
An example of this approach is to incorporate fine particles of partially-stabilized zirconium oxide (PSZ) into a fine grained Al,O, matrix. Zirconia undergoes a phase transformation on cooling that can be marginally prevented by adding a small amount of yttrium oxide. When such a particle is shocked it will transform instantaneously to its equilibrium state absorbing substantial energy from the surroundings. When a sharp crack initiates in an Al,O, matrix containing PSZ particles, energy is extracted from the crack as it strikes a PSZ particle and is redirected by the particle.
Laboratory tests in face milling class 30 gray cast iron have been performed at 7000 fpm with tool life values up to one hour of cutting time. Rotary tools, end mills and drills, are now manufactured by CNC grinding from solid blanks. These tools have enjoyed selective applications with great success over HSS, carbide, and coated carbide rotary tools of similar geometry. Ceramic Summary The major deficiency associated with the use of ceramic tools in production machining is low toughness. This results in chipping and breakage of the tools rather than wear.
Ceramic Cutting Tools by E. Dow Whitney (Editor)