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US 7,459,110 B2Granted
Porous fiber-ceramic composite
AssigneeCeramTec GmbH
InventorsIlka Lenke, Dirk Rogowski, Dieter Theil
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AssigneeCeramTec GmbH
InventorsIlka Lenke, Dirk Rogowski, Dieter Theil
Estimating the term…
Both ceramic and intermetallic materials as a rule have a very small elongation at break of distinctly less than 0.3% and therefore a break behaviour with low damage tolerance. In order to increase the damage tolerance, it is important to increase the elongation at break to at least 0.3% or more. This can be achieved by introducing, for example, fibres consisting of carbon or ceramic or metal fibres into the matrix. It is important in this respect for the distribution of the fibres in the matrix to be homogeneous and/or defined. It is of advantage and therefore as a rule desirable for the fibres for reinforcing a material or component to be oriented in a defined direction which is adapted to the main stress. Therefore, according to the invention, a fibre-ceramic composite is proposed which consists of a ceramic matrix with a pore proportion of 0% to 75% and a fibre proportion of 5% by volume to 30% by volume, wherein the distribution of the fibres in the matrix is homogeneous and/or defined, and their quantity and orientation are optimized in relation to the material load.
A process for the manufacture of a rough body or component from a fiber-ceramic composite material with a composition comprising a ceramic matrix that is from 30 to 75% porous and contains a quantity of from 5 to 30% by volume of fibers, wherein the distribution of the fibers in the matrix is at least one of homogeneous or defined, and wherein the quantity and orientation of the fibers are optimized in relation to a material load by pressing in a mold, comprising putting the fibers and the material forming the ceramic matrix into a mold so that the fibers have at least one of a homogenous or defined distribution in the matrix, and adding the fibers to optimize the quantity and alignment of the fibers with respect to an anticipated stress on the fiber-ceramic composite material, and wherein the fibers retain a preset alignment.
Dependencies are inferred from the claim text.