| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composite material excellent in wear resistance against molten metal abrasion and corrosion resistance, having a long life, enabling safe metal melting operation by adding an aggregate to a matrix having specified volume contents of AlN and TiB2 . SOLUTION: This composite material has volume contents in a matrix of >=10% and <=90% of AlN and the rest of TiB2 . An oxide such as alumina, ZrO2 , TiO2 , MgO, SiO2 , or Cr2 O3 , a carbide such as SiC, TiC, ZrC, CrC2 or B4 C, a nitride such as AlN, TiN, ZrN, Si3 N4 , CrN or BN or a boride such as ZrB2 , TiB2 or Cr2 B3 , these compound and mixture are used as the aggregate. The composite material is obtained by weighing 50vol.% of an alumina aggregate having 1-3mm particle diameter and the rest of a matrix of AlN having 1μm average particle diameter and TiB2 having 3μm average particle diameter in the above-mentioned ration and blending the weighed materials, molding the mixture into a crucible-shaped green compact material under 1 ton/cm<2> by a hydraulic press and sintering the molded green compact composition at 1,700 deg.C. |
