131 SiC繊維強化SiO-mulliteマトリックス複合材料の作製と機械的特性(OS 複合材料CMC及びMMC)

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It is known that the CFCCs (continuous-fiber-reinforced ceramic matrix composites) are characterized by their non-linear fracture behavior, which is hardly found in monolithic ceramic materials. In order to develop materials for high temperature services, a sintered SiC (Tyrano-SA) fiber-reinforced oxide matrix composites were fabricated by using a slurry infiltration method and hot-pressing. In our previous work, the SiC/Alumina-YAG matrix composite was fabricated, which showed 760 MPa of bending strength at 1573 K and 260 MPa at 1873 K. In spite of excellent high temperature strength, this composite had the transverse crack due to the thermal residual stress after the hot-pressing. To prevent the fiber or coating layer, such as CVD-graphite or h-BN layer, from the oxidization, it is desirable that the fiber is surrounded by a oxide material without matrix crack. Thus, as the alternative matrix, SiO2-mullite double phase matrix was selected. The CTE of the fiber is about 4.5 ppm. On the other hand, the CTE of the matrix is controllable between the CTE of SiO2 glass (〜0.5ppm) and mullite (〜6ppm) by the volume fraction of the mullite in the glass phase. As the results, the SiC reinforced/SiO2-8.8, 77 and 86 Vf.% mullite matrix composites were fabricated with the 1 mm thick of CVD-graphite coating on the fiber. No matrix crack was found regardless of the mullite volume fraction. The thermal residual strength was estimated by FEM analysis and the fiber push-out test. It is confirmed that the fiber cramping strength increases with an increasing in the Vf. of primary mullite from 22 MPa to 36 MPa. The highest quasi-static fracture energy (57,000 J/m2) and bending strength (1260 MPa) were obtained at R.T. when the Vf. of the mullite was 8.8%. Thus relatively weak cramping strength will be preferable to enhanced the pull-out of the fiber during the fracture process, besides the weak interfacial bonding. Furthermore, in order to investigate near net-shape processing of CFCCs, infiltration of MAS glass into a 3D-formed SiC fiber preform was carried out by using HIP. Well condensed SiC/MAS glass composite was obtained without defects.
社団法人日本機械学会の論文
2001-11-02

131 SiC繊維強化SiO-mulliteマトリックス複合材料の作製と機械的特性(OS 複合材料CMC及びMMC)

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