Method of sintering machinable ferrous-based materials
AssigneeBrico Engineering Limited
InventorsCharles G. Purnell, Mohammad S. Mahmoud, Helen A. Brownlie
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Abstract
A method is described for the manufacture of a sintered ferrous-based material having improved machinability, the method comprises the steps of making a mixture of a ferrous-based powder, the mixture including a compound containing at least one metal from the group comprising manganese and the alkaline-earth series of metals; at least one sulphur donating material; pressing the powder mixture and sintering the pressed mixture so as to cause the formation by reaction during sintering of at least one stable metal sulphide within the sintered material. Materials and articles made by the method are also described.
Claims21
A method of enhancing the machinability of a sintered ferrous-based material, the method comprising the steps of (1) making a mixture of a ferrous-based powder, the mixture including (a) a chemical compound of at least one metal selected from the group consisting of manganese and the alkaline-earth series of metals and (b) at least one sulphur donating material;
- (2) pressing the powder mixture and (3) sintering the pressed mixture so as to cause the formation, by a chemical reaction between said chemical compound and said sulphur donating material during sintering of a sulphide of the at least one metal within the sintered material, whereby fine particles of said sulphide of said metal are formed, and uniformly distributed, in said sintered material.
Dependencies are inferred from the claim text.