Composite metal articles
AssigneeBrico Engineering Limited
InventorTerence M. Cadle
Life of this patent
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Abstract
A metal article is formed by a sintered body of an austenitic ferrous alloy containing chromium and nickel, the ferrous alloy having been infiltrated with a copper or copper base alloy during or after sintering of the body. When a body of aluminum or aluminum alloy is cast around the metal article, a good bond therebetween is achieved. The metal article can thus provide a wear-resistant insert, for example a piston ring carrier in an aluminum piston or a valve seat in an aluminum cylinder head for an automobile.
Claims24
A metal article comprising
- a body of aluminum or aluminum alloy,
- an insert in said body for increasing the load-bearing or wear-resistance capacity of the article,
- the insert comprising a sintered body of an austenitic ferrous alloy containing chromium and nickel,
- the ferrous alloy having been infiltrated with copper or copper-base alloy during or after sintering of the body, and
- the body having been cast around the insert, the insert having been thereby bonded to the body over substantially the whole of its surface which is in contact with the body.
A metal article in the form of a piston for an internal combustion engine,
- the piston comprising a body of aluminum or aluminum alloy and a piston ring carrier around which the body has been cast,
- the carrier comprising a sintered body of an austenitic ferrous alloy containing chromium and nickel,
- the ferrous alloy having been infiltrated with copper or copper-base alloy during or after sintering of the body.
A method of manufacture of an aluminum or aluminum alloy article incorporating a ferrous alloy insert comprising the steps of
- compacting and sintering a powder to form a sintered body of an austenitic ferrous alloy containing chromium and nickel,
- infiltrating the ferrous alloy either simultaneously or in a subsequent step with copper or copper base alloy, and
- casting the aluminum or aluminum alloy around the insert.
Dependencies are inferred from the claim text.