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How are technical porcelains used as electrical insulators?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
Stages in the slip casting of a thin-walled whiteware container. Clay powder is mixed in water together with a dispersing agent, which keeps the clay particles suspended evenly throughout the clay-water slurry, or slip. The slip is poured into a plaster mold, where water is drawn out by capillary action and a cast is formed by the deposition of clay particles on the inner surfaces of the mold. The remaining slip is drained, and the cast is allowed to dry partially before the drain hole is plugged and the mold separated. The unfinished ware is given a final drying in an oven before it is fired into a finished product.
traditional ceramics Stages in the slip casting of a thin-walled whiteware container. Clay powder is mixed in water together with a dispersing agent, which keeps the clay particles suspended evenly throughout the clay-water slurry, or slip. The slip is poured into a plaster mold, where water is drawn out by capillary action and a cast is formed by the deposition of clay particles on the inner surfaces of the mold. The remaining slip is drained, and the cast is allowed to dry partially before the drain hole is plugged and the mold separated. The unfinished ware is given a final drying in an oven before it is fired into a finished product.

Technical porcelains are a class of vitreous, nonporous whiteware ceramics valued for their ability to function as excellent electrical insulators. Their utility in this role is derived from their specific material composition and manufacturing process, which ensure they are impervious to fluids and chemically inert, even in corrosive environments.1

As insulators, these ceramics are designed to resist the flow of electric current, a property inherent to most traditional ceramic materials. Because they are vitreous and nonporous, they maintain structural integrity and high electrical resistance, preventing the leakage of current. Common applications for these insulating properties include:2

  • Spark-plug insulators: Used in automobile engines to withstand high temperatures and electrical stress.1
  • General electric insulators: Utilized in various systems to prevent unwanted electrical conductivity.12

The manufacturing process for technical porcelains, which typically involves pressing and firing at high temperatures (1,250 to 1,300 Β°C), creates a dense, fine microstructure that supports these insulating characteristics. While some advanced ceramics are engineered to be conductive, technical porcelains remain a standard choice for applications requiring reliable electrical isolation.123