| 摘要 |
PROBLEM TO BE SOLVED: To provide a conductive silicon nitride-based composite sintered body having a smooth surface after electrical discharge machining and good mechanical properties, and to provide a method for producing the same. SOLUTION: Silicon nitride powders, sintering aid powders, titanium metal powders and boron nitride powders are ground and mixed until the silicon nitride, titanium nitride, and titanium boride have an average particle diameter of 30 nm or less, and are sintered in a non-oxidizing atmosphere. There is obtained the silicon nitride-based composite sintered body comprising the silicon nitride having an average particle diameter of 100 nm or less, titanium nitride compounds and titanium boride having an average minor axis diameter of 20 nm or less and an aspect ratio of 3 or more, wherein fracture strength is 600 MPa or more and resistivity is 10<0> Ω.cm or less. |
