Easily removed ceramic rods for casting gas-turbine engine blades using molding patternsстатья

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Дата последнего поиска статьи во внешних источниках: 26 марта 2018 г.

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[1] Easily removed ceramic rods for casting gas-turbine engine blades using molding patterns / A. V. Belyakov, I. V. Razumnova, I. M. Demonis, Y. I. Folomeikin // Glass and Ceramics. — 2012. — Vol. 69, no. 3-4. — P. 125–129. Methods have been developed for weakening and removing ceramic rods from a metal casting by means of polymorphic transformations in cristobalite and β-Ca2SiO4 during vibration in water containing surfactants without the use of aggressive and environmentally harmful reagents. The hot-bending strength (at 1050oC) of ceramic made from cristobalite was about 20 MPa while that of β-Ca2SiO4 at 1300oC was 18 – 24 MPa, which is adequate for use as a rod material. The use of carbamide formaldehyde resin with silicate sol as a binder for powders made from tridimite, mullite and zircon made it possible to weaken the rods, on cooling, as a result of polymorphism of cristobalite. The weakening and removal of the rods during vibration in water containing a surfactant was achieved with a polymorphic transformation from β-Ca2SiO4 into -Ca2SiO4 in mixes made from MgO, -Аl2O3, fused SiO2 and stabilized ZrO2. [ DOI ]

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