Die Entwicklung oxidkeramischer Faserverbundwerkstoffe am Fraunhofer ISC / Zentrum HTL in Zusammenarbeit mit W.E.C. Pritzkow Spezialkeramik: Development of oxide ceramic matrix composites from fraunhofer ISC/Center for high temperature materials and design in cooperation with W.E.C. Pritzkow Spezialkeramik

In the past ten years, the Fraunhofer ISC/center HTL developed together with WEC Pritzkow different generations of special oxide ceramic fiber composites, short O-CMC (oxide ceramic matrics composites). Based on aqueous suspensions of ceramic oxide particles (aluminum and zirconium) with particle sizes in the range of 10-100 nm and 0.1 to 2 microns and fabrics of alumina reinforcing fibers of the type Nextel 610, was the material ceramic sheet® FW12 and FW30 was optimized respect be matrix composition - mixing ratio Al2O3: ZrO2 - and production techniques - laminating, drying, sintering -, so that now a material with excellent properties is available. The mechanical properties are >400 MPa 3-point bending stress at room temperature, an interlaminar shear strength >20 GPa, an elongation of >0.3 % and a damage tolerant fracture behavior. Foundations for this material are a bimodal grain size distribution of the used ceramic powder, a optimal ratio of alumina and zirconia powder, the weak-matrics concept of fiber-reinforced ceramics and a rheological adapted suspensions to the processing technology