Metal Leve S/a Industria E Comercio

Metal Leve S.a.

Ademir Carubelli

Duraid Mahrus

A method of making a plain bearing sliding layer for use in internal combustion engines, comprising the immersion of a metal substrate in a chemical solution containing copper, tin and lead salts to which is added one of the compounds represented by the following three exemplary structures: ##STR1## where X is one of the chemical elements selected from sulphur and nitrogen, --C represents one carbon atom, and radicals R.sub.1 and R.sub.2 represent the allowed variations, from a single hydrogen atom up to the typical structures of inorganic compounds or aliphatic, aromatic or cyclic chain organic radicals. The chemical solution is subjected to an electric current with a density and potential controlled as a function of time, thereby effecting the selective electrodeposition of the solution elements on the substrate so as to form successive and alternate layers of softer material and harder material. Each of the layers of softer metal is a Cu-Sn-Pb alloy layer and each of the layers of harder material is a pure copper or a Cu-Su alloy layer.

Method of making a plain bearing sliding layer

A multilayer plain bearing composed of a backing layer, an intermediate layer and a diffusion or bonding layer, and a sliding layer, the sliding layer being of a laminate structure formed by the alternate deposition of layers of a softer material and layers of a harder material.

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Sao Paulo, Brazil

Ademir Carubelli