Magnesium composite powder, method for producing same, magnesium base composite material and method for producing same

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 . Magnesium composite powder which is a starting raw material to manufacture a particle-dispersion type of magnesium group composite material by a solid-phase reaction synthesis, comprising: 
 magnesium alloy coarse particles serving as a main component which constitutes a matrix of a magnesium alloy; and    fine-grained powder comprising a component which reacts with magnesium to form a compound, and attached on a surface of said magnesium alloy coarse particle.    
   
   
       2 . The magnesium composite powder according to  claim 1 , wherein said fine-grained powder comprises at least one kind of powder particles selected from a group consisting of silicon (Si), silica (SiO 2 ), γalumina (Al 2 O 3 ) and aluminum (Al).  
   
   
       3 . The magnesium composite powder according to  claim 1 , wherein a particle diameter of said magnesium alloy coarse particle is 100 μm to 5 mm and a particle diameter of said fine-grained powder is not more than 100 μm.  
   
   
       4 . The magnesium composite powder according to  claim 3 , wherein a particle diameter of said magnesium alloy coarse particle is 500 μm to 2 mm and a particle diameter of said fine-grained powder is 0.5 μm to 50 μm.  
   
   
       5 . The magnesium composite powder according to  claim 1 , wherein said fine-grained powder is attached on the surface of said magnesium alloy coarse particle through a binder.  
   
   
       6 . The magnesium composite powder according to  claim 1 , wherein said fine-grained powder is attached on the surface of said magnesium alloy coarse particle through oil.  
   
   
       7 . The magnesium composite powder according to  claim 1 , wherein said fine-grained powder and said magnesium alloy coarse particle are mechanically bonded.  
   
   
       8 . A magnesium group composite material manufactured using the magnesium composite powder according to  claim 1 , wherein 
 reaction products of said magnesium alloy coarse particle and said fine-grained powder are dispersed in a magnesium alloy matrix, and    said reaction product 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 .    
   
   
       9 . The magnesium group composite material according to  claim 8 , comprising graphite powder as a solid lubricant agent, wherein 0.5% to 3% by weight of the graphite powder is contained in the magnesium group composite material.  
   
   
       10 . The magnesium group composite material according to  claim 8 , wherein 20% or less by weight of said reaction products is contained in said magnesium alloy matrix.  
   
   
       11 . The magnesium group composite material according to  claim 10 , wherein 5% to 10% by weight of said reaction products is contained.  
   
   
       12 . A manufacturing method of magnesium composite powder comprising: 
 a step of preparing magnesium alloy coarse particles;    a step of mixing fine-grained powder comprising a component which reacts with magnesium to form a compound, in a binder solution; and    a step of spraying said binder solution containing said fine-grained powder onto said magnesium alloy coarse particles and drying it.    
   
   
       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.