Fibrous preform of a friction part

A fibrous preform for forming a fibrous reinforcement of a friction part made of composite material, comprising a woven helical fibrous texture defining a superposition of fibrous layers, said texture being needled and defining:

• a first portion and a second portion each intended to define a distinct rubbing face of the friction part and each comprising at least one fibrous layer comprising ceramic particles, the ceramic particles are discontinuously present on a surface of the fibrous layers of the first and second portions with an alternation along a circumferential direction of the fibrous layers between areas comprising the ceramic particles and areas devoid of ceramic particles at the rubbing faces, fibers of the fibrous layers of the first and second portions being present into the areas devoid of ceramic particles, and
• an intermediate portion between the first portion and the second portion and comprising at least one fibrous layer, said intermediate portion being devoid of ceramic particles,
• wherein the first and second portions each comprise a first fibrous layer having first areas in which the ceramic particles are present, and a second fibrous layer, superimposed on the first fibrous layer, having second areas in which the ceramic particles are present, the second areas not covering the first areas, and wherein the second fibrous layer comprises additional areas devoid of ceramic particles with an alternation along the circumferential direction between the second areas and said additional areas, and
• wherein, in said alternation, the first areas of the first fibrous layer in which the ceramic particles are present are superimposed with the additional areas of the second fibrous layer that are devoid of ceramic particles.