Oxygen(o) Associated With More Than One Metal Patents (Class 75/234)
  • Patent number: 4022584
    Abstract: A composition of material comprising aluminum oxide and refractory transition metal diborides, with additions of magnesium oxide and, optionally, transition metal carbides, nitrides, carbonitrides and iron group metals for sintering and grain morphology control, is disclosed, which is particularly useful as a cutting tool for steels, cast iron, and hard to machine materials, such as superalloys. In contrast to the TiC-Al.sub.2 O.sub.3 cermets of the prior art which have to be hot pressed for optimum properties, a large portion of the cermets of the invention can also be fabricated, without detriment to performance, by sintering the cold pressed powder compacts in an inert furnace atmosphere at temperatures between 1650.degree. and 1820.degree. C.
    Type: Grant
    Filed: May 11, 1976
    Date of Patent: May 10, 1977
    Inventor: Erwin Rudy