Compositions: ceramic – Ceramic compositions – Refractory
Patent
1997-05-21
1999-11-30
Marcantoni, Paul
Compositions: ceramic
Ceramic compositions
Refractory
501153, C04B 3510
Patent
active
059942517
ABSTRACT:
A sintered alumina-based ceramic has a relative density of equal to or higher than 95%, an average grain size in a range of 10-25 .mu.m and a fracture toughness Kc equal to or lower than 3.0 MPam.sup.1/2 Furthermore. In a machinability evaluation test using a surface grinder, the ceramic exhibits equal to or less than 310 W of increase in the load on a motor rotating a grinding wheel of the surface grinder. The machinability evaluation test is performed under the following condition.
(1) The dimension of a test piece of the sintered alumina-based ceramic is larger than 15 mm in width, larger than 30 mm in length and larger than 10 mm in height.
(2) The test piece is fixed on a table of said surface grinder and ground by the grinding wheel along a direction of its length.
(3) The grinding wheel has a dimension of 10 mm in width and 200 mm in outer diameter, and consists of synthetic (or artificial) diamond abrasive grains more than 80 wt % of which are in a grain size range of 74-88 .mu.m, and which are resin-bonded at 3.3 cts/cm.sup.3 of weight content per unit volume.
(4) The circumferrential speed of said grinding wheel is 2400 m/min, the table traversing speed is 60 mm/min, and the infeed per traverse is 3 mm.
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Marcantoni Paul
NGK Spark Plug Co. Ltd.
Snider Ronald R.
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