Magnesium Based Composite Powder, Magnesium Based Alloy Base Material and Manufacturing Method Thereof

Abstract

Magnesium based composite powder that is a starting raw material to manufacture a Mg 2 Si dispersion type of magnesium based composite material comprises Mg based powder ( 7 ) that is a main component constituting the matrix of a magnesium alloy, and Mg 2 Si powder attached to the surface of the Mg based powder ( 7 ) through a binder ( 9 ).

1 . A magnesium based composite powder comprising magnesium based powder, and magnesium silicide (Mg 2 Si) that is dispersed on the surface and/or inside of the matrix of said magnesium based powder.  
   
   
       2 . The magnesium based composite powder according to  claim 1 , wherein the maximum particle diameter of said Mg 2 Si is not more than 50 μm.  
   
   
       3 . The magnesium based composite powder according to  claim 1 , wherein the maximum particle diameter of said Mg 2 Si is not more than 20 μm.  
   
   
       4 . The magnesium based composite powder according to  claim 1 , wherein the maximum particle diameter of said Mg 2 Si is not more than 5 μm.  
   
   
       5 . The magnesium based composite powder according to  claim 1 , wherein the magnesium based composite powder contains 5 to 60% by volume of said Mg 2 Si.  
   
   
       6 . A magnesium based alloy base material provided by compacting and sintering the magnesium based composite powder according to  claim 1 , wherein Mg 2 Si particles are dispersed in the matrix.  
   
   
       7 . A manufacturing method of magnesium based composite powder comprising: 
 a step of preparing magnesium (Mg) based powder and magnesium silicide (Mg 2 Si) powder;    a step of applying a binder to the surface of said Mg based powder; and    a step of bonding the Mg 2 Si powder to the surface of the Mg based powder by mixing and stirring the Mg based powder to which said binder has been applied and said Mg 2 Si powder.    
   
   
       8 . A manufacturing method of magnesium based composite powder comprising: 
 a step of preparing magnesium (Mg) based powder and magnesium silicide (Mg 2 Si) powder; and    a step of blending said Mg based powder and said Mg 2 Si powder and mechanically mixing them to bond the Mg 2 Si powder to the surface of the Mg based powder mechanically.    
   
   
       9 . A manufacturing method of magnesium based composite powder comprising: 
 a step of preparing magnesium (Mg) based powder and magnesium silicide (Mg 2 Si) powder;    a step of mixing said Mg based powder and said Mg 2 Si powder;    a step of manufacturing a Mg based powder compact in which said Mg 2 Si particles are dispersed by compacting said mixed powder in a mold;    a step of manufacturing a Mg based sintered alloy in which said Mg 2 Si particles are dispersed by sintering said Mg based powder compact; and    a step of powdering said Mg based sintered alloy by mechanical grinding or cutting.    
   
   
       10 . A manufacturing method of magnesium based composite powder comprising: 
 a step of preparing magnesium (Mg) based powder and silicon (Si) powder;    a step of mixing said Mg based powder and said Si powder;    a step of manufacturing a Mg based powder compact in which said Si particles are dispersed by compacting said mixed powder in a mold;    a step of synthesizing Mg 2 Si by heating said Mg based powder compact to react Mg with Si, and at the same time manufacturing a Mg based sintered alloy in which said Mg 2 Si particles are dispersed; and    a step of powdering said Mg based sintered alloy by mechanical grinding or cutting.    
   
   
       11 . A manufacturing method of magnesium based composite powder comprising: 
 a step of inputting magnesium silicide (Mg 2 Si) powder to molten magnesium based alloy and stirring it;    a step of manufacturing a casting base material by casting said molten material in a mold; and    a step of powdering said casting base material by mechanical grinding or cutting.    
   
   
       12 . A manufacturing method of magnesium based composite powder comprising: 
 a step of preparing magnesium (Mg) based powder and magnesium silicide (Mg 2 Si) powder;    a step of mixing said Mg based powder and said Mg 2 Si powder;    a step of manufacturing a Mg based powder compact in which said Mg 2 Si particles are dispersed by compacting said mixed powder in a mold;    a step of manufacturing a Mg 2 Si particle dispersed Mg based casting base material by dissolving and casting said Mg based powder compact; and    a step of powdering said casting base material by mechanical grinding or cutting.    
   
   
       13 . A manufacturing method of magnesium based composite powder comprising: 
 a step of preparing magnesium (Mg) based powder and silicon (Si) powder;    a step of mixing said Mg based powder and said Si powder;    a step of manufacturing a Mg based powder compact in which said Si particles are dispersed by compacting said mixed powder in a mold;    a step of synthesizing Mg 2 Si by heating said Mg based powder compact to react Mg with Si, and at the same time manufacturing a Mg based sintered alloy in which said Mg 2 Si particles are dispersed;    a step of manufacturing a Mg 2 Si particle dispersed Mg based casting base material by dissolving and casting said Mg based sintered alloy; and    a step of powdering said casting base material by mechanical grinding or cutting.    
   
   
       14 . A manufacturing method of a magnesium based alloy base material comprising: 
 a step of compacting the magnesium based composite powder according to  claim 1;     a step of heating said powder compact to 200 to 400° C. in an inert gas atmosphere or a non-oxygenated gas atmosphere; and    a step of extruding said powder compact to a dense state immediately after said heating.