KR960007502A - Manufacturing method of ferrite molded body - Google Patents

Abstract

An object of the present invention is to provide a method for producing a ferrite molded article having excellent dimensional stability with little heat shrinkage after molding, or to provide a method for easily producing a hard ferride molded article without involving the risk of dust explosion.

The manufacturing method of the ferrite molded object which concerns on this invention mixes vitrification agent powder after cooling the ferrite powder obtained by baking the ferrite raw material mixture powder at 1200-1400 degreeC below the plasticizing temperature of a vitrification agent, and frees the surface of a ferrite powder. After coating with the agent powder, it is characterized by heating at a temperature which is equal to or higher than the plasticization temperature of the vitrification agent and which is 700 ° C or lower.

Description

Manufacturing method of ferrite molded body

Since this is an open matter, no full text was included.

Claims (4)

After cooling the ferrite powder obtained by calcining the ferrite raw material mixture powder at 1200 to 1400 ° C. or lower than the plasticizing temperature of the vitrification agent, the vitrification agent powder was mixed, and the surface of the ferrite powder was coated with the vitrification agent powder. A method for producing a ferrite molded body, characterized in that it is heated at a temperature of more than the plasticization temperature and not more than 700 ° C. After cooling the soft ferrite powder obtained by calcining the ferrite raw material mixture powder at 1200 to 1400 ° C. in an oxidizing gas or inert gas atmosphere below the plasticizing temperature of the vitrification agent, the vitrification agent powder is mixed and the surface of the soft ferrite powder is vitrified. After coating with powder, it is heat-molded at the temperature which is more than the plasticization temperature of a vitrification agent and is 700 degrees C or less, The manufacturing method of the soft ferrite molded object characterized by the above-mentioned. After the hard ferrite powder obtained by calcining the ferrite raw material mixture powder at 1200 to 1400 ° C. in a reducing gas atmosphere is cooled to below the plasticizing temperature of the vitrifying agent in a reducing gas or inert gas atmosphere, the vitrification agent powder is reduced in a reducing gas or inert gas atmosphere. After mixing and coating the surface of a hard ferrite powder with a vitrification agent powder, heat-molding at the temperature more than the plasticization temperature of a vitrification agent and 700 degrees C or less, The manufacturing method of the ferrite molded object characterized by the above-mentioned. The vitrification agent is at least one member selected from the group consisting of MnO, CuO, Bi ₂ O ₃ , PbO, Tl ₂ O ₃ , Sb ₂ O ₃ and Fe ₂ O ₃ . The manufacturing method of the ferrite molded object characterized by the above-mentioned. ※ Note: The disclosure is based on the initial application.