Composite material comprising metallic alloy grains coated with a dielectric substance
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKoichi Kugimiya, Yasuhiro Sugaya, Osamu Inoue, Mitsuo Satomi, Ken Hirota
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Abstract
A composite material is provided which includes a discrete phase including grains made of a first substance; and a continuous phase including a thin coating film made of a second substance and formed on the surface of each of the grains. The thin coating film has a mean thickness smaller than the mean particle size of the grains. The grains are separated substantially from each other by the thin coating film. The porosity of the composite material is 5% or less.
Claims8
A composite sintered material with a resistivity of at least 10 ohm-cm comprising:
- a discrete phase including grains made of a first substance, said first substance comprising at least one of a metal and an alloy thereof;
- and
- a continuous phase including a thin coating film made of a second substance of a dielectric material comprising an inorganic material and formed on the surface of said grains to prepare coated grains, said thin coating film having a mean thickness smaller than the mean particle size of said grains,
- wherein said grains are separated substantially from each other by said thin coating film and the porosity of said composite sintered material is 5% or less, said coated grains being compacted into a green body and said green body being densified in an active gas atmosphere of oxygen, nitrogen or air, and said mean thickness of the thin coating film being from 5 to 50 nanometers, and
- wherein said first substance contains an aluminum metal and said second substance of a dielectric material contains oxides or nitrides of aluminum.
A composite sintered material with a resistivity of at least 10 ohm-cm comprising:
- a discrete phase including grains made of a first substance, said first substance comprising at least one of a metal and an alloy thereof;
- and
- a continuous phase including a thin coating film made of a second substance of a dielectric material comprising an inorganic material and formed on the surface of said grains to prepare coated grains, said thin coating film having a mean thickness smaller than the mean particle size of said grains,
- wherein said grains are separated substantially from each other by said thin coating film and the porosity of said composite sintered material is 5% or less, said coated grains being compacted into a green body and said green body being densified in an active gas atmosphere of oxygen, nitrogen or air, and said mean thickness of the thin coating film being from 5 to 50 nanometers, and
- wherein said first substance is an iron-based magnetic metal and said second substance of a dielectric material is selected from manganese-zinc ferrite or nickel-zinc ferrite.
A composite sintered material with a resistivity of at least 10 ohm-cm comprising:
- a discrete phase including grains made of a first substance, said first substance comprising at least one of metal and an alloy thereof;
- and
- a continuous phase including a thin coating film made of a second substance of a dielectric material comprising an inorganic material and formed on the surface of said grains to prepare coated grains, said thin coating film having a mean thickness smaller than the mean particle size of said grains,
- wherein said grains are separated substantially from each other by said thin coating film and the porosity of said composite sintered material is 5% or less, said coated grains being compacted into a green body and said green body being densified in an active gas atmosphere of oxygen, nitrogen or air, and said mean thickness of the thin coating film being from 5 to 50 nanometers, and
- wherein said first substance is an iron-based magnetic metal containing aluminum and said second substance of a dielectric material is at least one selected from the group consisting of aluminum oxide, aluminum nitride, and aluminum oxide nitride.
Dependencies are inferred from the claim text.