Aluminum alloy with preferred mechanical property and preferred electrical and thermal conductivity and related manufacturing method

Abstract

Aluminum alloy with preferred mechanical property and preferred electrical and thermal conductivity is provided by a manufacturing method. The aluminum alloy consists of Si about 0.33˜0.37 wt %, Mg about 0.45˜0.55 wt %, and Fe about 0.07˜0.15 wt %, and the rest weight of the aluminum alloy is Al. A ratio of Mg to a different between Al and one third Fe is ranged between 1.45˜1.75.

What is claimed is: 
     
         1 . An aluminum alloy with preferred mechanical property and preferred electrical and thermal conductivity, comprising:
 Si from 0.33 to 0.37 wt %;   Mg from 0.45 to 0.55 wt %;   Fe from 0.07 to 0.15 wt %; and   Al, wherein the rest weight of the aluminum alloy is made of Al.   
     
     
         2 . The aluminum alloy of  claim 1 , wherein a ratio of Mg to a different between Si and one third Fe is ranged between 1.45 and 1.75. 
     
     
         3 . The aluminum alloy of  claim 1 , further comprising:
 Ga smaller than or equal to 0.03 wt %;   Zn smaller than or equal to 0.03 wt %;   Mn smaller than or equal to 0.01 wt %;   Ti smaller than or equal to 0.01 wt %;   Na smaller than or equal to 0.001 wt %;   Li smaller than or equal to 0.0002 wt %;   a total of Mn, V and Cr smaller than or equal to 0.015 wt %; and   other elements smaller than or equal to 0.01 wt %;   wherein a total of above-mentioned elements is smaller than or equal to 0.1 wt %.   
     
     
         4 . The aluminum alloy of  claim 1 , wherein electrical conductivity of the aluminum alloy is greater than or equal to 34 mS/m, thermal conductivity of the aluminum alloy is greater than or equal to 220 W/m·K, yield strength of the aluminum alloy is greater than or equal to 80 MPa, an elongation rate of the aluminum alloy is greater than or equal to 10%, and hardness of the aluminum alloy is greater than or equal to 40 HBS. 
     
     
         5 . A manufacturing method of an aluminum alloy with preferred mechanical property and preferred electrical and thermal conductivity, comprising:
 melting Al and Si, wherein a weight ratio of Al to Si is preset;   melting Mg with a preset weight into combination of Al and Si; and   mixing and preserving heat of combination of Mg, Al and Si for centrifugal casting execution or high temperature casting execution so as to acquire the aluminum alloy.   
     
     
         6 . The manufacturing method of  claim 5 , further comprising:
 melting the combination of Al and Si with the preset weight ratio at 740770 degrees Celsius.   
     
     
         7 . The manufacturing method of  claim 5 , further comprising:
 detecting and setting Si in a range of 0.33 to 0.37 wt % and Fe in a range of 0.07 to 0.15 wt %.   
     
     
         8 . The manufacturing method of  claim 7 , further comprising:
 detecting and setting Mg in a range of 0.45 to 0.55 wt %; and   detecting and setting a ratio of Mg to a different between Si and one third Fe being ranged between 1.45 and 1.75.   
     
     
         9 . The manufacturing method of  claim 5 , further comprising:
 mixing salt scouring agent into the foresaid combination for deslagger execution; and   aerating inert gas into the foresaid combination for degassing execution.   
     
     
         10 . The manufacturing method of  claim 9 , wherein porosity degree of the aluminum alloy after the degassing execution conforms to Level 2 or higher level of Metallograph of cast aluminum alloys (JB/T7946.3) published as machinery industry standard (People's Republic of China, RPC), or decompression solidification density of the aluminum alloy in a decompression condition is greater than 2.67 g/cm 3 , or a ratio of a difference between atmospheric solidification density and the decompression solidification density to the atmospheric solidification density in an atmospheric condition is smaller than 1.5, or hydrogen content of molten aluminum of the aluminum alloy is smaller than 0.2 ml/100 gAl and liquid permeability of the aluminum alloy is greater than or equal to 500 g/min. 
     
     
         11 . The manufacturing method of  claim 5 , further comprising:
 setting a cooling rate of the aluminum alloy in casting execution ranged between 1˜100 Celsius degrees per second.   
     
     
         12 . The manufacturing method of  claim 5 , further comprising:
 forming a motor rotor by the aluminum alloy; and   setting a temperature of the motor rotor at 200˜350 degrees Celsius in hot installation process, and a thermal insulation period in the hot installation process being set between 15˜60 minutes.