专利汇可以提供Magnetic metallic powder and its production专利检索,专利查询,专利分析的服务。并且PURPOSE: To obtain magnetic powder having excellent dispersibility and oxidation stability by forming a copper film on the particle surface of magnetic metallic powder then dispersing the powder into an aq. soln. of a silicon compd. to neutralize the same and forming further a silicon oxide film on the copper film.
CONSTITUTION: An alkaline suspension contg. the magnetic metallic powder such as Fe
3 O
4 powder or iron-nickel alloy powder and copper salt (e.g.; copper sulfate) is prepd. and a reducing agent (e.g., sodium borohydride) is added thereto to reduce the copper salt and to form the copper film on the particle surfaces of the magnetic metallic powder. The magnetic powder is then dispersed into the aq. soln. of the silicon compd. (e.g.; sodium silicate) and carbon dioxide is blown thereto or an acid is added thereto to neutralize the same then the dispersion is subjected to rinsing, filtering and drying to form further the silicon oxide film on the particle surface of the magnetic powder on which the copper film is formed. The intended magnetic metallic powder suitable for production of a magnetic recording medium is thus obtd.
COPYRIGHT: (C)1986,JPO&Japio,下面是Magnetic metallic powder and its production专利的具体信息内容。
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