Molten metal supply device and aluminum titanate ceramic member having improved non-wettability

Abstract

An electromagnetic type molten metal supply device having superior accuracy in supplying molten metal. This device is comprised of a rotary vane that rotates in accordance with the movement of molten metal inside a molten metal transport conduit, and the amount of molten metal being transported can be measured by detecting the rotational frequency of the rotary vane.

1 . A molten aluminum alloy supply device comprising: 
 an electromagnetic pump and    a molten metal transport conduit provided with said electromagnetic pump,    wherein the transport conduit compises aluminum titanate ceramic base material and has in at least a part that come into contact with the molten aluminum alloy a layer which Si content is less than that in said aluminum titanate ceramic base material.    
     
     
         2 . A supply device as in  claim 1 , 
 wherein said layer contains one or more components selected from the group consisting of Al 2 O 3 , MgO and MgAl 2 O 4 .    
     
     
         3 . A supply device as in  claim 1 , 
 wherein said Si content of the layer is equal to or less than 3 wt %.    
     
     
         4 . A supply device as in  claim 1 , 
 wherein said aluminum titanate ceramic base material contains α-Al2O3.    
     
     
         5 . A supply device as in  claim 1  comprising: 
 a rotary vane that is provided inside the transport conduit and which rotates in accordance with the movement of the molten aluminum alloy and    a detector that detects the rotational frequency of the rotary vane.    
     
     
         6 . A supply device as in  claim 5 , 
 wherein said rotary vane has a shaft and blades arranged on the shaft;    the shaft is mounted in the transport conduit via a cap member having a convex portion that is fitted into a tapered fitting hole provided in the said transport conduit and a throughhole that passes through the convex portion and in which the shaft can be fitted.    
     
     
         7 . A supply device as in  claim 6 , 
 wherein said cap member is pressure-fitted in said transport conduit by means of securing member.    
     
     
         8 . A supply device as in  claim 7 , 
 wherein the tensile force sufficient to compensate for the thermal expansion of said securing member is applied to the said securing member.    
     
     
         9 . A supply device as in  claim 1 , 
 wherein said transport conduit has a device detecting the volume of the molten aluminum alloy inside the transport conduit.    
     
     
         10 . A supply device as in  claim 5 , 
 wherein said rotary vane compises aluminum titanate ceramic base material and has in at least a part that come into contact with the molten aluminum alloy a layer which Si content is less than that in said aluminum titanate ceramic base material.    
     
     
         11 . A casting device comprising a molten aluminum alloy supply devise as in  claim 1 .  
     
     
         12 . A molten aluminum alloy contact member, 
 the contact member comprising aluminum titanate ceramic base material and having in at least a part that comes into contact with the molten aluminum alloy a layer which Si content is less than that in said aluminum titanate ceramic base material.    
     
     
         13 . A contact member as in  claim 12 , 
 wherein said layer contains one or more components selected from the group consisting of Al 2 O 3 , MgO and MgAl 2 O 4 .    
     
     
         14 . A contact member as in  claim 12 , 
 wherein said layer contains Al 2 TiO 5 .    
     
     
         15 . A contact member as in  claim 12 , 
 wherein said Si content of the layer is equal to or less than 3 wt %.    
     
     
         16 . A contact member as in  claim 12 , 
 wherein said contact member comprises one or more members selected from the group consisting of ladle, transport conduit and mixing device.    
     
     
         17 . A casting device comprising on or more molten aluminum titanate alloy contact member as in  claim 12 .  
     
     
         18 . A method of manufacturing aluminum alloy cast, 
 using the molten aluminum alloy contact member as in  claim 12 .    
     
     
         19 . A method of manufacturing a molten aluminum alloy contact member comprising steps: 
 preparing a contact member comprising aluminum titanate ceramic base material having in at least a part of the contact member a layer containing one or more components selected from the group consisting of Al 2 O 3 , MgO and Al 2 TiO 5 , wherein the Si content of the layer is less than that in the aluminum titanate ceramic base material; and    synthesizing MgAl 2 O 4  in the layer by causing magnesium and/or aluminum to act upon the layer.    
     
     
         20 . A method of manufacturing a molten aluminum alloy contact member comprising steps: 
 preparing a contact member comprising aluminum titanate ceramic base material having in at least a part of the contact member a layer containing one or more components selected from the group consisting of Al 2 O 3 , MgO and Al 2 TiO 5 , wherein the Si content of the layer is less than that in the aluminum titanate ceramic base material; and    contacting the layer of the contact member to a molten aluminum alloy containing magnesium in at least a part of molten aluminum alloy casting process and thereby synthesizing MgAl 2 O 4  in the layer.    
     
     
         21 . A method of manufacturing an aluminium alloy cast comprising steps: 
 preparing a contact member comprising aluminum titanate ceramic base material having in at least a part of the contact member a layer containing one or more components selected from the group consisting of Al 2 O 3 , MgO and Al 2 TiO 5 , wherein the Si content of the layer is less than that in the aluminum titanate ceramic base material; and    contacting the layer of the contact member to a molten aluminum alloy containing magnesium in at least a part of molten aluminum alloy casting process and thereby synthesizing MgAl 2 O 4  in the layer.