Manufacturing method of a magnesium group composite material

Abstract

Magnesium composite powder which is a starting raw material to manufacture a particle-dispersion type of magnesium group composite material comprises magnesium alloy coarse particles ( 7 ) serving as a main component which constitutes a matrix of a magnesium alloy and fine-grained powder ( 8 ) comprising a component which reacts with magnesium to form a compound and attached on a surface of the magnesium alloy coarse particle ( 7 ) through a binder ( 9 ).

1 - 12 . (canceled) 
     
     
         13 . A manufacturing method of a magnesium group composite material comprising:
 a step of attaching fine-grained powder comprising a compound which reacts with magnesium to form a compound, on a surface of a magnesium alloy coarse particle;   a step of pressing and solidifying magnesium composite powder in which the fine-grained powder is attached on the surface of said magnesium alloy coarse particle;   a step of heating a solidified body provided by said pressing and solidifying step in an inert gas atmosphere or a non-oxidizing gas atmosphere, and generating compound particles by solid-phase reaction synthesis of said magnesium alloy coarse particle and said fine-grained powder; and   a step of densifying the solidified body by performing a warm plasticity process on the solidified body which generated said compound particles.   
     
     
         14 . The manufacturing method of the magnesium group composite material according to  claim 13 , wherein said warm plasticity process is an extrusion method in which an extrusion ratio is not less than 20. 
     
     
         15 . The manufacturing method of the magnesium group composite material according to  claim 14 , wherein an extrusion ratio of said extrusion method is not less than 35. 
     
     
         16 . The manufacturing method of the magnesium group composite material according to  claim 13 , wherein said compound particle comprises at least one kind of compound selected from a group consisting of Mg 2 Si, MgO, Al 3 Mg 2 , Mg 17 Al 12  and MgAl 2 O 4 . 
     
     
         17 . The manufacturing method of the magnesium group composite material according to  claim 13 , wherein said fine-grained powder is attached on the surface of said magnesium alloy coarse particle using a binder. 
     
     
         18 . The manufacturing method of the magnesium group composite material according to  claim 13 , wherein said step of attaching said fine-grained powder comprises a step of mixing said fine-grained powder in a binder solution, and
 a step of spraying said binder solution containing said fine-grained powder on said magnesium alloy coarse particle and drying it.   
     
     
         19 . The manufacturing method of the magnesium group composite material according to  claim 13 , wherein said fine-grained powder is attached on the surface of said magnesium alloy coarse particle using oil. 
     
     
         20 . The manufacturing method of the magnesium group composite material according to  claim 19 , comprising:
 a step of charging said magnesium alloy coarse particle powder in a container;   a step of putting oil in said container and uniformly attaching oil on the surface of said magnesium alloy coarse particle powder by rotating, shaking and oscillating the container; and   a step of putting said fine-grained powder in said container and attaching said fine-grained powder on the surface of said magnesium alloy coarse particle powder through the oil by rotating, shaking and oscillating said container again.   
     
     
         21 . The manufacturing method of the magnesium group composite material according to  claim 20 , wherein 0.2 to 1% by weight of said oil is added in said magnesium alloy coarse particle powder. 
     
     
         22 . The manufacturing method of the magnesium group composite material according to  claim 19 , comprising:
 a step of charging said magnesium alloy coarse particle powder in a container;   a step of putting oil and balls in said container and uniformly attaching oil on the surface of said magnesium alloy coarse particle powder by rotating, shaking and oscillating the container; and   a step of putting said fine-grained powder in said container and attaching said fine-grained powder on the surface of said magnesium alloy coarse particle powder through the oil by rotating, shaking and oscillating said container again.   
     
     
         23 . The manufacturing method of the magnesium group composite material according to  claim 19 , wherein an evaporation temperature of said oil in an inert gas atmosphere or a non-oxidizing atmosphere is not more than 400° C. 
     
     
         24 . The manufacturing method of the magnesium group composite material according to  claim 13 , wherein said fine-grained powder is mechanically bonded to the surface of said magnesium alloy coarse particle.