A high-strength and water-soluble magnesium sulfate bonded sand core (WSMBS) material cured by twice microwave heating was successfully fabricated using magnesium sulfate aqueous solution as a binder, which is suitable for manufacturing hollow composite structures castings.
Besides, chemical materials cure fast, and curing time is adjustable, therefore, they are frequently used in projects demanding for time or on emergent occasions.
However, PMC materials cured by thermal process require high temperature and are time-consuming.
Nylon fiber, a proprietary product of Nycon fibers Inc. (NYMAX), was used in an effort to prevent cracks that occur due to shrinkage while cement matrix materials cured.
Materials cured at room temperature were tougher and had lower rubbery moduli than those cured at 140 °C.
The properties of obtained material were referred to those of materials cured in water at a temperature of 20 °C.
Mechanical properties of dimethacrylate styrene networks were determined for materials cured at room temperature and at 140 °C.
The time-temperature-power relationships are linear for normal, non-rapid setting repair materials cured within the recommended temperature range taking account of temperature variation and heat of hydration.
Ionic liquids based on imidazolium, pyridinium and phosphonium with long alkyl chain were used to develop epoxy networked materials cured at high temperature, with 4,4′-methylene-bis 3-chloro-2,6-diethylaniline (MCDEA).
Neat epoxy materials cured with imidazolium IL exhibited above 45 days latency, high thermal performance, i.e. glass transition temperature (above 190 °C), low tan δ (0.17), and stability (395 °C/5% weight loss), whereas with phosphonium IL – pot life above 70 days, similar tan δ value and high transparency (85%).
