Abstract
The incorporation of polypropylene fibre, aluminium silicate fibre and glass fibre in a water-based silica binder in an investment casting shell was investigated in this work. The green strength, fired strength and retained strength of the shell were investigated. The fracture surfaces were observed by scanning electron microscopy (SEM). The components of the shell were analysed by X-ray diffraction (XRD). The mechanism of the fibre-reinforced shell for investments was discussed. The maximum green strength of 4.19 MPa was obtained in the shell with glass fibre. The fired strength of shell reinforced with aluminium silicate fibre is higher than that of the others. However, the shell reinforced with polypropylene fibre exhibits the lowest retained strength of 4.39 MPa. Based on the observation of the fracture surfaces using SEM and the results of XRD, the action mechanism is given in this paper.
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