| 摘要 |
PURPOSE:To manufacture a metal-ceramic joined body having superior heat resistance, wear resistance and a significant heat insulating effect by coating the surface of a metallic material with ceramics contg. Cr2O3 in the form of a slurry and by carrying out heat treatment to join firmly the ceramic layer to the metal. CONSTITUTION:The surface of an engine is roughened by sand blast, and it is coated with a slurry prepd. by adding at least one among SiO2, ZrO2, Al2O3, Fe2O3 and CaF to a concd. aqueous soln. of a soluble Cr compound such as CrO3 so that the expansion coefft. of the resulting ceramics is made close to that of the metal of the engine. The coated engine is heat treated to form a ceramic layer contg. Cr2O3 converted from CrO3. A mixed ceramic layer consisting of Cr2O3 and at least one among SiO2, ZrO2, Al2O3, Fe2O3, CaF, ZrSiO4, 2MgO.2Al2O3.5SiO2, SiC and Si3N4 is then laminated on the formed ceramic layer. Thus, the thermal efficiency of the engine is improved. |
