NEW COMPOSITE ceramic matrix based on silicon carbide is able to resist the crack propagation
French company Sos#39;ete Nas#39;onal #39;D#39;ehtjud Eh De Konstrjuks#39;on De Moter D#39;avias#39;on (SNEKMA) has developed a new composite material is a ceramic matrix having improved properties, in which the protection against the penetration of cracks to interphase layer between fibers and the matrix is more effective than all existing materials.
Such composite materials with a ceramic matrix are used in various fields, such as in aircraft and aerospace, where necessary Thermostructural their properties, providing the ability to form structures during thermal exposure. That is, when they are required ability to form structural elements because the mechanical strength, in particular due to the flexural strength, tensile and impact strength that is significantly higher than the strength of products made entirely of ceramic, and also its ability to maintain the mechanical properties at high temperatures, which can reach 1500 | C or higher temperatures.
A new composite material based on technology from the company Sos#39;ete Nas#39;onal #39;D#39;ehtjud Eh De Konstrjuks#39;on De Moter D#39;avias#39;on (SNEKMA) researchers: Guzharom Stephen, Cayo Alain, Bertrand Sebastian, Rene Payet and Jean Charvet -Luc contains the fibrous strengthening member is made of fibers composed mainly of silicon carbide (SiC), and an interphase layer between the fibers of the reinforcement and a ceramic matrix.
The fibers of the reinforcement are long fibers containing less than 5 at.% Residual oxygen and have a modulus of 250 GPa, and the interphase layer is firmly connected to the fibers and the matrix so that the tensile strength at a cut within the interphase layer and at the level of the links fibers with an interfacial layer and the interfacial layer with the matrix values would be above the set within the matrix.
The characteristics of the new material are available in the interphase layer, which may provide communication with the fiber and matrix in the choice of fibers which can ensure the preservation and maintenance of a strong bond with the interfacial layer.
