| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ceramic roll which is excellent in thermal impact resistance, strength and insulation property and used for a hot rolling line. <P>SOLUTION: This roll is a ceramic roll which is used for the hot rolling line, composed of a sintered compact consisting essentially of a silicon nitride and a coefficient R which is expressed by R=σc (1-ν)/Eα (where, σc is the rupture strength, ν is Poisson's ratio, E is Young's modulus and α is the thermal expansion coefficient.) is ≥600. The sintered compact consists essentially of the silicon nitride the heat conductivity of which is ≥60 W/(m×K), the four-point bending strength of which is ≥700 MPa and the withstand voltage of which is ≥16 kV/mm. <P>COPYRIGHT: (C)2004,JPO |
