Process for producing parts with an abrasion-proof surface

A process for producing a part with an abrasion-proof surface involving the following stages:

• a) preparing a cavity mould which has mould walls having the same shape as the abrasion-proof surface to be produced,
• b) introducing particles of a hard material into the mould cavity and vibrating the assembly so that the surface particles come into as close as possible contact with the walls of the mould and are contiguous with each other,
• c) preparing a sufficient quantity of an appropriate alloy in a suitable form to ensure subsequent distribution of the alloy during its later melting phase, the alloy being a soldering alloy capable of wetting the particles of hard material and melting at a temperature which is less than the melting point of the particles of hard material and of the mould,
• d) heating the assembly to a temperature which exceeds the melting point of the alloy but is less than the melting point of the particles of hard material and of the mould,
• e) ensuring the infiltration of the molten alloy into the space filled with particles of hard materials, and
• f) allowing the assembly to cool and stripping the mould,
• wherein the mould has a wall of foundry sand bonded by resins, and wherein the mould has a temperature of degradation which is less than the melting point of the alloy.