US2007292301A1PendingUtilityA1

Making Sintered, Iron-Based Alloy Parts By Using Boron-Containing Master Alloys

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Assignee: AMES ALEACIONES DE METALES SINPriority: Apr 2, 2004Filed: Mar 9, 2005Published: Dec 20, 2007
Est. expiryApr 2, 2024(expired)· nominal 20-yr term from priority
Inventors:Francisco FernandezMiren IniguezStephen Mitchell
B22F 2999/00B22F 2003/145B22F 2003/023C22C 33/0207
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Claims

Abstract

A method of making high-density (>7.0 g/ml) sintered iron-based alloy parts by using boron-containing Master Alloys comprises the steps of mixing an atomised, boron-containing master alloy powder, or a plurality of master alloy powders at least one of which is boron-containing, with a conventional iron or iron alloy powder; optionally adding graphite and a lubricant in conventional amounts as used in powder metallurgy technology; and pressing and sintering the mix to an increased density, preferably in a reducing, inert or vacuum atmosphere at 1050 to 1300° C., to produce the part required. The invention also includes parts produced by the above defined method.

Claims

exact text as granted — not AI-modified
1 . A method of making high-density (>7.0 g/ml) sintered, iron-based alloy parts characterised by the steps of: 
 (i) mixing <6% by weight an atomised boron-containing master alloy powder, or a plurality of master alloy powders, at least one of which is boron-containing, with a conventional iron powder or iron alloy powder, said master alloy powder or said plurality of master alloy powders having a mean particle size of 1-30 microns; and    (ii) pressing and sintering the mix to an increased density to produce the part required.    
   
   
       2 . A method as claimed in  claim 1 , wherein before pressing and sintering, graphite is added to the mix in conventional amounts as used in powder metallurgy technology.  
   
   
       3 . A method as claimed in  claim 1 , wherein before pressing and sintering, a lubricant is added to the mix in conventional amounts as used in powder metallurgy technology.  
   
   
       4 . A method as claimed in  claim 3 , wherein said lubricant is a solid.  
   
   
       5 . A method as claimed in  claim 3 , wherein said lubricant is a liquid.  
   
   
       6 . A method as claimed in  claim 3 , wherein said lubricant is a solid dissolved in a liquid.  
   
   
       7 . A method as claimed in  claim 1 , wherein said master alloy powder(s) contains from 1-20% by wt boron.  
   
   
       8 . A method as claimed in  claim 1 , wherein said master alloy powder(s) has a mean particle of under 20 microns.  
   
   
       9 . A method in accordance with  claim 1 , wherein said sintering is effected at temperatures in the range of 1050° C. to 1300° C.  
   
   
       10 . A method as claimed in  claim 9 , wherein said sintering is effected at a temperature below 1200° C.  
   
   
       11 . A method as claimed in  claim 1 , wherein said sintering is effected in a reducing, inert or vacuum atmosphere.  
   
   
       12 . A method in accordance with  claim 1 , wherein said pressing is cold pressing.  
   
   
       13 . A method in accordance with  claim 1 , wherein said pressing is warm pressing at a temperature of <300° C.  
   
   
       14 . A method in accordance with  claim 1 , wherein said part has a pressed density of 6.6-7.4 g/ml.  
   
   
       15 . A high-density sintered iron based part made by the method making high-density (>7.0/ml) sintered, iron-based alloy parts characterised by the steps of: 
 (i) mixing <6% by weight an atomised boron-containing master alloy powder, or a plurality of master alloy powders at least one of which is boron-containing, with a conventional iron powder or iron alloy powder, said master alloy powder or said plurality of master alloy powders having a mean particle size of 1-30 microns; and    (ii) pressing and sintering the mix to an increased density to produce the part required.    
   
   
       16 . A part as claimed in  claim 15 , having a boron content above 0.05% by wt.  
   
   
       17 . A part as claimed in  claim 15 , having a density from 7.2-7.8.  
   
   
       18 . A part as claimed in  claim 15 , having a density of 7.4-7.6 g/ml.

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