What does VIC mean in UNCLASSIFIED

Vapor Injection Cure (VIC) is a composite curing technique that utilizes vapor injection to promote the cross-linking and hardening of composite materials, typically in high-pressure autoclave environments.

VIC involves injecting a volatile curing agent into a closed mold containing the composite material. The vaporized agent permeates the composite layup, initiating a chemical reaction that leads to cross-linking and cure. This process occurs under elevated temperature and pressure, facilitating the complete and uniform curing of the composite.

VIC offers several advantages over traditional curing methods:

• Enhanced cure uniformity: VIC ensures consistent curing throughout the composite structure, eliminating the risk of uncured or partially cured areas.
• Reduced voids and defects: The vapor injection process minimizes voids and defects within the composite, contributing to improved mechanical properties.
• Faster cure times: VIC typically results in shorter cure times compared to traditional methods, leading to increased production efficiency.
• Reduced energy consumption: The use of vapor allows for curing at lower temperatures and pressures, reducing energy consumption.

VIC is commonly used to cure thermosetting composites, including epoxy, phenolic, and cyanate ester resins.

VIC may not be suitable for certain composite structures or geometries due to:

• Limited penetration: The vapor injection process may struggle to reach deep or enclosed areas within the composite.
• Environmental concerns: The use of volatile curing agents may require careful consideration of environmental regulations and emissions control.

The use of vaporized curing agents requires appropriate safety precautions, including proper ventilation, personal protective equipment, and handling protocols to minimize exposure and potential health hazards.