Methods have been developed for softening and removing ceramic rods from a metal casting due to polymorphic transitions in cristobalite and ?-Ca 2 SiO 4 during vibration in water with surfactants without the use of aggressive and environmentally harmful reagents. Cristobalite ceramics had a hot bending strength at 1050 ° C of about 20 MPa, and ?-Ca 2 SiO 4 at 1300 ° C - 18-24 MPa, which is sufficient for its use as a material for rods. The use of a mixture of urea-formaldehyde resin with silica sol for powders from tridymite, mullite and zircon as a binder made it possible to achieve softening of the rods during cooling due to cristobalite polymorphism. The softening of the rods and their removal during vibration in water with surfactants is realized at the polymorphic transition from ?-Ca 2 SiO 4 to ? ??-Ca 2 SiO 4 in masses of MgO, ?-Al 2 O 3 , fused SiO 2 , stabilized with ZrO < sub> 2 .
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