公开(公告)号：JPH1112661A

公开(公告)日：1999-01-19

申请号：JP18309597

申请日：1997-06-23

Applicant: AGENCY IND SCIENCE TECHN

Inventor： NISHIO TOSHIYUKI ,  KOBAYASHI KEIZO ,  OZAKI KOYO ,  SUGIYAMA AKIRA

IPC: C22B9/02

Abstract: PROBLEM TO BE SOLVED: To separate-refine metal base material in a short time by using a filter therefor under solid-liquid coexisting state, controlling the temp. and the pressure and removing impurities mixed at the time of recovering as solid phase or liquid phase components at half-melting temp. of the liquidus or lower. SOLUTION: A holding cylinder (c) (raw material holding vessel) and a filter (d) set at one end thereof are utilized, and a metal base material C intended to be recycled and refined is charged into the cylinder (c), and after forming the half-melting state by heating with a heater (b), pressure with a gas from a cylinder (f) for pressurizing is supplied in the cylinder (c) and only the liquid phase metal is allowed to pass through the filter (d). As metal base materials C, for refining e.g. Al-Si base, Mg-Zn base, Al-Fe base materials and the composite material of these metals and ceramics, etc., are mentioned. As composite materials, e.g. one containing ceramic grains of alumina as an impurity in the metal base material is mentioned.

公开(公告)号：JPH11323401A

公开(公告)日：1999-11-26

申请号：JP14654298

申请日：1998-05-11

Applicant: AGENCY IND SCIENCE TECHN

Inventor： KOBAYASHI KEIZO ,  SUGIYAMA AKIRA ,  NISHIO TOSHIYUKI ,  OZAKI KOYO

IPC: C01G23/00 ,  B22F1/00 ,  C22C1/05 ,  C22C29/14 ,  C22C38/00

Abstract: PROBLEM TO BE SOLVED: To densely compact a composite material at a low temp. by substituting a specified ratio of TiB2 in a composite material composed of a specified amt. of TiB2 , and the balance transition metals such as Fe, Ni, Co with Ti powder and B powder and executing mechanical alloying treatment. SOLUTION: The composite material contains >=50 wt.% TiB2 . By weight, 10 to 50% TiB2 phase to from hard phases are substituted with Ti powder and B powder. This raw material is subjected to mechanical alloying treatment. A dry type pulverizer can be utilized for this treatment, and a vibration-type ball mill or the like is preferably illustrated. The obtd. alloy powder is composed of TiB2 , Fe or the like micronized into a submicron size, Ti and B powder. Next, the powder is sintered and compacted. Moreover, the compacted body is subjected to heating treatment in a hydrostatic pressure, by which residual pores are perfectly removed to densify it. Furthermore, by executing rapid cooling after the heating, the size of crystal pasticles other than the hard phases can be micronized.

公开(公告)号：JP2000160202A

公开(公告)日：2000-06-13

申请号：JP35206698

申请日：1998-11-25

Applicant: AGENCY IND SCIENCE TECHN

Inventor： KOBAYASHI KEIZO ,  SUGIYAMA AKIRA ,  NISHIO TOSHIYUKI ,  OZAKI KOYO

IPC: B22F9/02 ,  B22F1/00 ,  C22C1/04 ,  C22C27/06 ,  C22C33/02 ,  C22C38/18

Abstract: PROBLEM TO BE SOLVED: To provide a method for producing an alloy improved in strength and excellent in recycling properties by suppressing the formation of brittle phases in an alloy composed of iron and chromium. SOLUTION: Iron and chromium powders are blended so as to control the content of chromium to 30 to 75 atomic % and are alloyed in a pressure reduced atmosphere by a mechanical alloying method to obtain a powdery mixture in a non-equilibrium state, and the powder is molded by executing electric heating at

公开(公告)号：JP2000265226A

公开(公告)日：2000-09-26

申请号：JP6957899

申请日：1999-03-16

Applicant: AGENCY IND SCIENCE TECHN

Inventor： KOBAYASHI KEIZO ,  SUGIYAMA AKIRA ,  MATSUMOTO AKIHIRO ,  NISHIO TOSHIYUKI ,  OZAKI KOYO

IPC: B22F3/02 ,  B22F1/00 ,  B22F3/10 ,  B22F9/02 ,  C22C1/04

Abstract: PROBLEM TO BE SOLVED: To provide a technique of manufacturing an alloy powder composed essentially of titanium by a mechanical alloying method in high efficiency and also to provide a solidification and forming technique causing no deterioration in the functional property of the alloy. SOLUTION: In the method for synthesizing an alloy powder containing >=50 atomic % titanium, a magnesium powder in an amount of

公开(公告)号：JPH11323402A

公开(公告)日：1999-11-26

申请号：JP14655898

申请日：1998-05-11

Applicant: AGENCY IND SCIENCE TECHN

Inventor： SUGIYAMA AKIRA ,  KOBAYASHI KEIZO ,  OZAKI KOYO ,  NISHIO TOSHIYUKI

IPC: B22F1/00 ,  B22F1/02 ,  C22C33/02 ,  C22C38/00 ,  H01L35/34

Abstract: PROBLEM TO BE SOLVED: To provide a method for finely dispersing a magnesium-silicon compound thermoelectric material, ceramics hollow particles, ceramics particles, etc., in an iron-silicon compound thermoelectric material. SOLUTION: A powdery mixture which comprises iron powder, silicon powder, cobalt powder and their inevitable metallic elements, in which atomic ratio of silicon to iron is 1:2 and 2 to 16% in atomic ratio of iron atoms are replaced with cobalt atoms and a powdery mixture in which atomic ratio of silicon to magnesium is 2:1 are simultaneously compounded at 5:1 to 1:1 by weight ratio and are subjected to a mechanical alloying treatment. Further the ceramics hollow particles are added to an obtained powder so as to be 20:1 to 1:1 by a weight ratio and then the mixture is subjected to the mechanical alloying treatment to produce a powdery mixture in which clear generation of ferrous-silicon compounds is suppressed. The obtained powder is sintered to obtain a sintered compact in which iron disilicide and magnesium silicide are alloyed at nanometer level or a sintered compact in which ceramics hollow particles are uniformly dispersed.

公开(公告)号：JP2000277815A

公开(公告)日：2000-10-06

申请号：JP8275999

申请日：1999-03-26

Applicant: AGENCY IND SCIENCE TECHN

Inventor： SUGIYAMA AKIRA ,  KOBAYASHI KEIZO ,  MATSUMOTO AKIHIRO ,  OZAKI KOYO ,  NISHIO TOSHIYUKI

IPC: H01L35/14 ,  B22F1/00 ,  C22C23/00 ,  C22C47/14 ,  H01L35/34

Abstract: PROBLEM TO BE SOLVED: To obtain a method for dispersing short thin metallic wires in a thermoelectric material composed of a magnesium-silicon compound and a thermoelectric material having superior thermoelectric characteristic. SOLUTION: A magnesium-silicon compound sintered body, in which short and thin metallic wires are uniformly scattered is obtained, in such a way that mixed powder in which the formation of a magnesium-silicon compound is clearly confirmed by X-ray diffraction is manufactured by mechanically alloying magnesium powder, silicon powder, and their inevitable metallic elements at an atomic ratio of 2:1 between magnesium atoms and silicon atoms. Then, after the short and thin metallic wires are mixed in the mixed powder at a rate of 5-30 vol.% with respect to 100 vol.% powder and the powder is dried, the powder is sintered under pressure.