Weight member for a golf club head

Abstract

A weight member for a golf club head is made of a WMoNi alloy by powder metallurgy or a precision casting process. The WMoNi alloy includes tungsten 1-70 wt %, molybdenum 4-55 wt %, and nickel 25-95 wt %. Molybdenum increases the density of the weight member and improves the rust-resisting property of the weight member. The tungsten, molybdenum, and nickel provide a uniform metallographic phase. Uniformity of shining finishing of the weight member is thus improved.

1 . A weight member for a golf club head, the weight member being made by a WMoNi alloy in a precision casting process, the WMoNi alloy comprising a composition of molybdenum 4-55 wt %, nickel 25-95 wt %, and tungsten 1-70 wt %, wherein said weight member comprises of a WMoNi-alloy casting, and the composition of said molybdenum, nickel and tungsten provide a uniform metallographic phase that prevents a surface of the WMoNi-alloy casting from precipitation of tungsten in the precision casting process.  
   
   
       2 - 3 . (Cancelled)  
   
   
       4 . The weight member for a golf club head as claimed in  claim 1 , wherein the WFeNi alloy has a density of 8.6 g/cm 3 -16.6 g/cm 3 .  
   
   
       5 . The weight member for a golf club head as claimed in  claim 1 , further comprising silicon of less than 1.5% to increase flowability during casting.  
   
   
       6 . The weight member for a golf club head as claimed in  claim 1 , comprising at least one component for improving a mechanical property of the weight member.  
   
   
       7 . The weight member for a golf club head as claimed in  claim 6 , wherein said at least one component includes manganese of less than 1.0%, copper of less than 4.0%, vanadium of less than 1.0%, and niobium of less than 1.0%.