摘要:
Provided is a process for producing a MnZn-base ferrite comprising: firing a compacted raw material to produce the MnZn-base ferrite, wherein the firing comprises, in the following order: a heating phase comprising gradually bringing a firing temperature from room temperature up to a maximum temperature; a maximum temperature holding phase comprising maintaining the maximum temperature for a period of time, wherein a partial pressure of oxygen (p2) at the maximum temperature holding phase is greater than an equilibrium partial pressure of oxygen (p1) as follows: p2>p1, wherein the equilibrium partial pressure of oxygen (p1) is represented by the following equation: log(p1)=log(PO2)=a−b/T, wherein PO2 is measured in a unit of %, and T is measured in a unit of absolute temperature K; and a cooling phase comprising gradually bringing the maximum temperature down to near room temperature, wherein a partial pressure of oxygen (p3) at the cooling phase is operated at an equilibrium partial pressure of oxygen based on the equation log(p3)=a−b/T.
摘要:
An oxide of a transition metal element having at least two valences less than 4 is contained in a spherical dielectric ceramic powder. According to a composite dielectric material using the dielectric ceramic powder, the electric resistivity can be made to take such a high value as 1.0×1012 Ω·cm or more while satisfactory dielectric properties are being maintained.
摘要:
There is provided an apparatus for producing a spherical powder, comprising a cylindrical chamber having an axis extending in the vertical direction and a burner 30 provided in the upper part of the chamber to generate a combustion flame in the chamber, characterized in that the aggregate-crushing gas G is injected from the periphery part of the first supply pipe 61, which constitutes a raw material powder supply route O, into the first supply pipe 61. This configuration can allow a raw material powder to be supplied to the combustion flame with an aggregate of the raw material powder crushed, and suppress generation of coarse particles or unmelted particles resulting from aggregation of particles. The raw material powder to be supplied to the apparatus for producing a spherical powder may have a treating agent such as stearic acid, or a coupling agent added thereto for preventing aggregation.
摘要:
The present invention provides a production method of spherical oxide powder which includes a feeding step in which a granular powder composed of an oxide composition is fed into a combustion flame together with a carrier gas; a melting step in which said fed granular powder is melted in said combustion flame to obtain a melt; and a solidifying step in which said melt is solidified by being moved and placed outside said combustion flame.
摘要:
The present invention provides a dielectric ceramic powder which can secure fluidity of the mixture with a resin, even when produced by milling. The dielectric ceramic powder, when controlled to have a specific surface area of 9 m2/cm3 or less and a lattice strain of 0.2 or less can secure fluidity of the mixture with a resin, even when it is produced by milling to have particles of indefinite shape, and give a composite dielectric material of excellent dielectric properties.
摘要翻译:本发明提供了一种电介质陶瓷粉末,其即使在通过研磨制造时也可以确保混合物与树脂的流动性。 当电介质陶瓷粉末被控制成比表面积为9m 2 / cm 3或更小,晶格应变为0.2或更小时,可确保混合物的流动性 即使通过研磨生产具有不定形状的颗粒,并且得到具有优异的介电性能的复合介电材料。