Use Of Salt Bath Patents (Class 75/358)
  • Patent number: 5882376
    Abstract: A mechanochemical process for producing fine WC/Co composite powder which is so small in WC grain size and in mean free path, and contains such a uniform distribution of WC and Co that its hard metal is superior in strength, compressive strength, TRS and wear resistance and considerably free of impurities. The method comprises the steps of drying an ammonium metatungstate--Co(NO.sub.3).sub.2 solution in a spray dry manner to give initial powder of porous spheroids or in a common manner to give a cake of initial powder, removing the salts and humidity from the initial powder by a thermal treatment, mixing and milling the desalted initial powder with carbon black, and subjecting the mixed powder to reduction/carburization in a reactor.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: March 16, 1999
    Assignee: Korea Institute of Machinery & Materials
    Inventors: Byoung-Kee Kim, Gil-Geun Lee, Gook-Hyun Ha, Dong-Won Lee
  • Patent number: 5402305
    Abstract: An oxidation-resistant palladium powder containing one or more alkaline earth metal elements in a total amount of at least 0.005% by weight relative to Pd. The palladium powder is useful as a conductive component of a thick-film conductive paste and the resultant conductive paste can provide internal electrodes to a multilayered ceramic capacitor with minimized structural defects such as cracks or delamination. The palladium powder is produced by spraying a palladium salt solution containing one or more alkaline earth metal elements to form droplets and heating the droplets to a temperature of at least 1000.degree. C. The preferred amount of the alkaline earth metal elements in the Pd powder is from 0.005 to 0.1% by weight relative to Pd and the preferred alkaline earth metal elements are one or more elements selected from the group consisting of Mg, Ca, Sr and Ba.
    Type: Grant
    Filed: November 29, 1993
    Date of Patent: March 28, 1995
    Assignee: Shoei Chemical Inc.
    Inventors: Eiichi Asada, Yuji Akimoto, Shinichi Ono, Kazurou Nagashima, Mineto Iwasaki, Masayuki Maekawa
  • Patent number: 5176810
    Abstract: The invention relates to a method for producing metal powders from reactive metals, when the employed raw materials are metal ions in a liquid phase. According to the invention, the metal ions are first reduced into metal in a molten salt electrolysis. The obtained reduction products are further subjected to a high-temperature treatment, for example by means of plasma, in order to improve the powder qualities of the metal. The metal to be treated is for instance titanium or zirconium.
    Type: Grant
    Filed: June 4, 1991
    Date of Patent: January 5, 1993
    Assignee: Outokumpu Oy
    Inventors: Heikki J. Volotinen, Jyri J. Talja, Pekka A. Taskinen