Magnesium base composite material

Abstract

The present invention provides a magnesium-base composite material capable of suppressing coarse growth of a crystal particle size of a magnesium matrix and Mg 2 Si particles, thereby providing excellent mechanical properties such as strength and hardness, and a manufacturing method thereof. The manufacturing method includes the steps of: blending matrix powder containing Mg and Si powder to obtain a blended matter; applying a plasticization treatment to the resulting blended matter to form a solid body; heating the solid body to allow Mg and Si to react with each other to form a heat solid body containing Mg 2 Si; and applying a warm plasticization treatment to the heat solid body. Thus, it is possible to provide a magnesium-base composite material having a tensile strength from not less than 100 MPa to not more than 500 MPa.

1 - 53 . canceled  
     
     
         54 . A magnesium-base composite material comprising a matrix containing magnesium (Mg), and magnesium silicide (Mg 2 Si) formed by a solid-phase reaction to be dispersed in the matrix, wherein 
 with respect to 100 parts by weight of the magnesium-base composite material, an amount of silicon (Si) is not less than 2 parts by weight to not more than 8 parts by weight, and an amount of magnesium silicide (Mg 2 Si) is not less than 3 parts by weight to not more than 22 parts by weight.    
     
     
         55 . The magnesium-base composite material according to  claim 54 , wherein a tensile strength of the magnesium-base composite material is not less than 100 MPa to not more than 500 MPa.  
     
     
         56 . The magnesium-base composite material according to  claim 54 , wherein a tensile strength of the magnesium-base composite material is not less than 350 MPa to not more than 500 MPa.  
     
     
         57 . The magnesium-base composite material according to  claim 54 , a grain size of said magnesium silicide (Mg 2 Si) is not less than 10 nm to not more than 30 μm.  
     
     
         58 . The magnesium-base composite material according to  claim 54 , a grain size of said magnesium silicide (Mg 2 Si) is not less than 10 nm to not more than 10 μm.  
     
     
         59 . The magnesium-base composite material according to  claim 54 , further comprising magnesium oxide (MgO) and/or silica (SiO 2 ).  
     
     
         60 . The magnesium-base composite material according to  claim 54 , wherein a Micro Vickers hardness (Hv) of the magnesium-base composite material is 80 to 125.  
     
     
         61 . The magnesium-base composite material according to  claim 54 , wherein a Rockwell hardness (E scale: HRE) of the magnesium-base composite material is 40 to 120.  
     
     
         62 . The magnesium-base composite material according to  claim 54 , wherein a rigidity of the magnesium-base composite material is 47 to 65 GPa.  
     
     
         63 . The magnesium-base composite material according to  claim 54 , wherein the magnesium-base composite material is used for a product selected from the group consisting of a raw material, a part for transport equipment, a part for electric appliance, a housing product, a part for precision machine, a sports product, a weapon, a medical instrument and a welfare caring instrument.  
     
     
         64 . A magnesium-base composite material comprising a matrix containing magnesium (Mg), and magnesium silicide (Mg 2 Si) formed by a solid-phase reaction to be dispersed in the matrix, wherein 
 a tensile strength of the magnesium-base composite material is not less than 100 MPa to not more than 350 MPa.    
     
     
         65 . The magnesium-base composite material according to  claim 64 , wherein a Rockwell hardness (E scale: HRE) of the magnesium-base composite material is 40 to 105.  
     
     
         66 . A magnesium-base composite material comprising a matrix containing magnesium (Mg), and magnesium silicide (Mg 2 Si) formed by a solid-phase reaction to be dispersed in the matrix, wherein 
 a Rockwell hardness (E scale: HRE) of the magnesium-base composite material is not less than 40 to not more than 105.    
     
     
         67 . A magnesium-base composite material comprising a matrix containing magnesium (Mg), and magnesium silicide (Mg 2 Si) formed by a solid-phase reaction to be dispersed in the matrix, wherein 
 a Rockwell hardness (E scale: HRE) of the magnesium-base composite material is greater than that of a matrix material of the magnesium-base composite material except said magnesium silicide by a value of not less than 20 to not more than 80.    
     
     
         68 . The magnesium-base composite material according to  claim 67 , wherein a tensile strength of the magnesium-base composite material is greater than that of a matrix material of the magnesium-base composite material except said magnesium silicide by a value of not less than 20 MPa to not more than 100 MPa.  
     
     
         69 . A magnesium-base composite material comprising a matrix containing magnesium (Mg), and magnesium silicide (Mg 2 Si) formed by a solid-phase reaction to be dispersed in the matrix, wherein 
 a tensile strength of the magnesium-base composite material is greater than that of a matrix material of the magnesium-base composite material except said magnesium silicide by a value of not less than 20 MPa to not more than 100 MPa.    
     
     
         70 . A method of manufacturing a magnesium-base composite material including a matrix containing magnesium (Mg), and magnesium suicide (Mg 2 Si) formed by a solid-phase reaction to be dispersed in the matrix, comprising the steps of: 
 (a) blending a first material containing magnesium (Mg) and a second material containing silicon (Si) at a predetermined ratio to prepare a blended powder;    (b) performing a plastic working on said blended powder to form a solid body;    (c) heating said solid body to form a magnesium silicide (Mg 2 Si) by a solid-phase reaction of magnesium (Mg) and silicon (Si) and disperse the magnesium silicide in the matrix; and    (d) performing a warm plastic working on said solid body with said magnesium silicide dispersed in the matrix.    
     
