Composite material and a method for producing the same
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.
Claims14
A method for producing a composite material with a resistivity of at least 10 ohm-cm, comprising the steps of:
- providing grains made of a first substance, said first substance comprising at least one of a metal and an alloy thereof;
- forming a thin coating film on the surface of said grains to prepare coated grains, said thin coating film being made of a second dielectric substance and having a mean thickness smaller than the mean particle size of said grains, said second dielectric substance comprising an inorganic material;
- compacting said coated grains into a green body;
- and
- densifying said green body in an active gas atmosphere, while forming an additional thin coating film on the surface of said grains, said additional thin coating film being made of the second dielectric substance or a third dielectric substance and having a mean thickness smaller than the mean particle size of said grains.
A method for producing a composite material with a resistivity of at least 10 ohm-cm, comprising the steps of:
- providing grains of a first substance, said first substance comprising at least one of a metal and an alloy thereof;
- forming a thin coating film on the surface of said grains to prepare coated grains, said thin coating film being made of a second dielectric substance and having a mean thickness smaller than the mean particle size of said grains, said second dielectric substance comprising an inorganic material;
- compacting said coated grains into a green body;
- and
- densifying said green body in an active gas atmosphere, while forming an additional thin coating film on the surface of said grains, said additional thin coating film being made of the second dielectric substance or a third dielectric substance and having a mean thickness smaller than the mean particle size of said grains;
- wherein said second dielectric substance is aluminium nitride.
Dependencies are inferred from the claim text.