Effect of in situ synthesised mullite whiskers on the high-temperature strength of Al2O3-based ceramic moulds for casting hollow turbine blades
Source abstract
Abstract
Abstract In situ synthesised mullite whiskers were used to improve the high-temperature strength of Al 2 O 3 -based ceramic moulds for casting hollow turbine blades fabricated by the geSlcasting method using Al 2 O 3 , SiO 2 and AlF 3 ·3H 2 O as the raw materials. The microstructures and phase compositions of the sintered ceramic samples were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The bending strengths of the samples were tested at 1500 °C. Mullite whiskers with diameters of 0.5–0.6 µm and lengths of 4–8 µm were synthesised in the Al 2 O 3 -based ceramic moulds. These whiskers acted as bridges between the pore walls of the ceramic moulds, enhancing the strength of the ceramic moulds. The bending strength of the ceramic mould at 1500 °C increased from 8.3 to 16.9 MPa when 10 vol% AlF 3 ·3H 2 O and 12 vol% SiO 2 were added.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Recycling and utilization of industrial and municipal waste in materials production
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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