Wear resistant articles
AssigneeDunlop Aerospace Limited
InventorDavid Callum Johnson
Life of this patent
Estimating the term…
Abstract
An annular body, and method of making same, comprising at least one wear surface portion, the portion comprising a plurality of layers held in a matrix, each layer consisting essentially of fibres which extend generally in one direction and parallel to each other and from the centre of the body to the periphery, whereby the wear of that surface portion is improved. The body can be formed into an aircraft brake disc.
Claims16
An annular body having opposite faces an a generally circular aperture, the body comprising a plurality of layers held in a carbon matrix, the layers of the body being made up of segmental portions arranged in general side-by-side abutting relations, wherein each segmental portion has a plurality of fibers radially disposed which only extend in generally parallel relation from an inner edge to an outer edge thereof.
A method of forming an annular body comprising a plurality of layers held in a carbon matrix, the method comprising:
- forming a sheet consisting essentially of longitudinally extending generally parallel long fibres;
- carbonising fibres in the sheet to form a carbonised sheet;
- cutting from the carbonised sheet segmental portions having an outer curved edge and an inner curved edge, and in which the fibres lie generally parallel to each other and extend only from the inner edge to the outer edge;
- arranging the segmental portions in a circular array to form an annular layer whereby the fibers extend radially;
- building up a plurality of the layers to form a preform;
- and
- densifying the preform by introducing carbon containing vapour to form the carbon matrix.
A method of forming an aircraft brake disc comprising:
- forming a sheet consisting of longitudinally extending generally parallel long fibres and relatively short lengths of fibre, the parallel fibres being connected by means of said relatively short lengths of fibre;
- carbonising fibres in the sheet to form a carbonised sheet;
- cutting from the carbonised sheet segmental portions having an outer curved edge and an inner curved edge, and in which the long fibres lie generally parallel to each other and extend only from the inner edge to the outer edge;
- arranging the segmental portions in successive abutting relation such that the portions describe a helical structure whereby the fibers extend radially;
- compressing axially the so-formed helical structure;
- and
- densifying the compressed helical structure by introducing carbon containing vapour to form a carbon matrix.
Dependencies are inferred from the claim text.