Sliding element, internal combustion engine and process for obtaining sliding element
AssigneesMahle Metal Leve S/A, Mahle International GmbH
InventorsJuliano Avelar Araujo, Robert R. Banfield
Life of this patent
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Abstract
A sliding element for internal combustion engines may include a ferrous base provided with a film applied upon a sliding surface. The film may have, sequentially, a metal connecting layer, a transitional layer, and a contact layer. The transitional layer may include a carbide containing a metal element. The contact layer may contain DLC (diamond-like carbon) doped with the metal element of the transitional layer, the DLC containing a maximum of 2% hydrogen by weight. An atomic ratio between metal and carbon in the contact layer in terms of a ratio Me/C is equal to or less than 0.1.
Claims20
A sliding element for internal combustion engines, comprising a ferrous base provided with a film applied upon a sliding surface, the film having, sequentially, a metal connecting layer, a transitional layer, and a contact layer, wherein:
- the transitional layer includes a carbide containing a metal element;
- the contact layer contains DLC (diamond-like carbon) doped with the metal element of the transitional layer, the DLC containing a maximum of 2% hydrogen by weight;
- an atomic ratio between metal and carbon in the contact layer in terms of a ratio Me/C is equal to or less than 0.1;
- and
- the connecting layer includes one of chromium, nickel or cobalt having a face centred cubic (fcc) structure.
An internal combustion engine comprising a sliding element having a ferrous base provided with a film applied upon a sliding surface, the film having, sequentially, a metal connecting layer, a transitional layer, and a contact layer, wherein:
- the transitional layer includes a carbide containing a metal element;
- the contact layer contains DLC (diamond-like carbon) doped with the metal element of the transitional layer, the DLC containing a maximum of 2% hydrogen by weight;
- an atomic ratio between metal and carbon in the contact layer in terms of the ratio Me/C is equal to or less than 0.1;
- and
- the connecting layer includes one of chromium, nickel or cobalt having a face centred cubic (fcc) structure.
A process for obtaining a sliding element for internal combustion engines, comprising:
- ion bombarding a ferrous base (2) to clean a surface of the sliding element which will receive a film;
- depositing a metal connecting layer;
- increasing flow of reactive gas to a maximum value such as to form a transitional layer;
- and
- depositing a contact layer under constant process conditions;
- wherein the connecting layer includes one of chromium, nickel or cobalt having a face centred cubic (fcc) structure.
Dependencies are inferred from the claim text.