PREPARATION METHOD OF CERAMIC COMPOSITE MATERIAL FORMING DIAMOND THIN FILM LAYER, AND CERAMIC DIAMOND COMPOSITE MATERIAL THEREBY

摘要

PURPOSE: A method for preparing a ceramic composite material forming a diamond thin film layer and a ceramic diamond composite material prepared by the method are provided, to form a diamond thin film layer on the surface of a ceramic material with improved in adhesion strength by changing the microstructure of a ceramic material. CONSTITUTION: The method comprises the steps of mixing 70-80 wt.% of a Si3N4-based ceramic material and 20-30 wt.% of Y2O3-Al2O3(6) for 3-10 hours to obtain rather non-uniform mixture; drying the mixture composition by using a common microwave drier, sintering the mixture at a temperature of 1,800 deg.C and at atmospheric pressure under nitrogen atmosphere with a pressure of 3-5 MPa for 2 hours, and sintering it at a temperature of 1,800-2,050 deg.C with a gas pressure of 3-5 MPa for 2 hours, to promote the growth of particle by the phase transfer of Si3N4 and to obtain a rod-shaped -Si3N4 particle; leaving the rod-shaped -Si3N4 particle at a room temperature to solidify liquid Y2O3-Al2O3, corroding the solidified Y2O3-Al2O3 to allow the rod-shaped -Si3N4 particle to be projected in the length of 3 mm or more, and evaporation-depositing a diamond thin film layer(4) on the surface, thereby allowing the grown rod-shaped -Si3N4 particle to be bonded with the surface.