     
         71 . The method of manufacturing the magnesium-base composite material according to  claim 70 , wherein said blended powder is a mixture of said first material and said second material, and 
 said step (b) of performing the plastic working on said blended powder includes compressing said mixture filled in a container to obtain a compressed powder molded body having a void content of not more than 35%.    
     
     
         72 . The method of manufacturing the magnesium-base composite material according to  claim 70 , wherein said blended powder is an aggregation of composite powder having silicon (Si) dispersed in the matrix powder containing magnesium (Mg), and 
 said step (b) of performing the plastic working on said blended powder includes compressing said aggregation filled in a container to obtain a compressed powder molded body.    
     
     
         73 . The method of manufacturing the magnesium-base composite material according to  claim 70 , wherein said step (b) of performing the plastic working on said blended powder includes: 
 performing a compressing deformation process, a extruding deformation process and/or a backward extruding deformation process on said blended powder filled in a metal mold or a container;    mixing and/or grinding said blended powder after said deformation working; and    applying a pressure to said blended powder to form a solid body.    
     
     
         74 . The method of manufacturing the magnesium-base composite material according to  claim 70 , wherein said step (b) of performing the plastic working on said blended powder includes decreasing a particle size of said second material to be not less than 10 nm to not more than 30 μm.  
     
     
         75 . The method of manufacturing the magnesium-base composite material according to  claim 70 , further comprising the step of re-heating the solid body obtained after said warm plastic working.  
     
     
         76 . The method of manufacturing the magnesium-base composite material according to  claim 70 , wherein said warm plastic working is a warm extruding or a warm forging.  
     
     
         77 . The method of manufacturing the magnesium-base composite material according to  claim 70 , wherein a heating temperature in said step (c) of heating said solid body is not less than 150° C. to less than 650° C.  
     
     
         78 . The method of manufacturing the magnesium-base composite material according to  claim 70 , wherein a heating temperature in said step (c) of heating said solid body is not less than 150° C. to not more than 600° C.  
     
     
         79 . The method of manufacturing the magnesium-base composite material according to  claim 70 , wherein a heating temperature in said step (c) of heating said solid body is not less than 150° C. to not more than 520° C.  
     
     
         80 . The method of manufacturing the magnesium-base composite material according to  claim 70 , wherein a heating temperature in said step (c) of heating said solid body is not less than 350° C. to less than 650° C.  
     
     
         81 . The method of manufacturing the magnesium-base composite material according to  claim 70 , wherein a heating temperature in said step (c) of heating said solid body is not less than 350° C. to not more than 600° C.  
     
     
         82 . The method of manufacturing the magnesium-base composite material according to  claim 70 , wherein a heating temperature in said step (c) of heating said solid body is not less than 350° C. to not more than 520° C.  
     
     
         83 . The method of manufacturing the magnesium-base composite material according to  claim 70 , wherein a heating temperature in said step (c) of heating said solid body is not less than 150° C. to less than 350° C.  
     
     
         84 . The method of manufacturing the magnesium-base composite material according to  claim 75 , wherein a heating temperature in said step of re-heating said solid body is not less than 150° C. to less than 650° C.  
     
     
         85 . The method of manufacturing the magnesium-base composite material according to  claim 75 , wherein a heating temperature in said step of re-heating said solid body is not less than 150° C. to not more than 600° C.  
     
     
         86 . The method of manufacturing the magnesium-base composite material according to  claim 75 , wherein a heating temperature in said step of re-heating said solid body is not less than 150° C. to not more than 520° C.  
     
     
         87 . The method of manufacturing the magnesium-base composite material according to  claim 75 , wherein a heating temperature in said step of re-heating said solid body is not less than 350° C. to less than 650° C.  
     
     
         88 . The method of manufacturing the magnesium-base composite material according to  claim 75 , wherein a heating temperature in said step of re-heating said solid body is not less than 350° C. to not more than 600° C.  
     
     
         89 . The method of manufacturing the magnesium-base composite material according to  claim 75 , wherein a heating temperature in said step of re-heating said solid body is not less than 350° C. to not more than 520° C.  
     
     
         90 . The method of manufacturing the magnesium-base composite material according to  claim 75 , wherein a heating temperature in said step of re-heating said solid body is not less than 150° C. to less than 350° C.  
     
     
         91 . The method of manufacturing the magnesium-base composite material according to  claim 70 , wherein said step (b) of performing the plastic working on said blended powder includes: 
 applying a compressing pressure to deform said blended powder consisting of said first material and said second material in a metal mold; and    extruding and deforming said blended powder along an inner wall surface of said metal mold after said compressing deformation.    
     
     
         92 . The method of manufacturing the magnesium-base composite material according to  claim 91 , wherein said step of extruding and deforming said blended powder is performed by pushing a punch into the compressed blended power body in the metal mold.  
     
     
         93 . The method of manufacturing the magnesium-base composite material according to  claim 92 , wherein a top end portion of said punch has a round shape.  
     
     
         94 . The method of manufacturing the magnesium-base composite material according to  claim 92 , wherein said punch comprises a plurality of push punches.